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

OFFSHORE SERVICE SPECIFICATION

DET NORSKE VERITAS AS

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DNV-OSS-101

Rules for Classification of Offshore Drilling and Support Units

OCTOBER 2013

Det Norske Veritas AS October 2013

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.

FOREWORD

DNV is a global provider of knowledge for managing risk. Today, safe and responsible business conduct is both a licenseto operate and a competitive advantage. Our core competence is to identify, assess, and advise on risk management. Fromour leading position in certification, classification, verification, and training, we develop and apply standards and bestpractices. This helps our customers safely and responsibly improve their business performance. DNV is an independentorganisation with dedicated risk professionals in more than 100 countries, with the purpose of safeguarding life, propertyand the environment.

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 Energy

O) Subsea Systems

U) Unconventional Oil & Gas


Offshore Service Specification DNV-OSS-101, October 2013

CHANGES CURRENT Page 3

CHANGES CURRENT

General

This document supersedes DNV-OSS-101, October 2012.

Text affected by the main changes in this edition is highlighted in red colour. However, if the changes involvea whole chapter, section or sub-section, normally only the title will be in red colour.

Main changes October 2013, entering into force 1 April 2014

General

Specific for this edition

Significant changes have been highlighted throughout the document. For clarity, the following changes havenot been highlighted:

content based on existing requirements from reference documents interpretations based on old rule requirements editorial restructuring and moves.

The structure of this document has been converted to decimal numbering. Older references to thisdocument may normally be interpreted by analogy to this example:

DNV-OSS-101 Ch.2 Sec.3 D506 is now DNV-OSS-101 Ch.2 Sec.3 [4.5.6].

The content has been balanced by describing survey requirements applicable for all units, followed byvessel type specific requirements for all periodical surveys and applicable areas (typically with regard tohull and equipment).

Periodical survey requirements have been aligned with the Rules for Classification of Ships (Rules forShips).

Gas turbine inspection requirements have been covered. The position/ use of DNV-OSS-101 with regard to DNV-OSS-104 has been clarified. Service unit survey requirements have been clarified and focused, among others by including specific sub-

section on scope. A new App.B on mooring equipment acceptance standard guidance, originally placed inside the main text,

has been included. More extensive descriptions with regard to our follow up on ageing units have been included. Descriptions for alternative survey arrangements have been updated.

Ch.1 General

Definition of EU Mutual Recognition Type Approval Certificate has been included.

Ch.1 Sec.3 Classification scope and notations

The overview of class notations in [2] has been updated.

Ch.2 General

Scope of classification with regard to structural design has been clarified in Sec.2 [3] and Sec.1 [4].

Ch.3 General

The text has been restructured by:

1) Restructuring content of Sec.2 and previous Sec.4 A.

2) Deleting previous Sec.3 on alternative survey arrangements and service suppliers and moving thecontent to respectively Sec.7 and Sec.8.

3) Separating Miscellaneous main class surveys from Sec.3.

Ch.3 Sec.1 General provisions

Updated overview table of periodical surveys.

Ch.3 Sec.2 General requirements for structure and machinery surveys

Aligned with relevant description of Rules for Ships. Reference to RP for bonded patch repairs.



CHANGES CURRENT Page 4

Ch.3 Sec.3 (previous Sec.4) Periodical survey extent for main class

[1] General:

Updated IIP scope table.

[2] Annual survey main class:

Content has been rewritten based on applicable Rules for Ships and IACS. The text has been restructured as described above.

[3] Intermediate survey:

Content has been rewritten based on applicable Rules for Ships and IACS. The text has been restructured as described above. Specific requirements for units > 10 years have been added.

[4] Renewal survey, structure and equipment:

Content has been rewritten based on applicable Rules for Ships and IACS. The text has been restructured as described above. Thickness measurement tables for different vessel types have been included. Special, primary and secondary areas for inspection for different vessel types have been listed. Tail shaft sealing inspection for non-self-propelled units has been included.

[5] Renewal survey, machinery and safety systems:

Content has been rewritten based on applicable Rules for Ships and IACS. The text has been restructured as described above.

Ch.3 Sec.4 Miscellaneous main class surveys

The text has been cleaned up by to a larger degree referring to relevant Rules for Ships.

Ch.3 Sec.5 Periodical survey extent for additional service notations

Specific survey requirements for the different service notations have been updated. Scope for each service notation has been clarified. Wind Turbine Installation units and Offshore Support units have been included.

Ch.3 Sec.6 Optional class notation surveys

Several requirements related to the DRILL notation have been updated. DEICE has been removed. WINTERIZATION and ISDS requirements have been included. BWM references have been completed Several notations have been updated by in a large degree referring to the Rules for Ships.

Ch.3 Sec.7 Alternative survey arrangements

Alternative survey requirements for drilling equipment have been described.

Ch.3 Sec.8 Surveys performed by approved companies

This new section contains existing requirements on service suppliers previously found in Sec.3.

In addition to the above stated main changes, editorial corrections may have been made.

Editorial Corrections



Contents Page 5

CONTENTS

CHANGES CURRENT ................................................................................................................... 3

CH. 1 PRINCIPLES AND PROCEDURES FOR CLASSIFICATION............ 14

Sec. 1 Introduction....................................................................................................................... 14

1 Introduction ............................................................................................................................................. 14

1.1 General ........................................................................................................................................... 141.2 Organisation of DNV-OSS-101..................................................................................................... 141.3 Objects covered.............................................................................................................................. 14

2 Definitions ................................................................................................................................................ 14

2.1 Verbal forms .................................................................................................................................. 142.2 Definitions...................................................................................................................................... 14

3 Normative references .............................................................................................................................. 18

3.1 Normative references ..................................................................................................................... 183.2 DNV reference documents............................................................................................................. 183.3 Other references ............................................................................................................................. 19

4 Informative references............................................................................................................................ 19

4.1 DNV informative references.......................................................................................................... 194.2 Other references ............................................................................................................................. 19

5 Abbreviations........................................................................................................................................... 20

5.1 General ........................................................................................................................................... 20

Sec. 2 Classification principles ................................................................................................... 21

1 The classification concept ....................................................................................................................... 21

1.1 Introduction.................................................................................................................................... 211.2 Applicable rules ............................................................................................................................. 211.3 Basis for assignment of class ......................................................................................................... 221.4 Basis for maintenance of class....................................................................................................... 221.5 Documentation............................................................................................................................... 221.6 Disclosure of information .............................................................................................................. 231.7 Access ............................................................................................................................................ 241.8 Calibration of equipment ............................................................................................................... 241.9 Service suppliers ............................................................................................................................ 241.10 Limitation of DNV's responsibility................................................................................................ 24

2 Appeals ..................................................................................................................................................... 24

2.1 Decisions taken by the society ...................................................................................................... 24

3 Statutory certification ............................................................................................................................. 25

3.1 General .......................................................................................................................................... 253.2 Service suppliers ............................................................................................................................ 25

Sec. 3 Classification scope and notations................................................................................... 26

1 Scope of classification.............................................................................................................................. 26

1.1 General ........................................................................................................................................... 261.2 Rule parts ....................................................................................................................................... 261.3 Rule particulars .............................................................................................................................. 26

2 Class notations ......................................................................................................................................... 26

2.1 General ........................................................................................................................................... 262.2 Construction symbols..................................................................................................................... 262.3 Main character of class .................................................................................................................. 272.4 Basic design notations.................................................................................................................... 272.5 Service notations............................................................................................................................ 272.6 Optional class notations related to special equipment and systems............................................... 272.7 Optional class notations related to cold climate operation ............................................................ 282.8 Special feature notations ................................................................................................................ 282.9 Service restrictions......................................................................................................................... 292.10 Compliance with coastal state legislation ...................................................................................... 292.11 Combination of notations............................................................................................................... 29

Sec. 4 Assignment of class ........................................................................................................... 30

1 Assignment of class - new vessels ........................................................................................................... 30

1.1 General ........................................................................................................................................... 301.2 Requirements for builder or designer ............................................................................................ 30



Contents Page 6

1.3 Applicable rules ............................................................................................................................. 301.4 Plan approval ................................................................................................................................. 311.5 Survey during construction ............................................................................................................ 321.6 Installation of systems and equipment........................................................................................... 321.7 Testing and commissioning ........................................................................................................... 32

2 Assignment of class - existing vessels..................................................................................................... 33

2.1 General ........................................................................................................................................... 332.2 Applicable rules ............................................................................................................................. 332.3 Design approval ............................................................................................................................. 332.4 Class entry survey .......................................................................................................................... 33

3 The class certificate ................................................................................................................................. 33

3.1 General ........................................................................................................................................... 333.2 Late commissioning ....................................................................................................................... 34

4 The register of vessels ............................................................................................................................. 34

4.1 General ........................................................................................................................................... 34

Sec. 5 Retention of class .............................................................................................................. 35

1 Conditions for retention of class ............................................................................................................ 35

1.1 General requirements ..................................................................................................................... 351.2 The customers obligations ............................................................................................................ 351.3 Maintenance................................................................................................................................... 35

2 Classification society involvement ......................................................................................................... 36

2.1 Applicable rules ............................................................................................................................. 362.2 Surveys........................................................................................................................................... 362.3 Conditions and memoranda ........................................................................................................... 362.4 Survey reports and survey status.................................................................................................... 372.5 Damage and repairs........................................................................................................................ 372.6 Conversions and alterations ........................................................................................................... 382.7 Temporary equipment.................................................................................................................... 38

3 Endorsement and renewal of the class certificate ................................................................................ 38

3.1 Endorsement of the class certificate .............................................................................................. 383.2 Renewal of the class certificate...................................................................................................... 39

4 Suspension and withdrawal of class ...................................................................................................... 39

4.1 General ........................................................................................................................................... 394.2 Suspension of class ........................................................................................................................ 404.3 Reinstatement following class suspension..................................................................................... 404.4 Withdrawal of class........................................................................................................................ 404.5 Re-assignment of class following class withdrawal ...................................................................... 41

5 Change of owner or manager................................................................................................................. 41

5.1 General ........................................................................................................................................... 41

6 Force majeure.......................................................................................................................................... 41

6.1 General ........................................................................................................................................... 41

Sec. 6 Certification of materials, components and systems ..................................................... 42

1 General ..................................................................................................................................................... 42

1.1 General ........................................................................................................................................... 421.2 Requirements for manufacturer ..................................................................................................... 42

2 The Classification involvement .............................................................................................................. 42

2.1 General ........................................................................................................................................... 422.2 Plan approval ................................................................................................................................. 432.3 Type approval ................................................................................................................................ 432.4 Survey ............................................................................................................................................ 442.5 Manufacturing survey arrangement ............................................................................................... 44

3 Suspension and withdrawal of certificates............................................................................................ 44

3.1 General ........................................................................................................................................... 44

Sec. 7 Legal provisions ................................................................................................................ 45

1 Liability and jurisdiction ........................................................................................................................ 45

1.1 Limited liability ............................................................................................................................. 451.2 Use by other parties ....................................................................................................................... 451.3 Governing law................................................................................................................................ 451.4 Venue ............................................................................................................................................. 45



Contents Page 7

CH. 2 DESIGN AND CONSTRUCTION PROVISIONS................................... 46

Sec. 1 Design and construction requirements for 1A1 MOU main class................................ 46

1 General ..................................................................................................................................................... 46

1.1 Introduction.................................................................................................................................... 461.2 Technical reference documents...................................................................................................... 461.3 General assumptions ...................................................................................................................... 46

2 Safety principles and arrangement........................................................................................................ 47

2.1 General ........................................................................................................................................... 472.2 Design principles ........................................................................................................................... 472.3 Arrangement .................................................................................................................................. 472.4 Escape and evacuation ................................................................................................................... 47

3 Materials .................................................................................................................................................. 47

3.1 Technical requirements.................................................................................................................. 473.2 Supplementary classification requirements ................................................................................... 47

4 Structural design ..................................................................................................................................... 47

4.1 Scope.............................................................................................................................................. 474.2 Technical requirements.................................................................................................................. 48

5 Fabrication and testing of offshore structures ..................................................................................... 48


6 Stability and watertight/weathertight integrity.................................................................................... 48

6.1 Technical requirements.................................................................................................................. 48

7 Mooring and towing ................................................................................................................................ 48

7.1 General ........................................................................................................................................... 487.2 Ship-shaped units ........................................................................................................................... 487.3 Column-stabilised units ................................................................................................................. 497.4 Self-elevating units ........................................................................................................................ 497.5 Towing ........................................................................................................................................... 497.6 Supplementary classification requirements ................................................................................... 49

8 Marine and machinery systems and equipment................................................................................... 49


9 Electrical systems and equipment.......................................................................................................... 49


10 Instrumentation and telecommunication systems................................................................................ 50


11 Fire protection ......................................................................................................................................... 50


12 Preparation for surveys and inspections on location ........................................................................... 50

12.1 General ........................................................................................................................................... 50

13 Summary of technical reference standards .......................................................................................... 51

13.1 General ........................................................................................................................................... 51

Sec. 2 Supplementary requirements for drilling units ............................................................. 53

1 General ..................................................................................................................................................... 53

1.1 Introduction.................................................................................................................................... 531.2 Scope.............................................................................................................................................. 53


2.1 General ........................................................................................................................................... 532.2 Arrangement ................................................................................................................................. 532.3 Area classification.......................................................................................................................... 532.4 Emergency shutdown..................................................................................................................... 532.5 Escape, evacuation and communication ........................................................................................ 53


3.1 General ........................................................................................................................................... 53

4 Fire protection ......................................................................................................................................... 54

4.1 General ........................................................................................................................................... 544.2 Supplementary technical requirements .......................................................................................... 54



Contents Page 8

5 Summary of requirements...................................................................................................................... 54

5.1 Technical reference standards........................................................................................................ 54

Sec. 3 Supplementary requirements for well intervention units ............................................. 55

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

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

2 Requirements for Well Intervention Unit 1 ....................................................................................... 55

2.1 General ........................................................................................................................................... 552.2 Supplementary requirements ......................................................................................................... 55

3 Requirements for Well Intervention Unit 2 ....................................................................................... 56

3.1 General ........................................................................................................................................... 563.2 Arrangement .................................................................................................................................. 563.3 Area classification.......................................................................................................................... 563.4 Emergency shutdown..................................................................................................................... 563.5 Escape, evacuation and communication ........................................................................................ 563.6 Fire Protection................................................................................................................................ 563.7 Supplementary classification requirements ................................................................................... 56


4.1 General ........................................................................................................................................... 57

5 Position keeping....................................................................................................................................... 57

5.1 General ........................................................................................................................................... 57

Sec. 4 Supplementary requirements for accommodation units............................................... 58

1 General ..................................................................................................................................................... 58

1.1 Introduction.................................................................................................................................... 58


2.1 Emergency shutdown..................................................................................................................... 58

3 Structural strength.................................................................................................................................. 58

3.1 General ........................................................................................................................................... 583.2 Design loads................................................................................................................................... 583.3 Containerised modules................................................................................................................... 583.4 Gangways....................................................................................................................................... 58

4 Stability and watertight integrity........................................................................................................... 59

4.1 General ........................................................................................................................................... 59

5 Electrical systems and equipment.......................................................................................................... 59

5.1 Emergency source of power and emergency installation .............................................................. 59

6 Position keeping....................................................................................................................................... 59

6.1 General ........................................................................................................................................... 59

Sec. 5 Supplementary requirements for crane units ................................................................ 60

1 Introduction ............................................................................................................................................. 60

1.1 Objective ........................................................................................................................................ 601.2 Safety principles and arrangements ............................................................................................... 60


2.1 General ........................................................................................................................................... 602.2 Technical requirements.................................................................................................................. 60

3 Stability and watertight integrity........................................................................................................... 60

3.1 Technical requirements.................................................................................................................. 60

4 Certification of materials and components........................................................................................... 60

4.1 Certification requirements ............................................................................................................. 60

Sec. 6 Supplementary requirements for wind turbine installation units................................ 61

1 General ..................................................................................................................................................... 61

1.1 Introduction.................................................................................................................................... 61

2 General requirements for Wind Turbine Installation Unit ............................................................. 61

2.1 Column stabilised or self-elevating units....................................................................................... 612.2 Non self-elevating vessel ............................................................................................................... 61

3 Crane installations................................................................................................................................... 61

3.1 General ........................................................................................................................................... 61

Sec. 7 Optional class notations.................................................................................................... 62

1 Introduction ............................................................................................................................................. 62



Contents Page 9

1.1 General ........................................................................................................................................... 621.2 Technical reference documents...................................................................................................... 621.3 General assumptions ...................................................................................................................... 62

2 Enhanced systems.................................................................................................................................... 62

2.1 General ........................................................................................................................................... 622.2 Technical requirements.................................................................................................................. 622.3 Certification of materials and components .................................................................................... 62

3 Position mooring system ......................................................................................................................... 63

3.1 General ........................................................................................................................................... 633.2 Application..................................................................................................................................... 633.3 Technical requirements.................................................................................................................. 633.4 Certification of materials and components .................................................................................... 63

4 Dynamic positioning systems.................................................................................................................. 64

4.1 General ........................................................................................................................................... 644.2 Technical requirements.................................................................................................................. 644.3 Certification of materials and components ................................................................................... 64

5 Drilling plant............................................................................................................................................ 65

5.1 General ........................................................................................................................................... 655.2 Technical requirements.................................................................................................................. 655.3 Certification of materials and components .................................................................................... 655.4 DRILL(US).................................................................................................................................... 65

6 Helicopter decks ...................................................................................................................................... 66


7 Well testing facilities ............................................................................................................................... 66


8 Temporary oil storage facilities ............................................................................................................. 67


9 Crane installations .................................................................................................................................. 68


10 Diving system installations .................................................................................................................... 68


11 Additional fire protection ...................................................................................................................... 69


12 Loading computer .................................................................................................................................. 70


13 Periodically unattended machinery space............................................................................................. 70


14 Well intervention system ........................................................................................................................ 71


15 Hull monitoring system........................................................................................................................... 72


16 Fatigue methodology for ship-shaped units .......................................................................................... 72




Contents Page 10

17 Noise, vibration and comfort rating notations...................................................................................... 72

17.1 General ........................................................................................................................................... 7217.2 Technical requirements.................................................................................................................. 7317.3 Certification requirements ............................................................................................................. 73

18 Cold climate notations ............................................................................................................................ 73

18.1 General ........................................................................................................................................... 7318.2 Structural strength ......................................................................................................................... 7318.3 Winterized...................................................................................................................................... 75

19 Environmental notations ........................................................................................................................ 75

19.1 General ........................................................................................................................................... 7519.2 Objective ........................................................................................................................................ 7519.3 Technical requirements.................................................................................................................. 76

20 Enhanced system verification................................................................................................................. 76


21 Integrated software dependent systems ................................................................................................ 77


22 Special feature notations......................................................................................................................... 78

22.1 General ........................................................................................................................................... 7822.2 Special feature notation NON-SELFPROPELLED.................................................................... 7822.3 Tailshaft monitoring TMON....................................................................................................... 7822.4 Special feature notation BIS ......................................................................................................... 79

23 Summary of reference documents for additional class notations ....................................................... 79

23.1 General ........................................................................................................................................... 79

CH. 3 CLASSIFICATION IN OPERATION ...................................................... 81

Sec. 1 General provisions ........................................................................................................... 81

1 Introduction ............................................................................................................................................. 81

1.1 General ........................................................................................................................................... 811.2 Survey pre-planning and record keeping ....................................................................................... 811.3 Alternative survey arrangements ................................................................................................... 811.4 Surveys performed by approved companies .................................................................................. 81

2 Periodical surveys.................................................................................................................................... 81

2.1 General ........................................................................................................................................... 812.2 Postponement of periodical surveys .............................................................................................. 822.3 Survey of units out of commission ................................................................................................ 822.4 Survey Schedules ........................................................................................................................... 82

Sec. 2 General requirements for structure and machinery surveys ....................................... 86

1 General ..................................................................................................................................................... 86

1.1 Preparation for survey.................................................................................................................... 86

2 Hull and equipment................................................................................................................................. 86

2.1 Conditions for survey and access to structures .............................................................................. 862.2 Survey extent ................................................................................................................................ 872.3 Repair of structural damage or deterioration ................................................................................. 88

3 Machinery and systems .......................................................................................................................... 89

3.1 Maintenance and preparation for survey........................................................................................ 893.2 Replacement of machinery components ........................................................................................ 893.3 Machinery verification................................................................................................................... 893.4 Gas turbines ................................................................................................................................... 903.5 Boiler installations ......................................................................................................................... 903.6 Survey of special components ....................................................................................................... 90

4 Special provisions for ageing offshore units ......................................................................................... 91

4.1 General ........................................................................................................................................... 914.2 Corrosion measurements and condition of protective coating ...................................................... 914.3 Fatigue utilization index (FUI) ...................................................................................................... 91

Sec. 3 Periodical survey extent for main class........................................................................... 93

1 General ..................................................................................................................................................... 93

1.1 Introduction.................................................................................................................................... 93



Contents Page 11

1.2 In-service inspection program (IIP) ............................................................................................... 93

2 Annual survey main class .................................................................................................................... 96

2.1 Survey extent ................................................................................................................................. 962.2 Structure and equipment, general ............................................................................................... 962.3 Structure and equipment, type specific.......................................................................................... 982.4 Machinery and safety systems ...................................................................................................... 98

3 Intermediate survey .............................................................................................................................. 100

3.1 General ......................................................................................................................................... 1003.2 Structure and equipment ............................................................................................................. 1003.3 Machinery and safety systems .................................................................................................... 101

4 Renewal survey, structure and equipment ......................................................................................... 101

4.1 General ......................................................................................................................................... 1014.2 All units ....................................................................................................................................... 1024.3 Specific requirements for ship-shaped units ................................................................................ 1054.4 Specific requirements for column stabilised units ....................................................................... 1064.5 Specific requirements for self-elevating units ............................................................................. 1084.6 Specific requirements for units of other shape ............................................................................ 110

5 Renewal survey, machinery and safety systems ................................................................................. 110

5.1 General ......................................................................................................................................... 1105.2 Machinery .................................................................................................................................... 1105.3 Electrical installations.................................................................................................................. 1115.4 Instrumentation and automation .................................................................................................. 112

Sec. 4 Miscellaneous main class surveys.................................................................................. 113

1 Propeller shaft survey .......................................................................................................................... 113

1.1 General ......................................................................................................................................... 113

2 Propeller connection survey ................................................................................................................. 113

2.1 General ......................................................................................................................................... 1132.2 Tailshaft condition monitoring survey arrangement.................................................................... 114

3 Survey of geared thrusters for main propulsion and positioning..................................................... 114

3.1 Definitions.................................................................................................................................... 1143.2 Survey extent ............................................................................................................................... 114

4 Survey of podded thrusters for main propulsion and positioning.................................................... 114

4.1 General ......................................................................................................................................... 1144.2 Scheduled surveys........................................................................................................................ 114

5 Boiler survey .......................................................................................................................................... 114

5.1 General ......................................................................................................................................... 114

6 Thermal oil heater survey..................................................................................................................... 115

6.1 General ......................................................................................................................................... 115

7 Gas turbines survey............................................................................................................................... 115

7.1 Annual survey .............................................................................................................................. 1157.2 Renewal survey............................................................................................................................ 115

8 Survey of the unit's bottom and related items.................................................................................... 116

8.1 Schedule ...................................................................................................................................... 1168.2 Survey planning and record keeping ........................................................................................... 1168.3 Ship-shaped Units (ship or barge type units)............................................................................... 1168.4 Column-stabilised units ............................................................................................................... 1168.5 Self-elevating units ...................................................................................................................... 116

9 Survey of towing, temporary and position mooring equipment ....................................................... 116

9.1 Types of survey............................................................................................................................ 1169.2 Annual survey .............................................................................................................................. 1169.3 Intermediate survey...................................................................................................................... 1179.4 Renewal survey............................................................................................................................ 117

Sec. 5 Periodical survey extent for additional service notations ........................................... 120

1 General ................................................................................................................................................... 120

1.1 Introduction.................................................................................................................................. 120

2 Drilling units .......................................................................................................................................... 120

2.1 Introduction.................................................................................................................................. 1202.2 Annual survey .............................................................................................................................. 1202.3 Complete survey .......................................................................................................................... 120

3 Well intervention units.......................................................................................................................... 121

3.1 Introduction.................................................................................................................................. 121



Contents Page 12

3.2 Annual survey .............................................................................................................................. 1213.3 Complete survey .......................................................................................................................... 121

4 Accommodation unit ............................................................................................................................. 121


5 Crane unit .............................................................................................................................................. 122


6 Wind turbine installation vessels ......................................................................................................... 122

6.1 Introduction................................................................................................................................. 1226.2 Annual survey .............................................................................................................................. 1226.3 Complete survey .......................................................................................................................... 122

7 Offshore support vessels ....................................................................................................................... 122

7.1 Introduction................................................................................................................................. 122

Sec. 6 Optional class notation surveys ..................................................................................... 123

1 Introduction ........................................................................................................................................... 123

1.1 General ......................................................................................................................................... 123

2 Position mooring equipment ................................................................................................................ 123

2.1 Application................................................................................................................................... 1232.2 Annual survey .............................................................................................................................. 1232.3 Intermediate survey...................................................................................................................... 1232.4 Complete survey .......................................................................................................................... 123

3 Dynamic positioning systems ............................................................................................................... 123

3.1 General ......................................................................................................................................... 1233.2 Specific requirements................................................................................................................... 1243.3 Annual and complete survey........................................................................................................ 124

4 Drilling plant.......................................................................................................................................... 124

4.1 Application................................................................................................................................... 1244.2 Annual survey .............................................................................................................................. 1244.3 Complete survey .......................................................................................................................... 1274.4 DRILL (US) ................................................................................................................................ 133

5 Helicopter deck...................................................................................................................................... 133

5.1 Application................................................................................................................................... 1335.2 Complete survey .......................................................................................................................... 133

6 Well test.................................................................................................................................................. 134

6.1 Application................................................................................................................................... 1346.2 Annual and complete surveys ...................................................................................................... 134

7 Temporary oil storage........................................................................................................................... 134

7.1 Application................................................................................................................................... 1347.2 Annual survey .............................................................................................................................. 1347.3 Complete survey .......................................................................................................................... 134

8 Crane ...................................................................................................................................................... 134


9 Diving Systems....................................................................................................................................... 135

9.1 Application................................................................................................................................... 1359.2 Annual, intermediate and complete surveys ................................................................................ 135

10 Additional fire protection arrangements ............................................................................................ 135

10.1 General ......................................................................................................................................... 13510.2 Complete survey .......................................................................................................................... 135

11 Loading computers for damage control .............................................................................................. 135

11.1 Application................................................................................................................................... 13511.2 Annual survey .............................................................................................................................. 135

12 Periodically unattended machinery space and machinery centrally operated................................ 135


13 Well intervention system ...................................................................................................................... 135

13.1 Application................................................................................................................................... 13513.2 Annual survey .............................................................................................................................. 135



Contents Page 13

13.3 Complete survey .......................................................................................................................... 136

14 Hull monitoring system......................................................................................................................... 136

14.1 Application................................................................................................................................... 13614.2 General ......................................................................................................................................... 13614.3 Annual survey .............................................................................................................................. 137

15 Fatigue methodology for ship-shaped mobile offshore units ........................................................... 137

15.1 Application................................................................................................................................... 13715.2 General ......................................................................................................................................... 13715.3 Survey .......................................................................................................................................... 137

16 Noise, vibration and comfort rating .................................................................................................... 137

16.1 General ......................................................................................................................................... 137

17 Cold climate notations .......................................................................................................................... 137

17.1 Winterization................................................................................................................................ 13717.2 Annual survey .............................................................................................................................. 13717.3 Complete survey .......................................................................................................................... 138

18 Environmental notations ...................................................................................................................... 138

18.1 Ballast water management systems ............................................................................................. 13818.2 CLEAN or CLEAN DESIGN ......................................................................................... 13818.3 Recyclable.................................................................................................................................... 13818.4 Vapour control systems (VCS) .................................................................................................... 139

19 Integrated software dependent systems .............................................................................................. 139

19.1 General ......................................................................................................................................... 13919.2 Annual survey .............................................................................................................................. 13919.3 Complete survey .......................................................................................................................... 139

20 Special feature notations....................................................................................................................... 139

20.1 Non self-propelled units............................................................................................................... 13920.2 Tailshaft monitoring..................................................................................................................... 139

Sec. 7 Alternative survey arrangements .................................................................................. 141

1 General ................................................................................................................................................... 141

1.1 General ......................................................................................................................................... 141

2 Machinery survey arrangements ......................................................................................................... 145

2.1 General ......................................................................................................................................... 1452.2 Machinery continuous.................................................................................................................. 1452.3 Machinery PMS (planned maintenance system).......................................................................... 1462.4 PMS RCM (reliability centred maintenance) .............................................................................. 1462.5 Offshore CM (condition monitoring)........................................................................................... 149

3 Drilling equipment survey arrangements ........................................................................................... 151

3.1 General ......................................................................................................................................... 1513.2 Drilling equipment continuous survey arrangement (DCSA) ..................................................... 1513.3 Drilling equipment PMS RCM .................................................................................................... 1513.4 Drilling equipment condition monitoring survey arrangement (DCMSA)................................. 151

4 Hull survey arrangements .................................................................................................................... 151

4.1 General ......................................................................................................................................... 1514.2 Structural continuous survey arrangement................................................................................... 1514.3 Structural integrity management (SIM) ....................................................................................... 152

Sec. 8 Surveys performed by approved companies ................................................................ 153

1 Surveys by approved companies.......................................................................................................... 153

1.1 General ......................................................................................................................................... 1531.2 Thickness measurements ............................................................................................................. 1531.3 Bottom survey afloat................................................................................................................... 1531.4 Non-destructive testing ................................................................................................................ 1531.5 Mooring chain inspections........................................................................................................... 1531.6 Condition monitoring................................................................................................................... 153

App. A Introduction to offshore classification ......................................................................... 155

App. B Mooring equipment acceptance standard guidance .................................................... 158

CHANGES HISTORIC ............................................................................................................... 161



Ch.1 Sec.1 Introduction Page 14

CHAPTER 1 PRINCIPLES AND PROCEDURES FOR CLASSIFICATION

SECTION 1 INTRODUCTION

1 Introduction

1.1 General

1.1.1 This publication presents DNVs Rules for Classification of Offshore Drilling and Support Units, theterms and procedures for assigning and maintaining classification, including listing of the applicable technicalreferences to be applied for classification.

1.2 Organisation of DNV-OSS-101

1.2.1 DNV-OSS-101 is divided into three main chapters as follows:

Chapter 1: providing general information about classification principles and procedures Chapter 2: providing design and construction requirements for the newbuilding phase Chapter 3: providing requirements for maintenance of class in the operational phase.

1.3 Objects covered

1.3.1 DNV-OSS-101 covers classification of mobile offshore units (units) of the following design types:

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

for the following services:

drilling well intervention accommodation heavy-lifting general offs

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

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