Oss-101.pdf

OFFSHORE SERVICE SPECIFICATION

DET NORSKE VERITAS

DNV-OSS-101

RULES FOR CLASSIFICATION OF OFFSHORE DRILLING AND SUPPORT

UNITSAPRIL 2002

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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 Operation

DET NORSKE VERITAS

Offshore Service Specification DNV-OSS-101, April 2002Changes Page 3

CHANGES IN THE RULESThe present edition of the rules includes amendments and ad-ditions decided by the Board in December 2001 and super-sedes the January 2001 edition.The changes come into force 1 July 2002.These rules are valid until superseded by a revised version.Possible amendments between reprints will be published inDNV Offshore Codes Amendments and Corrections availableat http://www.dnv.com. Amendments and Corrections is nor-mally revised in April and October each year. When reprinted,revised rules will be forwarded to all subscribers to the rules.

Main changes

CHAPTER 1 PRINCIPLES AND PROCEDURES FORCLASSIFICATION

Sec.1 Introduction

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

Sec.2 Classification Principles

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

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

been added.

Sec.4 Classification Procedure

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

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

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

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

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

Item D401 has been amended regarding the conditions forreclassification.

CHAPTER 3 CLASSIFICATION IN OPERATION Sec.1 General Provisions for Periodical Surveys

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

Sec.2 Periodical Survey Extent for Main Class

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

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

APPENDIX A INTRODUCTION TO OFFSHORE CLASSIFICATION

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

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

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Offshore Service Specification DNV-OSS-101, April 2002Page 4 Changes

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Offshore Service Specification DNV-OSS-101, April 2002 Contents Page 5

CONTENTS

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

CH. 2 DESIGN AND CONSTRUCTION PROVISIONS 27

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

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

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

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

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

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

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

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

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Offshore Service Specification DNV-OSS-101, April 2002Page 6 Contents

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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Offshore Service Specification DNV-OSS-101, April 2002 Contents Page 7

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

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

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

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

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

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

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

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

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

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

Q. Management of Safety and Environmental Protection.........44Q 100 General............................................................................44Q 200 Technical requirements................................................... 44R. Special Feature Notations.....................................................44R 100 General............................................................................44R 200 Special feature notation SUB .........................................44R 300 Special feature notation NON-SELFPROPELLED.....44

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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Offshore Service Specification DNV-OSS-101, April 2002Page 8 Contents

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

DET NORSKE VERITASVeritasveien 1, N-1322 Hvik, Norway Tel.: +47 67 57 99 00 Fax: +47 67 57 99 11

OFFSHORE SERVICE SPECIFICATIONDNV-OSS-101

RULES FOR CLASSIFICATION OF OFFSHORE DRILLINGAND SUPPORT UNITS

CHAPTER 1

PRINCIPLES AND PROCEDURES FOR CLASSIFICATION

CONTENTS PAGE

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

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Offshore Service Specification DNV-OSS-101, April 2002Ch.1 Sec.1 Page 11

SECTION 1INTRODUCTION

A. IntroductionA 100 General101 This publication, DNV-OSS-101, presents DNVsRules for Classification of Offshore Drilling and SupportUnits, stating the terms and procedures for assigning andmaintaining classification, including listing of the applicabletechnical references to be applied for classification.

A 200 Organisation of DNV-OSS-101201 DNV-OSS-101 is divided into three main chapters asfollows:

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

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

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

A 300 Objects covered301 DNV-OSS-101 covers classification of offshore units ofthe following design types:

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

for the following services:

drilling well intervention accommodation heavy-lifting general offshore support.

B. DefinitionsB 100 Verbal forms101 Shall: Indicates requirements strictly to be followed inorder to conform to this service specification and from whichno deviation is permitted. 102 Should: Indicates that among several possibilities one isrecommended as particularly suitable, without mentioning orexcluding others, or that a certain course of action is preferredbut not necessarily required. Other possibilities may be appliedsubject to agreement.103 May: Verbal form used to indicate a course of actionpermissible within the limits of the service specification.

B 200 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, and an obligatory additional classnotation, e.g. Drilling Unit, where applicable. Voluntary additional class notations may also be assigned cov-ering special service, equipment or systems, e.g. DRILL de-noting a classed drilling plant.

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

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

statutory work carried out on behalf of national maritimeauthorities

equipment and materials.

210 Det Norske Veritas (DNV): An autonomous and inde-pendent foundation with the object of safeguarding life, prop-erty and the environment.211 Guidance note: Advice which is not mandatory for as-signment of class, but with which DNV, in light of general ex-perience, advises compliance. The client may decide whetherto apply the note or not.212 IACS: The International Association of ClassificationSocieties.213 IMO: The International Maritime Organization.214 International maritime standards: International IMOconventions, protocols, codes and resolutions, in so far as theirpurpose is safety and pollution prevention, excluding articlesand regulations dealing with intergovernmental relations, legaland formal aspects.215 LRFD methodology: Load and resistance factor designmethodology.216 Mobile offshore unit: A buoyant construction engaged inoffshore operations including drilling, production, storage orsupport functions, not intended for service at one particularoffshore location, and which can be relocated without majordismantling or modification.217 Offshore installation: A collective term to cover anyconstruction, buoyant or non-bouyant, designed and built forinstallation at a particular offshore location.218 Overall examination: An examination intended to reporton the overall condition of the structure. 219 Quality audit: A systematic and independent examina-tion to determine whether established work processes andquality systems are adhered to.220 Recognised classification society: A classification soci-

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Offshore Service Specification DNV-OSS-101, April 2002Page 12 Ch.1 Sec.1

ety which is a full or associate member of IACS. 221 The Rules: All rule requirements accepted by the Boardas basis for classification. 222 The Society: Signifies DNV.223 Statutory certificates: IMO convention certificates is-sued on behalf of, or by, national authorities.224 Supplier or manufacturer: Supplies materials, compo-nents, equipment and systems to newbuildings to be classed, orto classed units in operation, whose production is subject to de-sign approval, surveys and testing in accordance with the rules. 225 Tentative rules and standards: Apply to new fields towhich DNV reserves the right to make adjustments during aperiod in order to obtain the purpose intended.226 Vertical contract audit: An IACS audit which assessesthe correct application of the quality system through audit ofthe process for a specific contract. The IACS QSCS (QualitySystem Certification Scheme) audit team is responsible forcarrying out these audits.227 WSD methodology: Working stress design methodolo-gy.

C. Normative ReferencesC 100 Normative references101 DNV-OSS-101 includes references to other DNV docu-ments and recognised codes and standards which shall be usedin conjunction with the requirements given in this documentfor assignment of class.

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

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

D. Informative ReferencesD 100 DNV informative references101 The publications listed in Table D1 are referenced in thetext of this document, and may be used as a source of supple-mentary services and information.102 The latest revision of the documents listed in Table D1applies.

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

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

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

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

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

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

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

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

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

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

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

Regulations Standard for Certification 1.2

Type Approval

Classification Note 72.1

Allowable Thickness Diminution for Hull Structures

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

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

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

PD 5500(PreviousBS 5500)

Specification for unfired fusion welded pressure vessels

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

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

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

Table E1 Abbreviations (Continued)Abbreviation In full

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SECTION 2CLASSIFICATION PRINCIPLES

A. The Classification 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. Classification has gained world-wide recognition as represent-ing an adequate level of safety and quality. 102 Classification implies an activity, in which an offshoreunit is surveyed during construction on the basis of design ap-proval, tested before being taken into service, and surveyedregularly during its whole operational life. The aim is to verifythat the required safety standard is built in, observed and main-tained.103 Having assigned class, DNV will issue a classificationcertificate and enter the main particulars and details of class inthe Register of vessels classed with DNV.

A 200 Entering into force and application of rules201 Rules and amendments accepted by the Board will comeinto force when decided by the Board, normally six (6) monthsafter acceptance.202 The rules which are in force at the date of the written re-quest for classification, are the basis for the assignment andmaintenance of class.Subsequent amendments not made mandatory according to204 may be applied to objects under construction providedboth builder and owner agree to such application.203 In exceptional cases, where unacceptable service expe-rience and/or theoretical findings clearly show that safety haz-ards may arise in connection with items covered by the existingrules, DNV may lay down supplementary requirements tomaintain the overall safety standard reflected by the rules.204 DNV will consider alternatives found to represent anoverall safety standard equivalent to that of the rules. Approvalmay be revoked if subsequent information indicates that thechosen alternative is not satisfactory.205 In cases where detailed requirements are not given in therules, specific solutions or decisions approved by DNV and itssurveyors shall be based on the principles of the rules, and shallgive a safety standard equivalent to that of the rules.206 In accordance with 204, DNV may consider the use ofreliability methods as a means of documenting compliance toclass requirements.

A 300 Basis for assignment of 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 which has notbeen built under supervision of DNV, but by another recog-nised classification society, DNV may on the basis of an over-all safety consideration give exemptions from rulerequirements.

304 When assigning class to offshore units belonging to a se-ries, where others are under construction to class by anotherrecognised classification society, DNV may on the basis of anoverall safety consideration give exemptions from DNV rulerequirements, and base the survey on the design approval doneby the other recognised society. The same applies for a designpreviously accepted by another recognised society. A note tothis effect may be included in the Appendix to the classifica-tion certificate.305 When assigning class to an offshore unit registered in aflag state that undertakes approval and surveys of items cov-ered by the rules, DNV may accept their decisions as basis ofassigning class.306 DNV may also accept decisions by the national authori-ty with jurisdiction over the waters in which the unit or instal-lation is to operate (shelf state) as basis for assigning class.A 400 Basis for maintenance of class401 The requirements for retention of class are found inSec.4 B. In addition, classification is based on the followingassumptions:

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

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

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

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

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

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ports made in connection with classification to any other thanthose entitled thereto or those having been given the right toreceive information by legislation, court decision or by writtenpermission by the owner.The supply of information may take place electronically andon a continual basis, e.g. by on-line access to DNV's databases.

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

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

A 800 Vertical contract audits and audits by national maritime 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 and/or to the premises of manufacturer or yard,as appropriate.

Table A1 Disclosure of information

Information in question Owner Flag Administra-tionPort State Authority

Insurance Company * Yard or suppliers

Newbuildings:a) Approved "as carried out" structure

related drawings 2) 1) 4)b) Approved "as carried out" system

and component drawings 2) 2) 2)Units in operation:a) Class and statutory certificates is-

sued by DNV 4) 1) 1) 3)b) Survey and certificate status in-

cluding text of conditions of class 4) 4) 1) 1)**c) Survey reports 4) + 1) 1) 2) 3)Other information: Correspondence with yard or owner 2) 2) 2) 2)1) Upon request 2) When accepted by owner or yard and copyright holder as 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 ** Overdue conditions of class, only

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SECTION 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, their marine and machinery installations, systems andequipment, applicable to the newbuilding and operationalphase.

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

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

B. Class NotationsB 100 General101 Classed units will be given a class designation consist-ing of:

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

B 300 Main character of class301 The notation 1A1 will be given to units with hull andmarine machinery and equipment found to be in compliancewith the basic (common) requirements of the applicable DNVoffshore standards referred to in the rules.

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

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

1A1 Mobile Offshore Unitmay be used.

B 500 Service notations501 Units constructed according to DNV rules for offshoreclassification, arranged for a particular service and found to bein accordance with the relevant requirements for such service,will be given a corresponding service notation.502 Service notations currently in use are defined in TableB2.

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

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

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

for:

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

pressed gases where:pV 150 kNmp = design pressure in kN/m2V = pressure vessel volume in m3

firing and combustion installations other installations stated in the rules.

Table B1 Basic design notationsBasic design notation Description

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

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

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

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503 The service notations in Table B2 shall be consideredmandatory for the relevant types of units.504 Classification services related to hydrocarbon produc-tion and storage are presented in separate rules, DNV-OSS-102.

B 600 System and special facility notations601 Units having special facilities, systems or equipmentfound to satisfy specified class requirements will be given acorresponding class notation. Notations currently in use aregiven in Table B3.

B 700 Special feature 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 Service restrictions801 Units not approved for unrestricted service will have rel-evant service restrictions stated in the Appendix to the classi-fication certificate. These units will be given the classnotation R to indicate that restrictions apply.The notation R will be inserted after the main character ofclass. 802 Other service restrictions or operational limits includedin the design assumptions of a unit will be stated in the Ap-pendix to the classification certificate, and/or on special sign-boards onboard.803 Service restrictions and deviations from the rule require-ments shall be addressed in a memo for owners (MO) inform-ing them about the assumption for the class notation if the unitshall be operated outside the geographical areas or otherboundaries agreed in the classification contract.

B 900 Compliance with shelf state legislation901 When DNV is requested to carry out verification in ac-cordance with shelf state regulations for the complete unit orparts of the unit, an additional notation may be assigned to therelevant class designations, consisting of the relevant shelfstate code and the issue of shelf state regulations used as basisfor verification in brackets, e.g.:DRILL(N).

Table B2 Service notationsNotation DescriptionDrilling Unit with drilling as a main functionWell Intervention Unit with well intervention as a main function

Accommodation Units primarily used for accommodation purposes

Crane Units primarily used for heavy-lift pur-poses

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

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

Unit equipped with de-icing or anti-icing systems

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

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

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

ational limitationsDYNPOS-AUTS Dynamic positioning system without redun-

dancyDYNPOS-AUT Dynamic positioning system with an inde-

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

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

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

E0 Unit equipped for unattended machinery space

ECO Unit equipped for operation of machinery from centralised control station

F-A Additional fire protection of accommoda-tion space

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

F-M Additional fire protection of machinery space

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

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

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

HELDK Helicopter deck structureHELDK-S Helicopter deck structure including safety

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

aspect related to the unit and to the helicop-ter

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

ing incorporating measurement of environ-mental conditions

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

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

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

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

ent on automatic remote thrust control sys-tem

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

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

ation when resting on sea bed NON-SELFPRO-PELLED

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

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

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

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

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

1A1 Unit Example:

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

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

Verified for compliance with DNVs in-terpretation of relevant Norwegian shelf state requirements.

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

terpretation of relevant UK shelf state re-quirements.

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SECTION 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.


204 Welding of important structures, machinery installationsand equipment shall be carried out by approved welders, withapproved welding consumables and at welding shops acceptedby DNV.205 During fabrication and construction work, DNV survey-ors shall have safe access to the works at all reasonable times,insofar as the work affects classification. The client shall en-sure, through contracts with the parties concerned or other-wise, that such access is possible, and that DNV is notified asto when and where the surveyor's attendance is needed.

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

subcontractors if applicable.

A 400 Requirements for manufacturers401 Manufacturers of materials, components and equipmentfor main class shall be approved according to criteria estab-lished by DNV, as applicable.402 Any required quality control of materials, componentsand equipment, shall be traceable and documented in writing.Further, quality control shall be carried out by qualified per-sonnel at facilities and with equipment suitable for that control.

A 500 Requirements for suppliers of services501 Firms providing services on behalf of the owner, such asmeasurements, tests and maintenance of safety systems andequipment, where the results may form the basis for the sur-veyor's decisions, shall be approved by DNV.Where surveyors use such services in making decisions affect-ing statutory certifications, the suppliers are subject to approv-al by DNV in cases where DNV is authorised by the relevantadministration to do so. For such services DNV may accept ap-provals done by the administration, or duly authorised organi-

sations acting on behalf of the administration.

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

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


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

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

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

Any documents submitted for re-approval shall be especiallymarked to identify the revised parts.The builder, with which DNV has the classification contract, isresponsible for co-ordinating that drawings and other docu-ments are submitted, and for distributing any approval com-ments that may have been given.702 When a unit, which is not built under supervision ofDNV, shall be classified, the information required in 701 shall,in general, be submitted for approval. The extent of documen-tation approval for a unit, which is classed, or which was pre-viously classed, with another recognised classification society,will be decided upon in each case.703 Documentation that has been found to comply with therule requirements will be provided with a statement of approv-al. Conditions and limitations of the approval will be stated asagreed in the classification contract.704 The approval may be revoked at any time if subsequentinformation indicates that the design solution was contrary tothe rule requirements or intentions.705 The English language shall be used in drawings andspecifications submitted for approval. The possibility of usingthe local language shall be agreed upon in each case.706 When drawings and documents are submitted as elec-tronic files, the format and transfer method shall be agreedupon in each case.

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

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

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

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

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

Supervision will be carried out at the building yard and/or thesub-suppliers at the discretion of DNV, which also decides theextent and method of control.802 The verification method applied by DNV at the buildingyard or at the manufacturers will be based on a combination ofaudits of an accepted quality system and visual inspections andtests.803 When a unit, which has not been built under the supervi-sion of DNV, shall be classified, DNV will carry out surveysto confirm:

that the design and dimensions comply with the approveddocumentation

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

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

Functional tests will be carried out as deemed necessary byDNV.804 For units built under the supervision of another recog-nised society the requirements of 803 will normally be consid-ered as complied with for the main class.805 When an existing unit is to be classified, it is in generalto undergo all periodical surveys pertaining to the age and typeof unit. The extent of surveys will be decided by DNV in each separatecase.

A 900 Functional testing901 A test programme shall be prepared by the builder. Theprogramme shall specify systems and components to be tested,and the testing procedure. The programme shall include sea tri-als with machinery and equipment installed (as applicable).902 The tests shall give evidence of satisfactory operation inaccordance with the rules. When testing the control and safetysystem, failure modes shall be simulated as realistically as pos-sible.903 Unless otherwise agreed, the testing required by therules shall be carried out in the presence of a surveyor. Datashall be recorded according to the test programs and as consid-ered necessary by the surveyor.

A 1000 Certification of materials, components and sys-tems1001 The scope of classification includes certification of ma-terials, components and systems intended for the unit. Therules define the extent of the certification that is needed forclassification. The objective of the certification is to ensurethat materials, components and systems used in units to beclassed by DNV conform to the rules and referenced standardswithin the framework of the rules.The certification is a conformity assessment normally includ-ing both design and production assessment.The production assessment includes inspection and testingduring production and/or of the final product.1002 The design assessment of the materials, componentsand systems shall either be on a case by case basis or followthe procedure for type approval.1003 When the case by case procedure is used, documen-tation of the design shall be submitted for assessment for everyapplication as required in the rules. A design assessment letteror design verification report shall be issued by DNV whencompliance with the requirements for the design for the actualapplication is confirmed.

1004 When the type approval procedure is used, documenta-tion of the design and the results of type testing as required intype approval programmes and the rules, shall be submitted forassessment. A type approval certificate shall be issued byDNV when compliance with the requirements for the design isconfirmed. The type approval certificate has a validity of 2 or4 years depending on type of material, component and system.1005 The production assessment of materials, componentsand systems shall either be on a case by case basis or on thebasis of an agreed Manufacturing Survey Arrangement(MSA).1006 When the case by case procedure is used, the surveyand testing shall be performed on the basis of approved designdocumentation for the actual application and as required in therules. Compliance with the approved design documentationand the requirements shall be documented through certificatesas required in the rules.1007 When the production assessment is based on an MSA,the survey and testing shall be performed on the basis of ap-proved design documentation and in accordance with require-ments and procedures laid down in the MSA. Compliance withthe approved design documentation and the requirements shallbe documented through certificates as specified in the MSA oras required in the rules.1008 Certification of materials, components and systemsshall be documented by the following types of documents:

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

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

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

in accordance with special agreements.

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

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

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

partment of the manufacturers.

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

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

production.

The applicable rules or standards will specify which of theabove mentioned documentation will be required.1009 Where the rules require Works certificate (W) or Testreport (TR), the surveyor may at any time require tests to becarried out in his presence and/or check elements of the qualitycontrol in operation.1010 For identification and traceability, certified productsshall be stamped in accordance with the marking given in theproduct certificate and as specified by the applicable rules orstandards.1011 For certain components and systems as defined in therules, the certification may be based on defined internationallyrecognised standards and certification schemes that cover theoverall quality, safety and environmental standard of the rules.Compliance with the requirements of the standard shall be doc-umented as required by the standard.

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1012 To ensure an efficient, cost effective and correct certi-fication process, a general certification agreement is normallyto be established with manufacturers delivering NV certifiedproducts.The general certification agreement may be part of a manufac-turing survey arrangement (MSA).The general certification agreement shall include informationon the procedures for design and p

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