OSS-101 - Rules for Classification of Offshore Drilling Units

OFFSHORE SERVICE SPECIFICATION

DET NORSKE VERITAS

DNV-OSS-101

RULES FOR CLASSIFICATION OF OFFSHORE DRILLING AND SUPPORT

UNITS

APRIL 2002

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FOREWORD

DET NORSKE VERITAS (DNV) is an autonomous and independent foundation with the objectives of safeguarding life, prop-erty and the environment, at sea and onshore. DNV undertakes classification, certification, and other verification and consultancyservices relating to quality of ships, offshore units and installations, and onshore industries worldwide, and carries out researchin relation to these functions.

DNV Offshore Codes consist of a three level hierarchy of documents:

— Offshore Service Specifications. Provide principles and procedures of DNV classification, certification, verification and con-sultancy services.

— Offshore Standards. Provide technical provisions and acceptance criteria for general use by the offshore industry as well asthe technical basis for DNV offshore services.

— Recommended Practices. Provide proven technology and sound engineering practice as well as guidance for the higher levelOffshore Service Specifications and Offshore Standards.

DNV Offshore Codes are offered within the following areas:

A) Qualification, Quality and Safety Methodology

B) Materials Technology

C) Structures

D) Systems

E) Special Facilities

F) Pipelines and Risers

G) Asset Operation

DET NORSKE VERITAS

Offshore Service Specification DNV-OSS-101, April 2002Changes –

CHANGES IN THE RULES

The present edition of the rules includes amendments and ad-ditions decided by the Board in December 2001 and super-sedes the January 2001 edition.

The changes come into force 1 July 2002.

These rules are valid until superseded by a revised version.Possible amendments between reprints will be published inDNV Offshore Codes Amendments and Corrections availableat http://www.dnv.com. Amendments and Corrections is nor-mally revised in April and October each year. When reprinted,revised rules will be forwarded to all subscribers to the rules.

Main changes

CHAPTER 1 PRINCIPLES AND PROCEDURES FORCLASSIFICATION

• Sec.1 Introduction

— Previous item B226 has been deleted as Sec.4 A1200 cov-ers the content. Subsequent items have been renumberedaccordingly.

• Sec.2 Classification Principles

— Item A304 has been slightly reformulated.— Item A306 has been added regarding decisions made by

national authorities as basis for class.— New item A605 concerning disclosure of information has

been added.

• Sec.4 Classification Procedure

— A new item A1800 has been added concerning DNV'sright to decline an application for classification.

— The last bullet point in B101 has been expanded regardingthe responsibility to pay fees due to DNV.

— All items in B800 have been rewritten for clarification andconsistency and to better fulfil requirements for transpar-ency.

— A new item D104 has been added regarding DNV's rightto suspend or withdraw class on more than one vessel be-ing controlled by the same owner.

— A new item D305 has been added regarding DNV's rightto withdraw class in case of the owner's bankruptcy. Exist-ing D305 has been renumbered D306.

— Item D401 has been amended regarding the conditions forreclassification.

CHAPTER 3 CLASSIFICATION IN OPERATION

• Sec.1 General Provisions for Periodical Surveys

— A new item A105 has been added regarding In-service In-spection Programs and their formal status.

• Sec.2 Periodical Survey Extent for Main Class

— A new item D217 on survey of major appurtenances hasbeen added.

— A new item D303 stating references to OS requirementsfor fatigue safety factors and corrosion protection has beenadded.

APPENDIX A INTRODUCTION TO OFFSHORE CLASSIFICATION

— A new appendix has been introduced based on the Rulesfor Classification of Ship Pt.0 Ch.2.

Corrections and Clarifications

In addition to the above mentioned rule changes, some detect-ed errors have been corrected and some clarifications havebeen made to the existing rule wording.

DET NORSKE VERITAS

Offshore Service Specification DNV-OSS-101, April 2002 – Changes

DET NORSKE VERITAS

Offshore Service Specification DNV-OSS-101, April 2002 Contents –

CONTENTS

CH. 1 PRINCIPLES AND PROCEDURES FOR CLAS-SIFICATION......................................................... 9

Sec. 1 Introduction......................................................... 11

A. Introduction ..........................................................................11A 100 General............................................................................11A 200 Organisation of DNV-OSS-101......................................11A 300 Objects covered...............................................................11

B. Definitions ............................................................................ 11B 100 Verbal forms ...................................................................11B 200 Definitions ......................................................................11

C. Normative References ..........................................................12C 100 Normative references......................................................12C 200 DNV reference documents..............................................12C 300 Other references.............................................................. 12

D. Informative References.........................................................12D 100 DNV informative references...........................................12D 200 Other references.............................................................. 12

E. Abbreviations........................................................................ 12E 100 General............................................................................12

Sec. 2 Classification Principles ..................................... 14

A. The Classification Concept...................................................14A 100 Introduction.....................................................................14A 200 Entering into force and application of rules....................14A 300 Basis for assignment of class ..........................................14A 400 Basis for maintenance of class........................................ 14A 500 Documentation................................................................14A 600 Disclosure of information ...............................................14A 700 Limitation of DNV's responsibility ................................15A 800 Vertical contract audits and audits by national maritime

authorities........................................................................15

Sec. 3 Classification Scope and Notations ................... 16

A. Scope of Classification .........................................................16A 100 General............................................................................16A 200 Rule parts ........................................................................16A 300 Rule particulars ...............................................................16

B. Class Notations .....................................................................16B 100 General............................................................................16B 200 Construction symbols .....................................................16B 300 Main character of class ................................................... 16B 400 Basic design notations ....................................................16B 500 Service notations.............................................................16B 600 System and special facility notations..............................17B 700 Special feature notations.................................................17B 800 Service restrictions..........................................................17B 900 Compliance with shelf state legislation .......................... 17B 1000 Combination of notations ...............................................18

Sec. 4 Classification Procedure .................................... 19

A. Assignment of Class .............................................................19A 100 Request for classification................................................19A 200 Requirements for workshops and yards.......................... 19A 300 Information about subcontractors and suppliers of

products...........................................................................19A 400 Requirements for manufacturers.....................................19A 500 Requirements for suppliers of services...........................19A 600 Requirements for calibration of equipment ....................19A 700 Document approval.........................................................19A 800 Survey .............................................................................19A 900 Functional testing............................................................20A 1000 Certification of materials, components and systems ......20A 1100 Manufacturing survey arrangement ................................21A 1200 Type approval .................................................................21A 1300 Acceptance of control by national authorities ................21A 1400 Certificate of interim class..............................................21

A 1500 Classification certificate ................................................. 21A 1600 Appendix to the classification certificate ....................... 21A 1700 Entry in the “Register of vessels classed by DNV”........ 21A 1800 Decline of application for classification ......................... 21

B. Retention of Class.................................................................22B 100 General............................................................................ 22B 200 Periodical and renewal surveys ...................................... 22B 300 Survey of damage ........................................................... 22B 400 Repairs ............................................................................ 22B 500 Procedures for maintenance............................................ 22B 600 Conversions and alterations............................................ 22B 700 Change of ownership ...................................................... 23B 800 Conditions of class and memoranda ............................... 23B 900 Survey reports and survey status .................................... 23

C. Validity and Issuance of the Classification Certificate.........23C 100 Validity of the certificate ................................................ 23C 200 Issuance of certificate ..................................................... 23

D. Suspension and Withdrawal of Class ...................................23D 100 General............................................................................ 23D 200 Suspension of class ......................................................... 23D 300 Withdrawal of class ........................................................ 24D 400 Reclassification............................................................... 24

E. Appeals .................................................................................24E 100 Decisions taken by DNV ................................................ 24

Sec. 5 Legal Provisions.................................................. 25

A. Liability and Jurisdiction ......................................................25A 100 Limited liability .............................................................. 25A 200 Governing law ................................................................ 25A 300 Venue.............................................................................. 25

CH. 2 DESIGN AND CONSTRUCTION PROVISIONS 27

Sec. 1 Design and Construction Requirements for 1A1 MOU Main Class ................................................. 29

A. General..................................................................................29A 100 Introduction..................................................................... 29A 200 Technical reference documents ...................................... 29A 300 General assumptions ....................................................... 29A 400 Documentation................................................................ 29

B. Safety Principles and Arrangement ......................................29B 100 General............................................................................ 29B 200 Design principles ............................................................ 29B 300 Arrangement ................................................................... 29B 400 Escape and evacuation.................................................... 29B 500 Documentation requirements.......................................... 29

C. Materials ...............................................................................29C 100 Technical requirements................................................... 29C 200 Supplementary classification requirements .................... 30

D. Structural Design ..................................................................30D 100 Technical requirements................................................... 30D 200 Documentation requirements.......................................... 30

E. Fabrication and Testing of Offshore Structures....................30E 100 Technical requirements................................................... 30E 200 Documentation requirements.......................................... 30E 300 Supplementary classification requirements .................... 30

F. Stability and Watertight/Weathertight Integrity ...................30F 100 Technical requirements................................................... 30F 200 Documentation requirements.......................................... 30

G. Mooring and Towing ............................................................30G 100 General............................................................................ 30G 200 Ship-shaped units............................................................ 30G 300 Column-stabilised units .................................................. 30

DET NORSKE VERITAS

Offshore Service Specification DNV-OSS-101, April 2002 – Contents

G 400 Self-elevating units .........................................................30G 500 Towing ............................................................................30G 600 Documentation requirements ..........................................30G 700 Supplementary classification requirements ....................31

H. Marine and Machinery Systems and Equipment.................. 31H 100 Technical requirements ...................................................31H 200 Documentation requirements ..........................................31H 300 Supplementary classification requirements ....................31

I. Electrical Systems and Equipment ....................................... 31I 100 Technical requirements ...................................................31I 200 Documentation requirements ..........................................31I 300 Supplementary classification requirements ....................31

J. Instrumentation and Telecommunication Systems............... 31J 100 Technical requirements ...................................................31J 200 Documentation requirements ..........................................31J 300 Supplementary classification requirements ....................31

K. Fire Protection ...................................................................... 31K 100 Technical requirements ...................................................31K 200 Documentation requirements ..........................................32K 300 Supplementary classification requirements ....................32

L. Summary of Technical Reference Standards........................ 32L 100 General ............................................................................32

Sec. 2 Supplementary Requirements for Service Notation Drilling Unit ........................................ 33

A. General.................................................................................. 33A 100 Introduction.....................................................................33

B. Safety Principles and Arrangement ...................................... 33B 100 General ............................................................................33B 200 Arrangement ...................................................................33B 300 Area classification...........................................................33B 400 Emergency shutdown......................................................33B 500 Escape, evacuation and communication .........................33B 600 Supplementary documentation requirements..................33

C. Structural Design .................................................................. 33C 100 General ............................................................................33C 200 Supplementary documentation requirements..................33

D. Instrumentation and Telecommunication Systems............... 33D 100 Supplementary documentation requirements..................33

E. Fire Protection ...................................................................... 33E 100 General ............................................................................33E 200 Supplementary technical requirements ...........................33E 300 Supplementary documentation requirements..................33

F. Summary of Requirements ................................................... 33F 100 Documentation requirements ..........................................33F 200 Technical reference standards .........................................33

Sec. 3 Supplementary Requirements for Service Notation Well Intervention Unit...................... 35

A. General.................................................................................. 35A 100 Introduction.....................................................................35

B. Requirements for Well Intervention Unit – I................... 35B 100 Equipment .......................................................................35B 200 Dynamic positioning system...........................................35

C. Requirements for Well Intervention Unit – II.................. 35C 100 General ............................................................................35C 200 Area classification...........................................................35C 300 Emergency shutdown......................................................35C 400 Escape, evacuation and communication .........................35C 500 Supplementary documentation requirements..................35

D. Fire Protection ...................................................................... 35D 100 General ............................................................................35D 200 Supplementary technical requirements ...........................35D 300 Supplementary documentation requirements..................35D 400 Supplementary classification requirements ....................35D 500 Well intervention systems and equipment ......................36

D 600 Dynamic positioning system...........................................36

Sec. 4 Supplementary Requirements for Service Notation Accommodation Unit ...................... 37

A. General..................................................................................37A 100 Introduction.....................................................................37

B. Safety Principles and Arrangement ......................................37B 100 Arrangement of emergency power..................................37

C. Structural Strength ................................................................37C 100 General ............................................................................37C 200 Design loads....................................................................37C 300 Containerised modules....................................................37C 400 Gangways........................................................................37

D. Stability and Watertight Integrity .........................................37D 100 General ............................................................................37

E. Electrical Systems and Equipment .......................................37E 100 Emergency source of power and emergency installation37

F. Mooring ................................................................................37F 100 General ............................................................................37F 200 Documentation and technical requirements....................38

Sec. 5 Supplementary Requirements for Service Notation Crane Unit .......................................... 39

A. Introduction...........................................................................39A 100 Objective .........................................................................39A 200 Documentation requirements ..........................................39

B. Structural Design ..................................................................39B 100 General ............................................................................39B 200 Technical requirements ...................................................39

C. Stability and Watertight Integrity .........................................39C 100 Technical requirements ...................................................39

D. Certification of Materials and Components..........................39D 100 Certification requirements...............................................39

Sec. 6 Design and Construction Requirements for System and Special Facility Notations .............. 40

A. Introduction...........................................................................40A 100 General ............................................................................40A 200 Technical reference documents.......................................40A 300 General assumptions .......................................................40A 400 Documentation ...............................................................40

B. Position Mooring System .....................................................40B 100 General ............................................................................40B 200 Technical requirements ...................................................40B 300 Documentation requirements ..........................................40B 400 Certification of materials and components .....................40

C. Dynamic Positioning Systems ..............................................41C 100 General ............................................................................41C 200 Technical requirements ...................................................41C 300 Documentation requirements ..........................................41

D. Drilling Plant ........................................................................41D 100 General ............................................................................41D 200 Technical requirements ...................................................41D 300 Documentation requirements ..........................................41D 400 Certification of materials and components .....................41

E. Helicopter Decks ..................................................................41E 100 General ............................................................................41E 200 Technical requirements ...................................................41E 300 Documentation requirements ..........................................41

F. Well Testing Facilities..........................................................41F 100 General ............................................................................41F 200 Technical requirements ...................................................41F 300 Documentation requirements ..........................................41F 400 Certification of materials and components .....................41

DET NORSKE VERITAS

Offshore Service Specification DNV-OSS-101, April 2002 Contents –

G. Temporary Oil Storage Facilities ......................................... 42G 100 General............................................................................42G 200 Technical requirements................................................... 42G 300 Documentation requirements..........................................42

H. Crane Installations ............................................................... 42H 100 General............................................................................42H 200 Technical requirements................................................... 42H 300 Documentation requirements..........................................42H 400 Certification of materials and components .....................42

I. Diving System Installations .................................................42I 100 General............................................................................42I 200 Technical requirements................................................... 42I 300 Documentation requirements..........................................42I 400 Certification of materials and components .....................42

J. Additional Fire Protection ...................................................42J 100 General............................................................................42J 200 Technical requirements................................................... 43J 300 Documentation requirements..........................................43

K. Fire Fighters..........................................................................43K 100 General............................................................................43K 200 Technical requirements................................................... 43K 300 Documentation requirements..........................................43

L. De-icing and Anti-icing Systems..........................................43L 100 General............................................................................43L 200 Technical requirements................................................... 43L 300 Documentation requirements..........................................43

M. Periodically Unattended Machinery Space...........................43M 100 General............................................................................43M 200 Technical requirements................................................... 43M 300 Documentation requirements..........................................43

N. Integrated Computer Systems...............................................43N 100 General............................................................................43N 200 Technical requirements................................................... 43N 300 Documentation requirements..........................................43

O. Hull Monitoring System .......................................................43O 100 General............................................................................43O 200 Technical requirements................................................... 44O 300 Documentation requirements..........................................44

P. Operation in Ice Conditions..................................................44P 100 General............................................................................44P 200 Technical requirements................................................... 44P 300 Documentation requirements..........................................44

Q. Management of Safety and Environmental Protection.........44Q 100 General............................................................................44Q 200 Technical requirements................................................... 44

R. Special Feature Notations.....................................................44R 100 General............................................................................44R 200 Special feature notation SUB .........................................44R 300 Special feature notation NON-SELFPROPELLED.....44

S. Summary of Reference Documents for Additional Class Notations...............................................................................44

S 100 General............................................................................44

CH. 3 CLASSIFICATION IN OPERATION ............. 47

Sec. 1 General Provisions for Periodical Surveys....... 49

A. Introducton............................................................................ 49A 100 General............................................................................49

B. Principles ..............................................................................49B 100 General............................................................................49B 200 Due date and survey windows ........................................ 49B 300 Postponement of periodical surveys ...............................49

C. Periodical Surveys and Intervals ..........................................49C 100 Survey intervals .............................................................. 49C 200 Annual surveys ...............................................................49C 300 Intermediate surveys ....................................................... 50

C 400 Renewal surveys ............................................................. 50C 500 Other complete periodical surveys ................................. 51

D. Alternative Survey Arrangements ........................................52D 100 Continuous surveys......................................................... 52D 200 Surveys by the chief engineer or maintenance

supervisor........................................................................ 52D 300 Survey arrangement based on approved planned

maintenance system (PMS) ............................................ 52D 400 Survey arrangement based on condition monitoring

system ............................................................................. 53D 500 Surveys of units and installations out of commission .... 54

E. Special Provisions for Hull Surveys .....................................54E 100 General............................................................................ 54E 200 Access to structures ........................................................ 54E 300 Equipment for survey ..................................................... 54

F. Procedures for Class Related Services .................................54F 100 Thickness measurements of hull structures .................... 54

G. Repairs of Structural Damage...............................................54G 100 Definition........................................................................ 54G 200 Repairs ............................................................................ 54

Sec. 2 Periodical Survey Extent for Main Class ......... 55

A. General..................................................................................55A 100 Introduction..................................................................... 55

B. Annual Survey ......................................................................55B 100 Survey extent .................................................................. 55B 200 Structure and equipment for ship-shaped units .............. 55B 300 Structure and equipment for column-stabilised and self-

elevating units ................................................................. 55B 400 Machinery and safety systems for ship-shaped units ..... 55B 500 Machinery and safety systems for column-stabilised and

self-elevating units.......................................................... 55

C. Intermediate Survey..............................................................56C 100 General............................................................................ 56C 200 Structure and equipment for ship-shaped units .............. 56C 300 Structures and equipment for column-stabilised and self-

elevating units ................................................................. 56C 400 Machinery and safety systems for ship-shaped units ..... 56C 500 Machinery and safety systems for column-stabilised and

self-elevating units.......................................................... 56

D. Renewal Survey, Structure and Equipment ..........................56D 100 Ship-shaped structures .................................................... 56D 200 Column-stabilised and self-elevating structures ............ 56D 300 Alternative survey........................................................... 57

E. Renewal Survey, Machinery and Safety Systems ................58E 100 General............................................................................ 58E 200 Electrical installations..................................................... 58E 300 Instrumentation and automation ..................................... 58

F. Renewal Survey, Tailshaft Survey .......................................59F 100 Standard requirements .................................................... 59F 200 Alternative survey........................................................... 60F 300 Tailshaft condition monitoring survey arrangement....... 60

G. Renewal Survey, Thrusters for Propulsion...........................60G 100 Scope............................................................................... 60G 200 Renewal survey............................................................... 60G 300 Alternative survey........................................................... 60

H. Renewal Surveys, Boiler and Steam Heated Steam Generator ..............................................................................60

H 100 Renewal survey............................................................... 60

I. Thermal Oil Heater Survey...................................................60I 100 Renewal survey............................................................... 60

Sec. 3 Periodical Survey Extent for Additional Service Notations .............................................................. 61

A. General..................................................................................61A 100 Introduction..................................................................... 61

DET NORSKE VERITAS

Offshore Service Specification DNV-OSS-101, April 2002 – Contents

B. Drilling Units........................................................................ 61B 100 Application......................................................................61B 200 Annual survey .................................................................61B 300 Complete periodical survey ............................................61

C. Well Intervention Units ........................................................ 61C 100 Application......................................................................61C 200 Annual survey .................................................................61C 300 Complete periodical survey ............................................61

D. Accommodation Unit ........................................................... 62D 100 Application......................................................................62D 200 Annual survey .................................................................62D 300 Complete periodical survey ............................................62

E. Crane Unit............................................................................. 62E 100 Application......................................................................62E 200 Annual survey .................................................................62E 300 Complete periodical survey ............................................62

F. Offshore Support Unit .......................................................... 62F 100 Survey arrangement ........................................................62

Sec. 4 Periodical Survey Extent for Additional System and Special Facility Notations............................ 63

A. Introduction .......................................................................... 63A 100 General ............................................................................63

B. Position Mooring Equipment................................................ 63B 100 Application......................................................................63B 200 Annual survey .................................................................63B 300 Intermediate survey.........................................................63B 400 Complete periodical survey ............................................63

C. Dynamic Positioning System................................................ 63C 100 Application......................................................................63C 200 Complete periodical survey ............................................63

D. Drilling Plant ........................................................................ 63D 100 Application......................................................................63D 200 Annual survey .................................................................63D 300 Complete periodical survey ............................................64

E. Helicopter Deck.................................................................... 64E 100 Application......................................................................64E 200 Complete periodical survey ............................................64

F. Well Test............................................................................... 64F 100 Application......................................................................64F 200 Surveys............................................................................64

G. Temporary Oil Storage ......................................................... 64G 100 Application......................................................................64G 200 Annual survey .................................................................64G 300 Complete periodical survey ............................................65

H. Crane..................................................................................... 65H 100 Application......................................................................65H 200 Annual survey .................................................................65H 300 Complete periodical survey ............................................65

I. Diving Systems..................................................................... 65I 100 Application......................................................................65

I 200 Annual survey .................................................................65I 300 Intermediate survey.........................................................65I 400 Complete periodical survey ............................................66

J. De-icing or Anti-icing Systems ............................................66J 100 Application......................................................................66J 200 Annual survey .................................................................66

K. Periodically Unattended Machinery Space and Machinery Centrally Operated................................................................66

K 100 Application......................................................................66K 200 Annual survey .................................................................66K 300 Complete periodical survey ............................................66

L. Additional Fire Protection ....................................................67L 100 Application......................................................................67L 200 Complete periodical survey, all F-class notations ..........67L 300 Complete periodical survey, F-A ....................................67L 400 Complete periodical survey, F-M ...................................67L 500 Complete periodical survey, F-AM ................................67

M. Fire Fighters..........................................................................67M 100 Application......................................................................67M 200 Complete periodical survey FIRE FIGHTER I .............67M 300 Complete periodical survey FIRE FIGHTER II ............67M 400 Complete periodical survey FIRE FIGHTER III ...........67

N. Integrated Computer Systems...............................................67N 100 Application......................................................................67N 200 Complete periodical survey ............................................67

O. Hull Monitoring System .......................................................67O 100 Application......................................................................67O 200 General ............................................................................67O 300 Annual survey .................................................................67

P. Safety and Environmental Protection Management System 68P 100 Application......................................................................68P 200 Survey requirements .......................................................68

App. A Introduction to Offshore Classification ........... 69

A. Introduction...........................................................................69A 100 Purpose............................................................................69

B. The Classification System ....................................................69B 100 The classification process and its limitations..................69B 200 Who needs classification?...............................................69B 300 Recognition of DNV .......................................................69B 400 Responsibility for safety at sea .......................................69B 500 Classification of newbuildings........................................69B 600 Classification in the operational phase............................70B 700 Owner's duties .................................................................70

C. Remuneration........................................................................70C 100 Fee system.......................................................................70

D. Classification Support...........................................................70D 100 General ............................................................................70D 200 Pre-contract support ........................................................70D 300 In-service support............................................................70D 400 Limitations ......................................................................70

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Veritasveien 1, N-1322 Høvik, Norway Tel.: +47 67 57 99 00 Fax: +47 67 57 99 11

OFFSHORE SERVICE SPECIFICATIONDNV-OSS-101

RULES FOR CLASSIFICATION OF OFFSHORE DRILLINGAND SUPPORT UNITS

CHAPTER 1

PRINCIPLES AND PROCEDURES FOR CLASSIFICATION

CONTENTS PAGE

Sec. 1 Introduction .............................................................................................................................. 11Sec. 2 Classification Principles ........................................................................................................... 14Sec. 3 Classification Scope and Notations.......................................................................................... 16Sec. 4 Classification Procedure........................................................................................................... 19Sec. 5 Legal Provisions....................................................................................................................... 25

DET NORSKE VERITAS

Offshore Service Specification DNV-OSS-101, April 2002Ch.1 Sec.1 –

SECTION 1INTRODUCTION

A. Introduction

A 100 General

101 This publication, DNV-OSS-101, presents DNV’sRules for Classification of Offshore Drilling and SupportUnits, stating the terms and procedures for assigning andmaintaining classification, including listing of the applicabletechnical references to be applied for classification.

A 200 Organisation of DNV-OSS-101

201 DNV-OSS-101 is divided into three main chapters asfollows:

— Chapter 1: providing general information about classifica-tion principles and procedures

— Chapter 2: providing design and construction require-ments for the newbuilding phase

— Chapter 3: providing requirements for maintenance ofclass in the operational phase.

A 300 Objects covered

301 DNV-OSS-101 covers classification of offshore units ofthe following design types:

— ship-shaped units— column-stabilised units— self-elevating units

for the following services:

— drilling— well intervention— accommodation— heavy-lifting— general offshore support.

B. Definitions

B 100 Verbal forms

101 Shall: Indicates requirements strictly to be followed inorder to conform to this service specification and from whichno deviation is permitted.

102 Should: Indicates that among several possibilities one isrecommended as particularly suitable, without mentioning orexcluding others, or that a certain course of action is preferredbut not necessarily required. Other possibilities may be appliedsubject to agreement.

103 May: Verbal form used to indicate a course of actionpermissible within the limits of the service specification.

B 200 Definitions

201 Approval or approved: Denotes acceptance by DNV ofdocumentation showing design solutions, arrangements and/orequipment to comply with the rules.

202 Assigning class: Originally signified designation of oneof several classes to a ship based on its condition, ranging fromgood to bad. Today only the highest class is assigned, com-prising the main class, 1A1, and an obligatory additional classnotation, e.g. Drilling Unit, where applicable.

Voluntary additional class notations may also be assigned cov-ering special service, equipment or systems, e.g. DRILL de-noting a classed drilling plant.

203 The Board: Signifies the Executive Board of DNVthrough its Chairman who is the President and CEO of DNV.

204 CIBS: Classification Information Breakdown Structure(coding system for documentation).

205 Classification: Comprises those services rendered byDNV in accordance with the rules. Classification of offshoreunits is conducted in accordance with the requirements of therules and any standards referred to by the rules.

206 Classification certificate: Issued upon assignment or re-newal of class. Its validity is five years subject to successfulcompletion of annual and intermediate surveys.

207 Client: The party having requested classification or hav-ing assumed ownership of a classed offshore unit or installa-tion. In cases where owners have authorised another party tooperate the unit or installation on their behalf, such party is re-garded as the client.

208 Close-up examination: An examination where the de-tails of structural components are within the close visual in-spection range of the surveyor, i.e. preferably within reach ofhand.

209 Contract: The specific agreement between DNV and theclient. It defines the extent of services requested by the client,and is concerned with:

— the classification of offshore units or installations, bothnewbuildings and in operation

— statutory work carried out on behalf of national maritimeauthorities

— equipment and materials.

210 Det Norske Veritas (DNV): An autonomous and inde-pendent foundation with the object of safeguarding life, prop-erty and the environment.

211 Guidance note: Advice which is not mandatory for as-signment of class, but with which DNV, in light of general ex-perience, advises compliance. The client may decide whetherto apply the note or not.

212 IACS: The International Association of ClassificationSocieties.

213 IMO: The International Maritime Organization.

214 International maritime standards: International IMOconventions, protocols, codes and resolutions, in so far as theirpurpose is safety and pollution prevention, excluding articlesand regulations dealing with intergovernmental relations, legaland formal aspects.

215 LRFD methodology: Load and resistance factor designmethodology.

216 Mobile offshore unit: A buoyant construction engaged inoffshore operations including drilling, production, storage orsupport functions, not intended for service at one particularoffshore location, and which can be relocated without majordismantling or modification.

217 Offshore installation: A collective term to cover anyconstruction, buoyant or non-bouyant, designed and built forinstallation at a particular offshore location.

218 Overall examination: An examination intended to reporton the overall condition of the structure.

219 Quality audit: A systematic and independent examina-tion to determine whether established work processes andquality systems are adhered to.

220 Recognised classification society: A classification soci-

DET NORSKE VERITAS

Offshore Service Specification DNV-OSS-101, April 2002 – Ch.1 Sec.1

ety which is a full or associate member of IACS.

221 The Rules: All rule requirements accepted by the Boardas basis for classification.

222 The Society: Signifies DNV.

223 Statutory certificates: IMO convention certificates is-sued on behalf of, or by, national authorities.

224 Supplier or manufacturer: Supplies materials, compo-nents, equipment and systems to newbuildings to be classed, orto classed units in operation, whose production is subject to de-sign approval, surveys and testing in accordance with the rules.

225 Tentative rules and standards: Apply to new fields towhich DNV reserves the right to make adjustments during aperiod in order to obtain the purpose intended.

226 Vertical contract audit: An IACS audit which assessesthe correct application of the quality system through audit ofthe process for a specific contract. The IACS QSCS (QualitySystem Certification Scheme) audit team is responsible forcarrying out these audits.

227 WSD methodology: Working stress design methodolo-gy.

C. Normative References

C 100 Normative references

101 DNV-OSS-101 includes references to other DNV docu-ments and recognised codes and standards which shall be usedin conjunction with the requirements given in this documentfor assignment of class.

C 200 DNV reference documents

201 The latest revision of the documents listed in Table C1applies.

C 300 Other references301 The latest revision of the documents in Table C2 applies.

D. Informative References

D 100 DNV informative references101 The publications listed in Table D1 are referenced in thetext of this document, and may be used as a source of supple-mentary services and information.

102 The latest revision of the documents listed in Table D1applies.

D 200 Other references201 The latest version of the documents listed in Table D2applies.

E. Abbreviations

E 100 General101 The abbreviations given in Table E1 are used in thisstandard.

Table C1 DNV reference documentsReference TitleDNV-OS-A101 Safety Principles and ArrangementDNV-OS-B101 Metallic MaterialsDNV-OS-C101 Design of Offshore Steel Structures, General DNV-OS-C102 Structural Design of Offshore ShipsDNV-OS-C103 Structural Design of Column Stabilised Units

(LRFD method)DNV-OS-C104 Structural Design of Self Elevating Units (LRFD

method)DNV-OS-C201 Structural Design of Offshore Units (WSD meth-

od) DNV-OS-C301 Stability and Watertight IntegrityDNV-OS-C401 Fabrication and Testing of Offshore StructuresDNV-OS-D101 Marine and Machinery Systems and Equipment DNV-OS-D201 Electrical InstallationsDNV-OS-D202 Instrumentation and Telecommunication Sys-

temsDNV-OS-D301 Fire ProtectionDNV-OS-E101 Drilling Plant DNV-OS-E201 Hydrocarbon Production PlantDNV-OS-E301 Position MooringDNV-OS-E401 Helicopter DecksDNV-RP-A201 Standard Documentation TypesDNV-RP-A202 Documentation of Offshore Projects

Rules for Classification of ShipsRules for Certification of Lifting AppliancesRules for Certification of Diving Systems

Table C2 Non-DNV normative referencesReference TitleIACS Shipbuilding and Repair Quality Standard

Table D1 DNV informative referencesReference TitleDNV-OSS-102 Rules for Classification of Floating Production

and Storage UnitsDNV-OSS-202 Verification for Compliance with UK Shelf

Regulations Standard for Certification 1.2

Type Approval

Classification Note 72.1

Allowable Thickness Diminution for Hull Structures

Table D2 Other referencesReference TitleAPI RP 8B Inspection, Maintenance, Repair, and Remanufac-

ture of Hoisting EquipmentBS 5430-1 Periodic inspection, testing and maintenance of

transportable gas containers (excluding dissolved acetylene containers). Specification for seamless steel containers of water capacity 0.5 litres and above

PD 5500(PreviousBS 5500)

Specification for unfired fusion welded pressure vessels

Table E1 AbbreviationsAbbreviation In fullAPI American Petroleum Institute BS British Standard (issued by British Standard Insti-

tution)DFF Design fatigue factorsDNV Det Norske VeritasDP dynamic positioningIC inspection categoryIIP in service inspection programISO International Organisation for StandardisationLRFD load and resistance factor designMPI magnetic particle inspectionNDT non-destructive testing

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OS Offshore standardOSS Offshore service specificationRP recommended practiceSCF stress concentration factorWSD working stress design

Table E1 Abbreviations (Continued)Abbreviation In full

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SECTION 2CLASSIFICATION PRINCIPLES

A. The Classification Concept

A 100 Introduction

101 Classification is a comprehensive verification serviceproviding assurance that a set of requirements laid down inrules established by DNV are met during design and construc-tion, and maintained during operation of an offshore unit.

Classification has gained world-wide recognition as represent-ing an adequate level of safety and quality.

102 Classification implies an activity, in which an offshoreunit is surveyed during construction on the basis of design ap-proval, tested before being taken into service, and surveyedregularly during its whole operational life. The aim is to verifythat the required safety standard is built in, observed and main-tained.

103 Having assigned class, DNV will issue a classificationcertificate and enter the main particulars and details of class inthe “Register of vessels classed with DNV”.

A 200 Entering into force and application of rules201 Rules and amendments accepted by the Board will comeinto force when decided by the Board, normally six (6) monthsafter acceptance.

202 The rules which are in force at the date of the written re-quest for classification, are the basis for the assignment andmaintenance of class.

Subsequent amendments not made mandatory according to204 may be applied to objects under construction providedboth builder and owner agree to such application.

203 In exceptional cases, where unacceptable service expe-rience and/or theoretical findings clearly show that safety haz-ards may arise in connection with items covered by the existingrules, DNV may lay down supplementary requirements tomaintain the overall safety standard reflected by the rules.

204 DNV will consider alternatives found to represent anoverall safety standard equivalent to that of the rules. Approvalmay be revoked if subsequent information indicates that thechosen alternative is not satisfactory.

205 In cases where detailed requirements are not given in therules, specific solutions or decisions approved by DNV and itssurveyors shall be based on the principles of the rules, and shallgive a safety standard equivalent to that of the rules.

206 In accordance with 204, DNV may consider the use ofreliability methods as a means of documenting compliance toclass requirements.

A 300 Basis for assignment of class

301 Having assigned a specific class implies that DNV:

— has been satisfied that the object meets the rule require-ments for the particular class

— will verify, through a system of surveys, that the require-ments stipulated for retention of class are complied with.

302 Prior to assigning class to an existing offshore object, itis in general to undergo all periodical surveys pertaining to theage and type of object.

303 When assigning class to an offshore unit which has notbeen built under supervision of DNV, but by another recog-nised classification society, DNV may on the basis of an over-all safety consideration give exemptions from rulerequirements.

304 When assigning class to offshore units belonging to a se-ries, where others are under construction to class by anotherrecognised classification society, DNV may on the basis of anoverall safety consideration give exemptions from DNV rulerequirements, and base the survey on the design approval doneby the other recognised society. The same applies for a designpreviously accepted by another recognised society. A note tothis effect may be included in the Appendix to the classifica-tion certificate.

305 When assigning class to an offshore unit registered in aflag state that undertakes approval and surveys of items cov-ered by the rules, DNV may accept their decisions as basis ofassigning class.

306 DNV may also accept decisions by the national authori-ty with jurisdiction over the waters in which the unit or instal-lation is to operate (shelf state) as basis for assigning class.

A 400 Basis for maintenance of class401 The requirements for retention of class are found inSec.4 B. In addition, classification is based on the followingassumptions:

1) Maintenance of the unit and its equipmentThe unit, machinery installations and equipment shall bemaintained at a standard complying with the requirementsof the rules. Installed systems or equipment carried on board in excessof the rule requirements, but otherwise covered by therules, shall either be maintained in accordance with therules, or be removed or disconnected in such a way as toensure that the installed system or equipment cannot beused.

2) Handling of the unitThe unit, machinery installations and equipment shall beadequately manned and competently handled. Class con-ditions regarding the use of the unit shall be observed.

3) Valid statutory certificates The statutory certificates of the applicable internationalconventions shall be valid at all times, and the surveys pre-scribed in the conventions shall be carried out within thetime windows prescribed.

4) Recording of lightweight and centre of gravityThe data for lightweight and centre of gravity (C.o.G.)shall be continuously recorded and adjusted by the masterfor any items taken onboard or ashore during operation.

A 500 Documentation501 All information which may influence the judgement, de-cisions and requirements of DNV for the purpose of classifica-tion, shall be made available to DNV. It is the client'sresponsibility to ensure that such information is brought to theattention of DNV in a timely manner. Information may bemade available by submitting documents or by surveys per-formed at the client’s premises, onboard or at the premises ofthe client's sub-contractors.

502 The documentation forming the basis for classificationis, at all times, to reflect the true conditions. Revisions of doc-uments are therefore to be submitted to DNV to the extent suchrevisions may influence decisions and requirements relating toclass.

A 600 Disclosure of information601 DNV will not disclose any information received or re-

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ports made in connection with classification to any other thanthose entitled thereto or those having been given the right toreceive information by legislation, court decision or by writtenpermission by the owner.

The supply of information may take place electronically andon a continual basis, e.g. by on-line access to DNV's databases.

Guidance note:Table B1 indicates which parties will be entitled to various kindsof information.

---e-n-d---of---G-u-i-d-a-n-c-e---n-o-t-e---

602 DNV will not disclose information that can be consid-ered as the property of another party except when this party'spermission is given in writing.

603 Internal communication, notes, calculations etc. pro-duced within DNV in connection with classification will not bedisclosed to other parties.

604 Notwithstanding 601 to 603, authorised representativesof the national maritime authorities or of the audit team ofIACS performing quality audits, will have access to such infor-mation. These representatives are to confirm in writing thatthey are not in any manner allowed to reproduce or communi-cate such information to other parties.

605 Notwithstanding 601 and 603 DNV may disclose any in-formation to a police authority upon a written request by thesame.

A 700 Limitation of DNV's responsibility

701 The classification service is performed on the basic as-sumption that other parties involved (building yard, designers,manufacturers, sub-contractors, owners, etc.) fulfil their indi-vidual obligations. The classification service is not performedin substitution of other parties' role or obligations. Nothingcontained herein or in any certificate, report or document is-sued in connection with or pursuant to these rules, shall relieveany designer, engineer, builder, manufacturer, yard, seller,supplier, owner, operator or other parties from any obligationsor consequences of default whatsoever. In particular, compli-ance with the rules does not imply acceptance or commission-ing of an offshore unit. This is the exclusive responsibility ofthe owner.

Any document issued by DNV in relation to surveys per-formed reflects the condition of the unit at the time of survey.It is the responsibility of the owner to maintain the conditionof the unit as required by the rules between surveys.

A 800 Vertical contract audits and audits by national maritime authorities

801 For the purpose of conducting vertical audits performedby the audit team of IACS, and audits performed by the nation-al maritime authorities of the flag state, access shall be provid-ed to the unit and/or to the premises of manufacturer or yard,as appropriate.

Table A1 Disclosure of information

Information in question Owner Flag Administra-tion

Port State Authority

Insurance Company * Yard or suppliers

Newbuildings:a) Approved "as carried out" structure

related drawings 2) 1) 4)

b) Approved "as carried out" system and component drawings 2) 2) 2)

Units in operation:a) Class and statutory certificates is-

sued by DNV 4) 1) 1) 3)

b) Survey and certificate status in-cluding text of conditions of class 4) 4) 1) 1)**

c) Survey reports 4) + 1) 1) 2) 3)Other information: Correspondence with yard or owner 2) 2) 2) 2)1) Upon request

2) When accepted by owner or yard and copyright holder as applicable

3) When accepted by owner or through special clause in insurance contract

4) Automatically available

* Insurance company means P&I clubs and hull/structure & machinery underwriters ** Overdue conditions of class, only

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SECTION 3CLASSIFICATION SCOPE AND NOTATIONS

A. Scope of Classification

A 100 General101 The rules and referred standards define acceptance crite-ria for design, construction, survey and testing of offshoreunits, their marine and machinery installations, systems andequipment, applicable to the newbuilding and operationalphase.

A 200 Rule parts201 The present offshore service specification states termsand procedures for assigning and maintaining class for off-shore drilling and support units, as well as listing the applica-ble technical reference documents stipulating technicalrequirements for classification. These may be DNV offshorestandards, other DNV standards and internationally recognisedcodes.

A 300 Rule particulars301 The rules with reference standards give requirements inthe following areas:

B. Class Notations

B 100 General

101 Classed units will be given a class designation consist-ing of:

— construction symbol— main character of class— basic design notation— service notation— system and special facility notations (as applicable) — special feature notations (as applicable).

B 200 Construction symbols

201 The symbol will be given to units built under the su-pervision of DNV.

202 The symbol will be given to units built under the su-pervision of a recognised classification society and later as-signed class with DNV.

B 300 Main character of class

301 The notation 1A1 will be given to units with hull andmarine machinery and equipment found to be in compliancewith the basic (common) requirements of the applicable DNVoffshore standards referred to in the rules.

B 400 Basic design notations

401 The basic design notation indicates the type of structure.The notations currently in use are given in Table B1.

402 For types of units not properly characterised by the listednotations, the basic notation:

1A1 Mobile Offshore Unit

may be used.

B 500 Service notations

501 Units constructed according to DNV rules for offshoreclassification, arranged for a particular service and found to bein accordance with the relevant requirements for such service,will be given a corresponding service notation.

502 Service notations currently in use are defined in TableB2.

Hull and main structure— strength— materials and welding— corrosion protection — constructional fire protection— weathertight and watertight integrity— stability and floatability— tank arrangement.

Marine and machinery installations and equipmentMachinery installations and equipment, including their related aux-iliary functions, with respect to strength and performance as applica-ble to the following main functions:— power generation— propulsion (if applicable)— steering (if applicable)— fire protection, detection and extinction— drainage and bilge pumping— ballasting— anchoring and mooring— hazardous area categorisation (as applicable).

Certain machinery installations, regardless of their contribution to the main functions stated above:

— electric power plant— gravity tanks or pressure vessels and associated piping systems

for:

— toxic fluids— fluids with flash point below 100°C— fluids with temperatures above 220°C— boilers and steam piping systems— pressure vessels and associated piping systems for com-

pressed gases where:pV ≥ 150 kNmp = design pressure in kN/m2

V = pressure vessel volume in m3

— firing and combustion installations — other installations stated in the rules.

Table B1 Basic design notationsBasic design notation Description

Ship-shaped UnitMonohull ship and barge type units having displacement hulls with or without propulsion machinery.

Column- stabilised Unit

Unit dependant on the buoyancy of widely spaced columns for floatation and stability for all modes of opera-tion.

Self-elevating Unit

Unit with hull of sufficient buoyancy for safe transport which is raised above sea surface on legs supported by the sea bed during operation.

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503 The service notations in Table B2 shall be consideredmandatory for the relevant types of units.

504 Classification services related to hydrocarbon produc-tion and storage are presented in separate rules, DNV-OSS-102.

B 600 System and special facility notations

601 Units having special facilities, systems or equipmentfound to satisfy specified class requirements will be given acorresponding class notation. Notations currently in use aregiven in Table B3.

B 700 Special feature notations

701 Special feature notations provide information regardingspecial design assumptions, arrangements or equipment whichare not covered by other class notations.

702 Special feature notations currently in use are listed inTable B4.

B 800 Service restrictions

801 Units not approved for unrestricted service will have rel-evant service restrictions stated in the “Appendix to the classi-fication certificate”. These units will be given the classnotation R to indicate that restrictions apply.

The notation R will be inserted after the main character ofclass.

802 Other service restrictions or operational limits includedin the design assumptions of a unit will be stated in the “Ap-pendix to the classification certificate”, and/or on special sign-boards onboard.

803 Service restrictions and deviations from the rule require-ments shall be addressed in a memo for owners (MO) inform-ing them about the assumption for the class notation if the unitshall be operated outside the geographical areas or otherboundaries agreed in the classification contract.

B 900 Compliance with shelf state legislation

901 When DNV is requested to carry out verification in ac-cordance with shelf state regulations for the complete unit orparts of the unit, an additional notation may be assigned to therelevant class designations, consisting of the relevant shelfstate code and the issue of shelf state regulations used as basisfor verification in brackets, e.g.:

DRILL(N).

Table B2 Service notationsNotation DescriptionDrilling Unit with drilling as a main function

Well Intervention Unit with well intervention as a main function

Accommodation Units primarily used for accommodation purposes

Crane Units primarily used for heavy-lift pur-poses

Offshore SupportUnits intended for offshore support func-tions (fitted with only parts of equipment necessary to perform main functions)

Table B3 System and special facility notationsNotation DescriptionCRANE Equipped with crane(s) DEICE or DEICE-C

Unit equipped with de-icing or anti-icing systems

DRILL Drilling plant DSV-I SF Equipped with diving system with opera-

tional limitationsDSV-II SF Equipped with diving system with opera-

tional limitationsDSV-III SF Equipped with diving system without oper-

ational limitationsDYNPOS-AUTS Dynamic positioning system without redun-

dancyDYNPOS-AUT Dynamic positioning system with an inde-

pendent joystick back-up and a position ref-erence back-up

DYNPOS-AUTR Dynamic positioning system with redun-dancy in technical design and with an inde-pendent joystick back-up

DYNPOS-AUTRO Dynamic positioning system with redun-dancy in technical design and with an inde-pendent joystick back-up. Plus a back-up dynamic positioning control system in an emergency dynamic positioning control centre, designed with physical separation for components that provide redundancy

E0 Unit equipped for unattended machinery space

ECO Unit equipped for operation of machinery from centralised control station

F-A Additional fire protection of accommoda-tion space

F-AM Additional fire protection of accommoda-tion and machinery space

F-M Additional fire protection of machinery space

FIRE FIGHTER I Early stage fire fighting and rescue close to structure on fire

FIRE FIGHTER II Continuous fire fighting and cooling of structures on fire

FIRE FIGHTER III As FIRE FIGHTER II, plus larger pumping capacity and more comprehensive equip-ment

HELDK Helicopter deck structureHELDK-S Helicopter deck structure including safety

aspect related to the unit HELDK-SH Helicopter deck structure including safety

aspect related to the unit and to the helicop-ter

HMON-1 Provided with basic hull monitoring systemHMON-2 Provided with comprehensive hull monitor-

ing incorporating measurement of environ-mental conditions

ICE-L Strengthened for ice condition operationICE-T Strengthened for ice condition transitICS Unit equipped with integrated computer

systemPOSMOOR Passive position mooring systemPOSMOOR-V Mooring system designed for positioning in

vicinity of other structures POSMOOR-TA Thruster assisted mooring system depend-

ent on manual remote thrust control systemPOSMOOR-ATA Thruster assisted mooring system depend-

ent on automatic remote thrust control sys-tem

SBM Unit with implemented management systemTEMPSTORE Temporary storage of oilWELLTEST Facilities for well testing

Table B4 Special feature notationsNotation DescriptionSUB Column-stabilised unit strengthened for oper-

ation when resting on sea bed NON-SELFPRO-PELLED

A unit for which towing assistance will be re-quired during transit.

Table B3 System and special facility notations (Continued)Notation Description

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902 Shelf state code notations currently in use, are listed inTable B5.

903 For further information on procedures and scope of ver-ification for shelf state requirements, see DNV offshore serv-ice specifications for shelf state compliance services listed inTable B5.

B 1000 Combination of notations

1001 Class notations shall be combined as follows:

1A1 <service restriction, if any><basic design no-tation> <service notation> Unit

<system and special facility notations> <special fea-ture notations>Example:

1A1 Column-stabilised Drilling Unit POSMOOR NON-SELFPROPELLED.

Table B5 Notations for shelf state verificationNotation DescriptionAccommodation Unit(N)

Verified for compliance with DNV’s in-terpretation of relevant Norwegian shelf state requirements.

Drilling Unit(N)Offshore Support Unit(N)POSMOOR(N)DRILL(N)Drilling Unit(UKVS) Verified for compliance with DNV’s in-

terpretation of relevant UK shelf state re-quirements.

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SECTION 4CLASSIFICATION PROCEDURE

A. Assignment of Class

A 100 Request for classification

101 A request for classification shall be submitted in writingby the client.

A 200 Requirements for workshops and yards

201 Builders shall operate a quality management system ap-plicable to the scope of their work. The system shall be docu-mented and contain descriptions and procedures for qualitycritical aspects.

202 Builders unknown to DNV shall demonstrate their capa-bility to carry out fabrication of adequate quality in accordancewith the rules before construction is started.

203 Builders shall maintain a traceable record of non-con-formities and corrective actions and make this available toDNV on request.

Guidance note:Builders are encouraged to obtain ISO 9000 series quality systemcertification through DNV accredited quality system certifica-tion services.


204 Welding of important structures, machinery installationsand equipment shall be carried out by approved welders, withapproved welding consumables and at welding shops acceptedby DNV.

205 During fabrication and construction work, DNV survey-ors shall have safe access to the works at all reasonable times,insofar as the work affects classification. The client shall en-sure, through contracts with the parties concerned or other-wise, that such access is possible, and that DNV is notified asto when and where the surveyor's attendance is needed.

A 300 Information about subcontractors and suppliers of products301 The following documentation from the builder (work-shop and yard) and from subcontractors shall be submitted toDNV at the start of a classification project:

— list of subcontractors to the building yard— list of suppliers of materials and components, including

subcontractors if applicable.

A 400 Requirements for manufacturers

401 Manufacturers of materials, components and equipmentfor main class shall be approved according to criteria estab-lished by DNV, as applicable.

402 Any required quality control of materials, componentsand equipment, shall be traceable and documented in writing.Further, quality control shall be carried out by qualified per-sonnel at facilities and with equipment suitable for that control.

A 500 Requirements for suppliers of services501 Firms providing services on behalf of the owner, such asmeasurements, tests and maintenance of safety systems andequipment, where the results may form the basis for the sur-veyor's decisions, shall be approved by DNV.

Where surveyors use such services in making decisions affect-ing statutory certifications, the suppliers are subject to approv-al by DNV in cases where DNV is authorised by the relevantadministration to do so. For such services DNV may accept ap-provals done by the administration, or duly authorised organi-

sations acting on behalf of the administration.

A 600 Requirements for calibration of equipment601 Measuring and test equipment used in services by man-ufacturers, builders, repairers or owners, where the results mayform the basis for the surveyor's decisions, shall have a docu-mented calibration status.

Guidance note:For test equipment used for periodic maintenance and testing ofE0, see the Rules for Classification of Ships Pt.6 Ch.3.


A 700 Document approval701 The builder or manufacturer shall make available toDNV the following documentation according to documenta-tion lists supplied by DNV upon receipt of class request, beforeproduction commences:

a) Documentation required for approval. Moreover, DNVmay specify alternative or additional requirements.

b) Corresponding technical descriptions, calculations and da-ta, including material specifications.

Any documents submitted for re-approval shall be especiallymarked to identify the revised parts.

The builder, with which DNV has the classification contract, isresponsible for co-ordinating that drawings and other docu-ments are submitted, and for distributing any approval com-ments that may have been given.

702 When a unit, which is not built under supervision ofDNV, shall be classified, the information required in 701 shall,in general, be submitted for approval. The extent of documen-tation approval for a unit, which is classed, or which was pre-viously classed, with another recognised classification society,will be decided upon in each case.

703 Documentation that has been found to comply with therule requirements will be provided with a statement of approv-al. Conditions and limitations of the approval will be stated asagreed in the classification contract.

704 The approval may be revoked at any time if subsequentinformation indicates that the design solution was contrary tothe rule requirements or intentions.

705 The English language shall be used in drawings andspecifications submitted for approval. The possibility of usingthe local language shall be agreed upon in each case.

706 When drawings and documents are submitted as elec-tronic files, the format and transfer method shall be agreedupon in each case.

A 800 Survey801 When a unit is built under the supervision of DNV, thefollowing will be verified:

— that the construction and dimensions comply with the rulerequirements and the approved documentation, and thatthe required materials are used

— that the materials, components and systems have been cer-tified in accordance with the rules

— that the work is carried out in compliance with the rulesand with good engineering practices. IACS "Shipbuildingand Repair Quality Standard - Part A" is regarded as an ex-ample of a standard regarding hull structures describingsuch good engineering practices

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— that satisfactory tests are carried out to the extent and in themanner prescribed by the rules.

Supervision will be carried out at the building yard and/or thesub-suppliers at the discretion of DNV, which also decides theextent and method of control.

802 The verification method applied by DNV at the buildingyard or at the manufacturers will be based on a combination ofaudits of an accepted quality system and visual inspections andtests.

803 When a unit, which has not been built under the supervi-sion of DNV, shall be classified, DNV will carry out surveysto confirm:

— that the design and dimensions comply with the approveddocumentation

— that the materials, components and systems are in accord-ance with the rules

— that the workmanship is in compliance with the applicablerules and with good engineering practice.

Functional tests will be carried out as deemed necessary byDNV.

804 For units built under the supervision of another recog-nised society the requirements of 803 will normally be consid-ered as complied with for the main class.

805 When an existing unit is to be classified, it is in generalto undergo all periodical surveys pertaining to the age and typeof unit.

The extent of surveys will be decided by DNV in each separatecase.

A 900 Functional testing

901 A test programme shall be prepared by the builder. Theprogramme shall specify systems and components to be tested,and the testing procedure. The programme shall include sea tri-als with machinery and equipment installed (as applicable).

902 The tests shall give evidence of satisfactory operation inaccordance with the rules. When testing the control and safetysystem, failure modes shall be simulated as realistically as pos-sible.

903 Unless otherwise agreed, the testing required by therules shall be carried out in the presence of a surveyor. Datashall be recorded according to the test programs and as consid-ered necessary by the surveyor.

A 1000 Certification of materials, components and sys-tems1001 The scope of classification includes certification of ma-terials, components and systems intended for the unit. Therules define the extent of the certification that is needed forclassification. The objective of the certification is to ensurethat materials, components and systems used in units to beclassed by DNV conform to the rules and referenced standardswithin the framework of the rules.

The certification is a conformity assessment normally includ-ing both design and production assessment.

The production assessment includes inspection and testingduring production and/or of the final product.

1002 The design assessment of the materials, componentsand systems shall either be on a “case by case” basis or followthe procedure for type approval.

1003 When the “case by case” procedure is used, documen-tation of the design shall be submitted for assessment for everyapplication as required in the rules. A design assessment letteror design verification report shall be issued by DNV whencompliance with the requirements for the design for the actualapplication is confirmed.

1004 When the type approval procedure is used, documenta-tion of the design and the results of type testing as required intype approval programmes and the rules, shall be submitted forassessment. A type approval certificate shall be issued byDNV when compliance with the requirements for the design isconfirmed. The type approval certificate has a validity of 2 or4 years depending on type of material, component and system.

1005 The production assessment of materials, componentsand systems shall either be on a “case by case” basis or on thebasis of an agreed Manufacturing Survey Arrangement(MSA).

1006 When the “case by case” procedure is used, the surveyand testing shall be performed on the basis of approved designdocumentation for the actual application and as required in therules. Compliance with the approved design documentationand the requirements shall be documented through certificatesas required in the rules.

1007 When the production assessment is based on an MSA,the survey and testing shall be performed on the basis of ap-proved design documentation and in accordance with require-ments and procedures laid down in the MSA. Compliance withthe approved design documentation and the requirements shallbe documented through certificates as specified in the MSA oras required in the rules.

1008 Certification of materials, components and systemsshall be documented by the following types of documents:

1) DNV Product certificate (NV):A document signed by a DNV surveyor stating:

— conformity with rules or standard requirements— that tests are carried out on the certified product itself— that tests are made on samples taken from the certified

product itself— that tests are performed in presence of the surveyor or

in accordance with special agreements.

2) Works certificate (W):A document signed by the manufacturer stating:

— conformity with rules or standard requirements— that tests are carried out on the certified product itself— that tests are made on samples taken from the certified

product itself— that tests are witnessed and signed by a qualified de-

partment of the manufacturers.

3) Test report (TR):A document signed by the manufacturer stating:

— conformity with rules or standard requirements— that tests are carried out on samples from the current

production.

The applicable rules or standards will specify which of theabove mentioned documentation will be required.

1009 Where the rules require Works certificate (W) or Testreport (TR), the surveyor may at any time require tests to becarried out in his presence and/or check elements of the qualitycontrol in operation.

1010 For identification and traceability, certified productsshall be stamped in accordance with the marking given in theproduct certificate and as specified by the applicable rules orstandards.

1011 For certain components and systems as defined in therules, the certification may be based on defined internationallyrecognised standards and certification schemes that cover theoverall quality, safety and environmental standard of the rules.Compliance with the requirements of the standard shall be doc-umented as required by the standard.

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1012 To ensure an efficient, cost effective and correct certi-fication process, a general certification agreement is normallyto be established with manufacturers delivering NV certifiedproducts.

The general certification agreement may be part of a manufac-turing survey arrangement (MSA).

The general certification agreement shall include informationon the procedures for design and production assessment and ontransfer of information and experience between the manufac-turer and DNV.

A 1100 Manufacturing survey arrangement1101 When the procedures and processes of a building yard'sor a manufacturer's quality system meet the quality, safety andenvironmental standard of the rules, a manufacturing surveyarrangement (MSA) may be established with the yard or themanufacturer as an alternative to the verification and produc-tion assessment described in the applicable rules.

1102 The agreed MSA shall be described in a document stat-ing the requirements, scope, acceptance criteria, documenta-tion and the roles of DNV and the yard or the manufacturer inconnection with the production assessment.

1103 When it is agreed through an MSA that the majority ofthe required surveys and tests are being completed without thepresence of a surveyor, it is conditional upon the manufacturerthat he has in operation a quality system certified by an accred-ited certification body to ISO 9002, or equivalent.

1104 When establishing an MSA, an initial assessment of themanufacturer’s ability to control product quality and to complywith the scope, requirements and criteria laid down in the MSAshall be performed. The extent and frequency of periodical as-sessments of the manufacturer shall be included in the MSA.

1105 An MSA is normally given a validity of 4 years. Whenthe MSA is based on a certified quality system, the MSA auto-matically becomes invalid if the quality system certification isno longer valid.

A 1200 Type approval

1201 Type approval is a procedure for design assessment.Type approval can be applied to a:

— product— group of products— system.

This procedure should normally be used for design assessmentof standard designs.

1202 The type approval procedure will normally consist ofthe following elements:

— design approval— type testing— issuance of type approval certificate.

The type approval procedure used by DNV is described inStandard for Certification 1.2.

1203 For certain products, equipment and systems as de-fined in the rules, type approval is sufficient as the assessmentneeded for conforming product quality, i.e. production assess-ment is not required.

1204 For certain products, equipment and systems as de-fined in the rules, type approval is a mandatory procedure fordesign assessment.

1205 For products, equipment and systems manufactured forstock, type approval shall be the normal procedure for assess-ment of design.

1206 For type approved products, where the basis for ap-proval is the rules, documentation of the product need not be

submitted for approval for each offshore unit unless otherwisestated as a condition on the type approval certificate. In suchcases only the arrangement or system plans, interface plansand those plans mentioned on the type approval certificateshall be submitted for approval.

A 1300 Acceptance of control by national authorities

1301 In cases where the administration of a flag state re-views plans, carries out type approval, and surveys the unitand/or its components and equipment in accordance with therules requirements, consideration will be given to the accept-ance of this control as basis for the assignment of class.

A 1400 Certificate of interim class

1401 When the surveyor is of the opinion that the require-ments corresponding to the class in question have been met, hewill document the completion of the building supervision byissuing the certificate of interim class, which is valid until theadministration of DNV has confirmed the class and issued theclassification certificate.

1402 At the discretion of the surveyor the building supervi-sion may be considered to be completed with some minoritems unverified, provided conditions of class are issued to theeffect that the remaining work, surveys or other measures shallbe completed within a specified time. At the same time the sur-veyor will document the completion of the newbuilding super-vision by issuing the certificate of interim class as indicated in1401.

1403 In case of classification of an existing unit not built un-der the supervision of DNV, or classification of an existingunit previously classed by DNV, the surveyor will issue thecertificate of interim class when he is satisfied that the applica-ble requirements have been met.

A 1500 Classification certificate

1501 When the administration of DNV has examined thesurveyor's report and is satisfied that the requirements havebeen met, class will be assigned and a classification certificatewill be issued.

Provided the requirements for maintenance of class will becomplied with, and unless the class has been withdrawn inwriting at an earlier stage, the classification certificate will bevalid for 5 years.

A 1600 Appendix to the classification certificate

1601 An “Appendix to the classification certificate” will beissued stating assumptions for the assignment of class and con-ditions regarding the use of the unit, which were established orassumed at the time of assignment of class.

A 1700 Entry in the “Register of vessels classed by DNV”

1701 When an offshore unit has been assigned class, its mainparticulars and details of class will be entered in the Register.In addition to the class notations, an appropriate type descrip-tive note may be entered in the Register.

1702 For units built under the supervision of DNV, the classis entered with a statement of the year and month from whichthe periodical surveys will be dated. For other units a notationis made of the year and month of completion of the surveymentioned in 805.

1703 If the unit is not immediately commissioned upon com-pletion of the building supervision, the unit is subject to a con-dition survey at the time when it enters service. Provided theresult of this survey is in all respects satisfactory, subsequentperiodical surveys will date from the time of the condition sur-vey.

A 1800 Decline of application for classification1801 DNV reserves the right to decline an application for

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classification or reclassification where the prior history or con-dition of the unit or prior experience with the owner indicatesthis to be appropriate.

B. Retention of Class

B 100 General101 In order to retain a unit’s class, the owner shall:

— submit complete and correct information on the unit andits use, which would be of significance to DNV for assess-ment of the condition of the unit in relation to the rules andreferred standards

— submit complete and correct information on the ownershipand management of the unit, addresses and correspondingadministrative information pertinent to the relations withDNV

— subject the unit to prescribed periodical and renewal sur-veys, surveys of damage, repairs, conversions and altera-tions

— subject the unit to unscheduled surveys when deemed nec-essary by DNV

— carry out conditions of class specified by DNV in accord-ance with the rules within the given time limit

— pay all fees and expenses due to DNV. The owner has,with his or her managers, charterers and operators, a jointand several liability for any such fees and expenses. If a re-quest for work is made by any other than the owner, thatparty will, in addition to the owner, be responsible for thepayment of the relevant fees.

102 It is the duty of the owner to request surveys from DNVand to provide the assistance and safe access required to the ex-tent necessary for completion of the surveys in accordancewith the rules.

103 It is a prerequisite for retention of class that:

— the statutory certificates (as applicable) are valid at alltimes

— the surveys prescribed in the statutory regulations are car-ried out within the time frames prescribed

— the certificates are issued by DNV when so authorised orelse by the flag administration itself, except for the safetyradio certificate (if a separate certificate) where DNV mayaccept the certificate issuance by any organisation author-ised by the flag administration.

Guidance note:In case of dually classed units, DNV may accept statutory certi-fication by the 'dual' class society, upon agreement.


104 In co-operation with port states or shelf state authorities,a surveyor will attend on board a classed unit when so request-ed by a port state or shelf state authority, in order to assist inthe rectification of reported deficiencies or other discrepanciesrelated to classification.

Prior to attendance on board, the surveyor will inform the own-er or owner's representative. Where appropriate, the unit's flagstate will be notified of such attendance and survey.

B 200 Periodical and renewal surveys201 A unit shall be subjected to surveys with frequency andextent given in the rules.

Surveys carried out by national authorities of the flag state maybe accepted as basis for the retention of the class.

B 300 Survey of damage

301 If the hull, machinery installations, systems or equip-

ment covered by classification sustain damage of such extentthat it may be presumed to lead to a condition of class, DNVshall be informed without delay. The unit shall be surveyed asconsidered necessary by DNV for ascertaining the amount ofdamage.

B 400 Repairs401 When hull, machinery installations, systems or equip-ment is covered by classification and is to be subjected to re-pairs of any significance, then the work shall be carried out byqualified personnel and in compliance with the applicablerules, and with good engineering practices under the supervi-sion of a surveyor.

Guidance note:IACS "Shipbuilding and Repair Quality Standard - Part B" is re-garded as an example of a standard concerning hull structuresthat describe such good engineering practice. Guidelines for hullrepairs can be found in Classification Note 72.1.


402 If repairs (e.g. during voyage) stipulated in 401 are to becarried out without the attendance of a surveyor, a repair planshould be approved by DNV in advance.

Repairs shall only be carried out to an extent and by methodswhich at any time do not seriously affect the main functions ofthe unit and its watertight and structural integrity.

403 In cases where repairs are carried out without attendanceof a surveyor, documentation with respect to quality of materi-als used, and the qualification of personnel having carried outthe repairs, shall be available when the surveyor is called foracceptance.

B 500 Procedures for maintenance501 When referring to maintenance procedures in the rules,these are normally meant to be procedures recommended bythe supplier of the relevant equipment or systems or to otherapplicable recognised standards for the equipment or system inquestion.

B 600 Conversions and alterations601 If hull, machinery installations, equipment or systemscovered by classification are to be converted or altered, thechanges shall be documented and approved by DNV in ad-vance.

602 Alterations to hull, machinery and equipment made pos-sible by amendments of the applicable rules may be undertak-en provided the general safety and performance standardrequired for retention of class will be maintained.

603 The conversion or the alteration shall take place underthe surveyor's supervision in the same manner as for new con-structions.

604 Units which undergo conversions or alterations shall sat-isfy the following:

— comply with all requirements applicable when the unit wasfirst built

— repairs, alterations and modifications of a major characterand related outfitting shall meet the requirements in forceat the time of conversion as far as DNV deems reasonableand practicable.

605 By modifications of a major character is to be under-stood major conversions defined as a conversion of an existingunit:

— which substantially alters the dimensions or carrying ca-pacity of the unit

— which changes the service type of the unit— the intent of which in the opinion of DNV is substantially

to prolong its life.

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606 Repairs, alterations and modifications shall not impairthe safety standard of the unit.

B 700 Change of ownership701 A unit retains class when transferred to another owner.In the case of such transfer the previous owner shall give DNVa written notice immediately. Until this has been done, com-munication with binding effect will be sent to the previousowner.

B 800 Conditions of class and memoranda801 If it is found that the unit's hull, machinery and or equip-ment have sustained damage, become defective or deficientrelative to the applicable requirements, DNV will issue a writ-ten statement in the form of a condition.

802 A condition of class (abbreviated CC) will be issued ifthe condition is related to requirements set by the rules. A CCis subject to specified rectification (e.g. repairs) or operation(e.g. survey) and shall be carried out within a given time limit,in order that the unit retains class. If the defect or deficiency isof a nature that requires immediate rectification, then this willbe specifically communicated to the owner or his representa-tive.

803 A condition on behalf of the administration (abbreviatedCA) will be issued if the condition is related to requirementsgiven by the national authority and is outside the scope of clas-sification.

804 If DNV deems it necessary to carry out examinations inorder to ascertain whether damage defect or insufficiency hasbeen sustained or is imminent, a condition (CC or CA) will beissued.

805 A Memorandum to owner (abbreviated MO) is informa-tion related to the unit, its machinery and equipment or to rulerequirements. An MO will be issued in relation to items thatare considered to be of no immediate material significance re-garding safety. An MO may supplement information givenotherwise, e.g. in the "Appendix to the classification certifi-cate" (see A1500) or the "Register of vessels classed withDNV" (see A1601).

An MO may, for example, be used in the following cases:

— exemptions from rule requirements— limitations on the use of the unit or its equipment— deficient or lack of documentation— defects or deficiencies of no concern to class— technical measurements or examinations required— suspended voluntary class notations— equipment in excess of class requirements taken out of

use.

806 A time limit may be given if an action is required by theowner under the MO. If the required action is not carried outwithin the given time limit, the MO will be replaced by a CC.

807 Conditions and memoranda are given in writing to theowners. Conditions may be made verbally, provided that therepresentative of the owner(s) accepts the condition and thesurveyor ensures that the condition has been rectified beforethe survey has been completed.

808 DNV may at any time alter a condition, memorandum orinformation if this is considered appropriate.

B 900 Survey reports and survey status901 The surveyor will prepare and submit to the owner re-ports on all surveys which have been carried out and issue CCand MO, when relevant.

902 DNV will make available survey and certificate statusreports, to owners, via the DNV Internet website. It is the own-er’s responsibility to obtain this information from the DNV In-ternet website. Survey and certificate status reports, on paper,

will be distributed by special request, only.

C. Validity and Issuance of the Classification Certificate

C 100 Validity of the certificate101 When the renewal surveys for hull, machinery installa-tions and equipment have been satisfactorily completed, thevalidity of the classification certificate will be extended by theattending surveyor.

102 When the administration of DNV has examined the sur-veyor's report and is satisfied that the applicable requirementshave been met, the retention of class will be confirmed by theissuance of a new classification certificate.

103 The validity of the classification certificate given in 102will be 5 years, provided that the annual and intermediate sur-veys are carried out at intervals and within the time windowsrequired by the rules.

C 200 Issuance of certificate201 For renewal surveys completed within 3 months beforethe expiry date of the existing certificate, the new certificatewill be valid to a date not exceeding 5 years from the expirydate of the existing certificate.

202 For renewal surveys completed after the expiry date ofthe existing certificate, the new certificate will be valid to adate not exceeding 5 years from the expiry date of the existingcertificate.

203 For renewal surveys completed more than 3 months be-fore the expiry date of the existing certificate, the new certifi-cate will be valid to a date not exceeding 5 years from thecompletion date of the renewal survey.

204 In cases where postponement has been granted, the newcertificate will be valid to a date not exceeding 5 years from theexpiry date of the existing certificate before postponement wasgranted.

205 In cases where the renewal surveys are carried out con-currently with major conversions and/or alterations requiring along conversion time, the validity of the new certificate willnormally be 5 years from the date of the completion and/or al-teration.

D. Suspension and Withdrawal of Class

D 100 General101 DNV may suspend or withdraw class in cases where theassumptions as the basis for classification, or the provisions forretention of class, have been violated.

102 The decision to suspend or withdraw class is made bythe administration of DNV. However, in cases of automaticsuspension, no individual decision is made. Suspension orwithdrawal of class may take effect immediately or after aspecified period of time.

103 If the owner's default only affects conditions related tospecial notations, the suspension or withdrawal may be limitedto these class notations only.

104 When it is considered that an owner’s failure to complywith the rule requirements is sufficiently serious or fraudulentthe suspension or withdrawal of class may, at the discretion ofDNV, be extended to include other units controlled by thesame owner.

D 200 Suspension of class201 If the renewal surveys for hull, machinery installations

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and equipment related to main character of class are not carriedout before the expiry date of the classification certificate, andif no postponement has been granted, the class will be automat-ically suspended with immediate effect unless the surveys areunder completion.

202 If the annual or intermediate surveys are not carried outwithin 3 months from the anniversary date of the classificationcertificate the class is automatically suspended with immediateeffect.

203 DNV may further decide to suspend class if the unit isnot submitted to the required periodical surveys also in caseswhen this is due to force majeure cases, for instance a majorcasualty.

204 In addition to the conditions laid down in 201, 202 and203 main class or additional class notations may also be sus-pended with immediate effect by the administration of DNV incases where repair of deficiencies have not been dealt with inan appropriate manner within the time limits given by the sur-veyor.

205 Where a suspension of class has come into effect DNVwill:

— notify the owner in writing— notify the proper authorities in the country where the unit

is registered— make an entry to this effect in the “Register of vessels

classed with DNV”.

D 300 Withdrawal of class301 The class will be withdrawn at the owner's request.

302 If the outstanding surveys specified in 201, 202 and 203or required repairs as given in 204 are not carried out within aspecified time after the class suspension, DNV may decide towithdraw class.

303 If a unit proceeds to sea without having rectified a con-dition of class which was required to be dealt with before leav-ing port, the class will be withdrawn with immediate effect.

304 If the outstanding debt owed to DNV is not paid withina fixed date, DNV may withdraw class with one month's writ-ten notice. This also applies when the obligation to pay restswith a yard or with previous owners. In special cases a shorternotice may be given.

305 If the owner makes a general assignment for the benefitof his creditors or if any proceedings are commenced in courtor any order or judgement is given by any court for a liquida-

tion, winding up of the owner, DNV may withdraw the classwith immediate effect.

306 Where a withdrawal of class has come into effect DNVwill:

— notify the owner in writing— notify the proper authorities in the country where the unit

is registered— make an entry to this effect in the “Register of vessels

classed with DNV”.

D 400 Reclassification

401 If the outstanding surveys leading to class suspension asgiven in 201, 202 and 203 or required repairs as given in 204are carried out within a specified time and the result of this sur-vey is such that no condition of class is given and furthermorethat there is no overdue periodical surveys or conditions ofclass at that time, the class will be reinstated and the existingclassification certificate retains its validity.

402 In all other cases than that given in 401, and if the cir-cumstances leading to withdrawal of class no longer exist,class may only be reinstated based upon a written request fromthe owner. The survey extent will in such instances be depend-ent upon the classification status at the time of suspension orwithdrawal.

403 When the surveyor is satisfied that the applicable re-quirements given in 402 have been met, he will issue a certifi-cate of interim class which will remain valid until theadministration of DNV has confirmed the class and issued theclassification certificate.

404 When the class is reinstated, DNV will confirm the rein-statement in writing to the owners and to the authorities in thecountry where the unit is registered and make the informationavailable to any third party upon request.

E. Appeals

E 100 Decisions taken by DNV

101 The client may request that a decision by DNV is to betaken up for reconsideration by one or more surveyors special-ly appointed. The expenses incurred are to be paid by the partymaking the appeal. If the earlier decision is revoked, the ex-penses will be covered by DNV.

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SECTION 5LEGAL PROVISIONS

A. Liability and Jurisdiction

A 100 Limited liability101 If any person suffers loss or damage which is proved tohave been caused by any negligent act or omission of DNV,then DNV shall pay compensation to such person for hisproved direct loss or damage. However, the compensationshall not exceed an amount equal to ten times the fee chargedfor the service in question, provided that the maximum com-pensation shall never exceed USD 2 million.

In this provision "DNV " shall mean the Foundation Det Nor-ske Veritas as well as all its subsidiaries, directors, officers,

employees, agents and any other acting on behalf of Det Nor-ske Veritas.

A 200 Governing law

201 These rules, the classification of the unit and the rela-tionship between DNV and other parties shall be governed byNorwegian law.

A 300 Venue

301 Any dispute arising in relation to or as a consequence ofthese rules shall only be resolved by the courts of Norway, theMunicipal Court of Oslo being the proper venue.

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CHAPTER 2

DESIGN AND CONSTRUCTION PROVISIONS

CONTENTS PAGE

Sec. 1 Design and Construction Requirements for 1A1 MOU Main Class............................................ 29Sec. 2 Supplementary Requirements for Service Notation Drilling Unit............................................... 33Sec. 3 Supplementary Requirements for Service Notation Well Intervention Unit ................................. 35Sec. 4 Supplementary Requirements for Service Notation Accommodation Unit.................................. 37Sec. 5 Supplementary Requirements for Service Notation Crane Unit................................................. 39Sec. 6 Design and Construction Requirements for System and Special Facility Notations ............... 40

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SECTION 1DESIGN AND CONSTRUCTION REQUIREMENTS FOR

1A1 MOU MAIN CLASS

A. General

A 100 Introduction

101 This section identifies design and construction require-ments common to all types of mobile offshore units. Unitscomplying with these requirements will be assigned a maincharacter of class 1A1 followed by a description of the basicdesign concept of the unit, e.g. column-stabilised unit.

102 The following discipline areas are covered within mainclass:

— safety principles and arrangement— materials— hull design and fabrication— emergency and temporary mooring and towing— stability, watertight and weathertight integrity— marine and machinery systems and equipment— electrical systems and equipment— instrumentation and telecommunication systems— fire protection.

103 Systems and structures will be certified or classifiedbased on the following main activities:

— design approval— certification of materials and components— survey during construction and installation— survey during commissioning and start-up.

Further description of activity procedures are given in Ch.1Sec.4.

104 The requirements of this section are given as:

— references to standards, codes and rules containing techni-cal requirements which shall be complied with for assign-ment of main class

— documentation requirements for classification— supplementary requirements which shall be applied in

conjunction with the technical reference documents for as-signment of class

— requirements for certification of materials and compo-nents.

A 200 Technical reference documents

201 Technical requirements are given by reference to select-ed:

— DNV offshore standards— DNV recommended practices— other DNV rules and standards— internationally recognised codes and standards.

202 The technical reference documents which shall be ap-plied are given in the following subsections and are summa-rised in Table L1.

A 300 General assumptions

301 Any deviations, exceptions and modifications to the de-sign codes and standards given as reference documents shall bedocumented and approved by DNV.

302 Where referred codes and standards call for the extent ofinspections and tests to be agreed between contractor, manu-facturer and client, the resulting extent is to be agreed withDNV.

DNV may accept alternative solutions found to represent anoverall safety level equivalent to that stated in the requirementsof this document or the referred standards.

A 400 Documentation401 Documentation required for review and approval is giv-en by DNV-RP-A201 and DNV-RP-A202.

402 For assignment of main class 1A1, documents markedwith class notation 1A1 in DNV-RP-A202 shall be submitted.

403 Detailed document requirements for the individual tech-nical discipline areas are given in the relevant subsections.

B. Safety Principles and Arrangement

B 100 General101 Safety principles and arrangement include the followingdiscipline areas:

— design principles, including generic accidental loads — arrangement; including segregation of areas and location

of plants and equipment— escape and evacuation.

B 200 Design principles201 The requirements given in DNV-OS-A101, Sec.1 andSec.2, shall be complied with.

B 300 Arrangement301 Arrangement of the unit shall be in accordance with therequirements of DNV-OS-A101, Sec.3.

B 400 Escape and evacuation401 Escape and evacuation shall be in accordance withDNV-OS-A101, Sec.6.

B 500 Documentation requirements501 Documents listed in DNV-RP-A202 marked with classnotation 1A1 under the following CIBS (Classification Infor-mation Breakdown Structure) codes shall be submitted for re-view:

— 20 Hull and structure general— 210 Compartments— 301 Engine room— 350 Accommodation general— 380 Vessel safety general— 386 Means of escape— 388 Evacuation and life-saving.

C. Materials

C 100 Technical requirements101 Materials for:

— rolled steel for structural applications, boilers and pressurevessels

— steel tubes, pipes and fittings— steel forgings— steel castings— aluminium alloys

✠

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shall comply with the requirements given by DNV-OS-B101unless otherwise stated in the relevant technical reference doc-uments.

C 200 Supplementary classification requirements

201 Certification requirements for materials are given inDNV-OS-B101, Ch.3.

D. Structural Design

D 100 Technical requirements

101 Structural design shall comply with the following designcodes depending on hull shape and applied design methodolo-gy.

102 Ship-shaped structures shall comply with DNV-OS-C102.

103 Column-stabilised structures shall comply with DNV-OS-C103 when applying the LRFD methodology.

Alternatively the design shall comply with DNV-OS-C201when applying the WSD methodology.

104 Self-elevating structures shall comply with DNV-OS-C104 when applying the LRFD methodology.

Alternatively the design shall comply with DNV-OS-C201when applying the WSD methodology.

D 200 Documentation requirements

201 Documents listed in DNV-RP-A202 marked with classnotation 1A1 under the following CIBS codes shall be submit-ted for review:

— 221 Ship structural design — 222 Column-stabilised unit structural design— 223 Self-elevating unit structural design.

E. Fabrication and Testing of Offshore Struc-tures

E 100 Technical requirements

101 Requirements for:

— welding procedures and qualification of welders— fabrication and tolerances— testing — corrosion protection systems

shall be in accordance with DNV-OS-C401.

E 200 Documentation requirements

201 Documentation listed in DNV-RP-A202 marked withclass notation 1A1 under the following CIBS codes shall besubmitted for review:

— 230 Materials.

E 300 Supplementary classification requirements

301 Classification procedures specifically related to fabrica-tion and testing of offshore structures are given in DNV-OS-C401, Ch.3.

F. Stability and Watertight/Weathertight Integrity

F 100 Technical requirements

101 Requirements for:

— intact and damaged stability— watertight integrity— freeboard— weathertight closing appliances

shall be in accordance with DNV-OS-C301.

F 200 Documentation requirements


— 26 Openings and closing appliances— 28 Stability and loadline.

G. Mooring and Towing

G 100 General

101 Depending on type of unit, main class stipulates require-ments for:

— temporary mooring— emergency mooring— towing.

102 For units with the additional class notation POS-MOOR, the requirements for emergency and temporary moor-ing are normally covered within this notation.

103 For units with the additional class notations DYNPOS-AUTS, DYNPOS-AUT, DYNPOS-AUTR, DYNPOS-AU-TRO for dynamic positioning, the requirements for emergencyand temporary mooring given below shall be complied with.

104 If required by flag administrations, DNV can performcertification of the complete mooring equipment according tothe POSMOOR notation or the relevant national regulations.

G 200 Ship-shaped units

201 Ship-shaped units shall have an arrangement for tempo-rary mooring complying with the Rules for Classification ofShips, Pt.3 Ch.3 Sec.2.

202 Equipment for drilling barges will be considered in eachcase.

G 300 Column-stabilised units

301 Column-stabilised units shall have an arrangement fortemporary and emergency mooring complying with DNV-OS-E301, Ch.3.

G 400 Self-elevating units

401 Self propelled self-elevating units shall have an arrange-ment for temporary and emergency mooring complying withDNV-OS-E301, Ch.3.

G 500 Towing

501 All type of units shall have arrangement and devices fortowing complying with DNV-OS-E301, Ch.2.

G 600 Documentation requirements


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— 241 Anchoring— 242 Mooring— 243 Towing.

G 700 Supplementary classification requirements701 Classification procedures specifically related to moor-ing and towing are given in DNV-OS-E301, Ch.3.

702 Certification requirements for equipment are given inDNV-OS-E301, Ch.3.

H. Marine and Machinery Systems and Equipment

H 100 Technical requirements101 Requirements for marine and machinery systems andequipment include:

— general piping design, fabrication and testing— pumps, valves and pipe connections— ballast, bilge and drainage systems— air, overflow and sounding pipes— cooling, feed water and condensation systems— lubricating oil, fuel oil and thermal oil systems— hydraulic, steam and pneumatic systems— heating, ventilation and air conditioning systems— propulsion and auxiliary machinery including thrusters— boilers, pressure vessels and incinerators— anchoring and mooring equipment— steering, jacking gear and turret machinery

and shall be designed, manufactured, tested and installed in ac-cordance with DNV-OS-D101.

Guidance note:Recognised codes and standards which can be applied for pipingand equipment are listed in DNV-OS-D101.


102 Units not equipped with propulsion and steering ar-rangements for independent transit will be given the specialfeature notation NON-SELFPROPELLED, and shall complywith DNV-OS-D101 as applicable for such type of units.

H 200 Documentation requirements201 Documents listed in DNV-RP-A202 marked with classnotation 1A1 under the following CIBS codes shall be submit-ted for review:

— 24 Anchoring, mooring and towing— 30 Machinery, marine systems and safety, general— 31 Propulsion— 32 Steering— 34 Machinery systems— 36 Marine systems.

H 300 Supplementary classification requirements301 Classification procedures specifically related to marineand machinery systems and equipment are given in DNV-OS-D101, Ch.3.

302 Certification requirements for equipment are given inDNV-OS-D101, Ch.3.

I. Electrical Systems and Equipment

I 100 Technical requirements101 Electrical systems and equipment include:

— system design

— switchgear and control gear assemblies— rotating machinery— static converters— cables— miscellaneous equipment— installation and testing— A.C. supply systems— electric propulsion


I 200 Documentation requirements201 Documents listed in DNV-RP-A202 marked with classnotation 1A1 under the following CIBS codes shall be submit-ted for review:

— 33 Electrical power.

I 300 Supplementary classification requirements301 Classification procedures specifically related to electri-cal systems and equipment are given in DNV-OS-D201.

302 Certification requirements for equipment are given inDNV-OS-D201.

J. Instrumentation and Telecommunication Systems

J 100 Technical requirements101 Instrumentation and telecommunication systems andequipment include:

— design principles and system design— computer based systems— component design and installation— environmental conditions— user interface


J 200 Documentation requirements201 Documents listed in DNV-RP-A202 marked with classnotation 1A1 under the following CIBS codes shall be submit-ted for review:

— 37 Navigation, communication, integrated and specialcontrol.

J 300 Supplementary classification requirements301 Classification procedures specifically related to instru-mentation and telecommunication systems are given in DNV-OS-D202, Ch.3.

Certification requirements for equipment are given in DNV-OS-D202, Ch.3.

K. Fire Protection

K 100 Technical requirements101 Fire protection include:

— passive fire protection— active fire protection— fire fighting systems— fire and gas detection systems

and shall be designed, manufactured, tested and installed in ac-cordance with DNV-OS-D301, Sec.1 to Sec.6.

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K 200 Documentation requirements201 Documents listed in DNV-RP-A202 marked with classnotation 1A1 under the following CIBS codes shall be submit-ted for review:

— 380 Vessel safety general— 381 Fire and explosion prevention— 382 Fire resistance— 383 Fire detection, alarm and automatic actions— 385 Fire fighting.

K 300 Supplementary classification requirements301 Classification procedures specifically related to fire pro-

tection are given in DNV-OS-D301, Ch.3.

302 Certification requirements for equipment are given inDNV-OS-D301, Ch.3.

L. Summary of Technical Reference Standards

L 100 General

101 Technical standards which shall be applied for assign-ment of main character of class for mobile offshore units aresummarised in Table L1.

Table L1 Technical reference standards for main character of class (1A1 MOU)Technical item Reference standard Applicable parts or comments

SAFETY PRINCIPLES AND ARRANGEMENT

Design principles DNV-OS-A101

Sec.1: GeneralSec.2: Design Principles and Assessment

Arrangement Sec.3: ArrangementEscape and evacuation Sec.6: Escape and Evacuation

MATERIALSMetallic materials DNV-OS-B101

STRUCTURAL DESIGN (select type as appropriate)Ship-shape structure DNV-OS-C102

Column-stabilised type structureDNV-OS-C103 LRFD methodologyDNV-OS-C201 WSD methodology

Self-elevating type structureDNV-OS-C104 LRFD methodologyDNV-OS-C201 WSD methodology

HULL FABRICATIONFabrication, including welding and NDT DNV-OS-C401 Covers all types of structures

STABILITY AND WATERTIGHT INTEGRITYStability, watertight integrity, freeboard and weathertight closing appliances

DNV-OS-C301 Covers all types of structures

MOORING AND TOWING

Temporary mooring, emergency mooring, towing Rules for Classification of Ships

Pt.3 Ch.3 Sec.2Ship-shaped units

DNV-OS-E301 All other types of units

MARINE AND MACHINERY SYSTEMS AND EQUIPMENTPiping design, manufacturing and testing; platform piping systems; machinery piping systems; machinery and me-chanical equipment

DNV-OS-D101 All sections

ELECTRICAL SYSTEM EQUIPMENTElectrical systems including switchgear and controlgear as-semblies, rotating machinery, static convertors, cables, in-stallation, testing, and electric propulsion


INSTRUMENTATION AND TELECOMMUNICATION SYSTEMSInstrumentation systems including design principles, sys-tem design, computer based systems, component design and installation, and user interface


FIRE PROTECTION

Fire protection including passive fire protection, active fire protection, fire fighting systems, fire and gas detection sys-tems

DNV-OS-D301

Sec.1: IntroductionSec.2: Passive Fire Protection Sec.3: Active Fire Protection of Specific AreasSec.4: Fire Fighting SystemsSec.5: Fire and Gas Detection SystemsSec.6: Miscellaneous Items

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SECTION 2SUPPLEMENTARY REQUIREMENTS

FOR SERVICE NOTATION DRILLING UNIT

A. General

A 100 Introduction

101 This section identifies design and construction require-ments for assignment of service notation Drilling Unit.

102 The requirements in this section are supplementary tothose for main class (1A1) as stated in Sec.1.


B 100 General

101 Service notation Drilling Unit specifies additional re-quirements for:

— arrangement— area classification— shutdown— escape, evacuation and communication.

B 200 Arrangement

201 Drilling units shall comply with DNV-OS-A101, Sec.8.

B 300 Area classification

301 Drilling units shall comply with DNV-OS-A101, Sec. 4,and Sec.8.

B 400 Emergency shutdown

401 Drilling units shall comply with DNV-OS-A101, Sec. 5.

B 500 Escape, evacuation and communication

501 Drilling units shall comply with DNV-OS-A101, Sec.8.

B 600 Supplementary documentation requirements

601 Documents listed in DNV-RP-A202 marked with classnotation DRU under the following CIBS codes shall be sub-mitted for review:

— 380 Safety general — 387 Emergency operations— 70 Drilling general.

C. Structural Design

C 100 General

101 The structural strength shall be as required for the mainclass taking into account necessary strengthening of support-ing structures for equipment applied in and forces introducedby the drilling operation.

102 When calculating the structural strength of the drill floorand substructure, relevant loading conditions shall be specifiedby the builder. Loadings from drillpipe on setback, tensioningequipment hook load, rotary table etc. shall be considered.

Local effects of horizontal components of tensioner forces,drilling torque etc. shall also be considered.

C 200 Supplementary documentation requirements


— 711 Drillfloor with substructure and foundation— 712 Moonpool.

D. Instrumentation and Telecommunication Systems

D 100 Supplementary documentation requirements


— 372 Communication.

E. Fire Protection

E 100 General

101 Service notation Drilling Unit specifies additional re-quirements for:

— active fire fighting systems— passive fire protection— gas detection.

E 200 Supplementary technical requirements

201 Drilling units shall comply with DNV-OS-D301, Sec.7.

E 300 Supplementary documentation requirements

301 Documents listed in DNV-RP-A202 marked with classnotation DRU under the following codes shall be submitted forreview:

— 384 Gas detection and alarm — 70 Drilling general.

F. Summary of Requirements


101 All documents listed in DNV-RP-A202 marked withclass notation symbols 1A1 and DRU and shall be submittedfor review for units which are to be assigned service notationDrilling Unit.

F 200 Technical reference standards

201 Technical standards which shall be applied for assign-ment of service notation Drilling Unit are summarised in Ta-ble F1.

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Table F1 Summary of technical reference standards for service notation Drilling UnitTechnical item Reference standard Applicable parts or comments

Safety principles and arrangement DNV-OS-A101Sec.1 to Sec.6. (Sec.4 and Sec.5 supplementary to 1A1) Sec. 8, Special requirements for drilling units

Materials DNV-OS-B101 (No supplementary requirements to 1A1) Structural design of ship-shaped units DNV-OS-C102 (No supplementary requirements to 1A1)

Structural design of column-stabilised unitsDNV-OS-C103 LRFD methodology (No supplementary requirements to 1A1)DNV-OS-C201 WSD methodology (No supplementary requirements to 1A1)

Structural design of self-elevating unitsDNV-OS-C104 LRFD methodology (No supplementary requirements to 1A1)DNV-OS-C201 WSD methodology (No supplementary requirements to 1A1)

Structural fabrication DNV-OS-C401 (No supplementary requirements to 1A1)Stability and watertight integrity DNV-OS-C301 (No supplementary requirements to 1A1)

Mooring and towing

Rules for Classification of

Ships Pt.3 Ch.3 Sec.2

Ship-shaped units (No supplementary requirements to 1A1)

DNV-OS-E301 Other units (No supplementary requirements to 1A1)Marine and machinery systems and equipment DNV-OS-D101 (No supplementary requirements to 1A1)Electrical systems and equipment DNV-OS-D201 (No supplementary requirements to 1A1) Instrumentation and telecommunication systems DNV-OS-D202 (No supplementary requirements to 1A1)

Fire protection DNV-OS-D301Sec.1 to Sec.6 (1A1 requirements)Sec.7, Supplementary requirements for drilling units

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SECTION 3SUPPLEMENTARY REQUIREMENTS FOR SERVICE NOTATION

WELL INTERVENTION UNIT

A. General

A 100 Introduction101 This section identifies design and construction require-ments for assignment of service notation Well InterventionUnit.102 Well intervention units are ship-shaped or column-stabi-lised units equipped for performing:

— wireline intervention (without riser) of subsea wells (cate-gory I); and/or

— coiled tubing of subsea wells (through a riser) (categoryII).

103 Units equipped for performing wireline interventionwithout introducing well fluids on board will be assigned classnotation Well Intervention Unit – I.104 Units intended and equipped for direct contact with wellfluids will be assigned class notation Well Intervention Unit– II.105 The requirements in this section are supplementary tothose for main class (1A1).

B. Requirements for Well Intervention Unit – I

B 100 Equipment101 The following well intervention systems and equipmentshall be certified by DNV(as applicable):

— wireline unit including power pack— subsea wireline lubricator assembly— BOP wireline shear-ram— grease injection skid for braided line and stuffing box for

slickline— line pressure control head— wireline winch— skids or carriers for handling of equipment— umbilicals for subsea controls— downhole tools including depth and weight indicator sys-

tem.

102 Well intervention equipment and systems shall meettechnical requirements and be subject to certification as de-scribed in DNV-OS-E101.

103 Documentation listed in DNV-RP-A202 marked withclass notation DRILL shall be submitted for review (as appli-cable for the individual installation).

B 200 Dynamic positioning system201 Units with the notation Well Intervention Unit - Ishall as a minimum comply with the class notation AUTR.

202 Requirements for AUTR is given in Ch.2 Sec. 6.

C. Requirements for Well Intervention Unit – II

C 100 General101 Service notation Well Intervention Unit - II specifiesadditional requirements for:

— area classification— shutdown— escape, evacuation and communication.

C 200 Area classification

201 Units shall comply with DNV-OS-A101, Sec.4, andSec.8, as applicable for well intervention units.

C 300 Emergency shutdown301 Units shall comply with DNV-OS-A101, Sec.5, andSec.8, as applicable for well intervention units.

C 400 Escape, evacuation and communication

401 Units shall comply with DNV-OS-A101, Sec.8, as ap-plicable for well intervention units.

C 500 Supplementary documentation requirements


— 380 Vessel safety general— 387 Emergency operations.

D. Fire Protection

D 100 General101 Service notation Well Intervention Unit - II specifiesadditional requirements for:

— active fire fighting systems— passive fire protection— gas detection.

D 200 Supplementary technical requirements

201 Units shall comply with DNV-OS-D301, Sec.7, as ap-plicable for well intervention units.

D 300 Supplementary documentation requirements

301 Documents listed in DNV-RP-A202 marked with classnotation DRU under the following codes shall be submitted forreview:

— 384 Gas detection, alarm and automatic actions.

D 400 Supplementary classification requirements401 It is assumed that the unit is self-contained during oper-ation, i.e. there is no need to transfer stores and equipmentfrom supply vessels.

402 If the unit is equipped with tanks for carriage of liquidcargo in bulk with flash point below 60ºC, such as crude oil,the requirements in the Rules for Classification of Ship Pt.5Ch.3, shall be complied with.

403 Reception tanks for handling of hydrocarbons shall belocated taking into account the risk of fire and hydrocarbonleakages.

404 Due care shall be taken to avoid entrapment of gas dueto a subsea gas leakage.

405 A simplified shutdown hierarchy may be applied ifagreed between the yard and the owner.

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406 Means shall be provided for rescue of personnel fallinginto the moonpool. The moonpool shall be fitted with a rescueladder.

407 Means, including piping arrangement shall be providedfor the dumping of liquid mud where this is an assumption forapproval of the unit’s stability.

408 Machinery and other equipment necessary for the wellintervention which are to be installed in hazardous areas shallbe suitable for the intended purpose.

409 Internal combustion engines shall not be installed inhazardous areas.

410 Air intakes for combustion engines shall be taken mini-mum 3 m from the hazardous areas.

411 Exhaust outlets for internal combustion engines andboilers shall be fitted with efficient spark arresting devices andshall discharge outside the hazardous areas.

D 500 Well intervention systems and equipment

501 Service notation Well Intervention Unit - II includesrequirements for the following well intervention systems andequipment (as applicable):

Coiled tubing

— subsea coiled tubing lubricator— BOP coiled tubing shear-ram— riser— coiled tubing reel— injector head— coiled tubing.

Snubbing equipment

— jack— guide tube system— circulating swivel.

General systems and equipment

— surface flow tree including tension frame— workover riser (mono or dual bore)— lifting tower and well-servicing derrick— lifting equipment— skids or carriers for handling of equipment— high pressure pumping facilities (cement, well stimulation

fluids, nitrogen)— hydrocarbon handling — Emergency Disconnect Package (EDP)— Lower Riser Package (LRP)— umbilicals for subsea controls— downhole tools including depth and weight indicator sys-

tem.

502 Well intervention equipment and systems shall meettechnical requirements and be subject to certification as de-scribed in DNV-OS-E101.

503 Documentation listed in DNV-RP-A202 marked withclass notation DRILL shall be submitted for review (as appli-cable for the individual installation).

D 600 Dynamic positioning system601 Service notation Well Intervention Unit - II shall as aminimum have the class notation DYNPOS-AUTRO.

602 Requirements for DYNPOS-AUTRO are given inSec.6.

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ACCOMMODATION UNIT

A. General

A 100 Introduction101 This section identifies design and construction require-ments for assignment of service notation AccommodationUnit.102 Accommodation units are offshore units primarily in-tended for accommodation of offshore personnel.

103 The service notation Accommodation Unit is manda-tory for classification of units primarily intended for accom-modation of offshore personnel.

104 The requirements in this section are supplementary tothose for main class as stated in Sec.1.


B 100 Arrangement of emergency power101 The emergency switchboard shall be installed as near tothe emergency source of power as is practicable.

102 Where the emergency source of power is a generator, theemergency switchboard shall be located in the same space asthe emergency source of power, unless the operation of theemergency switchboard would thereby be impaired.

103 No accumulator battery fitted in accordance with E102shall be installed in the same space as the emergency switch-board.

C. Structural Strength

C 100 General101 Service notation Accommodation unit includes re-quirements for the following:

— structural strength of the accommodation— connection of the accommodation modules to main struc-

ture— gangways.

C 200 Design loads201 Structural strength shall be as required for main class as-suming design loads for accommodation deck as for crewspaces or weather deck whichever is applicable.

C 300 Containerised modules301 If containerised modules are used for accommodation,the structural strength of the connections between the modulesand between the modules and the supporting structure shall bein accordance with the general requirements given for the mainclass, assuming forces as given for heavy units in DNV-OS-C103, Sec.3, E400.

302 For column-stabilised units the horizontal force shall notbe taken less than:

Permissible usage factors are given in DNV-OS-C201, Sec.2Table E2.

C 400 Gangways401 Gangways shall be made of slip-proof open grating, beat least 600 mm wide and have railings at least 1 m high.

402 Environmental conditions (sea, weather, wind etc.) shallbe considered for the design of gangways. Gangways shall bedimensioned for 4 kN/m2. Allowed bending shall be maximum1/250 between the points of support.

D. Stability and Watertight Integrity

D 100 General101 There are no additional requirements to main class asgiven in Sec.1.

E. Electrical Systems and Equipment

E 100 Emergency source of power and emergency installation101 The emergency power supply and emergency lightingshall be operable and capable of being used in the damagedconditions described in DNV-OS-C301.

102 Where the emergency source of power is a generator, atransitional source of emergency power shall be installed. Thisshall be an accumulator battery of sufficient capacity:

— to supply emergency lighting continuously for 30 minutes— to close the watertight doors (if electrically operated), but

not necessarily to close them simultaneously— to operate the indicators (if electrically operated) which

show whether power operated, watertight doors are openor closed

— to operate the sound signals (if electrically operated)which give warning that power operated, watertight doorsare about to close

— to operate the fire detection and alarm systems, unlessthese systems are supplied by separate batteries.

103 Arrangements shall be such that the transitional sourceof emergency power will come into operation automatically inthe event of failure of the main electrical supply.

104 Where the emergency source of power is an accumulatorbattery, arrangements shall be such that emergency lightingwill automatically come into operation on failure of the mainlighting supply.

105 An indicator shall be fitted in the control room, prefera-bly in the main switchboard, to indicate when any accumulatorbattery fitted in accordance with this rule is being discharged.

106 The emergency switchboard may be supplied from themain switchboard during normal operation.

F. Mooring

F 100 General101 Accommodation units shall have the class notation

M = mass of unit in tα = angle of heel corresponding to loss of buoyancy of

one column.

PH α g0M (kN)sin=

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POSMOOR-V or DYNPOS-AUTRO. F 200 Documentation and technical requirements201 Requirements for POSMOOR-V or DYNPOS-AUTRO are given in Sec.6.

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CRANE UNIT

A. Introduction

A 100 Objective

101 This section identifies design and construction require-ments for assignment of service notation Crane Unit.

102 Crane units are column-stabilised or self-elevating unitsspecially intended for lifting purposes.

103 The requirements for main class 1A1, as stated in Sec.1shall be complied with in addition to the supplementary re-quirements for Crane Unit listed in this section.

A 200 Documentation requirements

201 All documents listed in DNV-RP-A202 marked withclass notations 1A1 shall be submitted for review for unitswhich are to be assigned service notation Crane Unit.

202 Additionally, the following documents giving informa-tion about the following aspects shall be submitted:

— location of crane during operation and in parked position,with information of forces which will be transferred to thestructure

— supporting structures (including pedestal if installed) andstrengthening of deck structure in way of supports

— arrangement of rack bar (toothed bar) with details of sup-ports

— devices for locking the parked crane to the hull (unit at sea)— electrical installation of the crane— operating manual with information on the unit’s stability

and floatability in all operating modes— stability and floatability calculations— dynamic load charts for the crane— principal dimensions of the crane and limiting positions of

its movable parts.

B. Structural Design

B 100 General

101 The following is covered by the service notation:

— structural details relating to the lifting operations. Dynam-ic forces due to lifting operations and motions characteris-tics of the unit shall be taken into account

— supporting structures for the crane and strengthening ofthe deck structure

— devices for locking the crane in parked position (unit atsea).

B 200 Technical requirements

201 The hull structural strength shall in general be as re-quired for main class taking into account necessary strengthen-ing for supporting the crane(s). Crane units shall comply withthe requirements of the Rules for Classification of Ships, Pt.5Ch.7 Sec.8.

C. Stability and Watertight Integrity

C 100 Technical requirements

101 The requirements of the Rules for Classification ofShips, Pt.5 Ch.7 Sec.8, shall be complied with.

D. Certification of Materials and Components

D 100 Certification requirements

101 The crane(s) shall be delivered with certificates in com-pliance with the Rules for Certification of Lifting Appliances.

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SECTION 6DESIGN AND CONSTRUCTION REQUIREMENTS FOR SYSTEM

AND SPECIAL FACILITY NOTATIONS

A. Introduction

A 100 General

101 This section identifies design and construction require-ments for assignment of additional class notations relating tosystem, equipment and special facility installations.

102 Units fitted with systems and/or special facilities com-plying with relevant requirements of this section may be as-signed class notations as described in Table A1.

A 200 Technical reference documents

201 Technical requirements are given by reference to select-ed:

— DNV offshore standards— DNV recommended practices— other DNV rules and standards— internationally recognised codes and standards.

202 The technical reference documents which shall be ap-plied are given in the following subsections and summarised inTable S1.

A 300 General assumptions

301 DNV may accept alternative solutions found to repre-sent an overall safety level equivalent to that stated in the re-quirements of this document or referred standards.

302 The requirements stated in this section for additionalclass notations shall be regarded as supplementary to thosegiven for assignment of main class and relevant service nota-tions.

A 400 Documentation

401 Documentation required for review and approval is stat-ed in DNV-RP-A201 and DNV-RP-A202.

402 Documentation with the relevant class notation abbrevi-ation code shall be submitted.

403 Detail document requirements for the individual classnotations are given under the relevant subsections.

B. Position Mooring System

B 100 General

101 POSMOOR notation may be assigned to units fittedwith single or spread point mooring systems in accordancewith the requirements of this section.

102 The notation is complemented with the symbols -V, -TAor -ATA as described in Table B1.

103 The notations aim to cover the reliability of the mooringsystem and equipment, for the purpose of ensuring safe posi-tion mooring, and covers the following aspects:

— environmental conditions and loads— mooring system analysis— thruster assisted mooring— mooring equipment— tests.

B 200 Technical requirements

201 The technical requirements of DNV-OS-E301 shall becomplied with for assignment of the POSMOOR notations.

B 300 Documentation requirements

301 Documents listed in DNV-RP-A202 marekd with classnotation POSMOOR and POSMOOR-ATA (as applicable)shall be submitted for review.

B 400 Certification of materials and components

401 Certification of equipment shall be in accordance withDNV-OS-E301, Ch.3.

Table A1 Additional system and special facility notationsNotation DescriptionPOSMOOR POSMOOR-VPOSMOOR-TA or POSMOOR-ATA

Unit equipped with position mooring sys-tem

DYNPOS-AUTSDYNPOS-AUTDYNPOS-AUTR or DYNPOS-AUTRO

Unit equipped with dynamic positioning

DRILL Unit equipped with drilling facilityHELDK, HELDK-S or HELDK-SH Unit equipped with helicopter deck

WELLTEST Unit equipped with facilities for well testingTEMPSTORE Unit arranged and equipped for temporary

(in-field) storage of oilCRANE Unit equipped with craneDSV-I SF, DSV-II SF or DSV-III SF Unit equipped with diving system

DEICE or DEICE-C Unit equipped with de-icing/anti-icing sys-tems

E0 Unit equipped for unattended machinery space

ECO Unit equipped for operation of machinery from centralised control station

F-A, F-M or F-AM Unit constructed with additional fire protec-tion

FIRE FIGHTER IFIRE FIGHTER II or FIRE FIGHTER III

Unit arranged and equipped for fighting fires on offshore and onshore structures

ICS Unit equipped with integrated computer system

HMON-1 or HMON-2

Unit equipped with systems for monitoring hull behaviour

ICE-T or ICE-L

Units strengthened for ice transit and opera-tion

SBM Unit with implemented management system

Table B1 POSMOOR class notationsNotation DescriptionPOSMOOR Passive position mooring systemPOSMOOR-V Mooring system designed for positioning in

vicinity of other structures POSMOOR-TA Thruster assisted mooring system depend-

ent on manual remote thrust control systemPOSMOOR-ATA Thruster assisted mooring system depend-

ent on automatic remote thrust control sys-tem

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C. Dynamic Positioning Systems

C 100 General

101 The following notations may be assigned to units withdynamic positioning systems: DYNPOS-AUTS, DYNPOS-AUT, DYNPOS-AUTR or DYNPOS-AUTRO according toextent of requirements applied.

102 The various notations depend on the dynamic position-ing system layout and configuration as given in Table C1.

103 The dynamic positioning system includes requirementsfor the following subsystems, control panels and back-up sys-tems which are necessary to dynamically position the unit:

— power system— controller— measuring system— thruster system— remote thrust control— control panels.

C 200 Technical requirements

201 Technical requirements for the dynamic positioning no-tations shall be in accordance with the Rules for Classificationof Ships Pt.6 Ch.7.

C 300 Documentation requirements

301 Documents listed in DNV-RP-A202 marked with classnotation DYNPOS, DYNPOS-AUTS, DYNPOS-AUT,DYNPOS-AUTR or DYNPOS-AUTRO (as applicable)shall be submitted for review.

D. Drilling Plant

D 100 General

101 DRILL notation covers design and operational aspectsof offshore drilling facilities which have potential to affectsafety of personnel or pollution of the environment.

102 DRILL include specific requirements relating to:

— design principles— drilling systems and equipment— materials and welding— piping— electrical and control systems— instrumentation component design and installation— user interface (optional)— manufacture, workmanship, testing and maintenance.

D 200 Technical requirements

201 The requirements for drilling facilities are stated inDNV-OS-E101.

D 300 Documentation requirements

301 Documents listed in DNV-RP-A202 marked with classnotation DRILL shall be submitted for review.

D 400 Certification of materials and components

401 Procedures and requirements for classification includingcertification of equipment shall be in accordance with DNV-OS-E101, Ch.3.

E. Helicopter Decks

E 100 General

101 Units fitted with erected landing platforms for helicop-ters or landing areas arranged directly on decks or top of deck-houses may be given the class notations HELDK orHELDK-S or HELDK-SH.

102 The various notations are related to the extent of require-ments as given in Table E1.

E 200 Technical requirements

201 Technical requirements for HELDK shall comply withDNV-OS-E401, Ch.2, as applicable:

— Sec.1 to Sec. 4 for notation HELDK— Sec.1 to Sec. 5 for notation HELDK-S— Sec.1 to Sec. 6 for notation HELDK-SH.

E 300 Documentation requirements

301 Documents listed in DNV-RP-A202 marked with classnotation HELDK, -S and -SH (as applicable) shall be submit-ted for review.

F. Well Testing Facilities

F 100 General

101 Units equipped with facilities for well testing may be as-signed class notation WELLTEST.

102 WELLTEST is intended for limited testing of wells inrelation to drilling activities, and is applicable for units havingservice notation Drilling Unit.

F 200 Technical requirements

201 The requirements given in DNV-OS-E101, Ch.2 Sec.5H, shall be complied with.


301 Documents listed in DNV-RP-A202 marked with classnotation PROD shall be submitted for review (as applicable).

F 400 Certification of materials and components

401 Components subject to certification are given in DNV-OS-E101, Ch.3.

Table C1 DYNPOS class notationsNotation DescriptionDYNPOS-AUTS Dynamic positioning system without redun-

dancyDYNPOS-AUT Dynamic positioning system with an inde-

pendent joystick back-up and a position ref-erence back-up

DYNPOS-AUTR Dynamic positioning system with redun-dancy in technical design and with an inde-pendent joystick back-up

DYNPOS-AUTRO Dynamic positioning system with redun-dancy in technical design and with an inde-pendent joystick back-up. Plus a back-up dynamic positioning control system in an emergency dynamic positioning control centre, designed with physical separation for components that provide redundancy

Table E1 HELDK class notationsNotation DescriptionHELDK Structural strength HELDK-S Strength and unit safetyHELDK-SH Strength, unit safety and helicopter safety

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G. Temporary Oil Storage Facilities

G 100 General

101 Units arranged and equipped with facilities for tempo-rary storage of oil in relation to drilling or well testing activi-ties may be assigned class notation TEMPSTORE.

102 The following conditions apply for assignment ofTEMPSTORE:

1) The notation applies to units with drilling as main activity;i.e. the unit is to have service notation Drilling Unit.

2) Well testing and crude storage shall be undertaken on-board the drilling unit; transfer and storage of well testcrude from another unit is not allowed.

3) Transportation of crude oil is not allowed (defined as car-riage of oil from port to port or from field to shore with as-sociated discharging in port).

4) Inter-field voyages between wells can be undertaken.

103 Crude oil tanks may be arranged in pontoons and col-umns of column-stabilised units upon special consideration.

G 200 Technical requirements

201 The requirements given for Storage Units in the fol-lowing offshore standards shall be complied with as applicablefor TEMPSTORE:

— DNV-OS-A101 — DNV-OS-D101 — DNV-OS-D301.

G 300 Documentation requirements

301 Documents listed in DNV-RP-A202 marked with classnotation PSU shall be submitted for review (as applicable).

H. Crane Installations

H 100 General

101 CRANE notation may be given to units with permanent-ly installed cranes.

102 In addition to certification of the crane, the following iscovered:

— supporting structure for the crane, (strengthening of deckstructure, pedestal etc.)

— devices for locking crane in parked position (unit at sea).

103 For units intended for lifting as main service reference isalso made to the service notation Crane Unit described inSec.5.

H 200 Technical requirements

201 The requirements given in the Rules for Classification ofShips, Pt.6 Ch.1 Sec.3, shall be complied with for assignmentof class notation CRANE.

H 300 Documentation requirements

301 Document requirements listed in the Rules for Classifi-cation of Ships, Pt.6 Ch.1 Sec.3 shall be submitted for review.

H 400 Certification of materials and components

401 Cranes shall be delivered as DNV certified in accord-ance with the Rules for Certification of Lifting Appliances.

I. Diving System Installations

I 100 General

101 Units arranged for support of diving operations applyingrope and/or umbilical connection between the submerged belland the unit may be given class notations DSV-I SF or DSV-II SF or DSV-III SF as applicable depending on:

— physical size of the chambers— the life support system— control stand— communication system— capacity of the emergency power supply.

102 The various class notations are related to the maximumoperation depth dmax and maximum operation time TOP as giv-en in Table I1.

103 The class notation will cover matters of:

— the units position keeping ability during diving operations— hull structural arrangements related to the diving system,

e.g. moonpool— arrangement and installation of the diving system,— electrical systems— fire protection, detection and extinction— complete diving system with respect to safety and func-

tioning— sanitary systems (where applicable)— testing— stability and floatability.

I 200 Technical requirements

201 Assignment of DSV class notations is based on compli-ance with the Rules for Classification of Ships, Pt.6 Ch.1Sec.4.

I 300 Documentation requirements

301 Document requirements listed in the Rules for Classifi-cation of Ships, Pt.6 Ch.1 Sec.4, shall be submitted for review.

I 400 Certification of materials and components

401 The diving equipment shall be certified according to theRules for Certification of Diving Systems.

402 Cranes and other appliances for lifting of diving equip-ment and systems shall be certified according to the Rules forCertification of Lifting Appliances.

J. Additional Fire Protection

J 100 General

101 Units with additional fire safety measures in accommo-dation spaces and machinery spaces may be assigned class no-tations F-A, F-M, or F-AM.

102 The various notations are related to areas subjected to

Table I1 DSV class notationsNotation Description

DSV-I SF dmax = 125 m, TOP = 12 hrs

DSV-II SF dmax = 200 m, TOP = 48 hrs

DSV-III SF None

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additional fire protection as given in Table J1.

J 200 Technical requirements201 The requirements as stated in the Rules for Classifica-tion of Ships, Pt.6 Ch.4, shall be complied with for assignmentof the class notations.

J 300 Documentation requirements301 Document requirements listed in the Rules for Classifi-cation of Ships, Pt.6 Ch.4, shall be submitted for review.

K. Fire Fighters

K 100 General101 Units arranged and equipped for fighting fires on off-shore and onshore structures in accordance with the require-ments of this sub-section, may be assigned the class notationFIRE FIGHTER I, II or III. The numbers indicate the level ofcapability as given by Table K1.

K 200 Technical requirements201 The requirements given in the Rules for Classification ofShips, Pt.5 Ch.7 Sec.5, shall be complied with for assignmentof the class notations.

K 300 Documentation requirements301 Document requirements listed in the Rules for Classifi-cation of Ships, Pt.5 Ch.7 Sec.5, shall be submitted for review.

L. De-icing and Anti-icing Systems

L 100 General101 Units with systems for anti-icing and de-icing as speci-fied in L may be assigned class notations DEICE or DEICE-Cas applicable.

102 The notation DEICE is aimed at maintenance of the fol-lowing functions and properties of the unit and its equipmentunder icing conditions:

— main functions— manoeuvrability— stability— crew safety.

103 DEICE-C also includes facilitating of cargo deck han-dling under icing conditions.

L 200 Technical requirements201 The requirements given in the Rules for Classification ofShips, Pt.6 Ch.1 Sec.5, shall be complied with for assignmentof the class notation.

L 300 Documentation requirements

301 Document requirement listed in the Rules for Classifica-tion of Ships, Pt.6 Ch.1 Sec.5 shall be submitted for review.

M. Periodically Unattended Machinery Space

M 100 General

101 Units where all machinery in the engine room necessaryfor performance of main functions have been fitted with instru-mentation and automation systems in compliance with thissub-section, may be assigned class notation E0 or ECO.

102 E0 is assigned when machinery alarms are relayed to thebridge and engineers’ accommodation, and a central controlsystem for main propulsion machinery is fitted.

103 ECO is assigned when machinery alarms are initiated inan attended centralised control station, and a remote controlsystem for main propulsion machinery from at least this stationis fitted.

M 200 Technical requirements

201 Assignment of class notations E0 and ECO is based oncompliance with the Rules for Classification of Ships, Pt.6Ch.3, with qualifications given in 202.

202 References to the Rules for Classification of Ships, Pt.4Ch.10 (fire protection) shall be replaced with DNV-OS-D301for offshore unit application.

M 300 Documentation requirements301 Documents listed in DNV-RP-A202 marked with classnotation E0 and ECO shall be submitted for review.

N. Integrated Computer Systems

N 100 General101 Units equipped with computer based systems which arepart of, or serving the main functions of the unit, may be as-signed the class notation ICS.

N 200 Technical requirements

201 Assignment of ICS class notations is based on compli-ance with the Rules for Classification of Ships, Pt.6 Ch.5.

N 300 Documentation requirements301 Document requirements listed in the Rules for Classifi-cation of Ships, Pt.6 Ch.5, shall be submitted for review.

O. Hull Monitoring System

O 100 General101 Units equipped with instrumentation system for moni-toring hull behaviour in accordance with the requirements ofO may be assigned class notation HMON-1 or HMON-2 asgiven in Table O1.

102 The system will give warning when stress levels and thefrequency and magnitude of accelerations approach levels

Table J1 Class notations for additional fire protectionNotation DescriptionF-A Accommodation spaceF-M Machinery spaceF-AM Accommodation and machinery space

Table K1 Fire Fighter class notationsNotation Description

FIRE FIGHTER I Early stage fire fighting and rescue close to structure on fire

FIRE FIGHTER II Continuous fire fighting and cooling of struc-tures on fire

FIRE FIGHTER III As FIRE FIGHTER II, plus larger pumping capacity and more comprehensive equipment

Table O1 HMON class notationsNotation DescriptionHMON-1 Provided with basic hull monitoring system

HMON-2Provided with comprehensive hull monitoring in-corporating measurement of environmental con-ditions

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which require corrective action.

O 200 Technical requirements

201 Assignment of HMON-1 and HMON-2 class notationsis based on compliance with the Rules for Classification ofShips, Pt.6 Ch.11.

O 300 Documentation requirements

301 Documents listed in DNV-RP-A202 marked with classnotation HMON shall be submitted for review.

P. Operation in Ice Conditions

P 100 General

101 Offshore units strengthened for occasional navigationand operation in waters with light to heavy first year ice condi-tions in accordance with this sub-section may be assigned classnotations ICE-T or ICE-L as described in Table P1.

102 Column-stabilised units may be given class notationsICE-T and/or ICE-L, while self-elevating units may be giventhe ICE-T notation.

P 200 Technical requirements

201 The ice strengthening requirements given in the Rulesfor Classification of Ships, Pt.5 Ch.1 Sec.3, shall be applied asfar as relevant and practicable.

202 Propeller nozzles and associated shafts and machinerysituated more that 5 m below lowest transit waterline (TWL)are not considered affected by ice loads.

P 300 Documentation requirements

301 Document requirements listed in the Rules for Classifi-cation of Ships, Pt.5 Ch.1, shall be submitted for review.

Q. Management of Safety and Environmental Protection

Q 100 General

101 Units which have implemented a management system incompliance with the provisions of Q may receive a “ShipboardSEP Classification” certificate. To receive the “Shipboard SEPClassification” certificate, the Company must hold a valid“Company SEP Classification” certificate and the unit musthave been successfully audited by DNV. Units classified in ac-cordance with the provisions of Q will be given the class nota-tion SBM.

102 SEP classification includes:

— assessment of the management system — initial audit of the SEP management system ashore and on-

board— periodical audits ashore and onboard for retention of the

SEP certificates— renewal audits ashore and onboard every fifth year.

Q 200 Technical requirements

201 Assignment of SBM class notation is based on compli-ance with the Rules for Classification of Ships, Pt.7 Ch.5.

R. Special Feature Notations

R 100 General

101 Special feature notations provide information regardingspecial design assumptions, arrangements or equipment whichare not covered by other class notations. Requirements relatedto special feature notations currently in use are described inthis sub-section.

R 200 Special feature notation SUB

201 SUB is applicable for column-stabilised units strength-ened for operation when resting on the seabed.

202 Requirements for air gap, safety against overturning sta-bility, local reinforcement of bottom of pontoons, etc. will beespecially considered for the “resting on seabed” condition.

R 300 Special feature notation NON-SELFPRO-PELLED

301 Units not fitted with propulsion and steering arrange-ment for independent transit will be assigned special featurenotation NON-SELFPROPELLED.

302 For NON-SELFPROPELLED units the survey scopesfor steering gear, tailshaft and thrusters for propulsion may beadjusted in accordance with the intended use (e.g. for DYNPOS-AUTS, POSMOOR, as auxiliary installation, ornot used at all).

S. Summary of Reference Documents for Addi-tional Class Notations

S 100 General

101 Rules and standards which shall be applied for assign-ment of system and special facility class notations are summa-rised in Table S1.

Table P1 ICE class notationsNotation DescriptionICE-T Strengthened for ice condition transit ICE-L Strengthened for ice condition operation

Table S1 Summary of reference documents for system and special facility notationsNotation DescriptionDYNPOS-AUTSDYNPOS-AUTDYNPOS-AUTRDYNPOS-AUTRO

Rules for Classification of Ships Pt.6 Ch.7

CRANE Rules for Classification of Ships Pt.6 Ch.1 Sec.3

DEICEDEICE-C

Rules for Classification of Ships Pt.6 Ch.1 Sec.5

DRILL DNV-OS-E101DSV-I SFDSV-II SFDSV-III SF


E0 ECO Rules for Classification of Ships Pt.6 Ch.3

F-AF-MF-AM

Rules for Classification of Ships Pt.6 Ch.4

FIRE FIGHTER IFIRE FIGHTER IIFIRE FIGHTER III


HELDKHELDK SHELDK SH

DNV-OS-E401

HMON-1HMON-2


ICS Rules for Classification of Ships Pt.6 Ch.5ICE-TICE-L


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POSMOOR POSMOOR-V POSMOOR-TA POSMOOR-ATA

DNV-OS-E301

SBM Rules for Classification of Ships Pt.7 Ch.5TEMPSTORE DNV-OS-A101, DNV-OS-D101, DNV-

OS-D301WELLTEST DNV-OS-E101

Table S1 Summary of reference documents for system and special facility notations (Continued)Notation Description

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CHAPTER 3

CLASSIFICATION IN OPERATION

CONTENTS PAGE

Sec. 1 General Provisions for Periodical Surveys............................................................................... 49Sec. 2 Periodical Survey Extent for Main Class ................................................................................. 55Sec. 3 Periodical Survey Extent for Additional Service Notations..................................................... 61Sec. 4 Periodical Survey Extent for Additional System and Special Facility Notations .................... 63App. A Introduction to Offshore Classification.................................................................................... 69

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SECTION 1GENERAL PROVISIONS FOR PERIODICAL SURVEYS

A. Introducton

A 100 General

101 This section states the periodical survey principles andrequirements for retention of class to units covered by the pro-visions of DNV-OSS-101. Requirements are applicable formain class, service notations and additional class notations un-less otherwise stated.

102 The extent of periodical surveying is presented in Sec.2for main class, Sec.3 for additional service notations andSec.4 for additional system and facility notations.

103 Units of ship-shaped structure are generally treated asships with respect to survey of hull and equipment. Exceptionsare noted in respective survey requirements in Sec.2.

104 If, during a survey, compliance with DNV rule require-ments is sought through safety equivalence considerations,such considerations shall be properly documented by ownerand approved by a qualified surveyor. A memo for surveyorsshall be issued highlighting the arrangement including new ac-ceptance criteria.

105 For column-stabilised and self-elevating units, DNVwill develop and maintain an in-service inspection program(IIP) which will contain the structural items to be surveyed tosatisfy the requirements of main class, excluding any addition-al class notations. The IIP constitutes the formal basis for sur-veying structural items under main class and shall becompleted to the satisfaction of attending surveyor before re-newal survey can be credited.

B. Principles

B 100 General

101 In order to maintain class status, all classed units and in-stallations are required to undergo periodical surveys. The ob-jective of the surveys is to ascertain that the condition of thestructure, machinery installations, equipment and appliancesmeet, and will continue to meet, applicable class requirements.

102 Periodical surveys will in general belong to one of thefollowing categories:

— annual surveys— intermediate surveys— renewal surveys— other complete periodical surveys.

Guidance note:Surveys related to additional class notations shall generally becarried out concurrently with the main class surveys as applica-ble.


103 The surveys shall, as a minimum, be carried out in ac-cordance with the relevant rules and standards. The surveysaim to verify that hull, machinery, equipment and appliances:

— comply with applicable requirements— will remain in satisfactory condition.

104 In cases where the suitability and condition of suchitems cannot be satisfactorily confirmed from a standard sur-vey, more comprehensive examination and/or testing may berequired. This will be at the discretion of the surveyor.

B 200 Due date and survey windows201 The due date of a periodical survey will depend on thesurvey interval, measured from one of the following events,(whichever is relevant):

— date of class assignment— date of commissioning— due date of the previous corresponding survey— date of completion of the previous corresponding survey.

202 A survey “window” exists around each due date, con-sisting of a window before (WB) and window after (WA). Thetotal survey window represents the overall allowable periodwithin which a survey shall be initiated and completed.

203 Surveying should normally be undertaken during thesurvey window. Under certain conditions, however, DNV mayallow surveys to be initiated prior to entering the survey win-dow (see C).

204 Failing to complete surveys before the end of the surveywindow or expiry of allowed postponement will result in warn-ing and potential suspension of class.

B 300 Postponement of periodical surveys301 DNV may accept to postpone periodical surveys beyondthe survey window upon consideration in each separate case.Where postponement is granted, a condition of class (CC) willbe issued stating the time limit for the postponement period.Annual and intermediate surveys shall normally not be post-poned.

302 Upon the owner's request, an extension of the validity ofthe classification certificate by maximum 3 months may begranted in exceptional cases.

C. Periodical Surveys and Intervals

C 100 Survey intervals101 Surveys and survey intervals related to class notationsare presented in the following and summarised in Table C1 andTable C2.

102 Units with additional class notations for which specificsurvey requirements are not stated shall have the equipmentand/or constructions related to this additional class examinedto the attending surveyor's satisfaction at every renewal surveyfor main character of class.

C 200 Annual surveys201 Annual surveys are normally visual examinations to as-certain the general condition of the unit or relevant item.

A more thorough annual survey may be specified for particularstructures, machinery installations or equipment due to conse-quences of failure or age.

202 Unless otherwise stated, annual surveys shall be carriedout within a time period 3 months either side of the due date.

203 Where surveys are completed prior to the specified peri-od, i.e. more than 3 months before due date, the anniversarydate on the classification certificate shall be advanced corre-spondingly, i.e. to a date not more than 3 months later than thesurvey completion date.

Subsequent surveys shall be carried out at prescribed intervalsusing the new anniversary date.

Expiry date of the classification certificate may remain un-

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changed, provided that the prescribed survey intervals are notexceeded. This may require one or more additional surveys.

204 The annual survey shall be carried out concurrently withany renewal survey which is also due.

205 The satisfactory completion of annual surveys for maincharacter of class will be endorsed on the classification certif-icate.

C 300 Intermediate surveys301 Intermediate surveys include visual examinations of hullstructures, machinery, and electrical installations and equip-ment in order to ascertain that the unit continues to complywith class requirements. Intermediate survey testing is speci-fied for particular items as necessary due to consequence offailure or age.

302 Unless otherwise stated, intermediate surveys shall beperformed at the second or third annual survey after the cred-ited date of the renewal survey. Those aspects of the interme-diate survey which are additional to the requirements of theannual survey may be undertaken either at or between the sec-ond or third annual survey.

303 Satisfactory completion of intermediate surveys of maincharacter of class will be endorsed on the classification certif-icate.

C 400 Renewal surveys401 Renewal surveys are major surveys of hull structures,

machinery installations and equipment. Renewal surveys in-clude visual examinations, measurements and tests in order toconfirm that the unit or installation complies with the relevantDNV class requirements and is in satisfactorily maintainedcondition to continue the intended service.

402 Renewal surveys for hull, machinery installations andequipment shall be carried out at 5-yearly intervals for unitsand installations with main class 1A1.

403 DNV may accept that renewal surveys for hull, machin-ery installations and equipment are commenced before duedate, provided that the surveys are completed:

— not later than 12 months after the commencement— in any case not later than expiry date of the classification

certificate including possible postponement granted.

Renewal surveys as stipulated above shall normally not becommenced before the fourth anniversary date.

404 Possible repairs are normally to be carried out before therenewal surveys as given in 401 are regarded as completed andnot later than the expiry date of the classification certificate in-cluding possible postponement granted as given in B300. DNVmay accept that minor deficiencies are rectified within a spec-ified time limit not exceeding 5 months after expiry date of theclassification certificate including possible postponement asgiven in B300.

Table C1 Periodical surveys main class. (For survey extent, see Sec.2)

Main character of

class

Survey extent and type (as applicable)

Survey in-terval, years

Survey time window, see Fig.1

RemarksWB

(months)WA

(months)

1A1

Hull, machinery and equipment

Renewal 5 3 0 (See B300)

Annual 1 3 3

Intermediate 2-3 (see C300)

See C300 See C300

BottomSee Sec.2 D200. For ship shaped structures, see Rules for Classification of Ships, Pt.7 Ch.2 Sec.2J

Tailshaft with continuous corrosion re-sistant metallic liner or shaft of corrosion resistant material or shaft with specially approved protection arrangement

5 6 6

Tailshaft with approved oil sealing glands 5 6 6

May be extended to 10 years provided that an intermediate survey is carried out after 5 years with satisfactory result. May be extended to 15 years provided a tailshaft condition monitoring survey ar-rangement (TMON) has been granted.

Tailshaft of non-corrosion resistant mate-rial without continuous liner or approved oil box

2.5 6 6

Thruster for propulsion See Sec.2Auxiliary boiler 2.5 6 6Steam and steam genera-tor

2.5 6 6

Thermal oil heaters 2.5 6 6

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Figure 1 Survey time windows

405 Any required repairs identified from survey examina-tions and tests (404) shall normally be carried out:

— before the renewal survey is regarded as complete— not later than the expiry date of the classification certifi-

cate including possible postponement granted.

In certain cases, DNV may accept that minor deficiencies arerectified within a specified time limit not exceeding 6 monthsafter expiry date of the classification certificate including pos-

sible postponement as stipulated in B300.

C 500 Other complete periodical surveys

501 Examples of complete periodical surveys are:

— surveys at 2.5 years intervals for additional class notations— surveys at 2.5 years intervals for boilers.

502 Surveys completed prior to the specified period, i.e.more than 3 months before due date, may be accepted. In such

Table C2 Periodical surveys, additional class. (For survey extent, see Sec.3 and Sec.4)

Additional class notation Survey extent and type Survey in-

terval years

Survey time windowsee Fig.1

RemarksWB

(months)WA

(months)

Drilling Unit Drilling unit Annual Complete periodical

15

33

3 See B300

Well Intervention Unit

Well intervention unit

AnnualComplete periodical

15

33

3 See B300

Accommodation Unit

Accommodation unit


15

33

3 See B300

Crane Unit Crane unit AnnualComplete periodical

15

33

3 See B300

Support Unit See relevant class notations See surveys

POSMOOR (-V, -TA, -ATA) Position mooring

AnnualIntermediateComplete periodical

12.55

363

3 6

See B300

See 300

DYNPOS-AUTS, DYNPOS-AUT, DYNPOS-AUTR, DYNPOS-AUTRO

Dynamic positioning, Complete periodical 2.5 6 6

See 300

DRILL Drilling plant AnnualComplete periodical

15

33

3 See B300

HELDK (-S, -SH) Helicopter deck, Complete periodical 5 3 See B300

WELLTEST Well test facility AnnualComplete periodical

15

33

3 See B300

TEMPSTORE Temporary storage of oil


15

33

3See B300

CRANE Crane Annual Complete periodical

15

33

3See B300

DSV (SF-I, SF-II, SF-III) Diving system

AnnualIntermediateComplete periodical

12.55

363

3 6

See B300

See 300

DEICE (-C) De-icing or anti-icing system, Annual 1 3 3

E0, ECOPeriodically unat-tended machinery space

AnnualComplete periodical 1

533

3 3

F-A, F-M, F-AMC Additional fire protection, Complete periodi-cal 2.5 6 6 See 300

FIRE FIGHTER (-I, -II, -III) Fire fighter, Complete periodical 2.5 6 6 See 300

ICS Integrated computer system, Complete peri-odical 2.5 6 6 See 300

HMON-1, HMON-2 Hull monitoring system, Annual 1 2 See B300

SBMSafety and environmental protection (SEP)management system, Complete periodi-cal

5 3 See B300

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cases the anniversary date on the classification certificate shallbe advanced to correspond to a date not more than 3 monthslater than the survey completion date.

Subsequent surveys shall be carried out at prescribed intervalsusing the new anniversary date.

Expiry date of the classification certificate may remain un-changed, in which case one or more surveys may be requiredso that the prescribed survey intervals are not exceeded.

D. Alternative Survey Arrangements

D 100 Continuous surveys

101 DNV may, upon request from the owner, accept contin-uous surveys of hull and machinery (or part thereof) as an al-ternative to relevant renewal survey work. Any acceptance ison condition that the items are surveyed at intervals not ex-ceeding 5 years.

The survey of each item may be carried out 6 months beforedue date, but will have next due date stipulated from ordinarydue date.

Guidance note:Conditions for accepting continuous hull survey are:

— the owner should develop and implement a structural surveyprogram that fulfils classification requirements both with re-spect to visual inspection and non-destructive testing

— the program should be reviewed and accepted by DNV— the requirements for survey on location should be complied

with, see Sec.2 D300— DNV will perform periodical surveys within the survey win-

dows stated— DNV surveys will be a combination of program implemen-

tation review and own surveys.


D 200 Surveys by the chief engineer or maintenance supervisor

201 DNV may, upon request from the owner, accept thatcontinuous machinery surveys, subject to the provisions of202 to 205, are carried out by the person in charge of the ma-chinery department (chief engineer or maintenance supervi-sor).

It should be noted, however, that all surveys taking place atports where DNV is represented shall be carried out by DNV.

202 The conditions for granting this type of chief engineer ormaintenance supervisor survey arrangement will normally be:

— the owner (or managing owner) must confirm the requiredqualifications of the chief engineer or maintenance super-visor

— he or she has sailed a minimum of 3 years as chief engineeror maintenance supervisor with the relevant national cer-tificate

— he or she is presently sailing as a chief engineer or mainte-nance supervisor with the relevant national certificate andhas been employed with the owners (or managing owners)for at least 3 years

— for MOUs where it is not required to have a chief engineer,other person in charge of the maintenance (maintenancesupervisor) may be accepted on a case by case basis.

The approval is unit specific.Guidance note:Chief engineers or maintenance supervisors previously approvedby DNV need not fulfil the third requirement.


203 When a chief engineer has been accepted for surveys onbehalf of DNV, DNV will issue a chief engineer or mainte-nance supervisor authorisation letter. This authorisation lettershall be kept available for presentation to DNV surveyors onrequest.

204 Half of all items covered by a continuous machinery sur-vey scheme (of which there are more than one) may be sur-veyed by the chief engineer or maintenance supervisor (i.e. hemay survey half of all identical items in one five-year surveycycle).

205 Auxiliary diesel engines and turbines may wholly besurveyed by the chief engineer or maintenance supervisor, pro-vided that a test run including testing of safety functions is per-formed in the presence of a DNV surveyor. In addition, everyalternate survey of auxiliary diesel engines and turbines shallbe carried out by a DNV surveyor.

206 All surveys carried out under supervision of the chief en-gineer or maintenance supervisor shall be recorded in the en-gine log book and relevant extracts given the first attendingDNV surveyor. The surveyor may, if he finds it necessary, re-quire re-survey of the parts in question.

207 Generator parallel operation, generator load test, andtesting of protection devices for generators and switchboardsshall be witnessed by a DNV surveyor (see Sec.3).

D 300 Survey arrangement based on approved planned maintenance system (PMS)

301 A survey arrangement based on a planned maintenancesystem (PMS) is an alternative to the continuous machinerysurvey (CMS). Such survey arrangement shall be operated un-der the following conditions:

1) The planned maintenance system shall be computer based.

Guidance note:If the system is centrally operated with the computer ashore, thiscan be accepted provided that implementation survey and annualsurvey are carried out both at the location from where the systemis operated, and on board.


2) The unit shall be manned by chief engineers or mainte-nance supervisors who are familiar with the system. Achief engineer or maintenance supervisor approved byDNV shall be on board at least 50% of the time.

3) The planned maintenance system shall be approved.

4) The manager or operator shall have established a plannedmaintenance system that includes at least all items andsystems that are covered by the continuous machinery sur-vey (CMS) scheme.

5) Maintenance job descriptions and intervals shall be basedon manufacturer’s recommendations. Experience mayshow that intervals need to be adjusted, in these cases doc-umentation is required if intervals shall be extended.

6) All components in the CMS scheme shall be clearly iden-tified with the CMS code in the system.

7) The system shall be able to produce a maintenance historyreport of all main overhauls carried out for a specific timeperiod.

8) The maintenance may be based on calendar or runninghours, or based on monitoring of condition and perform-ance.

9) The job descriptions for the main overhaul for all the com-ponents in the unit’s CMS scheme shall cover the require-ments for class survey, and will be credited as a classsurvey each time these jobs are carried out. If some mainoverhaul intervals are based on running hours and these in-tervals normally will exceed 5 years, the items will still be

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credited after 5 years based on satisfactory documentationof regular maintenance records and tests.

10) A system for control of components that are being re-usedin different positions (circulating components, e.g. piston,cylinder cover) shall be established for all such compo-nents in the CMS scheme.Guidance note:It is not required that this system shall necessarily be an integrat-ed part of the planned maintenance system.


11) The CMS items for sea valves and sanitary valves cannotbe credited by the chief engineer, but shall always be sur-veyed by a surveyor. The CMS items for parallel opera-tion, testing of the generators and testing of setting formain and emergency generator's protection devices andcircuit breaker shall always be carried out in the presenceof a surveyor. These requirements shall be stated in the in-structions in the planned maintenance system.

12) All corrective actions shall be especially identified in thesystem.

13) The job descriptions and maintenance history shall be inEnglish.

14) Backup routines shall be established.

15) Annual survey shall be carried out in order to prolong thevalidity of the survey arrangement.

16) Damage to machinery or equipment covered by classifica-tion shall always be reported to the Society and into theplanned maintenance system as a corrective action. Thecorresponding repair shall always be verified by a survey-or.

17) In case of change of manager or operator leading to signif-icant changes in the maintenance system, the survey ar-rangement shall be re-approved.

The survey arrangement may also include the instrumentationand automation equipment covered by the rules for the classnotations E0 or ECO. All jobs related to the notations E0 orECO have then to be included in the system, clearly identified,with proper test routines and maintenance descriptions.

The owner may include drilling and production equipment re-lated to the relevant service notation.

If these conditions are not complied with and the deficiency isnot rectified within a given time, the survey arrangement willbe cancelled. The conditions for ordinary continuous surveyarrangement (CMS) of machinery will be re-introduced and allCMS items will be given a due date 5 years from the last sur-vey date.

302 Before a unit may be accepted for alternative survey un-der a PMS arrangement, the system shall be based on an ap-proved PMS program. This program may be type approved orapproved on a case-by-case basis.

Guidance note:The supplier of the planned maintenance system can obtain typeapproval while the system approval can be obtained by the man-ager or operator.


303 The system approval of the planned maintenance systemis based on a description of the system and the following doc-umentation:

1) List of items or systems that are included in the PMS withthe corresponding CMS codes.

2) Examples of maintenance descriptions with correspondingtime intervals and identification of class related compo-nents (CMS code).

3) Job descriptions for the CMS items for sea valves and san-itary valves and for parallel operation, testing of the gen-erators and testing of setting for main and emergencygenerator's protection devices and circuit breaker.

4) Example of maintenance history report (class report) forcrediting of CMS components. The report shall at leastcontain component name, CMS code, interval, carried outdate (running hours if applicable) and job history.

5) Procedures for reporting of maintenance activity (accesscontrol in the system, which are reporting history into thesystem etc.).

6) Description of the functionality for handling of postponedor overdue jobs.

7) Description of the system for control of components thatare being re-used in different positions (circulating com-ponents, e.g. piston, cylinder cover).

8) A description of the manager's or operator's maintenancestrategy including a chart of responsibility for the unit andthe management.

9) Description of routines for continuous improvement of themaintenance strategy and intervals on critical components.Identification and follow-up of unplanned maintenance,recording of condition before maintenance is carried out,and recording of all changes in system are important ele-ments in this context.

Guidance note:Maintenance strategy is the manager's or operator's descriptionof how the different machinery items are maintained, that couldbe time based maintenance, condition monitoring and correctivemaintenance.


When the owner is granted a system approval of their system,a system approval certificate will be issued to the owner statingthe system type. A copy of this certificate shall be on boardevery unit that intends to apply for the PMS arrangement.

304 A system approval or a type approval is an approval ofthe system itself and it’s functionality, and not an approval ofhow it is implemented on board each unit. The owner may usethe approved system on board all the units in his fleet, but animplementation survey shall be carried out on each unit beforethe PMS survey arrangement is granted. For type approvedsystems, the documentation in items 1, 2, 7 and 8 in 303 shallbe submitted before the implementation survey is carried out.

305 An implementation survey on board the unit is requiredin order to verify that all the conditions listed in 301 are com-plied with. Provided that the implementation survey is carriedout with a satisfactory result, a certificate for the survey ar-rangement will be issued for the unit stating system type andconditions for the survey arrangement.

D 400 Survey arrangement based on condition monitor-ing system

401 Machinery equipped with instrumentation enabling thecondition of the machinery components to be ascertained andmonitored may be subject to special approval regarding the ex-tent and method of the survey.

402 DNV may give approval for 15 year intervals betweencomplete periodical surveys for oil lubricated tail shafts thatare monitored, to ascertain the condition of the tailshaft sys-tem, during operation. A tailshaft condition monitoring surveyarrangement (TMON) will be granted in such cases. Disman-tling of keyed propellers will be required at intervals not ex-ceeding 5 years. The following parts are to be surveyed:

— cone, key and keyway, including examination by an ap-proved crack detection method of the fore part of the taper.

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D 500 Surveys of units and installations out of commis-sion501 Units shall continue to be subject to annual surveys dur-ing lay-up.

502 If the lay-up period is more than 12 months, other peri-odical surveys (excluding the annual survey), may be post-poned depending on the maintenance and preservativemeasures taken during lay-up.

503 Units which have been out of commission (i.e. laid up)for a period normally of 12 months or more shall be surveyedand tested before re-entry into service. This will at least in-clude a sea trial for function testing of the machinery installa-tion. Remaining surveys and tests will be considered in eachcase depending upon the time out of commission, maintenanceand preservative measures taken during lay-up, and extent ofsurveys carried out during this time.

E. Special Provisions for Hull Surveys

E 100 General101 The owner shall provide the necessary facilities for asafe execution of the survey.

102 Tanks and spaces shall be safe for access, i.e. gas freed,ventilated, etc.

103 Tanks and spaces shall be sufficiently illuminated, cleanand free from water, scale, dirt, oil residues, etc. to reveal sig-nificant corrosion, deformation, fractures, damage or otherstructural deterioration. Cleanliness is particularly importantfor areas which are subject to thickness measurement.

E 200 Access to structures201 For overall examination, means shall be provided to en-able the surveyor to examine the structure in a safe and practi-cal way.

202 For close-up examination, one or more of the followingmeans for access, acceptable to the surveyor, shall be provid-ed:

— permanent staging and passages through structures— temporary staging and passages through structures— lifts and moveable platforms— boats or rafts— other equivalent means.

E 300 Equipment for survey301 Thickness measurements shall normally be carried outby means of ultrasonic test equipment. The accuracy of theequipment shall be proven to the satisfaction of the surveyor asrequired.

302 One or more of the following non-destructive testingprocedures may be required if considered necessary by the sur-veyor:

— radiographic testing— ultrasonic testing— magnetic particle testing— eddy current testing

— dye penetrant testing— other equivalent means.

F. Procedures for Class Related Services

F 100 Thickness measurements of hull structures101 Thickness measurements shall be carried out by a quali-fied company which is certified for such activities by DNV.

102 Thickness measurements shall normally be performedunder the supervision of the surveyor. Alternatively, the sur-veyor may accept non-DNV supervised thickness measure-ment provided that provisions are made for the surveyor to re-check the measurements as deemed necessary to ensure ac-ceptable accuracy.

103 When thickness measurements are required in connec-tion with intermediate, renewal or complete periodical survey,the thickness measurements shall normally be carried out with-in 12 months prior to the completion of the survey.

104 Thickness measurements required, if not carried out bythe Society itself, shall be witnessed by a surveyor on board tothe extent necessary to control the process.

105 A thickness measurement report shall be prepared. Thereport shall give the location of the measurements, the thick-ness measured and the corresponding original thickness. Fur-thermore, the report shall give the date when the measurementswere carried out, type of measurement equipment, names ofpersonnel and their qualifications. The report shall be signedby the operator. The surveyor shall verify and countersign thereport.

Guidance note:The single measurements recorded should represent the averageof multiple measurements.


G. Repairs of Structural Damage

G 100 Definition101 A prompt and thorough repair is a permanent repaircompleted at the time of survey to the satisfaction of the sur-veyor, therein removing the need for the imposition of any as-sociated condition of class.

G 200 Repairs201 Any damage in association with wastage over the allow-able limits (including buckling, grooving, detachment or frac-ture), or extensive areas of wastage over the allowable limits,which affects or, in the opinion of the surveyor, will affect theunit's structural, watertight or weathertight integrity, shall bepromptly and thoroughly repaired.

202 Additionally, when a survey results in the identificationof significant corrosion or structural defects, either of which,in the opinion of the surveyor, will impair the unit's fitness forcontinued service, remedial measures shall be implementedbefore the unit continues in service.

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SECTION 2PERIODICAL SURVEY EXTENT FOR MAIN CLASS

A. General

A 100 Introduction101 This section presents the standard extent of surveys forretention of main class (1A1).

102 The requirements for service notations are given inSec.3, and additional system and special facility class nota-tions are given in Sec.4.

103 For units and installations with special feature notationNON-SELFPROPELLED the survey scopes for steeringgear, tailshaft and thrusters for propulsion may be adjusted tobe in accordance with the intended use (e.g. for DYNPOS-AUTS, POSMOOR, as auxiliary installation, or not used).

104 DNV’s Total Safety Class does not apply to mobile off-shore units.

B. Annual Survey

B 100 Survey extent101 The survey will normally cover systems and parts for:

— structure and equipment (see B200)— machinery and safety systems (see B300).

B 200 Structure and equipment for ship-shaped units201 Survey requirements for ship-shaped structures and re-lated equipment are given in the Rules for Classification ofShips, Pt.7 Ch.2 Sec.2 unless otherwise stated.

202 The following items shall, however, be surveyed in ac-cordance with mobile offshore unit requirements:

— stability (recording for lightweight)— moorings— tank level measurements— helicopter fuel— external corrosion.

B 300 Structure and equipment for column-stabilised and self-elevating units301 The survey may be performed on location provided thatthe structure, including submerged parts, can be thoroughly in-spected as specified in the in-service inspection programme. Ifrequired, underwater inspection shall be in accordance with anapproved procedure, and using approved personnel and equip-ment.

302 Units with submerged primary structural members al-lowing internal access for inspection may be omitted from ex-ternal survey, subject to satisfactory results from the internalsurvey.

303 Primary structural members which are flooded shall besubject to external survey unless otherwise agreed. The extentof survey is given in the in-service inspection program, andwill comprise visual inspection of vital parts and may includenon-destructive testing of highly stressed areas.

304 The means for leakage detection of dry bracings shall befunction tested.

305 Internal surfaces in ballast tanks may be subject to sur-vey, including thickness measurements. The permissible re-duction in thickness is as given for the renewal survey.

306 Accessible and visible parts of the unit's permanent tow-ing arrangement and temporary and emergency mooring sys-

tem shall be inspected. If the temporary mooring system is partof the mooring system for position keeping on location, thenaccessible and visible parts of the position mooring systemshall also be inspected.

307 Items which are important for the reserve buoyancy inconnection with stability of the unit shall be surveyed. The sur-vey shall include inspection of external and internal closing ap-pliances, ventilators, air pipes, side scuttles etc., as well as anexternal inspection of scupper valves and sanitary valves.

308 Remote controls and alarm systems for doors and hatch-es shall be surveyed and function tested.

309 Guard rails shall be examined.

310 For units subjected to annual load line inspections byDNV, the requirements in 307 and 309 are considered coveredby this inspection.

311 The «Appendix to the classification certificate» and thedocuments referred to therein, shall be verified as kept availa-ble on board the unit.

B 400 Machinery and safety systems for ship-shaped units

401 Survey requirements for machinery and safety systemson ship-shaped units are given in the Rules for Classificationof Ships, Pt.7 Ch.2.

B 500 Machinery and safety systems for column-stabi-lised and self-elevating units

501 The survey shall include examination of spaces for ma-chinery, boilers and incinerators, and equipment located there-in, with particular attention to fire and explosion hazards. Asthe DNV surveyor deems necessary, running tests and/or open-ing of machinery, and tests of safety devices and equipmentmay be required.

502 Boilers shall be externally surveyed. The general condi-tion of the boiler including mountings, piping and insulationshall be ascertained and the surveyor may require opening, re-moval of insulation etc. if found necessary. Safety valves, in-strumentation and automation systems shall be tested inoperating condition when found necessary by the surveyor.

503 The bilge and ballasting system and related subsystems,such as remote valve operation and tank level indications forcolumn-stabilised units shall be visually surveyed and tested.

504 The brake torques of jacking machinery on self-elevat-ing units shall be checked. Where provided, the fixation racksystem shall also be checked.

505 For steering gears and/or propulsion thrusters appliedfor steering purposes, steering functions and alarms shall betested.

506 For units granted a survey arrangement based on an ap-proved planned maintenance system (PMS), an annual surveyof the PMS is required to prolong the validity of the arrange-ment. The purpose of this survey is to review and evaluate theprevious period's maintenance activities and experience. Theannual survey shall consist of the following main elements:

a) The maintenance history will be examined in order to ver-ify that the PMS has been operated according to the inten-tions and that the system is kept up to date.

b) Evaluation of the maintenance history for main overhauljobs on the components covered by the continuous ma-chinery survey (CMS) scheme carried out since last annualsurvey.

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c) Details of corrective actions on components in the CMSscheme shall be made available.

d) If condition monitoring equipment is in use, function testsof this equipment and verification of the calibration will becarried out as far as practicable and reasonable.

If found necessary by the surveyor, opening or testing of ma-chinery may be required.

507 In hazardous areas the following equipment and systemsshall be surveyed or tested:

— ventilation systems shall be function tested. The tests shallinclude emergency stop systems and alarms for lost venti-lation

— alarms and shutdown functions for pressurised equipmentshall be function tested

— gas detection equipment shall be function tested— electrical equipment shall be visually inspected.

C. Intermediate Survey

C 100 General101 The survey shall normally be carried out in sheltered wa-ters. Survey on location may be acceptable provided that theunderwater inspection is performed in accordance with an ap-proved procedure, and using approved personnel and equip-ment.

C 200 Structure and equipment for ship-shaped units201 Survey requirements for ship-shaped structures and re-lated equipment are given in the Rules for Classification ofShips, Pt.7 Ch.2.


— stability (recording for lightweight)— moorings— external corrosion.

C 300 Structures and equipment for column-stabilised and self-elevating units301 The survey shall, in general, be carried out as the annualsurvey, but with extended visual inspection and non-destruc-tive testing of the structure as given in the in-service inspectionprogramme.

302 The cathodic protection system shall be surveyed by vis-ual inspection of sacrificial anodes and extent of corrosion.Corrosion in welds of vital parts which may be subject to fa-tigue shall be particularly considered.

303 For column-stabilised units, the survey shall, at mini-mum, cover accessible areas at light ballast draught.

304 For self-elevating units, survey of the full height of the

legs is normally required. Potential measurements will also berequired if found necessary.

305 If the temporary mooring system is part of the mooringsystem for position keeping on location, then the positionmooring system shall also be inspected. The mooring systemshall be function tested during typical anchor handling opera-tions.

C 400 Machinery and safety systems for ship-shaped units

401 Survey requirements for machinery and safety systemson ship-shaped units are given in the Rules for Classificationof Ships, Pt.7 Ch.2.

402 However, tank level measurement and helicopter fuelitems shall be surveyed in accordance with offshore unit re-quirements.

C 500 Machinery and safety systems for column-stabi-lised and self-elevating units

501 The survey shall generally be carried out as for the an-nual survey.

502 The fire protection arrangement shall be surveyed. Forunits being inspected by national authorities with respect tofire protection arrangement, the survey for classification maynormally be considered as covered by this inspection.

D. Renewal Survey, Structure and Equipment

D 100 Ship-shaped structures

101 Survey requirements for ship-shaped structures and re-lated equipment are given in the Rules for Classification ofShips, Pt.7 Ch 2.


— stability (recording for lightweight)— moorings— external corrosion.

103 Alternative survey arrangements given in 300 may beapplied also for ship-shaped units.

D 200 Column-stabilised and self-elevating structures 201 The renewal survey includes the requirements given inB and C. The extent of the survey is given in the in-service in-spection programme, and will additionally include the require-ments given in 202 to 216.

202 Survey of pipes, valves, couplings, anodes, equipmentfor level indication, etc. inside tanks and spaces.

203 Tanks shall, as a minimum, be internally surveyed in ac-cordance with Table D1, as far as applicable.

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204 Remote level indicating systems for ballast tanks shallbe surveyed and function tested.

205 Remote control system for valves in bilge, ballast andcooling water systems shall be surveyed and tested.

206 Tank bulkheads and tank decks integral with the unitstructure shall, as a minimum, be hydraulically tested from atleast one side to the maximum pressure they can be subjectedto in service. The number of tanks to be tested shall be in ac-cordance with Table D1, as far as applicable.

207 Thickness measurements shall be carried out as deemednecessary by the surveyor. The reduction in thickness is notnormally to exceed 5% of the original thickness. Larger reduc-tions may be allowed upon special consideration.

208 The jacking systems, including shock pads, shall be ex-amined. A selected number of jacking gear units (about 10%,but not less than one unit per leg) shall be opened up for in-spection.

209 For self-elevating units, all parts of the legs shall be ex-amined.

210 The towing and mooring equipment shall be surveyed asfollows:

— all chain lockers and anchor stowage arrangements shallbe surveyed

— the permanent towing arrangement of the unit shall be sur-veyed

— the temporary and/or emergency mooring systems shall besurveyed

— if the temporary and/or emergency mooring systems arepart of the mooring system for position keeping on loca-tion, the complete mooring system for position keepingshall be subject to a comprehensive survey. This will in-clude thorough visual examination and extensive non-de-structive testing of mooring chain or wire rope. Thisinspection shall include dismantling and non-destructivetesting of all joining shackles that have been in service formore than 5 years.

— Function testing of the mooring systems shall be per-formed.

211 Underwater parts including nozzles, propellers and otherappendages shall be surveyed.

The propeller and any auxiliary thrusters shall be surveyed andshaft sealing arrangements checked for tightness. For shaftsnot running in oil, the clearances shall be measured. For varia-ble pitch propellers, the tightness of hub and blade sealingsshall be verified, and the locking arrangements for bolts to bechecked. Some extent of dismantling may be required as foundnecessary by the surveyor.

212 Sea chests and other sea inlets and discharges (aboveand below the waterline) with valves, including sanitary valvesand scupper valves, shall be opened for survey.

213 The unit is to undergo a weight or displacement surveyand the weight record will be checked in order to verify thecurrent lightweight and centre of gravity. Where the weightsurvey indicates a difference from the calculated lightweight inexcess of 1% of the operating displacement, an inclining testshould be conducted. For self-elevating units deviations up to5% of the operating displacement may be accepted upon spe-cial considerations. It is a provision that the weight differenceis positioned at the most unfavourable position when calculat-ing the vertical centre of gravity (VCG).

The above mentioned requirements may be considered com-plied with where the national authorities enforce similar re-quirements. In such cases a copy of the report on the weightsurvey, or on the new inclining test, endorsed by the nationalauthorities, shall be submitted.

214 The presence of required signboards shall be verified.

215 The cathodic protection system of the submerged zoneshall be surveyed. The efficiency of the system for the forth-coming 5-year period shall be confirmed.

216 The unit shall be dry docked at the third renewal surveyand at each renewal survey thereafter, unless acceptable equiv-alent alternatives are agreed.

See also 300.

217 Fixation of major appurtenances to the main structureshall be surveyed. These may typically include crane pedes-tals, helicopter decks, drilling derricks, lifeboat platforms andheavy deck modules or skids.

D 300 Alternative survey

301 Renewal surveys may be carried out on location withoutinterrupting the function of the unit, provided that they arebased on approved procedures outlined in a maintenance sys-tem and survey arrangement.

302 The following matters will be taken into considerationfor acceptance of surveys to be carried out on location:

— arrangement for underwater inspection of structure, pro-pellers

— thrusters, rudder and openings affecting the unit’s safety— means for blanking off all openings including side thrust-

ers— use of corrosion resistant materials for shafts, and glands

for propeller and rudder— accessibility of all tanks and spaces for inspection— corrosion protection of structure— maintenance and inspection of thrusters— measurement of wear in the propulsion shaft and rudder

bearings— testing facilities of all important machinery.

303 Provisions regarding fatigue safety factors and corrosionprotection shall be in accordance with the following require-ments:

— DNV-OS-C102 Appendix A for ship-shaped units— DNV-OS-C103 Appendix A for column-stabilised units— DNV-OS-C104 Appendix A for self-elevating units.

Table D1 Tank survey and pressure testing 1), 2)

Tank Age of unit in years0-5 5-10 10-15 above 15

Sea water 3) all all all allFresh water one one all allFuel and sludge one one two halfLubricating oil none none one half

Notes:

1) Tanks of integral type

Guidance note:Integral tanks form a part of the unit’s hull and are influenced in thesame manner and by the same loads that stress the adjacent hull struc-ture.Independent tanks within machinery spaces (non-integral, self-support-ing tanks which do not form part of the unit's hull) are normally sur-veyed as part of the renewal survey for machinery, see E.


2) If a selection of tanks are accepted to be surveyed, then different tanks shall, as far as practicable, be surveyed at each survey, on a rotational basis.

3) Tanks used as bilge water holding tanks, shall be examined as required for sea water tanks.

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E. Renewal Survey, Machinery and Safety Systems

E 100 General101 The survey shall include the items given in Table E1 asfar as applicable.

102 Automated machinery plant shall be surveyed to the ex-tent required for E0 or ECO survey, as far as applicable.

103 By completion of the 5-year CMS cycle, all items shallhave been credited. Items maintained according to runninghours or condition monitoring criteria, without a ‘main over-haul’ carried out in the cycle, may be credited based on satis-factory maintenance or condition monitoring records, clearlyindicating that the maintenance is not calendar based.

E 200 Electrical installations201 Ship-shaped units

Survey requirements for electrical systems on ship-shapedunits are given in the Rules for Classification of Ships, Pt.7Ch.2.

202 Column-stabilised and self-elevating units

The survey shall comprise examination of the electrical instal-lations with regard to fire and explosion hazards and injuryfrom accidental touching. The survey is also to include testingof correct functioning of equipment covered by class require-ments.

203 The insulation resistance of the complete installationshall be measured, and the results presented to the DNV sur-veyor.

204 As far as practicable, the following equipment shall beexamined for satisfactory condition:

— main and emergency switchboards— generators— distribution boards— motor starters— electrical motors— converters (e.g. transformers, rectifiers, chargers)— cable installations— enclosures for electrical equipment— lighting equipment— heating equipment— battery installations.

205 The following tests shall be carried out to the extentdeemed necessary by the surveyor to ascertain the proper func-tioning of the equipment:

— generator full load test— generator parallel operation— generator protection relays including non-important load

trip, if fitted— generator remote speed control— generator synchronising equipment— power plant interlocking systems— insulation resistance indicating device— emergency generator including switchboards— battery chargers— mechanical ventilation of battery rooms and lockers— navigation lights, with controllers including alarms— electrical motors for essential and important use, e.g. for

jacking system at full load— interlocking and/or alarms for pressurised rooms and

equipment.

E 300 Instrumentation and automation

301 Correct functioning of the various parts of the followingsystems shall, as far as applicable, be verified to the satisfac-tion of the attending surveyor:

— each alarm and safety system— fire alarm system— manual control of machinery— remote control of propulsion machinery. It will normally

be required that the following manoeuvres are effected:

— from stop to head— from ahead to astern— stop— from stop to astern— stop by operating the emergency device.

302 It shall be verified that the remote control can be trans-ferred to stand-by manual control in the engine room in case ofpower supply failure to the remote control system.

303 When cancelling of automatic load reduction and/or au-tomatic stop of engine are provided, these functions shall bedemonstrated to the satisfaction of the surveyor.

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F. Renewal Survey, Tailshaft Survey

F 100 Standard requirements101 For renewal survey, the tailshaft shall be withdrawn andthe following parts examined, where relevant:

— propeller nut and threaded end of tailshaft

— cone, key and keyway, including examination of the partof the taper and keyway by magnetic particle inspectionmethod

— tailshaft bearing areas— stern tube bushes or bearings. Clearance measurements

shall be included— shaft sealing arrangement, including lubricating oil sys-

tem.

Table E1 Machinery surveysItem or system Survey method 1)

Propulsion machinery

Diesel enginesEvaporators and condensers with ejectorsElectrical main motorsThrust- and intermediate shaft bearings

1 and 21

1 and 21

Gears 3) Shafts with pinions, gear wheels, couplings and bearings 1

Auxiliary machineryDiesel engineTurbines Prime movers for auxiliary thrusters 2) 3)

1 and 21 and 2

2

Pumps 4)

Piston pumpsScrew pumps, gear pumpsCentrifugal pumps for sea water, bilge and ballastOther centrifugal pumps and ejectors

1212

Pipes, valves, independent tanks, etc. 10) 11) 13)

Lubricating oil 5)

Fuel oil 12)

Bilge and ballast 6) Cooling waterHigh pressure mud system 7)

Steam with temperature below 450ºCSteam pipes of copper 8)

Feed waterCompressed airHydraulic oil

2222222222

Electrical installations

GeneratorsSwitchboardsDistribution boardsElectrical equipmentCable installationNavigation light controllersMechanical ventilation of battery lockers and rooms

2222222

Sundry 4)

Gas compressorsAir compressorsEmergency compressorsCompressed air receivers 9)

Heat exchangersIncinerator arrangementInert arrangement for units without notation INERT (see also Rules for Classi-fication of ships Pt.7 Ch.2 Sec.3 H)Instrumentation and automation for units without notation E0 or ECO.

1 and 222

1 and 212

1 and 2

21) The survey methods given are defined as follows:

Survey method No. 1: Visual inspection by opening up fully or partly as deemed necessary by the surveyor. Pressure testing to be carried out when rel-evant and found necessary by the surveyor.Survey method No. 2: External survey and performance test to be carried out. Alarm- and safety functions shall be tested if found necessary by the sur-veyor. Opening up and/or pressure testing may be required if found necessary by the surveyor. Last overhaul shall be verified.

2) For definition and survey extent, see G.

3) Selected bearings shall be examined. Gears and roller bearings may as far as practicable be inspected without dismantling complicated assemblies.

4) Prime movers and starters shall be surveyed together with pumps and units.

5) Strainers shall be opened. Selected pipes and engine system tanks, if any, shall be surveyed for sludge.

6) Valves, cocks and strainers shall be opened.

7) Crack and/or thickness examination may be required. Selected pipes shall be pressure tested to 1.5 times working pressure.

8) Shall be pressure tested to 2 times working pressure.

9) Shall be pressure tested to 1.2 times working pressure if internal survey is not possible.

10) Sea valves shall be opened (including scuppers and sanitary discharges).

11) For piping systems outside machinery spaces, see Sec.4.12) Settling tanks and daily service tanks for both heavy fuel and diesel oil to be surveyed for sludge. If inspection and cleaning of above tanks have been

carried out by the crew during the last 12 months and relevant log extracts provided and confirmed, this may be accepted as survey at the surveyor's discretion.

13) Valves where function in the piping system is not evident are to be checked for adequate and readable marking for identification.

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F 200 Alternative survey201 The following alternative requirements do not apply totailshafts covered by additional class notations DYNPOS-AUTS, DYNPOS-AUT, DYNPOS-AUTR and DYNPOS-AUTRO.

202 Subject to 201, an alternative tailshaft survey may be ac-cepted for oil lubricated tailshafts with approved sealing ar-rangement, provided that the number of service hoursencountered is relatively low, e.g. less than 5000 hours sincethe last tailshaft survey.

203 At the first renewal survey, the lubricating oil for each ofthe stern tubes shall be analysed and the results forwarded toDNV. Acceptable analysis results, together with satisfactorysurvey of accessible parts of the shafts including clearancemeasurements, will normally be considered sufficient.

204 In addition to 202 and 203, the second and third renewalsurveys shall also include removal of key fitted propellers andsurvey of the tailshaft cone including key and keyway.

205 At the second renewal survey, 50% of all similartailshafts shall be surveyed, with the remaining 50% of thetailshafts to be surveyed at the third renewal survey. Magneticparticle inspection shall be used.

206 From the fourth renewal survey and onwards, a com-plete tailshaft survey shall be carried out.

F 300 Tailshaft condition monitoring survey arrange-ment301 See Sec.1 D402.

G. Renewal Survey, Thrusters for Propulsion

G 100 Scope101 Thrusters for propulsion are defined as any thrusterswhich are assigned for propulsion and/or steering of the unitduring sea voyage.

102 Thrusters installed to achieve redundant main propul-sion systems shall be regarded as thrusters for propulsion.

103 Thrusters for dynamic positioning are thrusters incorpo-rated in systems for dynamic positioning of units which havebeen granted one of the additional class notations DYNPOS-AUTS, DYNPOS-AUT, DYNPOS-AUTR and DYNPOS-AUTRO.

104 Thrusters for other purposes than specified in 101 to 103are defined as auxiliary thrusters, see D211.

G 200 Renewal survey201 The survey of thrusters for propulsion will normally in-clude:

— examination of gears, shafts, bearings and gland seals— examination of propeller shaft cone and keyway using an

approved crack detection method— survey of the lubricating oil system including pumps and

coolers— verification of tightness of all sealing arrangements.

G 300 Alternative survey301 The following alternative requirements do not apply tothrusters covered by one of the additional class notationsDYNPOS-AUTS, DYNPOS-AUT, DYNPOS-AUTR andDYNPOS-AUTRO.

302 Subject to 301, an alternative thruster survey may be ac-cepted for oil lubricated propeller shafts with approved sealingarrangement, provided that the number of service hours en-countered is relatively low, e.g. less than 5000 hours since thelast propeller shaft survey.

303 At the first renewal survey, magnetic filters shall bechecked. The lubricating oil for each of the thrusters shall beanalysed and the results forwarded to DNV. Acceptable anal-ysis results, alongside satisfactory survey of accessible parts ofthe shafts, will normally be considered sufficient.

304 In addition to 302 and 303, the second and third renewalsurveys will also include removal of key fitted propellers andsurvey of the propeller shaft cones including key and keyway.

305 At the second renewal survey 50% of all similar propel-ler shafts shall be surveyed, with the remaining 50% of propel-ler shafts to be surveyed at the third complete periodicalsurvey. Magnetic particle inspection shall be used.

306 From the fourth complete periodical survey and on-wards, a complete propeller shafts survey shall be carried out.

H. Renewal Surveys, Boiler and Steam Heated Steam Generator

H 100 Renewal survey

101 The survey shall normally include:

— internal and external examination of the boilers, super-heaters, economisers and air preheaters or steam heatedsteam generator, including drums, stays, pipes, insulation,etc.

— internal examination of all mountings— setting of safety valves including remote operation of

same, except that for exhaust gas boilers where the safetyvalves may be set by the chief engineer or maintenance su-pervisor and the results reported to DNV

— examination and testing of instrumentation and automa-tion equipment

— examination and testing of attached fuel oil burning equip-ment.

102 If found necessary, the surveyor may require hydraulictest, thickness measurements and/or crack detection test of anypart of the installation.

I. Thermal Oil Heater Survey

I 100 Renewal survey


— tightness test of the installation with special attention toflange connections and valve and pump packings

— external examination of coils in the oil fired furnace— testing of thermal oil-flow and pressure drop across the

heater including comparison with reference data from theheater as new. Significant increase in flow resistanceacross the furnace coils will require internal cleaning ofthe coils

— examination and testing of plant instrumentation includingregulation and safety systems

— examination and setting of liquid relief valves— examination of fuel oil equipment including burners with

nozzles— examination of fire extinguishing system with release ar-

rangements for the thermal oil installation including fur-nace

— analysis of thermal oil samples from the system in order toestablish safe operating temperature and state of deteriora-tion

— function test of plant with special attention to stability ofautomatic regulating systems.

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SECTION 3PERIODICAL SURVEY EXTENT FOR ADDITIONAL SERVICE NOTATIONS

A. General

A 100 Introduction101 This section presents the standard extent of surveys forretention of additional service notations applicable to offshoredrilling and support units. The requirements shall be applied inaddition to those for main class notation presented in Sec.2.

B. Drilling Units

B 100 Application101 The requirements in B apply for units with class nota-tion:

Drilling Unit.

B 200 Annual survey201 The requirements given shall be regarded as supplemen-tary to those given for the main class.

202 The drill floor and substructure shall be surveyed withemphasis on structural integrity and supporting structure forequipment applied in drilling operations.

203 Where cross connections between piping system fordrilling or well testing operation and safe piping system exist,the means for avoiding possible contamination of the safe sys-tem with the hazardous medium shall be surveyed.

204 In hazardous area the following equipment and systemsshall be surveyed and tested:

— ventilation including overpressure or flow and alarms— self-closing gastight doors and airlocks including other

openings or accesses— alarms or shutdown of pressurised equipment— electrical equipment and cables— devices for monitoring of insulation resistance or earth

leak monitoring including alarms— protection devices for combustion engines— emergency shutdown facilities.

205 The following systems shall be surveyed and tested forcorrect functioning if found necessary by the surveyor:

— fire detection system— gas detection system, both flammable and toxic— alarms for abnormal drilling condition— general alarm system and communication between control

stations.

206 The apparatus for breathing protection and gas measur-ing devices shall be surveyed.

207 Owners are required to operate a system for planned in-spection and maintenance of highly pressurised equipment re-lated to the drilling plant. The surveyor shall verify thesatisfactory implementation of this system.

B 300 Complete periodical survey301 The requirements given in 200 apply with the additionalamendments given in 302 to 305.

302 Function test of instrumentation and safety devices forequipment and system in 205 shall be carried out.

303 It shall be verified that required signboards are in order.

304 The drainage system of hazardous area shall be sur-

veyed.

305 System and equipment related to drilling shall be sur-veyed. For units being inspected by national authorities withrespect to such items, the survey for classification may normal-ly be considered as covered by this inspection. Statement ofsurvey by national authorities shall be available to the survey-or.

C. Well Intervention Units

C 100 Application

101 The requirements in C apply for units with the class no-tation:

Well Intervention Unit.

C 200 Annual survey

201 The requirements given are to be regarded as supple-mentary to those given for the main class.

202 Supporting structures are to be surveyed with emphasison structural integrity.

203 Where cross connections between piping system forwell intervention operation and safe piping system exist, themeans for avoiding possible contamination of the safe systemwith the hazardous medium are to be surveyed.

204 In hazardous area the following equipment and systemsare to be surveyed and tested, as applicable:

— ventilation including overpressure or flow and alarms— self-closing gastight doors and airlocks including other

openings or access— alarms or shutdown of pressurized equipment— electrical equipment and cables— devices for monitoring of insulation resistance or earth

leak monitoring including alarms— protection devices for combustion engines— emergency shutdown facilities.

205 The following systems to be surveyed and tested for cor-rect functioning if found necessary by the surveyor:

— fire detection system— gas detection system, both flammable and toxic— alarms for abnormal condition— general alarm system and communication between control

stations.

C 300 Complete periodical survey

301 The requirements stipulated in 200 apply with the addi-tional amendments as given in 302 to 305.

302 Function test of instrumentation and safety devices forequipment and system in 205 shall be carried out.

303 It shall be verified that required signboards are in order.

304 The drainage system of hazardous area shall be sur-veyed.

305 System and equipment related to well intervention shallbe surveyed. For units being inspected by national authoritieswith respect to such items, the survey for classification maynormally be considered as covered by this inspection. State-ment of survey by national authorities shall be available to thesurveyor.

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D. Accommodation Unit

D 100 Application

101 The requirements in D apply for units with class nota-tion:

Accommodation Unit.

D 200 Annual survey

201 The requirements shall be regarded as supplementary tothose given for the main class.

202 The accommodation shall be surveyed with attention tostructural strength. The connections of accommodation mod-ules between the modules and to the main supporting structureshall be surveyed.

203 Where the emergency source of power is a generator, thetemporary source of emergency power shall be surveyed andsupply of consumers tested. The automatic operation shall betested.

204 Gangways permanently fitted to the unit shall be sur-veyed with respect to structural integrity and proper function-ing.

D 300 Complete periodical survey

301 The requirements in 200 apply.

E. Crane Unit

E 100 Application

101 The requirements in E apply for units with class nota-tion:

Crane Unit.

E 200 Annual survey

201 The requirements shall be regarded as supplementary tothose given for the main class.

202 An overall survey shall be carried out with particularemphasis on structural integrity, including examination of:

— wire ropes and end attachments— blocks and sheaves— hooks with accessories— shackles— bearings of boom heel and eyebolt connections— securing arrangement for crane during passages— support structure.

203 The slewing system (slewing bearing or hook rollers) in-cluding tightness of bolts shall be examined as required by thesurveyor.

204 Examination and functional testing of the followingshall be performed as found necessary by the surveyor:

— correct adjustment of brakes— resistance measurement of electrical systems— leakages in hydraulic system— safety devices— emergency stop function— fire extinguisher.

205 The load charts, marking and components certificatesshall be verified as available and in order.

E 300 Complete periodical survey301 The requirements given in 200 apply, with the additionsin 302 to 305.

302 Structural parts shall undergo thickness measurementsas deemed necessary by the surveyor.

303 The following components shall be dismantled (openedup) and/or checked by MPI (magnetic particle inspection):

— boom heel bearings— fixed sheaves— blocks— axle pin and housing— eyebolt connections— hooks, ring and balls.

The slewing ring shall be opened up, and internal fillets, race-way and bolts shall be subjected to MPI.

Alternatively:

— slewing bearings may be subject to relevant accepted non-destructive examination in order to check for defects in fil-lets and raceways

— crane with approved securing device (retainer) fitted,opening up is not required

— at least 50% of the holding down bolts shall be drawn andsubjected to MPI.

304 Flatness and condition of bearing mounting flanges shallbe checked.

305 Load testing shall be performed as outlined on Form No.CG 2 in the Rules for Certification of Lifting Appliances.

F. Offshore Support Unit

F 100 Survey arrangement101 Main class requirements as given in Sec.2 shall be com-plied with.

102 Requirements to surveys for applicable additional nota-tions are given in Sec.4.

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SECTION 4PERIODICAL SURVEY EXTENT FOR ADDITIONAL SYSTEM AND SPECIAL

FACILITY NOTATIONS

A. Introduction

A 100 General101 This section presents the standard extent of surveys forretention of additional system and special facility class nota-tions applicable to drilling and offshore support units.

B. Position Mooring Equipment

B 100 Application101 The requirements in B apply for units with class nota-tions:

POSMOORPOSMOOR-VPOSMOOR-TAPOSMOOR-ATA.

B 200 Annual survey201 Accessible and visible parts of the unit's mooring systemfor position keeping on location shall be inspected.

202 Thruster operation shall be function tested for units withsystem notation letters : -TA or -ATA.

B 300 Intermediate survey301 The requirements given in 200 apply with the additionsgiven in 302 to 303.

302 The mooring system for position keeping on locationshall be inspected. This inspection will include dismantlingand non-destructive testing of all joining shackles which havebeen in service for more than 5 years.

The mooring system, including static and dynamic brakes, dur-ing typical anchor handling operations shall be function tested.

303 Units with system notation letters -ATA are to be sur-veyed as given in C as far as is applicable.

B 400 Complete periodical survey401 The requirements given in 200 and 300 apply with theadditions given in 402 and 403.

402 The complete mooring system for position keeping onlocation shall be subject to comprehensive survey, includingopening up and NDT of selected parts of windlasses andwinches and fairleads. Critical parts of all mooring chains orwires and accessories shall be thoroughly visually examinedand subjected to extensive NDT.

403 Windlasses and winches and fairleads, including braketorques, shall be function tested.

C. Dynamic Positioning System

C 100 Application101 The requirements in C apply for units with class nota-tions DYNPOS-AUTS, DYNPOS-AUT, DYNPOS-AUTRand DYNPOS-AUTRO.

C 200 Complete periodical survey201 All sensors, peripheral equipment and reference systems

shall be tested to verify correct operation and adequate accura-cy as compared to previous calibration or specifications.

202 Failures of sensors shall be simulated to check the alarmsystem and the switching logic.

Acoustic reference systems shall be tested with thrusters in op-eration.

Switch-over between reference systems acting as input to con-troller shall be performed to assure that warnings, alarms andinformation to operator are satisfactory. Off-location alarmshall be demonstrated.

203 Each thruster shall be tested with a range of pitches orspeed, and the indicating instruments for speed, pitch and azi-muth are to be observed and verified to be of adequate accura-cy.

The different modes of thruster control shall be tested for:

— manual control of pitch or speed and azimuth— remote thrust control— controller (automatic) control— transfer of control.

The remote thrust control system shall be tested with the refer-ence system in operation.

The system shall be capable of keeping the unit in position (notexceeding position boundaries, off-location alarm).

204 Survey of the thruster unit shall be carried out as forthrusters for propulsion.

Guidance note:Survey of the thrusters requires docking of the unit and should beharmonised with the bottom survey.


205 Prime movers for thrusters shall be opened if found nec-essary by the surveyor.

206 The electrical installation serving the dynamic position-ing system shall be examined.

207 The automatic reconnection system for generators andconsumers connected to the bus bar system(s) shall be tested(simulated test may be accepted).

Power failure to the different sub-systems shall be simulated toverify the intended functioning.

208 The complete dynamic positioning system shall normal-ly be tested in all operational modes, with simulation of differ-ent failure conditions to enable test of switching of modes,back-up systems, and the alarm system.

Manual override shall be demonstrated during both normal op-eration and failure conditions.

D. Drilling Plant

D 100 Application101 The requirements in D apply for units with class nota-tion: DRILL.

D 200 Annual survey201 Drilling related equipment, structures and systems shallbe surveyed, with particular attention to the structural integri-ty, fire or explosion hazards and personnel protection. Run-

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ning tests, NDT and/or opening of equipment shall beperformed as considered necessary by the surveyor.

202 Overhead drilling equipment and lifting appliances fordrilling and associated operations shall be surveyed, with par-ticular emphasis on structural integrity. Examination and func-tional testing shall be carried out as found necessary by thesurveyor, for example safety devices and emergency stop func-tion. The marking (SWL) shall be verified as acceptable.

203 Wire ropes (including end attachments) and sheaves ofthe tensioning drilling and associated systems shall be sur-veyed. If deemed necessary by the surveyor, checking by NDTshall be carried out.

204 Pressure vessels shall be externally surveyed. The gen-eral condition of the pressure vessel including mountings, pip-ing and possible insulation shall be ascertained. The surveyormay require opening or internal survey or thickness measure-ments and/or crack detection test, if found necessary.

Safety valves, instrumentation and automation systems shallbe surveyed and tested in operating condition as required bythe surveyor. Liquid level controls on tanks or separators shallalso be tested.

205 Piping systems including flexible pipes shall be sur-veyed. Thickness measurements shall be carried out asdeemed necessary by the surveyor. Safety valves shall be sur-veyed and tested as deemed necessary by the surveyor.

206 The mud and cement system shall be surveyed. Pumpsshall be externally surveyed and function tested.

207 Marine riser joints (as far as accessible) and diverter sys-tem shall be visually surveyed and inspected for corrosion,cracks and wear. Thickness measurements may be required bythe surveyor.

208 The blowout preventers shall be surveyed and pressuretested according to a recognised code or, if not accessible, a re-view of records or test log shall be performed.

209 The well testing system shall be surveyed.

D 300 Complete periodical survey301 The requirements given in 200 apply, with the additionsgiven in 302 to 308.

302 Derrick and flare boom installations shall be examined,with emphasis on the structural condition of bracings and withrespect to deformation and slack or loose bolts (if of bolted de-sign). Thickness measurements and/or NDTof main structuralcomponents and checking of bolts after dismantling may be re-quired as deemed necessary by the surveyor.

303 Main loading parts of overhead drilling equipment shallbe checked by MPI (magnetic particle inspection). Structuralparts shall undergo thickness measurements deemed necessaryby the surveyor.

API RP 8B may be used as guidance.

Thickness measurements and NDT for main structural parts ofthe lifting appliances shall be carried out as deemed necessaryby the surveyor. Lifting appliances (except overhead drillingequipment and BOP handling equipment) shall be load tested,as stated in the Rules for Certification of Lifting Appliances.

304 Pressure vessels shall be surveyed internally. If internalsurvey is not practical, thickness measurements shall be taken.Pressure vessel related equipment, such as valves, pipes, etc.,shall be examined. The correct setting and any remote opera-tion of safety valves shall be examined. Pressure testing to themaximum allowable working pressure shall be performed.

305 Mud and cement pump fluid ends shall be surveyed andchecked for cracks in critical areas.

306 The marine riser system, including diverter system andchoke and kill lines, shall be surveyed. Liquid penetrants orMPI methods shall be used to investigate critical areas for

cracks. Thickness measurements may be required if found nec-essary by the surveyor. Choke and kill lines shall be pressuretested to the maximum allowable working pressure.

307 The blow-out preventer system shall be subject to com-plete performance test, including pressure testing to the maxi-mum allowable working pressure. Records of overhaul shall bereviewed.

For class notation DRILL(N) there shall be complete overhauland test of the BOP at intervals of 5 years.

308 Piping systems including flexible pipes shall be pressuretested to the working pressure.

E. Helicopter Deck

E 100 Application101 The requirements in E apply for units with class nota-tion:

HELDKHELDK-SHELDK-SH.

E 200 Complete periodical survey201 All surveys of the helicopter deck arrangement shall beconcurrent with the complete periodical survey of the hull.

202 An overall survey shall be carried out with particularemphasis on the structural integrity of the deck with supportingstructure, and is normally to include examination of the fol-lowing components and arrangements:

— drainage arrangements— surface protection on wooden decks— safety net— lashing arrangements for the helicopter— arrangements for the prevention of sliding— helicopter deck including support— fire safety installation (S, SH)— communication equipment (S, SH)— obstacles and marking (SH).

F. Well Test

F 100 Application101 The requirements in F apply for units with class nota-tion:

WELLTEST.

F 200 Surveys201 Survey requirements given for class notation PROD inDNV-OSS-102 shall be applied, as applicable.

G. Temporary Oil Storage

G 100 Application101 The requirements in G apply for units with class nota-tion:

TEMPSTORE.

G 200 Annual survey201 The surveys required in 202 and 203 shall be carried outconcurrently with the annual survey for main class.

202 The survey shall include a general examination of:

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— tanks— pumping and piping systems— ventilation system— bulkheads with respect to tightness— electrical equipment in gas dangerous zones— inert gas arrangement, if installed.

203 The following components and systems shall be sur-veyed and tested for correct functioning:

— pressure/vacuum relief valves— emergency stop of pumps— quick release of transfer hose— tank high level alarms.

204 Insulation resistance of electrical cables shall be meas-ured. The measurement may be omitted provided a record oftesting is available showing that measurements have been tak-en during the last 12 months with satisfactory results.

G 300 Complete periodical survey301 The requirements in 200 apply with the additions givenin 302 to 305.

302 All storage tanks shall be internally examined. The tanksshall be hydrostatically, hydropneumatically or otherwisepressure tested to their MARVS (Maximum allowable reliefvalve setting).

303 If fitted, heating coils, anodes, tank cleaning apparatusand other equipment in cargo tanks and cofferdams shall besurveyed. Heating coils shall normally be pressure tested.

304 Cargo pumps, pipes, valves, inert gas arrangement, etc.together with the pump’s prime movers shall be surveyed asspecified in Sec.2.

305 Electrical equipment in gas-dangerous zones shall besurveyed and insulation resistance checked.

H. Crane

H 100 Application101 The requirements in H apply for units with class nota-tion:.

CRANE.

H 200 Annual survey201 The following survey requirements shall be carried outconcurrently with the annual survey for main class.

202 An overall survey shall be carried out with particularemphasis on structural integrity, including examination of:

— wire ropes and end attachments— blocks and sheaves— hooks with accessories— shackles— bearings of boom heel and eyebolt connections— securing arrangement for crane during passages— support structure.

203 The slewing system (slewing bearing or hook rollers) in-cluding tightness of bolts shall be examined as required by thesurveyor.

204 Examination and functional testing of the followingshall be performed as found necessary by the surveyor:

— correct adjustment of brakes— resistance measurement of electrical systems— leakages in hydraulic system— safety devices— emergency stop function

— fire extinguisher.

205 The load charts, marking and components certificatesshall be verified as available and in order.

H 300 Complete periodical survey

301 Structural parts shall undergo thickness measurementsas deemed necessary by the surveyor.

302 The following components are to be dismantled (openedup) and/or checked by MPI (magnetic particle inspection):

— boom heel bearings— fixed sheaves— blocks— axle pin and housing— eyebolt connections— hooks, ring and balls.

The slewing ring shall be opened up, and internal fillets, race-way and bolts shall be subjected to MPI.

Alternatively:

— slewing bearings may be subject to relevant accepted NDTin order to check for defects in fillets and raceways

— crane with approved securing device (retainer) fitted,opening up is not required

— at least 50% of the holding down bolts shall be drawn andsubjected to MPI.

303 Flatness and condition of bearing mounting flanges shallbe checked.

304 Load testing shall be performed as outlined in Form No.CG 2 in the Rules for Certification of Lifting Appliances.

I. Diving Systems

I 100 Application

101 The requirements in I apply for units with class nota-tions:

DSV-I SF

DSV-II SFDSV-III SF.

I 200 Annual survey


— calibration of essential instrumentation (depth gauges, gasanalysers etc.)

— switching from main to emergency electrical power sup-ply

— emergency systems including bell emergencies (buoyancyif applicable)

— function test of the handling system— partly dismounting of heat protection and penetrators on

the bell may be required.

Detailed specification of test requirements are given in the rel-evant sections of the Rules for Certification of Diving Sys-tems.

I 300 Intermediate survey

301 The requirements given in 200 apply subject to the fol-lowing addition:

The following tests are to be carried out:

— gas leak tests— testing of safety valves

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— functional test of fire detection-, alarm- and extinction sys-tems

— functional tests of life support systems— functional tests of alarm systems— functional tests of mechanical and electrical systems.

I 400 Complete periodical survey401 The requirements given in 200 and 300 apply with theadditions given in 402 to 407.

402 Bell buoyancy materials, heat protection, penetrators,windows and attached members shall be dismounted for in-spection for possible corrosion and deterioration.

403 Pressure tests and inspections shall be carried out ac-cording to Table H1. The test pressure shall be as stamped onthe pressure vessels.

The pressure tests and inspections of gas containers shall becarried out according to an approved test program.

Guidance note:Hydro-test covers thorough visual inspection, internally and ex-ternally.For decompression chambers and diving bells, provided a satis-factory internal inspection is carried out, the first interval may beextended to 10 years following a 1.1 x maximum working pres-sure pneumatic pressure test adopting the safety precautions inPD 5500, 5.8.4.1. Note that there may be a fire risk with air athigh pressure.For gas storage cylinders, provided the internal inspection re-veals no corrosion, the interval may be prolonged to 10 years.See BS 5430, Part 1.Acoustic emission testing in lieu of hydrostatic testing of gasstorage tubes may normally not be accepted. Procedures for testing along with qualifications etc. should besubmitted well in advance for review.


404 The working mass of the bell shall be checked.

405 Diving bell handling systems shall be subject to staticload testing.

406 If applicable, the bell's releasable ballast system with at-tachments shall be structurally tested with a static load of 1.5times the mass of the ballast in air.

407 Viewports, 10 years old or more, shall be replaced.

J. De-icing or Anti-icing Systems

J 100 Application101 The requirements in J apply for units with class nota-tions:

DEICEDEICE-C.

J 200 Annual survey201 Visual inspection of anti-icing and de-icing switch-boards and confirm heating load on each circuit according to

marking on the switchboards.

202 Examination of equipment for de-icing and anti-icing in-cluding:

— heaters— covers— equipment for manual de-icing— radar equipment— heating coils— steam tracing lines.

K. Periodically Unattended Machinery Space and Machinery Centrally Operated

K 100 Application101 The requirements in K apply for units with class nota-tions:

E0ECO.

K 200 Annual survey201 The surveyor shall verify that systematic maintenanceand functional testing of instrumentation has been performedand documented.

The general condition of the following shall be to the satisfac-tion of the surveyor:

— installation of instrumentation equipment with regard toelectrical and mechanical condition, labels, signboardsetc.

— control panels— local indicating instruments.

202 Correct functioning of the following systems shall beverified:

— alarm systems— safety systems— remote control systems— automatic control systems— emergency lighting systems in engine room— communication systems— fire alarm and fire protection systems.

K 300 Complete periodical survey301 The requirements given in 200 apply, subject to the ad-ditions given in 302 to 305.

302 Correct functioning of the various parts of the followingsystems shall be verified to the satisfaction of the surveyor:

— each alarm system— each safety system— each fire detector— automatic control loops— manual control of machinery.

303 The following manoeuvres shall be undertaken for sur-vey of remote control of propulsion machinery:

— from stop to ahead— from ahead to astern— stop— from stop to astern— stop by operating the emergency device.

304 The surveyor shall verify effective transfer from remotecontrol to stand-by manual control in the engine room in caseof power supply failure to the remote control system.

305 Where provided, cancelling of automatic load reduction

Table H1 Pressure testsComponent Maximum interval between

each inspection and pressure testing(years)

Gas containers Bell, chambers

5 or 10 1) 5 or 10 2)

1) Interval for hydraulic pressure testing of gas containers may be extend-ed to 10 years if the internal inspection reveals no corrosion.

2) Interval for hydraulic pressure testing of bell and chambers may be ex-tended to 10 years if a pneumatic leakage test to 1.1 times the maximum working pressure is carried out at the complete periodical survey.

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and/or automatic stop of engine functions shall be demonstrat-ed to the satisfaction of the surveyor.

L. Additional Fire Protection

L 100 Application

101 The requirements in L apply for units with class nota-tions:

F-AF-MF-AM.

L 200 Complete periodical survey, all F-class notations

201 Fire pumps including emergency fire pump and primemovers shall be surveyed and tested.

202 Fireman's outfit and compressors for charging the airbottles, shall be surveyed.

L 300 Complete periodical survey, F-A301 The requirements in 200 apply, with the following addi-tions:

— fire retarding partitions in the accommodation shall be sur-veyed

— hose stations, together with their equipment, in the accom-modation, shall be surveyed

— automatic fire-detecting and alarm systems including re-lease arrangement for self-closing doors in passageways,stairways and machinery casings shall be surveyed andtested.

L 400 Complete periodical survey, F-M401 The requirements in 200 apply with the following addi-tions:

— main and local extinguishing systems in engine and boilerrooms including detection and alarm arrangements shallbe surveyed and tested. The quantity of extinguishing me-dium shall be checked

— portable dry powder fire extinguishers, and spare chargesshall be checked

— hose stations in the engine and boiler rooms together withtheir equipment shall be surveyed.

L 500 Complete periodical survey, F-AM501 The requirements in 300 to 400 apply.

M. Fire Fighters

M 100 Application

101 The requirements in M apply for units with class nota-tions:

FIRE FIGHTER IFIRE FIGHTER IIFIRE FIGHTER III.

M 200 Complete periodical survey FIRE FIGHTER I201 Water spray plant for self protection, including pumps,pipes and nozzles, shall be surveyed and tested.

202 Pumps for water monitors including their prime moversshall be surveyed and tested at maximum capacity. Remotecontrol of monitors including valve operation shall be tested.

203 Hoses with their equipment shall be surveyed and tested.

204 Fireman's outfit and compressors for charging the airbottles shall be surveyed.

205 Floodlights shall be tested.

206 It shall be verified that the required operation manual isin order.

M 300 Complete periodical survey FIRE FIGHTER II301 In addition to the requirements in 200, the mobile gener-ator for foam production with its equipment shall be surveyed.

M 400 Complete periodical survey FIRE FIGHTER III401 In addition to the requirements given in 300, the fixedfoam monitors with foam production equipment and remotecontrol shall be surveyed.

N. Integrated Computer Systems

N 100 Application101 The requirements in N apply for units with class nota-tion:

ICS.

N 200 Complete periodical survey201 All surveys of integrated computer systems shall be con-current with the survey of instrumentation and automation sys-tems for class notation E0.

202 The installation shall be visually examined, and the sys-tems shall be tested as follows:

— at workstations, relevant pages shall be called onto thescreen. The pages shall be checked for relevance and com-pared to the instruction material

— active control and manipulation of a selection of parame-ters shall be demonstrated from two or more workstations

— protection of systems against interference from unauthor-ised personnel shall be demonstrated.

O. Hull Monitoring System

O 100 Application101 The requirements in O apply for units with class nota-tions:

HMON-1HMON-2.

O 200 General201 The purpose of the survey is to ensure the maintenanceof the hull monitoring system as specified for the class nota-tion.

202 The operation manual shall be available to the attendingsurveyor during periodical surveys. In addition to the manualthe following documents shall be available:

— arrangement and layout— test program for software— in-service test program— maintenance procedures.

O 300 Annual survey301 The operation of the hull monitoring system shall be ver-ified by a DNV surveyor:

— to ensure that the value of the stress as defined is compat-ible with the output of the loading instrument for the cur-rent condition

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— by examination of the recorded data for compliance withthe requirements.

302 The monitoring system shall be calibrated annually. Thecalibration shall be verified by a DNV surveyor.

303 It shall be verified that the following items are availableand in order:

— calibration certificates and recommendations for all rele-vant components of the monitoring system

— operations manual.

P. Safety and Environmental Protection Management System

P 100 Application

101 The requirements in P apply for units with class nota-tion:

SBM.

P 200 Survey requirements

201 Surveys shall be in compliance with the Rules for Clas-sification of Ships, Pt.7 Ch.5.

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Offshore Service Specification DNV-OSS-101, April 2002Ch.3 App.A –

APPENDIX AINTRODUCTION TO OFFSHORE CLASSIFICATION

A. Introduction

A 100 Purpose

101 This appendix is informative and should not be under-stood as rule requirements. The appendix explains the systemof classification, how it works, conditions of validity, and itsinteraction with statutory control. This information is to a largeextent implied by the rules, but a brief clarification of the es-sential points in one place is considered useful.

B. The Classification System

B 100 The classification process and its limitations

101 Classification is a system for safeguarding life and prop-erty at sea, and the environment due to operational conse-quences. It implies a process of verifying offshore objectsagainst a set of requirements. The requirements are laid downin the rules and standards established by DNV. Classificationhas gained worldwide recognition as an adequate level of safe-ty and quality.

102 Classification implies an activity, in which an offshoreunit is surveyed during construction based on design approval,tested before being taken into service, and surveyed regularlyduring its whole operational life until it is scrapped. The aim isto verify that the required rule standard is built in, observed andmaintained.

103 Classification is not performed as a substitute for the cli-ent's own quality and safety control and related duties, or theclient's obligations to third parties, nor to relieve the client ofany consequences of default. Classification implies that rulerequirements are verified at regular intervals. It is the owner'sresponsibility to maintain the unit so as to comply with therules at all times.

104 DNV keeps complete files on all classed ships and off-shore units covering the documentation required by the rules.Reports will not be disclosed to any party, apart from the na-tional authorities involved, without the owner's consent. DNValso undertakes all reporting to national authorities required inconnection with the safety certificates.

B 200 Who needs classification?

201 Classification serves as verification system for a numberof parties who have special interest in the safety and quality ofoffshore units, such as:

— National authorities, who accept units for registry, or letunits into their territorial waters, need assurance that theyare safe and represent a minimum hazard to their sur-roundings.

— Insurance underwriters require offshore units to be classedin order to give insurance.

— Owners, who need the technical standard of the rules asbasis for building contracts and to document the unit'sstandard when seeking insurance or financing, or whenhiring out or selling the unit.

— Building yards and sub-contractors use the rules as a toolfor design and construction, as required by their client.

— Finance institutions use classification as a documented in-dicator of the unit's value.

— Charterers require confirmation of the unit's standard be-fore hire.

B 300 Recognition of DNV301 DNV is recognised as an international classification so-ciety by virtue of its position in the marine industry, foundedon the following criteria:

Independence

— By classing a substantial share of the world fleet andthrough high equity and financial independence, the eco-nomic basis for independent decisions in classificationmatters is ensured.

High technical competence

— Extensive research and development in class related fieldssustain a process where the rules and standards are contin-uously extended and improved in pace with new technol-ogy and experience gained. Research and developmentalso contributes to a high level of staff competence.

— Continuous monitoring of a large classed fleet ensures val-uable feedback from casualties, damage incidents and op-erational experience in general. Analyses of these data areone important source of improvements of the rules.

— DNV runs a scheme for training and qualification of itstechnical personnel to ensure correct, uniform quality ofapproval and survey work throughout the organisation.

Worldwide survey station network

— DNV operates survey stations all over the world. Efficientreporting and information systems support the operations,and provide service to clients and national authorities.

B 400 Responsibility for safety at sea401 National law institutes national authorities' responsibili-ty for the total safety control of offshore units flying the nation-al flag. Classification cannot in any way relieve the nationalauthorities of that responsibility.

402 National authorities may use the classification systemand DNV's worldwide survey station network as their execu-tive branch for safety control. The convenience of this arrange-ment is proved by the fact that DNV has been delegatedextensive authorisation to work and certify on behalf of themajority of the maritime nations of the world.

403 The classification system applied to delegated, statutorywork offers the national authorities regular monitoring of sur-vey and certificate status of offshore units flying their flag.Verification of DNV's work process and quality systems mayalso be carried out. In this way, national control is retained atthe discretion of the authority involved.

B 500 Classification of newbuildings501 The builder initiates the process by submitting a requestfor classification to DNV. In response to a list of documenta-tion issued by DNV for the specific class notations requested,the builder and sub-suppliers submit drawings, specifications,related technical descriptions and data, including specificationof materials as required by class, for approval.

After examining the above documents, DNV informs thebuilder and sub-supplier whether the design and arrangementof structure, machinery and equipment is acceptable. If not,DNV may propose modifications needed to meet the classifi-cation requirements

502 During the building period DNV carries out surveys atthe building yard and its suppliers. The method and extent ofsurvey will be decided by DNV based on the acceptance of

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Offshore Service Specification DNV-OSS-101, April 2002 – Ch.3 App.A

their quality system.

The purpose of the surveys is to verify that the construction,components and equipment satisfy the rule requirements andare in accordance with the approved plans, that required mate-rials are used, and that functional tests are carried out as pre-scribed by the rules.

503 When DNV is satisfied that the requirements specifiedfor the offshore unit in question have been met, the appropriateclass notation will be assigned and confirmed by the issuanceof a classification certificate. Provided the requirements for re-tention of class are complied with, the certificate will normallyhave a validity of five years.

B 600 Classification in the operational phase601 Compliance with the rule requirements in the operation-al phase is verified by DNV through a system of periodical sur-veys. The most comprehensive survey is the one carried out inconnection with the renewal of the five-yearly classificationcertificate. During the five year period the unit undergoes an-nual and intermediate surveys covering various parts, equip-ment and systems, depending on the class assigned.

602 In order to confirm retained validity of class, DNV eval-uates the extent of possible sustained damage and verifies en-suing repairs. Deferred repairs may be accepted by DNV, butalways associated with a maximum time limit.

603 The rules allow periodical surveys to contain an elementof sampling. This sampling must be sufficient to enable thesurveyor to obtain a proper assessment of the condition of theunit. This assessment is based amongst other things on type,age and technical history of the unit.

604 Results of the surveys are reported to the owners and toDNV's central office for updating records. Special findings arealso recorded and used as basis for updating and developmentof the rules.

605 "The register of vessels classed with DNV" is availablefor supplying information on ship's and offshore unit's mainparticulars and details of their classification.

B 700 Owner's duties701 In order to maintain valid class the classification systemspecifies the following to be observed by the owner:

— The unit has to be competently handled in accordance withthe rules.

— The unit has to be maintained to rule standard at all times.Any conditions of class have to be carried out as specified.

— The unit has to undergo prescribed periodical and renewalsurveys, as well as surveys of damage, repairs, conver-sions and alterations.

— DNV must be furnished with all information that may in-fluence its decisions in connection with classification.

Failure to meet any of these requirements may lead to termina-tion of valid class and withdrawal of all class and statutory cer-tificates.

702 To assist the owner in this regard DNV supplies regularstatus reports on certificates, surveys carried out and becomingdue, and possible conditions of class.

C. Remuneration

C 100 Fee system

101 Remuneration is normally based on a fee system, inwhich DNV invoices each type of survey according to a basicscale of fees. The basic scale of fees is developed by takinginto consideration the amount of work needed to execute, proc-ess and follow up the survey in question, as well as the itemssurveyed. The fees also cover investment and developmentcosts of the rules as well as maintenance of a worldwide surveynetwork, central service support system, etc. Price level andcosts vary from country to country and are therefore reflectedin the fees charged.

D. Classification Support

D 100 General

101 The staff of DNV represents a significant accumulationof knowledge and practical experience in offshore-relatedtechnical fields. This is an asset often drawn on by the industryin matters related to classification.

102 The expertise of DNV is available to the owner at anytime when needed in connection with operating problems,damage and casualties.

D 200 Pre-contract support

201 Co-operation with DNV early in the design stage, beforeclassification is requested and any contract is signed, is usuallyvery beneficial to both yard and owner. Different technical so-lutions may be evaluated, thus contributing to a more efficientunit, and ensuring that all safety aspects as specified by therules are taken care of. In this way, expensive changes late in aproject may be avoided.

D 300 In-service support

301 Similar services are given in connection with units in op-eration. Alternative ways of repairs may be indicated, accept-able distributions of crude cargo and ballast to alleviateoverstressing may be computed in case of damage, stabilitymay be investigated, etc. These are typical examples.

D 400 Limitations

401 Two main restrictions prevail on DNV when undertak-ing classification support work:

— DNV does not carry out complete, conceptual design ofoffshore units. In cases where DNV has been involved indesign support, the plans and calculations must still be in-dependently evaluated by DNV before being accepted forclassification purposes.

— Information received from clients in connection with as-signment of class is not disclosed and used in classifica-tion support work.

OSS-101 - Rules for Classification of Offshore Drilling Units

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Transcript of OSS-101 - Rules for Classification of Offshore Drilling Units