DNV-OSS-104 - Rules for Classification of Self-Elevating Units 2012

8/9/2019 DNV-OSS-104 - Rules for Classification of Self-Elevating Units 2012

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OFFSHORE SERVICE SPECIFICATION

DETNORSKEVERITASAS

The content of this service document is the subject of intellectual property rights reserved by Det Norske Veritas AS (DNV). The useraccepts that it is prohibited by anyone else but DNV and/or its licensees to offer and/or perform classification, certification and/orverification services, including the issuance of certificates and/or declarations of conformity, wholly or partly, on the basis of and/orpursuant to this document whether free of charge or chargeable, without DNV's prior written consent. DNV is not responsible for theconsequences arising from any use of this document by others.

The electronic pdf version of this document found through http://www.dnv.com is the officially binding version

DNV-OSS-104

Rules for Classification ofSelf-Elevating Units

APRIL 2012


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FOREWORD

DET NORSKE VERITAS (DNV) is an autonomous and independent foundation with the objectives of safeguarding life,property and the environment, at sea and onshore. DNV undertakes classification, certification, and other verification andconsultancy services relating to quality of ships, offshore units and installations, and onshore industries worldwide, andcarries out research in relation to these functions.

DNV service documents consist of among others the following types of documents:

Service Specifications. Procedural requirements.

Standards. Technical requirements. Recommended Practices. Guidance.

The Standards and Recommended Practices 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

H) Marine Operations

J) Cleaner EnergyO) Subsea Systems

Det Norske Veritas AS April 2012

Any comments may be sent by e-mail to [email protected]

If any person suffers loss or damage which is proved to have been caused by any negligent act or omission of Det Norske Veritas, then Det Norske Veritas shall pay compensation tosuch person for his proved direct loss or damage. However, the compensation shall not exceed an amount equal to ten times the fee charged for the service in question, provided thatthe maximum compensation shall never exceed USD 2 million.In this provision "Det Norske Veritas" shall mean the Foundation Det Norske Veritas as well as all its subsidiaries, directors, officers, employees, agents and any other acting on behalfof Det Norske Veritas.


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Offshore Service Specification DNV-OSS-104, April 2012

Changes Page 3

CHANGES

General

This is a new document.

These new rules was approved by the Executive Committee in April 2012.

The rules come into force 1 October 2012.




Contents Page 4

Table of contents

PART 0 INTRODUCTION ..................................................................................... 5

CHAPTER 1 INTRODUCTION .........................................................................................................6

CHAPTER 2 CONTENTS IN DETAIL .............................................................................................10

PART 1 GENERAL REGULATIONS AND CONDITIONS.................................. 18

CHAPTER 1 CLASSIFICATION PRINCIPLES ...............................................................................19

CHAPTER 2 PROCEDURES ......................................................................................................... 21

CHAPTER 3 PRINCIPLES AND CONDITIONS .............................................................................22

PART 2 MATERIALS AND WELDING ............................................................... 25

CHAPTER 1 METALLIC MATERIALS ........................................................................................... 26

CHAPTER 2 STRUCTURAL FABRICATION .................................................................................27

PART 3 HULL AND EQUIPMENT ...................................................................... 28

CHAPTER 1 STRUCTURAL DESIGN ............................................................................................29

CHAPTER 2 STABILITY AND WATERTIGHT INTEGRITY ........................................................... 36

CHAPTER 3 TOWING ....................................................................................................................40

PART 4 MACHINERY SYSTEMS AND EQUIPMENT........................................ 42

CHAPTER 1 MARINE, MACHINERY AND PIPING SYSTEMS .....................................................43

CHAPTER 2 ELECTRICAL INSTALLATIONS ................................................................................55

CHAPTER 3 AREA ARRANGEMENTS .........................................................................................63

CHAPTER 4 CONTROL AND COMMUNICATION SYSTEMS ...................................................... 68

CHAPTER 5 FIRE PROTECTION ..................................................................................................73

CHAPTER 6 ENHANCED CONTROL & SAFETY SYSTEMS .......................................................77

PART 5 CERTIFICATION ................................................................................... 80

CHAPTER 1 PROCEDURES ......................................................................................................... 81

CHAPTER 2 MACHINERY AND SYSTEM CERTIFICATION ........................................................ 82

PART 6 NEWBUILDING SURVEY ..................................................................... 90

CHAPTER 1 INTRODUCTION .......................................................................................................91CHAPTER 2 SURVEY PLANNING .................................................................................................92

CHAPTER 3 FABRICATION OF STRUCTURES ...........................................................................94

CHAPTER 4 COMMISSIONING PROCESS ..................................................................................95

CHAPTER 5 DELIVERABLES ........................................................................................................97

PART 7 CLASSIFICATION IN OPERATION...................................................... 98

CHAPTER 1 INTRODUCTION .......................................................................................................99

CHAPTER 2 GENERAL PROVISIONS AND REQUIREMENTS FOR SURVEYS .......................100

CHAPTER 3 PREPARATION AND PLANNING .......................................................................... 104

CHAPTER 4 PERIODICAL SURVEYS .........................................................................................107

CHAPTER 5 OTHER SURVEYS ..................................................................................................113

CHAPTER 6 PERMANENTLY INSTALLED SELF-ELEVATING UNITS ......................................115


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DETNORSKEVERITASAS


Page 5

PART 0 INTRODUCTION




Pt.0 Ch.1 Sec.1. General Page 6

CHAPTER 1 INTRODUCTION

Section 1. General

The Classification Rules for design and construction of self-elevating units can be found in the applicablerequirements of DNV Offshore standards and MODU Rules. Recognizing that these standards are generic innature, both in the topics covered and in the actual requirement description, there is an opportunity to constructan abstract of these with a focus on self-elevating unit relevant requirements.

Section 2. Objective

The objective of this publication is to give a complete but concise overview of the relevant technical standardsand DNVs involvement for building and classing a conventional self-elevating unit. In this objective, the bookis to be used in conjunction with DNV Offshore Service Specification OSS-101 and the relevant technicalstandards as referred to therein.

Section 3. Scope

This publication describes the technical and procedural requirements for classification of self-elevating unitsof a conventional design as covered by main class. Both the description of a conventional design and the scopeof main class is further detailed in Part 1.

This publication covers the involvement of class for a units different phases during life time, i.e. design,construction, commissioning, delivery and operation.

The publication does not cover the requirements for separate additional class notations, nor the requirementsfor units of an unconventional design. These are detailed in DNVs Offshore Service Specification OSS-101.

Section 4. Structure

To maintain a clear overview, these rules consist of references to the relevant Offshore Standards, ServiceSpecifications and other DNV Service Documents. The degree of reference detail is depending on the natureof the subject. To improve readability and understanding, the references are completed with a direct descriptionof requirements. In special, a description has been included on topics of a higher complexity or risk.

The first part of these Rules describes the principles of Classification and its procedures in chapter 1 and 2. Thethird chapter of this part continues thereafter with the overall technical principles as applicable for the designof a self-elevating unit build under DNV Classification.

The technical requirements together with relevant calculations methods are discussed in detail in Parts 2 to 4.The three parts cover the main technical areas of class, subsequently Materials and Welding, Hull andEquipment and Machinery and Systems.

Part 5 to 7 thereafter give a concise overview for specific phases of class involvement, that is respectively inthe Component and System Certification process, the new building mechanical completion and commissioning

and conclusively survey and test requirements in the operational phase after delivery.For a clear separation between the content of this publication and other DNV Rules, Standards or other servicedocuments, references to parts, chapters and sections refer this publication if not explicitly stated otherwise.

Section 5. Definitions

5.1 Verbal forms

Shall:Indicates a mandatory requirement to be followed for fulfillment or compliance with the present servicespecification. Deviations are not permitted unless formally and rigorously justified, and accepted by all relevantcontracting parties.

Should: Indicates that among several possibilities one is recommended as particularly suitable, without

mentioning or excluding others, or that a certain course of action is preferred but not necessarily required. Otherpossibilities may be applied subject to agreement.

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

Will:Indicates a mandatory action or activity to be undertaken by DNV. (Ref. shall for other parties).




Pt.0 Ch.1 Sec.5. Definitions Page 7

5.2 Definitions

Approval or approved: Denotes acceptance by DNV of documentation showing design solutions, arrangementsand equipment that complies with the Rules.

Assessment: An Act of assessing, appraising or evaluating a condition of a product, process or system.

Builder:Signifies the party contracted to build a vessel in compliance with the Society's rules.

Certificate:A document confirming compliance with the Society's rules or with other rules and regulations forwhich the Society has been authorized to act.

Certification:A service confirming compliance with applicable requirements on the date that the survey wascompleted.

Certification of materials and components (CMC):The activity of ensuring that materials, components andsystems used in vessels to be classed by the Society comply with the rule requirements. The scope ofclassification re-quires that specified materials, components and systems intended for the vessel are certified.Depending on the categorisation, certification may include both plan approval and survey during productionand/or of the final product.

Class:Class is assigned to and will be retained by vessels complying with applicable requirements of theSociety's rules.

Classification:A service which comprises the development of independent technical standards for vessels -class rules and standards, and to verify compliance with the rules and standards throughout the vessels' life.

Close-up examination:An examination where the details of structural components are within the close visualinspection range of the surveyor, i.e. preferably within reach of hand.

Commissioning: A process of assuring that components, equipment and the systems are functioning inaccordance with the functional requirements.

Concurrent surveys: Surveys required to be concurrently completed shall have the same date of completion. Asurvey required to be carried out in conjunction with or carried out as part of another survey shall be completedon or before the completion of the other survey, however, within the time window for that survey.

Condition of Class (CC):Constitutes a requirement that specific measures, repairs or surveys shall be carriedout within a specific time limit in order to retain class.

Condition on behalf of the flag administration (CA): Constitutes specific measures, repairs or surveys that shallbe carried out within a specific time limit in order to retain the statutory certificate. A CA will be issued only

when the Society has been authorised to carry out statutory surveys on behalf of the flag ad-ministration.Contract: The specific agreement between DNV and the client. It defines the extent of services requested bythe customer, and is concerned with:

the classification of vessels or installations, both new buildings and in operation statutory work carried out on behalf of national maritime authorities equipment and materials.

Critical structural areas:Areas that have been identified from calculations to require monitoring or from theservice history of the subject vessel or from similar or sister vessels to be sensitive to cracking, buckling orcorrosion which would impair the structural integrity of the vessel.

Customer:Signifies the party who has requested the Society's service.

Designer: Signifies a party who creates documentation submitted to the Society for approval or information.

Det Norske Veritas (DNV):An autonomous and independent foundation with the purpose of safeguarding life,property and the environment. The foundation operates through the limited company Det Norske Veritas AS,which is registered in Norway and operates through a worldwide network of offices.

ESD:Emergency Shut Down.

Essential services see Safety systems

Exceptional circumstances means unavailability of dry-docking facilities; unavailability of repair facilities;unavailability of essential materials, equipment or spare parts; or delays incurred by action taken to avoidsevere weather conditions.

Flag administration: The maritime administration of a vessel's country of registry.

FMECA: Failure Mode Effect and Consequence Analysis.

FUI:Fatigue Utilisation Factor.

Contain advice which is not mandatory for the assignment or retention of class, but with which the Society, inlight of general experience, advises compliance.

IACS:The International Association of Classification Societies. Unified rules, interpretations, guidelines andrecommendations may be found on www.iacs.org.uk.





IMO:The International Maritime Organization.

Independent tank: Self-supporting tank which does not form part of the vessel's hull and does not contribute tothe hull strength.Independent gravity tank is a tank with design vapour pressure not exceeding 0.7 bar.Pressure vessel is a tank with design gas or vapour pressure exceeding 0.7 bar.

ISO: Signifies the International Organisation for Standardization.

HP: High Pressure.Manufacturer: Signifies the entity that manufactures the material or product, or carries out part production thatdetermines the quality of the material or product, or does the final assembly of the product.

Mechanical Completion (MC):Verification that the components, equipment and the systems are constructed,installed and tested in accordance with applicable drawings and specifications and are ready for testing andcommissioning in a safe manner.

Memorandum to Owner (MO):Constitutes information related to the ship, its machinery and equipment or torule requirements. A MO will be issued in relation to information that does not require any corrective action orsurvey.

OEM:Original Equipment Manufacturer.

Overall examination:An examination intended to report on the overall condition of the structure.

Plan approval:Signifies a systematic and independent examination of drawings, design documents or recordsin order to verify compliance with the rules or statutory requirements.

Prompt and thorough repair:A permanent repair completed at the time of survey to the satisfaction of thesurveyor, therein removing the need for the imposition of any associated condition of class.

Quality system: Signifies both the quality management system and established production and controlprocedures.

Quality Survey Plan (QSP):A plan that systematically identifies activities related to the classification project(e.g., Construction, installation, testing, mechanical completion, pre-commissioning, testing andcommissioning) and the extent of involvement each party (i.e., Yard's QC, Yards' QA, DNV and Owners [ifdesired]) will undertake. Such a plan needs to be submitted to the Society for approval prior to commencementof classification projects.

Reliability:The ability of a component or a system to perform its required function under given conditions for

a given time interval.Representative tanks:Those tanks which are expected to reflect the condition of other tanks of similar type andservice and with similar corrosion protection systems. When selecting representative tanks account shall betaken of the service and repair history on board and identifiable critical and/or suspect areas.

Review: Signifies a systematic examination of drawings, design documents or records in order to evaluate theirability to meet requirements, to identify any problems and to pro-pose necessary actions.

Safety systems: Systems needed to be continuous available or available on demand to prevent, to detect, tocontrol or to mitigate the effects of an undesirable event, and to safeguard the personnel, environment and theinstallation.

Sighting survey: A survey to confirm that the relevant construction or the equipment is in a satisfactorycondition and, as far as can be judged, will remain so until the postponed survey has been carried out.

Significant repair:A repair where machinery is completely dismantled and re-assembled. Significant repairswill, furthermore, be cases of repairs after serious damage to machinery.

The Society:Signifies Det Norske Veritas AS.

Safety systems:Systems, which are provided to prevent, detect, control or mitigate the effects of an accidentalevent. Failure of a safety system could lead to the development or escalation of an accidental event.

Spaces:Separate compartments including holds and tanks.

Statement of compliance:A document confirming compliance with specified requirements. Such documentsmay be issued by the Society in cases where it has not been authorised to certify compliance.

Statutory certificates:IMO convention certificates issued on behalf of, or by, national authorities.

Statutory survey:Survey carried out by or on behalf of a flag administration.

Substantial corrosion: Extent of corrosion such that assessment of corrosion pattern indicates wastage in

excess of 75% of allowable margins, but within acceptable limits.Survey:Signifies a systematic and independent examination of a vessel, materials, components or systems inorder to verify compliance with the rules and/or statutory requirements.Surveys will be carried out on the vessel, at the construction or repair site as well as at sub-suppliers and otherlocations at the discretion of the Society, which also decides the extent and method of control.





Suspect areas:Areas showing substantial corrosion and/or are considered by the surveyor to be prone to rapidwastage.

Temporary conditions: Design conditions not covered by operating conditions, e.g. conditions duringfabrication, mating and installation phases, dry transit phases.

Temporary equipment:equipment intended for use on installations and which is covered by class, requireshook-up to systems covered by class and/or is a significant deck load and/or may pose a risk for fire, explosion

and escape routes.Transit conditions:All wet vessel movements from one geographical location to another.

Transverse section:Section which includes all longitudinal members such as plating, longitudinals and girdersat the deck, side, bottom, inner bottom and hopper side plating, longitudinal bulkhead and bottom plating intop wing tanks, as applicable.

For transversely framed vessels, a transverse section includes adjacent frames and their end connections in wayof transverse sections.

UT:Ultrasonic Testing.

Verification:A service that signifies a confirmation through the provision of objective evidence (analysis,observation, measurement, test, records or other evidence) that specified requirements have been met.

Witnessing:Signifies attending tests or measurements where the surveyor verifies compliance with agreed testor measurement procedures.




Pt.0 Ch.2 Contents Page 10

CHAPTER 2 CONTENTS IN DETAIL

PART 0 INTRODUCTION ..................................................................................... 5

CHAPTER 1 INTRODUCTION ............................................................................................ 6

Sec.1 General................................................................................................................................ 6Sec.2 Objective............................................................................................................................. 6

Sec.3 Scope .................................................................................................................................. 6

Sec.4 Structure............................................................................................................................. 6

Sec.5 Definitions .......................................................................................................................... 6

5.1 Verbal forms ............................................................................................................................... 6

5.2 Definitions................................................................................................................................... 7

CHAPTER 2 CONTENTS IN DETAIL ............................................................................... 10

PART 1 GENERAL REGULATIONS AND CONDITIONS.................................. 18

CHAPTER 1 CLASSIFICATION PRINCIPLES ................................................................. 19

Sec.1 General.............................................................................................................................. 19

Sec.2 Application ....................................................................................................................... 19

Sec.3 Notations .......................................................................................................................... 19

CHAPTER 2 PROCEDURES ............................................................................................ 21

Sec.1 Plan Approval................................................................................................................... 21

1.1 Format ...................................................................................................................................... 21

1.2 Subcontractors ......................................................................................................................... 21

1.3 Plans and data to be submitted................................................................................................ 21Sec.2 Certification...................................................................................................................... 21

Sec.3 Testing and Surveys........................................................................................................ 21

CHAPTER 3 PRINCIPLES AND CONDITIONS ................................................................ 22

Sec.1 General.............................................................................................................................. 22

Sec.2 Principles.......................................................................................................................... 22

2.1 Classification scope.................................................................................................................. 22

2.2 Safety and important systems .................................................................................................. 22

2.3 Redundancy ............................................................................................................................. 23

2.4 Failure effects ........................................................................................................................... 23

Sec.3 Environmental Conditions .............................................................................................. 233.1 Design temperature.................................................................................................................. 23

3.2 Temperature for machinery systems and equipment ............................................................... 23

3.3 Cooling water temperatures ..................................................................................................... 24

3.4 Humidity.................................................................................................................................... 24

3.5 Performance ............................................................................................................................ 24

3.6 Inclinations................................................................................................................................ 24

3.7 Vibrations ................................................................................................................................. 24

PART 2 MATERIALS AND WELDING ............................................................... 25

CHAPTER 1 METALLIC MATERIALS ............................................................................. 26

Sec.1 General.............................................................................................................................. 26

Sec.2 Principles ......................................................................................................................... 26





CHAPTER 2 STRUCTURAL FABRICATION .................................................................... 27

Sec.1 General.............................................................................................................................. 27

PART 3 HULL AND EQUIPMENT ...................................................................... 28

CHAPTER 1 STRUCTURAL DESIGN .............................................................................. 29Sec.1 General.............................................................................................................................. 29

1.1 Introduction............................................................................................................................... 29

1.2 Plans and data to be submitted................................................................................................ 29

Sec.2 Principles.......................................................................................................................... 30

Sec.3 Analysis and Calculations .............................................................................................. 30

3.1 Fatigue analysis........................................................................................................................ 31

Sec.4 Design and Loading Conditions..................................................................................... 31

4.1 General ..................................................................................................................................... 31

4.2 Environmental conditions ........................................................................................................ 32

4.3 Accidental conditions ............................................................................................................... 32Sec.5 Loads and Load Effects .................................................................................................. 32

5.1 Accidental loads ....................................................................................................................... 33

5.2 Load calculations...................................................................................................................... 33

Sec.6 Structural Categorization, Material and Inspection Principles.................................... 33

6.1 Structural categorization........................................................................................................... 33

6.2 Material selection...................................................................................................................... 33

Sec.7 Structural Strength .......................................................................................................... 34

7.1 Footing strength........................................................................................................................ 34

7.2 Section scantlings..................................................................................................................... 35

7.3 Fatigue strength ....................................................................................................................... 35Sec.8 Weld Connections............................................................................................................ 35

Sec.9 Corrosion Control ............................................................................................................ 35

CHAPTER 2 STABILITY AND WATERTIGHT INTEGRITY .............................................. 36

Sec.1 General.............................................................................................................................. 36

1.1 Introduction............................................................................................................................... 36


Sec.2 Stability............................................................................................................................. 37

Sec.3 Watertight Integrity, Freeboard and Weathertight Closing Appliances...................... 37

3.1 Materials ................................................................................................................................... 37

3.2 Watertight integrity.................................................................................................................... 38

3.3 Weathertight closing appliances .............................................................................................. 38

3.4 Freeboard ................................................................................................................................. 38

3.5 Penetrations ............................................................................................................................. 39

CHAPTER 3 TOWING ....................................................................................................... 40

Sec.1 General.............................................................................................................................. 40

1.1 Introduction............................................................................................................................... 40


1.3 Principles.................................................................................................................................. 40

Sec.2 Towing .............................................................................................................................. 402.1 General ..................................................................................................................................... 40

2.2 Material ..................................................................................................................................... 40

2.3 Strength analysis ...................................................................................................................... 41





PART 4 MACHINERY SYSTEMS AND EQUIPMENT........................................ 42

CHAPTER 1 MARINE, MACHINERY AND PIPING SYSTEMS ........................................ 43

Sec.1 General.............................................................................................................................. 43

1.1 Introduction............................................................................................................................... 43

1.2 Application................................................................................................................................ 43


Sec.2 Principles.......................................................................................................................... 45

2.1 Component design ................................................................................................................... 45

Sec.3 Valves................................................................................................................................ 45

3.1 Design and tests....................................................................................................................... 45

3.2 Installation ................................................................................................................................ 45

3.3 Operation.................................................................................................................................. 45

Sec.4 Piping................................................................................................................................ 45

4.1 Design ...................................................................................................................................... 45

4.1.1 Materials....................................................................................................................... 46

4.2 Platform piping.......................................................................................................................... 464.2.1 Pre-load/ballast ............................................................................................................ 46

4.2.2 Bilge and drainage ....................................................................................................... 47

4.2.3 Raw water systems ...................................................................................................... 47

4.2.4 Drag chains .................................................................................................................. 47

4.2.5 Air, overflow and sounding ........................................................................................... 48

4.2.6 Storage and transfer systems for helicopter fuels........................................................ 48

4.3 Machinery piping ...................................................................................................................... 48

4.3.1 Cooling system............................................................................................................. 48

4.3.2 Lubrication oil system................................................................................................... 48

4.3.3 Fuel oil system ............................................................................................................. 48

4.3.4 Feed water and condensation systems........................................................................ 494.3.5 Hydraulic systems ........................................................................................................ 49

4.3.6 Pneumatic power supply .............................................................................................. 49

4.4 Pipe fabrication, workmanship and testing .............................................................................. 49

Sec.5 Rotating Machines........................................................................................................... 49

5.1 Principles.................................................................................................................................. 49

5.2 Diesel engines .......................................................................................................................... 49

5.3 Starting arrangements.............................................................................................................. 50

5.3.1 Capacity ....................................................................................................................... 50

5.3.2 Pneumatic .................................................................................................................... 50

5.3.3 Electric.......................................................................................................................... 50

5.3.4 Emergency generators ................................................................................................. 515.4 Start from dead ship............................................................................................................... 51

Sec.6 Jacking Gear Machinery.................................................................................................. 51

6.1 General ..................................................................................................................................... 51

6.1.1 Application.................................................................................................................... 51

6.1.2 Document and plans to be submitted........................................................................... 51

6.2 General .................................................................................................................................... 51

6.3 Materials ................................................................................................................................... 52

6.4 Arrangement............................................................................................................................. 52

6.5 Gearing..................................................................................................................................... 52

6.5.1 General......................................................................................................................... 52

6.5.2 Pinion rack.................................................................................................................... 53

6.5.3 Gear casings and bearing structure ............................................................................. 53

6.5.4 Shafts and connections ................................................................................................ 53

6.5.5 Bearings ....................................................................................................................... 53





6.6 Brakes ...................................................................................................................................... 53

6.7 Flexible mountings.................................................................................................................... 53

6.8 Control and monitoring ............................................................................................................. 53

6.9 Testing & inspection ................................................................................................................. 54

6.9.1 General......................................................................................................................... 54

6.9.2 Workshop testing.......................................................................................................... 54

6.9.3 Installation inspection ................................................................................................... 546.9.4 Testing on board .......................................................................................................... 54

CHAPTER 2 ELECTRICAL INSTALLATIONS .................................................................. 55

Sec.1 General.............................................................................................................................. 55

1.1 Introduction............................................................................................................................... 55

1.2 Application................................................................................................................................ 55


Sec.2 Principles.......................................................................................................................... 56

Sec.3 Arrangements and Installation ....................................................................................... 57

3.1 Arrangement............................................................................................................................. 57

3.2 Installation ................................................................................................................................ 57

Sec.4 Power Supply ................................................................................................................... 57

4.1 Main.......................................................................................................................................... 57

4.1.1 Capacity ....................................................................................................................... 57

4.1.2 Generator prime movers .............................................................................................. 58

4.1.3 System functionality ..................................................................................................... 58

4.1.4 Load shedding and automatic restoration of power ..................................................... 58

4.2 Emergency power supply systems .......................................................................................... 58

4.3 Battery systems ........................................................................................................................ 59

4.4 Power supply to jacking gear.................................................................................................... 59

Sec.5 Electrical Power Distribution.......................................................................................... 59

Sec.6 Protection ......................................................................................................................... 59

Sec.7 Control .............................................................................................................................. 60

Sec.8 Electrical Equipment: ...................................................................................................... 60

Sec.9 Cables ............................................................................................................................... 60

9.1 Cable selection ........................................................................................................................ 60

9.2 Cable construction and rating................................................................................................... 61

9.3 Cable routing and installations ................................................................................................. 61

CHAPTER 3 AREA ARRANGEMENTS ........................................................................... 63

Sec.1 General.............................................................................................................................. 63

1.1 Scope ....................................................................................................................................... 631.2 Plans and data to be submitted................................................................................................ 63

Sec.2 Arrangements................................................................................................................... 63

2.1 Electrical installations ............................................................................................................... 64

Sec.3 Hazardous Areas Installations........................................................................................ 64

3.1 Area classification..................................................................................................................... 64

3.2 Battery rooms, paint stores, and welding gas bottle stores ..................................................... 64

3.3 Requirements for specific systems........................................................................................... 65

3.3.1 Combustion engines..................................................................................................... 65

3.3.2 Electrical installations and cables................................................................................. 65

Sec.4 Ventilation Systems......................................................................................................... 65

Sec.5 Marking and Signboards................................................................................................. 66

CHAPTER 4 CONTROL AND COMMUNICATION SYSTEMS ......................................... 68

Sec.1 General.............................................................................................................................. 68





1.1 Introduction............................................................................................................................... 68

1.2 Application................................................................................................................................ 68


Sec.2 Principles.......................................................................................................................... 68

2.1 Response to failures................................................................................................................. 68

2.1.1 Failure detection........................................................................................................... 68

2.1.2 Fail-safe functionality.................................................................................................... 69

Sec.3 System Design ................................................................................................................. 69

3.1 Additional requirements for computer based systems.............................................................. 69

Sec.4 Component Design and Installation............................................................................... 69

Sec.5 User Interface................................................................................................................... 69

Sec.6 Emergency Control.......................................................................................................... 70

6.1 Emergency shut down.............................................................................................................. 70

6.1.1 Additional requirements for notation ES....................................................................... 70

6.2 Emergency control.................................................................................................................... 71


6.2.2 Emergency control room .............................................................................................. 71Sec.7 Communication & Alarms............................................................................................... 71

7.1 Communication......................................................................................................................... 71

7.2 Alarms...................................................................................................................................... 71


CHAPTER 5 FIRE PROTECTION ..................................................................................... 73

Sec.1 General.............................................................................................................................. 73

1.1 Introduction............................................................................................................................... 73

1.2 Application................................................................................................................................ 73


Sec.2 Principles.......................................................................................................................... 74Sec.3 Passive Fire Protection ................................................................................................... 74

3.1 Additional requirements for notation ES ................................................................................... 74

Sec.4 Fire Fighting Systems ..................................................................................................... 74

4.1 Fire pumps, fire mains, hydrants and hoses............................................................................. 74

4.2 Active fire protection of specific areas ...................................................................................... 75


Sec.5 Fire and Gas Detection Systems.................................................................................... 75

5.1 Additional requirements for notation ES ................................................................................... 75

Sec.6 Escape .............................................................................................................................. 76

CHAPTER 6 ENHANCED CONTROL & SAFETY SYSTEMS .......................................... 77

Sec.1 Introduction...................................................................................................................... 77

1.1 General ..................................................................................................................................... 77

1.2 Objective................................................................................................................................... 77

1.3 Scope ....................................................................................................................................... 77

1.4 Documentation requirements ................................................................................................... 77

Sec.2 Control Systems .............................................................................................................. 77

2.1 Emergency shutdown ............................................................................................................... 77

2.2 Emergency control.................................................................................................................... 78

2.3 Communication......................................................................................................................... 78

Sec.3 Fire Protection.................................................................................................................. 783.1 Passive fire protection .............................................................................................................. 78

3.2 Active fire protection of specific areas ...................................................................................... 78

3.3 Fire detectors............................................................................................................................ 79





PART 5 CERTIFICATION ................................................................................... 80

CHAPTER 1 PROCEDURES ............................................................................................ 81


Sec.2 Certification Types........................................................................................................... 81

Sec.3 Class Involvement ........................................................................................................... 81

CHAPTER 2 MACHINERY AND SYSTEM CERTIFICATION ........................................... 82

Sec.1 General.............................................................................................................................. 82

Sec.2 Principles.......................................................................................................................... 82

Sec.3 Machinery Systems and Equipment .............................................................................. 82

3.1 Miscellaneous mechanical components ................................................................................... 83

3.2 Pressure vessels ..................................................................................................................... 84

3.3 Main power, emergency power, fire water pumps ................................................................... 84

3.4 Components in marine piping systems..................................................................................... 85

Sec.4 Electrical Installations..................................................................................................... 85

4.1 Required certificates................................................................................................................. 85

Sec.5 Automation and Control System.................................................................................... 88

5.1 General ..................................................................................................................................... 88

Sec.6 Fire Protection.................................................................................................................. 88

Sec.7 Watertight/ Weathertight Integrity .................................................................................. 89

PART 6 NEWBUILDING SURVEY ..................................................................... 90

CHAPTER 1 INTRODUCTION .......................................................................................... 91

Sec.1 Overview .......................................................................................................................... 91

Sec.2 Structure........................................................................................................................... 91

Sec.3 Principles.......................................................................................................................... 91

CHAPTER 2 SURVEY PLANNING ................................................................................... 92

Sec.1 Objective........................................................................................................................... 92

Sec.2 Scope ................................................................................................................................ 92

Sec.3 Quality Survey Plan ......................................................................................................... 92

3.1 Review of the construction facility ............................................................................................ 92

3.2 Kick-off meeting........................................................................................................................ 92

3.2.1 Quality standards ......................................................................................................... 93

3.3 Survey extent............................................................................................................................ 93

CHAPTER 3 FABRICATION OF STRUCTURES .............................................................. 94

Sec.1 Principles.......................................................................................................................... 94

Sec.2 Technical Provisions....................................................................................................... 94

Sec.3 Certification and Classification...................................................................................... 94

CHAPTER 4 COMMISSIONING PROCESS ..................................................................... 95


Sec.2 Principles.......................................................................................................................... 95

Sec.3 Process............................................................................................................................. 95

Sec.4 Survey Scope Categories................................................................................................ 95Sec.5 Test Requirements related to Marine, Utility and Safety Systems.............................. 95

Sec.6 Jacking Trials................................................................................................................... 96

6.1 Jacking machinery.................................................................................................................... 96





CHAPTER 5 DELIVERABLES .......................................................................................... 97

Sec.1 Class Certificate............................................................................................................... 97

Sec.2 Conditions of Class ......................................................................................................... 97

Sec.3 Appendix to Class Certificate......................................................................................... 97

Sec.4 Additional Declarations................................................................................................... 97

Sec.5 Statutory Certificates....................................................................................................... 97

PART 7 CLASSIFICATION IN OPERATION...................................................... 98

CHAPTER 1 INTRODUCTION .......................................................................................... 99


Sec.2 Objective........................................................................................................................... 99

Sec.3 Scope ................................................................................................................................ 99

CHAPTER 2 GENERAL PROVISIONS AND REQUIREMENTS FOR SURVEYS ......... 100

Sec.1 Conditions for Retention of Class................................................................................ 100

Sec.2 Class Involvement ......................................................................................................... 100

2.1 Damage and repairs ............................................................................................................... 100

2.2 Temporary equipment ............................................................................................................ 100

Sec.3 Special Provisions for Ageing Units............................................................................ 101

3.1 Calculation of fatigue life ........................................................................................................ 101

3.2 Follow up ................................................................................................................................ 101

3.3 Additional inspections............................................................................................................. 102

Sec.4 Alternative Survey Arrangements ................................................................................ 102

Sec.5 Surveys Performed by Approved Companies............................................................. 102

CHAPTER 3 PREPARATION AND PLANNING ............................................................. 104Sec.1 Preparation..................................................................................................................... 104

Sec.2 Planning.......................................................................................................................... 104

2.1 General ................................................................................................................................... 104

2.2 Periodical surveys .................................................................................................................. 104

2.3 Specific surveys...................................................................................................................... 105

2.4 In-service Inspection Program (IIP) ........................................................................................ 105

CHAPTER 4 PERIODICAL SURVEYS ........................................................................... 107

Sec.1 Annual Survey................................................................................................................ 107

1.1 Structure and equipment ........................................................................................................ 107

1.1.1 Hull ............................................................................................................................. 1071.1.2 Watertight/ weathertight integrity................................................................................ 107

1.1.3 Towing system ........................................................................................................... 107

1.1.4 Machinery and safety systems ................................................................................... 107

1.1.5 Jacking system........................................................................................................... 107

1.1.6 Hazardous area.......................................................................................................... 108

1.1.7 Drainage, bilge, pre load ........................................................................................ 108

1.1.8 General....................................................................................................................... 108

Sec.2 Intermediate Survey....................................................................................................... 108


2.1.1 Legs............................................................................................................................ 108

2.2 Machinery and systems.......................................................................................................... 1082.2.1 Fire protection/ extinguishing/ prevention................................................................... 108

Sec.3 Renewal Survey ............................................................................................................. 108

3.1 Extent ..................................................................................................................................... 108






3.2.1 Legs............................................................................................................................ 108

3.2.2 Acceptance criteria corrosion limits............................................................................ 109

3.2.3 Tanks ......................................................................................................................... 109

3.3 Weight/ displacement survey.................................................................................................. 110

3.3.1 Towing equipment ..................................................................................................... 110

3.4 Machinery and systems.......................................................................................................... 1103.4.1 General....................................................................................................................... 110

3.4.2 Jacking system........................................................................................................... 111

3.4.3 Raw water pumps....................................................................................................... 111

3.4.4 Hazardous area.......................................................................................................... 111

3.4.5 Fire protection/ extinguishing/ prevention................................................................... 111

3.4.6 Instrumentation and automation................................................................................. 112

3.5 General ................................................................................................................................... 112

CHAPTER 5 OTHER SURVEYS ..................................................................................... 113

Sec.1 Record Keeping ............................................................................................................ 113

Sec.2 Bottom Survey ............................................................................................................... 113Sec.3 Spudcan & Leg Survey.................................................................................................. 113

3.1 General ................................................................................................................................... 113

3.2 Scope ..................................................................................................................................... 113

3.3 Inspection ............................................................................................................................... 113

Sec.4 Survey after Ocean Transit ........................................................................................... 113

CHAPTER 6 PERMANENTLY INSTALLED SELF-ELEVATING UNITS ......................... 115

Sec.1 Introduction.................................................................................................................... 115

Sec.2 Fatigue ............................................................................................................................ 115

Sec.3 Inspection and Maintenance......................................................................................... 115

3.1 Facilities for survey................................................................................................................. 115Sec.4 Jacking System.............................................................................................................. 115


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DETNORSKEVERITASAS


Page 18

PART 1 GENERAL REGULATIONS ANDCONDITIONS





CHAPTER 1 CLASSIFICATION PRINCIPLES

Section 1. General

General regulations and procedures are described in DNV Offshore Service Specifications-101, Chapter 1.

Specific requirements and relevant instructions for classing conventional self-elevating units are contained inthis Rule chapter.

Deviation from the requirements may be substituted where shown to provide and equivalent or higher level ofintegrity or safety. Any deviation from the requirements shall be documented and agreed between allcontracting parties.

The table below lists references required for a complete understanding of this chapter.

Section 2. Application

These rules are intended for Self-elevating units of conventional design, that is:

Separated legs Not designed for field- or ocean transits under own power Diesel driven generators Rack and pinion type jacking system

For other types of offshore units and self-elevating units with design alternatives or technical solutions notcovered in these rules is referred to DNV-OSS-101.

Unless stated otherwise, the coming into force date for these rules and the documents referenced by this OSSas technical basis for classification shall be six (6) months after the date of publication.

Section 3. NotationsVessels build under compliance of the requirements and procedures of these rules shall be given the classnotation +1A1 Self-elevating Drilling Unit NON-SELF-PROPELLED.

Table 3-1 lists most relevant additional class notation for non-self-propelled, Self-elevating units. A completelist of additional Class notations can be found in OSS-101, Ch.1, Sec.3, B600 and in Rules for Classificationof Ships Pt.1 Ch.2.

Table 1-1 Overview of references

Reference Title

DNV-OSS-101 Rules for Classification of Offshore Drilling and Support Units

Table 3-1

Class notation Description Qualifier Description Design requirements

CRANE Onboard craneRules for Classification ofShips, Pt.6 Ch.1 Sec.3

DRILL Drilling plant DNV-OS-E101

E0 Periodically unattendedmachinery space

Rules for Classification ofShips, Pt.6 Ch.3

ECOMachinery centralizedoperated


ES Enhanced systemsCover fire, communication andcontrol systems

As marked inside these rules

HELDK Helicopter deck

Structure

DNV-OS-E401, Ch.2S Vessel safety

H Helicopter safety

ISDSIntegrated SoftwareDependent Systems

(...)See DNV-OS D203 forqualifier definitions

DNV-OS D203




Pt.1 Ch.1 Sec.3. Notations Page 20

RecyclableInventory of HazardousMaterials Part 1


WELL Well intervention system1

Vessel mounted systemexcluding subsea equipment.

DNV-OS-E101

2 Vessel mounted systemincluding subsea equipment.

WELLTEST Well test system DNV-OS-E101, Ch.3

Table 3-1 (Continued)

Class notation Description Qualifier Description Design requirements




Pt.1 Ch.2 Sec.1. Plan Approval Page 21

CHAPTER 2 PROCEDURES

Section 1. Plan Approval

1.1 Format

The documentation for plan approval may be submitted on paper or as an electronic file. Any documentssubmitted for re-approval or re-examination shall be especially marked to identify the revised parts. Symbolsused shall be explained, or reference to a standard code shall be given. Each drawing shall include a title fieldstating:

name of vessel (when known) name of document issuing company name and signature of originator and verifier document no. document title revision no. issue date scale set of measurement units used in the document, e.g. System International.

The document title should not include the name of the vessel. The document title should include the functionor component covered by the document.

Unique revision numbers shall be allocated to all issues of a document, including the first issue. For documentswith multiple sheets, the revision number should be the same for all sheets.

1.2 Subcontractors

Where subcontractors and suppliers are involved, the customer shall co-ordinate the submission of requiredplans and documents, as well as co-ordinate any approval comments given by the Society. This does not applyfor materials, components and systems requiring certification as is discussed in more detail in Part 5.

1.3 Plans and data to be submitted

General list of plans and data to be submitted are included in the applicable technical chapters of Parts 2 to 4.

A detailed and project specific list shall be supplied by the DNV responsible directly after the class agreementhas been signed. Project specific implies that only those documentation is required as is relevant for the designand within the scope of the contractual agreement between yard and DNV.

Section 2. Certification

The scope of classification requires that specified materials, components and systems intended for the vesselare certified according to the rules. The objective of certification shall ensure that materials, components andsystems used in vessels to be classed by the Society comply with the rule requirements.

Certification normally includes both plan approval and survey during production and/or of the final product.

A detailed description of the certification process and the specific requirements and lists of the specifiedmaterials, components and systems is given in Part 5.

Section 3. Testing and Surveys

During the building period DNV carries out surveys at the building yard and its suppliers. The purpose of theseis to verify that the construction, components and equipment satisfy the rule requirements and are in accordancewith the approved plans, that required materials are used, and that functional tests are carried out as prescribed

by the rules. A complete description of these test and surveys is given in Part 6.





CHAPTER 3 PRINCIPLES AND CONDITIONS

Section 1. General

The table below lists references required for a complete understanding of this chapter.

Section 2. Principles

2.1 Classification scope

These rules with the referred standards give requirements in the following areas:

1) Hull and main structure

strength materials and welding corrosion protection passive fire protection weathertight and watertight integrity stability and floatability.

2) Marine and machinery installations and equipmentMachinery installations and equipment, including their related auxiliary systems, to the following mainfunctions:

jacking gear fire extinguishing

drainage and bilge pumping ballasting emergency shutdown systems.

3) Systems and equipment provided to prevent, detect/ warn of an accidental event and/or prevent or mitigateits effects

4) Secure integrity of shelter areas and usability of escape ways and means of evacuation

2.2 Safety and important systems

To further frame the content of the rules, the above listed areas and systems are split into safety (or essential)and important systems.

Safety systems are systems needed to be continuous available or available on demand to prevent, to detect, tocontrol or to mitigate the effects of an undesirable event, and to safeguard the personnel, environment and theinstallation. Examples of safety systems covered by main class:

fire pumps emergency shut down (ESD) system fire and gas detection and alarm system systems required to be supplied from batteries or emergency generator, e.g. public address, emergency

lighting electric generators and associated power sources supplying the above equipment. control, monitoring and safety devices or systems for safety systems.

Important services ensure reliable operation and maintain the units operation within operational limitations.Examples of equipment or systems for important services covered by main class:

fuel oil transfer pumps and fuel oil treatment equipment

seawater pumps (note) starting air and control air compressors bilge- and ballast/preload pumps ventilating fans for engine rooms ventilating fans for gas dangerous spaces

Table 1-1 Overview of referencesReference Title

DNV-OS-D101 Marine and Machinery Systems and Equipment

DNV-OS-D201 Electrical Installations

DNV-OS-D202 Automation, Safety, and Telecommunication Systems




Pt.1 Ch.3 Sec.3. Environmental Conditions Page 23

main lighting system watertight closing appliances jacking system bilge alarm system electric generators and associated power sources supplying the above equipment. control, monitoring and safety devices or systems for the above equipment Seawater pumps (if used as part of a fire water supply system).

2.3 Redundancy

Safety systems are always to be available. To secure that safety systems always are available, the generalprinciple is that components and systems shall be arranged with redundancy so that a single failure of any activecomponent or system does not cause loss of any main function. Availability is as such, further indirect definedin the requirement to a system i.e where this general principle may be waived and/ or where duplication ofcomponents is required.

Redundancy can either be arranged by installing more than one unit (component redundancy) or by having twoor more systems capable of performing the same functions (system redundancy).

For redundancy on a component level a single failure of an active component shall not lead to a reduction ofthe output power for the main function served.

When two or more components are performing the same function, these shall be mutually independent and at

least one shall be independently driven. Components arranged as part of the designed redundancy, yet onlyperforming important functions to a main unit, can be directly powered by the main unit through separate powertransmissions, on the condition that these components are not necessary for the starting of the main unit.

When traditional mechanical components are replaced by electronic components, these components shall havethe same reliability as the mechanical component being replaced.

Machinery or equipment having remote or automatic control, shall have additional alternative provisions forattendance and operation.

2.4 Failure effects

In the event of failure, components and systems shall enter the least hazardous of the possible failure states withregard to machinery, personnel and environment.

Failure of one component in a system arranged as part of the designed redundancy shall not lead to failure or

damage to backup or parallel components or systems.For failure detection see Pt.4, Ch.4, Sec.2.1.

Section 3. Environmental Conditions

All components and systems covered by this standard shall be designed to operate under the followingenvironmental conditions unless otherwise specified in the detailed requirements for the component or system.

3.1 Design temperature

The units design temperature is a minimum temperature used as a criterion for the selection of steel grades.The design temperature shall be specified by the customer and is to be taken as the lower or equal to the lowestmean daily temperature in air for the relevant areas. For seasonal restricted operations the lowest mean daily

temperature in air for the season may be applied.Guidance note:

It is underlined that design temperatures below 0 degrees are only relevant for waters in the higher latitudes (e.g.northern part of North Sea, Canadian waters etc). For these waters and their harsh conditions, relevant considerationsshould be taken (e.g. OS-C201, Sec.2 B304 on water trapped in local structures, OS-D101, Ch.2 Sec.3 F108 onfreezing of vents, OS-D301 in protecting the fire equipment against freezing etc) In addition, class notations relatedto cold climate operations as listed in OSS-101, Ch.1 Sec.3, B 700 can be relevant as well.

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

The design temperature shall be listed in the appendix to Class Certificate (see also Pt.6, Ch.5, Sec.3).

Guidance note:

In the different offshore standards is in addition to a design temperature a service temperature defined. For self-elevating units, the two temperatures are equal.

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

3.2 Temperature for machinery systems and equipment

Machinery systems and equipment shall be constructed for continuous operation in the range of ambient




Pt.1 Ch.3 Sec.3. Environmental Conditions Page 24

temperatures as specified in the table below.

For the different environmental classes and the specified temperature ranges as applicable for control- andcommunication equipment see DNV-OS-D202, Ch.2, Sec.4 B.

3.3 Cooling water temperatures

Electrical equipment shall be constructed for continuous operation under full rated load, at

DNV-OSS-104 - Rules for Classification of Self-Elevating Units 2012

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