OFFSHORE SERVICE SPECIFICATIONDNV-OSS-102

RULES FOR CLASSIFICATION OF FLOATING PRODUCTION

AND STORAGE UNITSOCTOBER 2003DET NORSKE VERITAS

FOREWORDDET NORSKE VERITAS (DNV) is an autonomous and independent foundation with the objectives of safeguarding life, prop-erty and the environment, at sea and onshore. DNV undertakes classification, certification, and other verification and consultancyservices relating to quality of ships, offshore units and installations, and onshore industries worldwide, and carries out researchin relation to these functions.DNV Offshore Codes consist of a three level hierarchy of documents: Offshore Service Specifications. Provide principles and procedures of DNV classification, certification, verification and con-

sultancy services. Offshore Standards. Provide technical provisions and acceptance criteria for general use by the offshore industry as well as

the technical basis for DNV offshore services. Recommended Practices. Provide proven technology and sound engineering practice as well as guidance for the higher level

Offshore Service Specifications and Offshore Standards.DNV Offshore Codes are offered within the following areas:

A) Qualification, Quality and Safety MethodologyB) Materials TechnologyC) StructuresD) SystemsE) Special FacilitiesF) Pipelines and RisersG) Asset OperationH) Marine Operations

Amendments and Corrections This document is valid until superseded by a new revision. Minor amendments and corrections will be published in a separatedocument on the DNV web-site; normally updated twice per year (April and October). To access the web-site, select short-cutoptions "Technology Services" and "Offshore Rules and Standards" at http://www.dnv.com/ The electronic web-versions of the DNV Offshore Codes will be regularly updated to include these amendments and corrections.Comments may be sent by e-mail to rules@dnv.comFor subscription orders or information about subscription terms, please use distribution@dnv.comComprehensive information about DNV services, research and publications can be found at http://www.dnv.com, or can be obtained from DNV, Veritasveien 1, NO-1322 Hvik, Norway; Tel +47 67 57 99 00, Fax +47 67 57 99 11.

Det Norske Veritas. All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, including photocopying and recording, without the prior written consent of Det Norske Veritas.

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Offshore Service Specification DNV-OSS-102, October 2003Changes Page 3CHANGES IN THE RULESThe present edition of the rules includes amendments and ad-ditions decided by the Executive Board in September 2003 andsupersedes the April 2002 edition. The changes come into force 1 April 2004.

Main changes GeneralThe rules have been updated in line with new IACS require-ments and feedback from the users on the previous issue. Themain changes are described below.

Chapter 1 Principles and Procedures for Classification

Handling of alternatives and deviations. Rule basis for class in the operational phase.

Chapter 2 Design and Construction Provisions

Handling of industrial equipment under service notations(process equipment to be included in Production Unitclass).

Chapter 3 Classification in Operation

Incorporation of IACS unified requirements Z15 "Hull,Structure, Equipment and Machinery Surveys of MobileOffshore Drilling Units".

A new sub-section on continuous hull survey. Special provisions for ageing units. Formalising the in-service inspection program (IIP) as part

of the class documentation. The sub-section on thrusters surveys has been completely

re-written to reflect current ship practice. The handling of industrial equipment under mandatory

service notations has been clarified. The sub-section on periodical inspection of mooring sys-

tems for long term units has been extensively revised, in-troducing variations depending on the design, such ascorrosion protection and or allowance and fatigue.

Appendix C Underwater Inspection in Lieu of Dry-docking Survey

A new Appendix C concerning underwater inspection, inlieu of dry-docking survey, has been introduced (IACSUR Z15).

Corrections and ClarificationsIn addition to the above mentioned rule changes, a number ofcorrections and clarifications have been made to the existingrule text.DET NORSKE VERITAS

Offshore Service Specification DNV-OSS-102, October 2003Page 4 ChangesDET NORSKE VERITAS

Offshore Service Specification DNV-OSS-102, October 2003 Contents Page 5CONTENTS

CH. 1 PRINCIPLES AND PROCEDURES FOR CLASSIFICATION............................................ 11

Sec. 1 Introduction......................................................... 13

A. General..................................................................................13A 100 General............................................................................13A 200 Organisation of DNV-OSS-102......................................13A 300 Objects covered...............................................................13B. Definitions ............................................................................ 13B 100 Verbal forms ...................................................................13B 200 Definitions ......................................................................13

C. Normative References ..........................................................14C 100 General............................................................................14C 200 DNV reference documents..............................................14C 300 Other references.............................................................. 14

D. Informative References.........................................................14D 100 DNV Offshore Service Specifications............................14D 200 Other references.............................................................. 14

E. Abbreviations........................................................................ 15E 100 General............................................................................15

Sec. 2 Classification Principles ..................................... 16

A. The Classification Concept...................................................16A 100 Introduction.....................................................................16A 200 Entering into force and application of rules....................16A 300 Basis for assignment of class ..........................................16A 400 Basis for maintenance of class........................................ 16A 500 Documentation................................................................17A 600 Disclosure of information ...............................................17A 700 Limitation of DNV's responsibility ................................17A 800 Vertical contract audits and audits by national

maritime authorities ........................................................17

Sec. 3 Classification Scope and Notations ................... 18

A. Scope of Classification .........................................................18A 100 General............................................................................18A 200 Rule parts ........................................................................18A 300 Rule particulars ...............................................................18

B. Class Notations .....................................................................18B 100 General............................................................................18B 200 Construction symbols .....................................................18B 300 Main character of class ................................................... 18B 400 Basic design notations ....................................................18B 500 Service notations.............................................................19B 600 System and special facility notations..............................19B 700 Special feature notations.................................................20B 800 Limitations of class.........................................................20B 900 Compliance with shelf state legislation .......................... 20B 1000 Combination of notations ...............................................20

Sec. 4 Classification Procedure .................................... 21

A. Assignment of Class .............................................................21A 100 Request for classification................................................21A 200 Requirements for workshops and yards.......................... 21A 300 Information about subcontractors and suppliers of

products...........................................................................21A 400 Requirements for manufacturers.....................................21A 500 Requirements for suppliers of services...........................21A 600 Requirements for calibration of equipment ....................21A 700 Document approval.........................................................21A 800 Survey .............................................................................21A 900 Functional testing............................................................22A 1000 Certification of materials, components and systems ......22A 1100 Manufacturing survey arrangement ................................23A 1200 Type approval .................................................................23A 1300 Acceptance of control by national authorities ................23

A 1500 Classification certificate ................................................. 23A 1600 Appendix to the classification certificate ....................... 23A 1700 Entry in the Register of vessels classed by DNV........ 23A 1800 Decline of application for classification ......................... 23

B. Retention of Class.................................................................24B 100 General............................................................................ 24B 200 Periodical and renewal surveys ...................................... 24B 300 Survey of damage ........................................................... 24B 400 Repairs ............................................................................ 24B 500 Procedures for maintenance............................................ 24B 600 Conversions and alterations............................................ 24B 700 Change of ownership ...................................................... 25B 800 Conditions of class and memoranda ............................... 25B 900 Survey reports and survey status .................................... 25

C. Validity and Issuance of the Classification Certificate.........25C 100 Validity of the certificate ................................................ 25C 200 Issuance of certificate ..................................................... 25

D. Suspension and Withdrawal of Class ...................................25D 100 General............................................................................ 25D 200 Suspension of class ......................................................... 26D 300 Withdrawal of class ........................................................ 26D 400 Reclassification............................................................... 26

E. Appeals .................................................................................26E 100 Decisions taken by DNV ................................................ 26

Sec. 5 Legal Provisions.................................................. 27

A. Liability and Jurisdiction ......................................................27A 100 Limited liability .............................................................. 27A 200 Governing law ................................................................ 27A 300 Venue.............................................................................. 27

CH. 2 DESIGN AND CONSTRUCTION PROVISIONS ..................................................... 29

Sec. 1 Design and Construction Requirements for 1A1 MOU Main Class ................................................. 31

A. General..................................................................................31A 100 Introduction..................................................................... 31A 200 Technical reference documents ...................................... 31A 300 General assumptions ....................................................... 31A 400 Documentation................................................................ 31

B. Safety Principles and Arrangement ......................................31B 100 General............................................................................ 31B 200 Design principles ............................................................ 31B 300 Arrangement ................................................................... 31B 400 Escape and evacuation.................................................... 31B 500 Documentation requirements.......................................... 31

C. Materials ...............................................................................31C 100 Technical requirements................................................... 31C 200 Supplementary classification requirements .................... 32

D. Structural Design ..................................................................32D 100 Technical requirements................................................... 32D 200 Documentation requirements.......................................... 32

E. Fabrication and Testing of Offshore Structures....................32E 100 Technical requirements................................................... 32E 200 Documentation requirements.......................................... 32E 300 Supplementary classification requirements .................... 32

F. Stability and Watertight/Weathertight Integrity ..................32F 100 Technical requirements................................................... 32F 200 Documentation requirements.......................................... 32

G. Mooring and Towing ............................................................32G 100 General............................................................................ 32G 200 Ship-shaped units............................................................ 32DET NORSKE VERITAS

A 1400 Certificate of interim class..............................................23 G 300 Column-stabilised units .................................................. 33

Offshore Service Specification DNV-OSS-102, October 2003Page 6 ContentsG 400 Self-elevating, tension leg and deep draught units .........33G 500 Towing ............................................................................33G 600 Documentation requirements ..........................................33G 700 Supplementary classification requirements ....................33

H. Marine and Machinery Systems and Equipment.................. 33H 100 Technical requirements ...................................................33H 200 Documentation requirements ..........................................33H 300 Supplementary classification requirements ....................33

I. Electrical Systems and Equipment ....................................... 33I 100 Technical requirements ...................................................33I 200 Documentation requirements ..........................................33I 300 Supplementary classification requirements ....................33

J. Instrumentation and Telecommunication Systems............... 33J 100 Technical requirements ...................................................33J 200 Documentation requirements ..........................................33J 300 Supplementary classification requirements ....................34

K. Fire Protection ...................................................................... 34K 100 Technical requirements ...................................................34K 200 Documentation requirements ..........................................34K 300 Supplementary classification requirements ....................34

L. Summary of Technical Reference Standards........................ 34L 100 General ............................................................................34

Sec. 2 Design and Construction Requirements for OI Floating Offshore Installation Main Class ........................................................... 36

A. General.................................................................................. 36A 100 Introduction.....................................................................36A 200 Technical reference documents.......................................36A 300 General assumptions .......................................................36A 400 Documentation ................................................................36A 500 Certification of materials and components .....................36

B. Safety Principles and Arrangement ...................................... 36B 100 General ............................................................................36B 200 Design principles.............................................................36B 300 Arrangement....................................................................36B 400 Escape and evacuation ....................................................36B 500 Documentation requirements ..........................................36

C. Materials ............................................................................... 37C 100 Technical requirements ...................................................37C 200 Supplementary classification requirements ....................37

D. Structural Design .................................................................. 37D 100 Technical requirements ...................................................37D 200 Documentation requirements ..........................................37

E. Fabrication and Testing of Offshore Structures ................... 37E 100 Technical requirements ...................................................37E 200 Documentation requirements ..........................................37E 300 Supplementary classification requirements ....................37

F. Stability and Watertight Integrity ......................................... 37F 100 Technical requirements ...................................................37F 200 Documentation requirements ..........................................37

G. Mooring and Towing ............................................................ 37G 100 General ............................................................................37G 200 Supplementary classification requirements ....................38

H. Utility Systems and Equipment ............................................ 38H 100 Technical requirements ...................................................38H 200 Documentation requirements ..........................................38H 300 Supplementary classification requirements ....................38

I. Electrical Systems and Equipment ....................................... 38I 100 Technical requirements ...................................................38I 200 Documentation requirements ..........................................38I 300 Supplementary classification requirements ....................38

J. Instrumentation and Telecommunication Systems............... 38J 100 Technical requirements ...................................................38J 200 Documentation requirements ..........................................38

K. Fire Protection ......................................................................38K 100 Technical requirements ...................................................38K 200 Documentation requirements ..........................................38K 300 Supplementary classification requirements ....................39

L. Summary of Technical Reference Standards........................39L 100 General ............................................................................39

Sec. 3 Supplementary Requirements for Service Notation Oil Production Unit or Oil Production Installation ......................................................... 40

A. General..................................................................................40A 100 Introduction.....................................................................40A 200 Documentation requirements ..........................................40

B. Safety Principles and Arrangement ......................................40B 100 General ............................................................................40B 200 Arrangement....................................................................40B 300 Area classification...........................................................40B 400 Emergency shutdown......................................................40B 500 Escape, evacuation and communication .........................40B 600 Supplementary documentation requirements..................40

C. Structural Design ..................................................................40C 100 General ............................................................................40C 200 Supplementary technical requirements ...........................40C 300 Supplementary documentation requirements..................40

D. Marine and Machinery and Utility Systems .........................40D 100 General ............................................................................40D 200 Supplementary technical requirements ...........................40

E. Fire Protection ......................................................................40E 100 General ............................................................................40E 200 Supplementary technical requirements ...........................40E 300 Supplementary documentation requirements..................40

F. Position Keeping...................................................................41F 100 General ............................................................................41

G. Industrial Equipment ............................................................41G 100 General ............................................................................41

H. Preparation for Surveys and Inspections on Location ..........41H 100 General ............................................................................41

Sec. 4 Supplementary Requirements for Service Notation Oil Storage Unit or Oil Storage Installation ......................................................... 42

A. General..................................................................................42A 100 Introduction.....................................................................42A 200 Documentation requirements ..........................................42

B. Safety Principles and Arrangement ......................................42B 100 General ............................................................................42B 200 Arrangement....................................................................42B 300 Area classification...........................................................42B 400 Emergency shutdown......................................................42B 500 Escape, evacuation and communication .........................42B 600 Supplementary documentation requirements..................42

C. Structural Design ..................................................................42C 100 General ............................................................................42C 200 Supplementary technical requirements ...........................42C 300 Supplementary documentation requirements..................42

D. Marine and Machinery or Utility Systems and Equipment ..42D 100 General ............................................................................42D 200 Supplementary technical requirements ...........................42D 300 Supplementary documentation requirements..................42

E. Fire Protection ......................................................................42E 100 General ............................................................................42E 200 Supplementary technical requirements ...........................42DET NORSKE VERITAS

J 300 Supplementary classification requirements ....................38 E 300 Supplementary documentation requirements..................42

Offshore Service Specification DNV-OSS-102, October 2003 Contents Page 7F. Position Keeping................................................................... 43F 100 General............................................................................43

G. Preparation for Surveys and Inspections on Location .......... 43G 100 General............................................................................43

Sec. 5 Design and Construction Requirements for System and Special Facility Notations............... 44

A. Introduction ..........................................................................44A 100 General............................................................................44A 200 Technical reference documents ......................................44A 300 General assumptions ....................................................... 44A 400 Documentation ...............................................................44

B. Position Mooring System .....................................................44B 100 General............................................................................44B 200 Technical requirements................................................... 44B 300 Documentation requirements..........................................44B 400 Certification of materials and components .....................45

C. Dynamic Positioning Systems ..............................................45C 100 General............................................................................45C 200 Technical requirements................................................... 45C 300 Documentation requirements..........................................45

D. Single Point Mooring (SPM)................................................45D 100 General............................................................................45D 200 Technical requirements................................................... 45D 300 Documentation requirements..........................................45

E. Crude Oil Offloading System...............................................45E 100 General............................................................................45E 200 Technical requirements................................................... 45

F. Bow Loading ........................................................................ 45F 100 General............................................................................45F 200 Technical requirements................................................... 45F 300 Documentation requirements..........................................45

G. Submerged Turret Loading...................................................45G 100 General............................................................................45G 200 Technical requirements................................................... 45G 300 Documentation requirements..........................................45

H. Hydrocarbon Production Plant ............................................. 45H 100 General............................................................................45H 200 Technical requirements................................................... 45H 300 Documentation requirements..........................................45H 400 Certification of materials and components .....................46

I. Drilling Plant ........................................................................ 46I 100 General............................................................................46I 200 Technical requirements................................................... 46I 300 Documentation requirements..........................................46I 400 Certification of materials and components .....................46

J. Helicopter Decks ..................................................................46J 100 General............................................................................46J 200 Technical requirements................................................... 46J 300 Documentation requirements..........................................46

K. Crane Installations ............................................................... 46K 100 General............................................................................46K 200 Technical requirements................................................... 46K 300 Documentation requirements..........................................46K 400 Certification of materials and components .....................46

L. Additional Fire Protection ...................................................46L 100 General............................................................................46L 200 Technical requirements................................................... 46L 300 Documentation requirements..........................................46

M. De-icing and Anti-icing Systems..........................................46M 100 General............................................................................46M 200 Technical requirements................................................... 47M 300 Documentation requirements..........................................47

N. Periodically Unattended Machinery Space...........................47N 100 General............................................................................47

N 300 Documentation requirements.......................................... 47

O. Integrated Computer Systems...............................................47O 100 General............................................................................ 47O 200 Technical requirements................................................... 47O 300 Documentation requirements.......................................... 47

P. Hull Monitoring System .......................................................47P 100 General............................................................................ 47P 200 Technical requirements................................................... 47P 300 Documentation requirements.......................................... 47

Q. Operation in Ice Conditions..................................................47Q 100 General............................................................................ 47Q 200 Technical requirements................................................... 47Q 300 Documentation requirements.......................................... 47R. Vapour Control Systems.......................................................47R 100 General............................................................................ 47R 200 Technical requirements................................................... 47R 300 Documentation requirements.......................................... 48

S. Management of Safety and Environmental Protection.........48S 100 General............................................................................ 48S 200 Technical requirements................................................... 48

T. Special Feature Notations .....................................................48T 100 General............................................................................ 48T 200 Special feature notation SUB ......................................... 48T 300 Special feature notation HOT(C).............................. 48T 400 Special feature notation COAT-1 and COAT-2............ 48T 500 Tailshaft monitoring - TMON ........................................ 48

U. Summary of Reference Documents for Additional Class Notations...............................................................................49

U 100 General............................................................................ 49

CH. 3 CLASSIFICATION IN OPERATION............. 51

Sec. 1 General Provisions for Periodical Surveys ...... 53

A. General..................................................................................53A 100 Introduction..................................................................... 53A 200 Survey pre-planning and record keeping ....................... 53A 300 Accessibility and facilities for surveys on location ........ 53

B. Principles ..............................................................................53B 100 General............................................................................ 53B 200 Due date and survey windows ........................................ 53B 300 Postponement of periodical surveys ............................... 53

C. Periodical Surveys and Intervals ..........................................53C 100 Survey intervals and concurrent surveys ........................ 53C 200 Annual surveys ............................................................... 55C 300 Intermediate surveys ....................................................... 56C 400 Renewal surveys ............................................................. 56C 500 Other periodical surveys ................................................. 56

D. Alternative Survey Arrangements ........................................56D 100 Continuous hull surveys ................................................. 56D 200 Surveys by the chief engineer or maintenance

supervisor........................................................................ 56D 300 Survey arrangement based on approved planned

maintenance system ........................................................ 57D 400 Survey arrangement based on condition monitoring

system ............................................................................. 57D 500 Surveys of units or installations out of commission....... 57

E. Special Provisions for Hull Surveys .....................................58E 100 General............................................................................ 58E 200 Access to structures ........................................................ 58E 300 Equipment for survey ..................................................... 58

F. Requirements for Machinery Surveys ..................................58F 100 Maintenance system........................................................ 58

G. Procedures for Class Related Services .................................58G 100 Thickness measurements of hull structures .................... 58

H. Repairs of Structural Damage...............................................58DET NORSKE VERITAS

N 200 Technical requirements................................................... 47 H 100 Definition........................................................................ 58

Offshore Service Specification DNV-OSS-102, October 2003Page 8 ContentsH 200 Repairs ............................................................................58

I. Special Provisions for Ageing Units ................................... 59I 100 General ............................................................................59I 200 Column-stabilised units...................................................59I 300 Self-elevating units .........................................................59I 400 Ship-shaped units ............................................................59

J. Risk Based Inspection (RBI) ................................................ 60J 100 General about RBI ..........................................................60J 200 Methodology for offshore structures...............................60J 300 Use of RBI for classed units ...........................................60

Sec. 2 Periodical Survey Extent for Main Class ......... 61

A. General.................................................................................. 61A 100 Introduction....................................................................61A 200 Extent of hull survey .......................................................61

B. Annual Survey ...................................................................... 64B 100 Survey extent...................................................................64B 200 Structure and equipment for ship-shaped units...............64B 300 Structure and equipment for column-stabilised and

self-elevating units ..........................................................64B 400 Machinery and safety systems for ship-shaped units

or installations .................................................................65B 500 Machinery and safety systems for column-stabilised

and self-elevating units or installations...........................65

C. Intermediate Survey.............................................................. 65C 100 General ............................................................................65C 200 Structure and equipment for ship-shaped units...............65C 300 Structure and equipment for column-stabilised and

self-elevating units or installations .................................66C 400 Machinery and safety systems for ship-shaped units

or installations .................................................................66C 500 Machinery and safety systems for column-stabilised

and self-elevating units or installations...........................66

D. Renewal Survey, Structure and Equipment.......................... 66D 100 Ship-shaped structures ....................................................66D 200 Column-stabilised and self-elevating structures ...........66D 300 Alternative survey ...........................................................67

E. Renewal Survey, Machinery and Safety Systems ................ 67E 100 General ............................................................................67E 200 Electrical Installations.....................................................67E 300 Instrumentation and automation......................................68

F. Renewal Survey, Tailshaft Survey ....................................... 69F 100 Standard requirements.....................................................69F 200 Alternative survey ...........................................................70F 300 Tailshaft condition monitoring survey arrangement .......70

G. Thrusters ............................................................................... 70G 100 Definitions.......................................................................70G 200 Condition monitoring approach - extent of survey and

testing ..............................................................................70G 300 Extent of survey and testing without condition

monitoring system...........................................................70

H. Renewal Surveys, Boiler and Steam Heated Steam Generator .............................................................................. 71

H 100 Renewal survey ...............................................................71

I. Thermal Oil Heater Survey................................................... 71I 100 Renewal survey ...............................................................71

J. Survey of the Outside of Unit's Bottom and Related Items.71J 100 Schedule .........................................................................71J 200 Parts to be examined ......................................................71J 300 Survey planning and record keeping ..............................72

Sec. 3 Periodical Survey Extent for Additional Service Notations .............................................................. 73

A. General.................................................................................. 73A 100 Introduction.....................................................................73

B. Oil Production and/or Oil Storage Units and Installations ... 73

B 200 Survey arrangement ........................................................73B 300 Annual survey .................................................................73B 400 Complete periodical survey ............................................73

Sec. 4 Periodical Survey Extent for Additional System and Special Facility Notations ........................... 75

A. General..................................................................................75A 100 Introduction.....................................................................75

B. Position Mooring Equipment................................................75B 100 Application......................................................................75B 200 Types of surveys .............................................................75B 300 Annual survey .................................................................75B 400 Intermediate survey.........................................................75B 500 Complete periodical survey ............................................75B 600 Complete periodical survey - systems designed

before 1996 .....................................................................75B 700 Complete periodical survey fatigue design life

factor 3 ............................................................................76B 800 Complete periodical survey fatigue life factor 5-8 or

greater..............................................................................76

C. Dynamic Positioning System................................................77C 100 Application......................................................................77C 200 Complete periodical survey ............................................77

D. Offshore Crude Offloading...................................................77D 100 Application......................................................................77D 200 Complete periodical survey ............................................77

E. Offshore Bow Loading .........................................................78E 100 Application......................................................................78E 200 Complete periodical survey ............................................78

F. Production Plant....................................................................78F 100 Application......................................................................78F 200 Survey arrangement ........................................................78F 300 Annual survey .................................................................78F 400 Complete periodical survey ............................................79

G. Drilling Plant ........................................................................79G 100 Application......................................................................79G 200 Annual survey .................................................................79G 300 Complete periodical survey ............................................79

H. Helicopter Deck ....................................................................80H 100 Application......................................................................80H 200 Complete periodical survey ............................................80

I. Crane.....................................................................................80I 100 Application......................................................................80I 200 Annual survey .................................................................80I 300 Complete periodical survey ............................................80

J. De-icing and Anti-icing Systems..........................................80J 100 Application......................................................................80J 200 Annual survey .................................................................80

K. Periodically Unattended Machinery Space and Machinery Centralised Operated ............................................................80

K 100 Application......................................................................80K 200 Annual survey .................................................................80K 300 Complete periodical survey ............................................81

L. Additional Fire Protection ....................................................81L 100 Application......................................................................81L 200 Complete periodical survey, all F-class notations ..........81L 300 Complete periodical survey, F-A ....................................81L 400 Complete periodical survey, F-M ...................................81L 500 Complete periodical survey, F-C ....................................81L 600 Complete periodical survey, F-AM ................................81L 700 Complete periodical survey, F-AC .................................81L 800 Complete periodical survey, F-MC ................................81L 900 Complete periodical survey, F-AMC..............................81

M. Integrated Computer Systems...............................................81M 100 Application......................................................................81DET NORSKE VERITAS

B 100 Application......................................................................73 M 200 Complete periodical survey ............................................81

Offshore Service Specification DNV-OSS-102, October 2003 Contents Page 9N. Hull Monitoring System .......................................................82N 100 Application......................................................................82N 200 General............................................................................82N 300 Annual survey.................................................................82

O. Vapour Control Systems.......................................................82O 100 Application......................................................................82O 200 Complete periodical survey ............................................ 82

P. Safety and Environmental Protection Management System 82P 100 Application......................................................................82P 200 Survey requirements ....................................................... 82

Q. Tailshaft Monitoring.............................................................82Q 100 Application......................................................................82Q 200 General............................................................................82Q 300 Annual survey.................................................................83Q 400 Dismantling of propellers ...............................................83App. A Special Considerations for Conversions ........... 84A. Basic Principles ....................................................................84A 100 Introduction.....................................................................84A 200 Assumptions ...................................................................84A 300 Main principles ...............................................................84

B. Class Notations .....................................................................84B 100 Conversions ....................................................................84

C. Technical Guidance for Classification .................................84C 100 General............................................................................84C 200 Hull and topside structures .............................................84C 300 Hull condition .................................................................85C 400 Hull strength in benign environment ..............................85C 500 Fatigue assessment..........................................................85C 600 Topside support structure................................................85C 700 Mooring ..........................................................................85C 800 Marine systems and equipment.......................................85C 900 Electrical and instrumentation ........................................ 85C 1000 Safety systems and arrangement.....................................86

D. Additional Services............................................................... 86D 100 General............................................................................86

App. B Introduction to Offshore Classification............ 87

A. Introduction...........................................................................87A 100 Purpose ........................................................................... 87

B. The Classification System ....................................................87B 100 The classification process and its limitations ................. 87B 200 Who needs classification?............................................... 87B 300 Recognition of DNV....................................................... 87B 400 Responsibility for safety at sea ....................................... 87B 500 Classification of newbuildings ....................................... 87B 600 Classification in the operational phase ........................... 88B 700 Owner's duties................................................................. 88

C. Remuneration........................................................................88C 100 Fee system ...................................................................... 88

D. Classification Support...........................................................88D 100 General............................................................................ 88D 200 Pre-contract support........................................................ 88D 300 In-service support ........................................................... 88D 400 Limitations...................................................................... 88

App. C Underwater Inspection in Lieu of Dry-docking Survey................................................................... 89

A. Introduction...........................................................................89A 100 General............................................................................ 89

B. Conditions.............................................................................89B 100 Limitations...................................................................... 89B 200 Thickness gauging and non-destructive testing.............. 89B 300 Plans and data ................................................................. 89B 400 Underwater conditions.................................................... 89

C. Physical Features ..................................................................89C 100 General ........................................................................... 89C 200 Stern bearing................................................................... 89C 300 Rudder bearings .............................................................. 89C 400 Sea suctions .................................................................... 89C 500 Sea valves ....................................................................... 89DET NORSKE VERITAS

DET NORSKE VERITAS

Offshore Service Specification DNV-OSS-102, October 2003Page 10 Contents

OFFSHORE SERVICE SPECIFICATIONDNV-OSS-102RULES FOR CLASSIFICATION OF FLOATINGPRODUCTION AND STORAGE UNITS

CHAPTER 1

PRINCIPLES AND PROCEDURES FOR CLASSIFICATION

CONTENTS PAGE

Sec. 1 Introduction .............................................................................................................................. 13Sec. 2 Classification Principles ........................................................................................................... 16Sec. 3 Classification Scope and Notations.......................................................................................... 18Sec. 4 Classification Procedure........................................................................................................... 21Sec. 5 Legal Provisions....................................................................................................................... 27DET NORSKE VERITASVeritasveien 1, NO-1322 Hvik, Norway Tel.: +47 67 57 99 00 Fax: +47 67 57 99 11

Offshore Service Specification DNV-OSS-102, October 2003Ch.1 Sec.1 Page 13SECTION 1INTRODUCTION

A. GeneralA 100 General101 This publication, DNV-OSS-102, presents DNVsRules for Classification of Floating Production and StorageUnits or Installations, stating the terms and procedures for as-signing and maintaining classification, including listing of theapplicable technical references to be applied for classification.

A 200 Organisation of DNV-OSS-102201 DNV-OSS-102 is divided into three main chapters asfollows:

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

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

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

A 300 Objects covered301 DNV-OSS-102 covers classification of offshore objectsof the following designs:

ship-shaped type column-stabilised type self-elevating type tension-leg type deep draught type

for the following services:

hydrocarbon production hydrocarbon storage and offloading.

B. DefinitionsB 100 Verbal forms101 Shall: Indicates a mandatory requirement to be fol-lowed for fulfilment or compliance with the present servicespecification. Deviations are not permitted unless formally andrigorously justified, and accepted by all relevant contractingparties. 102 Should: Indicates that among several possibilities one isrecommended as particularly suitable, without mentioning orexcluding others, or that a certain course of action is preferredbut not necessarily required. Other possibilities may be appliedsubject to agreement.103 May: Verbal form used to indicate a course of actionpermissible within the limits of the service specification.

B 200 Definitions201 Approval or approved: Denotes acceptance by DNV ofdocumentation showing design solutions, arrangements and/orequipment to comply with the rules.202 Assigning class: Originally signified designation of oneof several classes to a ship based on its condition, ranging fromgood to bad. Today only the highest class is assigned, com-prising the main class 1A1 for mobile offshore units and OI forpermanently placed installations, together with an obligatoryadditional class notation, e.g. Oil Production Unit, whereapplicable.

ering special service, equipment or systems, e.g. PROD denot-ing a classed hydrocarbon production plant. 203 The Board: Signifies the Executive Board of DNVthrough its Chairman who is the President and CEO of DNV.204 CIBS: Classification Information Breakdown Structure(coding system for documentation). 205 Classification: Comprises those services rendered byDNV in accordance with the rules. Classification of offshoreunits is conducted in accordance with the requirements of therules and any standards referred to by the rules.206 Classification certificate: Issued upon assignment or re-newal of class. Its validity is five years subject to successfulcompletion of annual and intermediate surveys. 207 Client: The party having requested classification or hav-ing assumed ownership of a classed offshore unit or installa-tion. In cases where owners have authorised another party tooperate the unit or installation on their behalf, such party is re-garded as the client. 208 Close-up examination: An examination where the de-tails of structural components are within the close visual in-spection range of the surveyor, i.e. preferably within reach ofhand.209 Contract: The specific agreement between DNV and theclient. It defines the extent of services requested by the client,and is concerned with:

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

statutory work carried out on behalf of national maritimeauthorities

equipment and materials.

210 Det Norske Veritas (DNV): An autonomous and inde-pendent foundation with the object of safeguarding life, prop-erty and the environment. 211 Floating offshore installation: A bouyant constructionengaged in offshore operations including drilling, production,storage or support functions, and which is designed and builtfor installation at a particular offshore location.212 Guidance note: Advice which is not mandatory for as-signment of class, but with which DNV, in light of general ex-perience, advises compliance. The client may decide whetherto apply the note or not.213 IACS: The International Association of ClassificationSocieties.214 IMO: The International Maritime Organization.215 International maritime standards: International IMOconventions, protocols, codes and resolutions, in so far as theirpurpose is safety and pollution prevention, excluding articlesand regulations dealing with intergovernmental relations, legaland formal aspects.216 LRFD methodology: Load and resistance factor designmethodology.217 Mobile offshore unit: A buoyant construction engaged inoffshore operations including drilling, production, storage orsupport functions, not intended for service at one particularoffshore location, and which can be relocated without majordismantling or modification.218 Offshore installation: A collective term to cover anyconstruction, buoyant or non-bouyant, designed and built forDET NORSKE VERITAS

Voluntary additional class notations may also be assigned cov- installation at a particular offshore location.

Offshore Service Specification DNV-OSS-102, October 2003Page 14 Ch.1 Sec.1219 Overall examination: An examination intended to reporton the overall condition of the structure. 220 Quality audit: A systematic and independent examina-tion to determine whether established work processes andquality systems are adhered to.221 Recognised classification society: A classification soci-ety which is a full or associate member of IACS. 222 The Rules: All rule requirements accepted by the Boardas basis for classification. 223 The Society: Signifies DNV.224 Statutory certificates: IMO convention certificates is-sued on behalf of, or by, national authorities.225 Supplier or manufacturer: Supplies materials, compo-nents, equipment and systems to newbuildings to be classed, orto classed units in operation, whose production is subject to de-sign approval, surveys and testing in accordance with the rules. 226 Temporary conditions: Design conditions not coveredby operating conditions, e.g. conditions during fabrication,mating and installation phases, dry transit phases.227 Tentative rules and standards: Apply to new fields towhich DNV reserves the right to make adjustments during aperiod in order to obtain the purpose intended.228 Transit conditions: All wet unit movements from onegeographical location to another.229 Vertical contract audit: An IACS audit which assessesthe correct application of the quality system through audit ofthe process for a specific contract. The IACS QSCS (QualitySystem Certification Scheme) audit team is responsible forcarrying out these audits.230 WSD methodology: Working stress design methodolo-gy.

C. Normative ReferencesC 100 General101 DNV-OSS-102 includes references to other DNV docu-ments and recognised codes and standards which shall be usedin conjunction with the requirements given in this documentfor assignment of class.

C 200 DNV reference documents201 The latest revision of the documents listed in Table C1applies.

C 300 Other references301 The latest revision of the documents listed in Table C2applies.

D. Informative ReferencesD 100 DNV Offshore Service Specifications101 The publications in Table D1 are referenced in the textof this document, and may be used as a source of supplemen-tary services and information. 102 The latest revision of the documents listed in Table D1applies.

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

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

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

method)DNV-OS-C105 Structural Design of TLPs (LRFD method)DNV-OS-C106 Structural Design of Deep Draught Floating

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

od) DNV-OS-C301 Stability and Watertight IntegrityDNV-OS-C401 Fabrication and Testing of Offshore StructuresDNV-OS-D101 Marine and Machinery Systems and Equipment

DNV-OS-D202 Instrumentation and Telecommunication Sys-tems

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

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

Table C2 Non-DNV normative reference documentsReference TitleAPI RP 2SK Design and Analysis of Stationkeeping Systems

for Floating StructuresIACS Shipbuilding and Repair Quality Standard

Table D1 DNV informative referencesReference TitleDNV-OSS-101 Rules for Classification of Offshore Drilling

and Support UnitsDNV-OSS-103 Rules for Classification of LNG/LPG Floating

Production and Storage Units or InstallationsDNV-OSS-202 Verification for Compliance with UK Shelf

Regulations Classification Note 30.7

Fatigue Assessment of Ship Structures

Classification Note 72.1

Allowable Thickness Diminution for Hull Structures

Standard for Certi-fication 1.2

Type Approval

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

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

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

PD 5500(Previous BS

Specification for unfired fusion welded pres-sure vessels

Table C1 DNV reference documents (Continued)Reference TitleDET NORSKE VERITAS

DNV-OS-D201 Electrical Installations 5500)

Offshore Service Specification DNV-OSS-102, October 2003Ch.1 Sec.1 Page 15E. AbbreviationsE 100 General101 The abbreviations given in Table E1 are used in thisstandard.

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

tution)DFF Design fatigue factorsDNV Det Norske VeritasDP dynamic positioning

IC inspection categoryIIP in service inspection programISO International Organisation for StandardisationLRFD load and resistance factor designMPI magnetic particle inspectionNDT non-destructive testing OS Offshore standardOSS Offshore service specificationRP recommended practiceSCF stress concentration factorWSD working stress design

Table E1 Abbreviations (Continued)Abbreviation In fullDET NORSKE VERITAS

Offshore Service Specification DNV-OSS-102, October 2003Page 16 Ch.1 Sec.2SECTION 2CLASSIFICATION PRINCIPLES

A. The Classification ConceptA 100 Introduction101 Classification is a comprehensive verification serviceproviding assurance that a set of requirements laid down inrules established by DNV are met during design and construc-tion, and maintained during operation of an offshore unit or in-stallation. Classification has gained world-wide recognition as represent-ing an adequate level of safety and quality. 102 Classification implies an activity, in which an offshoreunit or installation is surveyed during construction on the basisof design approval, tested before being taken into service, andsurveyed regularly during its whole operational life. The aim isto verify that the required safety standard is built-in, observedand maintained.103 Having assigned class, DNV will issue a classificationcertificate and enter the main particulars and details of class inthe Register of vessels classed with DNV.

A 200 Entering into force and application of rules201 Rules and amendments accepted by the Board will comeinto force when decided by the Board, normally six (6) monthsafter acceptance.202 The rules which are in force at the date of the written re-quest for classification, are the basis for the assignment andmaintenance of class.Subsequent amendments not made mandatory according to204 may be applied to objects under construction providedboth builder and owner agree to such application.203 In exceptional cases, where unacceptable service expe-rience and/or theoretical findings clearly show that safety haz-ards may arise in connection with items covered by the existingrules, DNV may lay down supplementary requirements tomaintain the overall safety standard reflected by the rules.204 DNV will consider alternatives found to represent anoverall safety standard equivalent to that of the rules. The al-ternative solution shall be adequately documented and will bereviewed for acceptance on the basis of relevant references setforth by DNV. Approval may be revoked if subsequent information indicatesthat the chosen alternative is not satisfactory.205 Upon request by the client, DNV may consider the useof other recognised codes and standards as part of the basis forclassification. Such agreed alternative arrangements shall bespecified in the class agreement.206 In cases where detailed requirements are not given in therules, specific solutions or decisions approved by DNV and itssurveyors shall be based on the principles of the rules, and shallgive a safety standard equivalent to that of the rules.207 Exceptionally, if for some reason, it is impossible tocomply with a rule requirement or to find a fully equivalent so-lution, then other solutions may be accepted by DNV, providedthe parties to the classification contract all agree and alwaysprovided that the overall safety level is not jeopardised. The al-ternative solution shall be adequately documented and will bereviewed for acceptance on the basis of relevant references setforth by DNV. The solution shall be recorded in the "Appendixto the Classification Certificate".208 In accordance with 204, DNV may consider the use of

class requirements. 209 Periodical survey regulations for retaining class in theoperational phase shall always be according to the current rulesin force at the time of survey (given in Ch.3).A 300 Basis for assignment of class301 Having assigned a specific class implies that DNV:

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

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

302 Prior to assigning class to an existing offshore object, itis in general to undergo all periodical surveys pertaining to theage and type of object.303 When assigning class to an offshore unit or installationwhich has not been built under supervision of DNV, but by an-other recognised classification society, DNV may on the basisof an overall safety consideration give exemptions from rulerequirements.304 When assigning class to offshore units or installationsbelonging to a series, where others are under construction toclass by another recognised classification society, DNV mayon the basis of an overall safety consideration give exemptionsfrom DNV rule requirements, and base the survey on the de-sign approval done by the other recognised society. The sameapplies for a design previously accepted by another recognisedsociety. A note to this effect may be included in the Appendixto the classification certificate.305 When assigning class to an offshore unit or installationregistered in a flag state that undertakes approval and surveysof items covered by the rules, DNV may accept their decisionsas basis for assigning class.306 DNV may also accept decisions by the national authori-ty with jurisdiction over the waters in which the unit or instal-lation is to operate (shelf state) as basis for assigning class.307 When other recognised codes or standards is used as ba-sis for assignment of class, an overall comparison with DNVrules shall be carried out to ensure that all aspects of safety arecovered by a defined code or standard.

A 400 Basis for maintenance of class401 The requirements for retention of class are found inSec.4 B. In addition, classification is based on the following: Valid statutory certificatesFor flagged units and installations the statutory certificates ofthe applicable international conventions shall be valid at alltimes, and the surveys prescribed in the conventions shall becarried out within the time windows prescribed.Maintenance of the unit or installation and its equipmentThe unit or installation, machinery installations and equipmentshall be maintained at a standard complying with the require-ments of the rules. Installed systems or equipment carried on board in excess ofthe rule requirements, but otherwise covered by the rules, shalleither be maintained in accordance with the rules, or be re-moved or disconnected in such a way as to ensure that the in-stalled system or equipment cannot be used.Handling of the unit or installationThe unit or installation, machinery installations and equipmentDET NORSKE VERITAS

reliability methods as a means of documenting compliance to shall be adequately manned and competently handled . Class

Offshore Service Specification DNV-OSS-102, October 2003Ch.1 Sec.2 Page 17conditions regarding the use of the unit shall be observed.Recording of lightweight and centre of gravityThe data for lightweight and centre of gravity (C.o.G.) shall becontinuously recorded and adjusted by the master for any itemstaken onboard or ashore during operation.

A 500 Documentation501 All information which may influence the judgement, de-cisions and requirements of DNV for the purpose of classifica-tion, shall be made available to DNV. It is the client'sresponsibility to ensure that such information is brought to theattention of DNV in a timely manner. Information may bemade available by submitting documents or by surveys per-formed at the clients premises, onboard or at the premises ofthe client's sub-contractors.502 The documentation forming the basis for classificationis, at all times, to reflect the true conditions. Revisions of doc-uments are therefore to be submitted to DNV to the extent suchrevisions may influence decisions and requirements relating toclass.

A 600 Disclosure of information601 DNV will not disclose any information received or re-ports made in connection with classification to any other thanthose entitled thereto or those having been given the right toreceive information by legislation, court decision or by writtenpermission from the owner.The supply of information may take place electronically andon a continual basis, e.g. by on-line access to DNV's databases.

Guidance note:Table A1 indicates which parties will be entitled to various kindsof information.

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602 DNV will not disclose information that can be consid-ered as the property of another party except when this party'spermission is given in writing.603 Internal communication, notes, calculations etc. pro-

duced within DNV in connection with classification will not bedisclosed to other parties.604 Notwithstanding 601 to 603, authorised representativesof the national maritime authorities or of the audit team ofIACS performing quality audits, will have access to such infor-mation. These representatives are to confirm in writing thatthey are not in any manner allowed to reproduce or communi-cate such information to other parties.605 Notwithstanding 601 and 603 DNV may disclose any in-formation to a police authority upon a written request by thesame.

A 700 Limitation of DNV's responsibility701 The classification service is performed on the basic as-sumption that other parties involved (building yard, designers,manufacturers, sub-contractors, owners, etc.) fulfil their indi-vidual obligations. The classification service is not performedin substitution of other parties' role or obligations. Nothingcontained herein or in any certificate, report or document is-sued in connection with or pursuant to these rules, shall relieveany designer, engineer, builder, manufacturer, yard, seller,supplier, owner, operator or other parties from any obligationsor consequences of default whatsoever. In particular, compli-ance with the rules does not imply acceptance or commission-ing of an offshore unit or installation. This is the exclusiveresponsibility of the owner. Any document issued by DNV in relation to surveys per-formed reflects the condition of the unit or installation at thetime of survey. It is the responsibility of the owner to maintainthe condition of the unit or installation as required by the rulesbetween surveys.

A 800 Vertical contract audits and audits by national maritime authorities801 For the purpose of conducting vertical audits performedby the audit team of IACS, and audits performed by the nation-al maritime authorities of the flag state, access shall be provid-ed to the unit or installation and/or to the premises ofmanufacturer or yard, as appropriate.

Table A1 Disclosure of information

Information in question Owner Flag Administra-tionPort State Au-

thorityInsurance Com-

pany * Yard or suppliers

Newbuildings:a) Approved "as carried out" structure

related drawings2) 1) 4)

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

2) 2) 2)

Units in operation:a) Class and statutory certificates issued

by DNV4) 1) 1) 3)

b) Survey and certificate status including text of conditions of class

4)

4)

1) 1) **

c) Survey reports 4) + 1) 1) 2) 3)Other information: Correspondence with yard or owner 2) 2) 2) 2)1) Upon request 2) When accepted by owner or yard and copyright holder as applicable3) When accepted by owner or through special clause in insurance contract4) Automatically available * Insurance company means P&I clubs and hull/structure & machinery underwriters DET NORSKE VERITAS

** Overdue conditions of class, only

Offshore Service Specification DNV-OSS-102, October 2003Page 18 Ch.1 Sec.3SECTION 3CLASSIFICATION SCOPE AND NOTATIONS

A. Scope of ClassificationA 100 General101 The rules and referred standards define acceptance crite-ria for design, construction, survey and testing of offshoreunits and installations, their marine, machinery and utility in-stallations, systems and equipment, applicable to the new-building and operational phase.

A 200 Rule parts201 The present offshore service specification states termsand procedures for assigning and maintaining class for produc-tion and storage units, as well as listing the applicable technicalreference documents stipulating technical requirements forclassification. These may be DNV offshore standards, otherDNV standards and internationally recognised codes.

A 300 Rule particulars301 These rules with reference standards give requirementsin the following areas:

B. Class NotationsB 100 General101 Classed units and installations will be given a class des-ignation consisting of:

construction symbol main character of class basic design notation service notation system and special facility notations (as applicable) special feature notations (as applicable).B 200 Construction symbols201 The symbol will be given to units and installationsbuilt under the supervision of DNV.202 The symbol will be given to units and installationsbuilt under the supervision of a recognised classification soci-ety and later assigned class with DNV.

B 300 Main character of class301 The notation 1A1 will be given to mobile offshore unitswith hull and marine machinery and equipment found to be incompliance with the basic (common) requirements of the ap-plicable DNV offshore standards referred to in the rules. 302 The notation OI will be given to non-selfpropelled off-shore installations intended for long term service at one off-shore location with main structure, utility and safety systemsfound to be in compliance with the basic (common) require-ments of the applicable DNV offshore standards referred to inthe rules.303 For OI main class there may be cases where the clientwishes to limit the scope of classification to selected areas anditems only. Such special class arrangements may be acceptableprovided it can be demonstrated that areas and items not cov-ered by classification have, or will be, designed, constructedand maintained to an appropriate recognised standard. The in-volvement by DNV will be specified in the class agreementand reflected in the class notations for the installation.

B 400 Basic design notations401 The basic design notation indicates the type of structure.The notations currently in use are given in Table B1.

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

Marine, machinery and utility installations and equipmentSystem installations and equipment, including their related auxiliary functions, with respect to strength and performance as applicable to the following functions: power generation propulsion (for 1A1 main class) steering (for 1A1 main class) fire and gas protection, detection and fire extinction drainage and bilge pumping ballasting anchoring and mooring hazardous area categorisation (if applicable).Other machinery installations, regardless of their contribution to the main functions stated above, when located in enclosed hull compartments.Other installations stated in the rules.

DET NORSKE VERITAS

Offshore Service Specification DNV-OSS-102, October 2003Ch.1 Sec.3 Page 19402 For types of objects not properly characterised by thelisted notations, the basic notations:

1A1 Mobile Offshore Unit OI Floating Offshore Installation

may be used.

B 500 Service notations501 Units or installations constructed according to DNVrules for offshore classification, arranged for a particular serv-ice and found to be in accordance with the relevant require-ments for such service, will be given a corresponding servicenotation.502 Service notations currently in use are defined in TableB2.

503 The service notations in Table B2 shall be consideredmandatory for the relevant types of units or installations.504 Classification services related to LNG/LPG productionand storage are presented in DNV-OSS-103.

B 600 System and special facility notations601 Units or installations having special facilities, systemsor equipment found to satisfy specified class requirements willbe given a corresponding class notation. Notations currently in

use are given in Table B3.Table B1 Basic design notationsBasic design notation Description

Ship-shaped Unit or Installation

Monohull ship and barge type units or in-stallations having displacement hulls with or without propulsion machinery.

Column-stabilised Unit or Installation

Unit or installation dependent on the buoyancy of widely spaced columns for floatation and stability for all modes of operation.

Self-elevating Unit or Installation

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

Deep Draught In-stallation

Floating structure having a relatively deep draught to obtain high heave eigenperiod avoiding resonance responses. A deep draught unit or installation can have single or multi-vertical columns, with or without moonpools.

Tension Leg Instal-lation

A buoyant installation connected to a fixed foundation by pre-tensioned ten-dons.

Table B2 Service notationsNotation DescriptionOil Production Unit or installation with production of hydrocar-

bons as a main functionOil Storage Unit or installation with storage of hydrocar-

bons as a main function

Table B3 Additional system and special facility notations

Notation *) DescriptionDYNPOS-AUTS Dynamic positioning system without redun-

dancyDYNPOS-AUT Dynamic positioning system with an inde-

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

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

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

BOW LOADING Bow loading arrangementCRANE Equipped with crane(s) DEICE or DEICE-C Unit equipped with de-icing or anti-icing

systemsDRILL Drilling plant E0 Unit equipped for unattended machinery

spaceECO Unit equipped for operation of machinery

from centralised control stationF-A Additional fire protection of accommoda-

tion spaceF-AM Additional fire protection of accommoda-

tion and machinery spaceF-M Additional fire protection of machinery

spaceF-C Additional fire protection of cargo spaceF-AC Additional fire protection of accommoda-

tion and cargo spaceF-MC Additional fire protection of machinery and

cargo spaceF-AMC Additional fire protection of accommoda-

tion, machinery and cargo spaceHELDK Helicopter deck structureHELDK-S Helicopter deck structure including safety

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

aspect related to the unit and to the helicop-ter

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

ing incorporating measurement of environ-mental conditions

ICE-L Strengthened for ice condition operationICS Unit equipped with integrated computer

systemOFFLOADING Hydro carbon offloading systemPOSMOOR Passive position mooring systemPOSMOOR-V Mooring system designed for positioning in

the vicinity of other structuresPOSMOOR-TA Thruster assisted mooring system depend-

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

ent on automatic remote thrust control sys-tem

PROD Hydrocarbon production plant SBM Unit with implemented management systemDET NORSKE VERITAS

Offshore Service Specification DNV-OSS-102, October 2003Page 20 Ch.1 Sec.3602 Ship-shaped units may also be assigned relevant classnotations given in the DNV Rules for Classification of Ships.

B 700 Special feature notations701 Special feature notations provide information regardingspecial design assumptions, arrangements or equipment whichare not covered by other class notations.702 Special feature notations currently in use are listed inTable B4.

B 800 Limitations of class801 When, under 303, the client for an OI classed installationwishes to limit the scope of classification to selected areas anditems only, the parts of the installation which are covered byclassification will be indicated in the classification certificate.The purpose of the notation Limitation of Class is to indi-cate such limitations, if applicable.Example:

Structure: Classification is limited to cover main struc-ture.

B 900 Compliance with shelf state legislation901 When DNV is requested to carry out verification in ac-cordance with shelf state regulations for the complete unit orinstallation or parts of the unit or installation, an additional no-tation may be assigned to the relevant class designations, con-sisting of the relevant country code and the issue of shelfregulations used as basis for verification in brackets, for exam-ple: PROD(N).902 Country code notations currently in use, are listed in Ta-ble B5.

903 For further information on procedures and scope of ver-ification for shelf requirements, see DNV offshore servicespecifications for shelf state compliance services listed in Ta-ble B5.

B 1000 Combination of notations1001 Class notations shall be combined as follows:

1A1 Unit Example:

1A1 Column-stabilised Production Unit POSMOOR SUB.

SPM Single point mooringSTL Submerged turret loadingVCS-1, VCS-2 or VCS-3

System for control of vapour emission from cargo tanks

*) For ship-shaped units intended to navigate or operate in waters with ice conditions, the class notations in accordance with Rules for Classification of Ships, Pt.5 Ch.1. may be assigned.

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

when resting on sea bed HOT (...C) Structures built for high temperature cargoCOAT-1 COAT-2

Specification of corrosion prevention in ballast tanks

TMON Tailshaft condition monitoring arrangement

Table B3 Additional system and special facility notations (Continued)Notation *) Description

Table B5 Notations for shelf state verificationBasic design notation DescriptionProduction Unit or In-stallation(N) Verified for compliance with DNVs

interpretation of relevant Norwegian shelf state requirements.

Storage Unit or Instal-lation(N)PROD(N)

UKVSVerified for compliance with DNVs interpretation of relevant UK shelf re-quirements according to DNV-OSS-202.

DET NORSKE VERITAS

Offshore Service Specification DNV-OSS-102, October 2003Ch.1 Sec.4 Page 21SECTION 4CLASSIFICATION PROCEDURE

A. Assignment of ClassA 100 Request for classification101 A request for classification shall be submitted in writingby the client.

A 200 Requirements for workshops and yards201 Builders shall operate a quality management system ap-plicable to the scope of their work. The system shall be docu-mented and contain descriptions and procedures for qualitycritical aspects.202 Builders unknown to DNV shall demonstrate their capa-bility to carry out fabrication of adequate quality in accordancewith the rules before construction is started.203 Builders shall maintain a traceable record of non-con-formities and corrective actions and make this available toDNV on request.

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

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204 Welding of important structures, machinery installationsand equipment shall be carried out by approved welders, withapproved welding consumables and at welding shops acceptedby DNV.205 During fabrication and construction work, DNV survey-ors shall have safe access to the works at all reasonable times,insofar as the