Setting the Standard 648

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Setting the standardDNV Offshore Codes

Svein FlogelandProduct Manager, Offshore Class

DNV Technical seminar on Mobile Offshore UnitsMumbai, February 15th 2008



Version Slide 214 February 2008

What is classification?

Classification is a system for safeguarding life and propertyat sea, and the environment due to operationalconsequences

Classification implies a process of verifying offshore objectstowards a set of requirements which are laid down in theclssification rules

Classification may be regarded a quality system continuouslydeveloped for the maritime industry and accepted by:

- International bodies; IMO

- National authorities; flag states and shelf states

- Fabricators

- Owners

- Insurers

- Financiers




Design Approval or acceptancebased on alternative approaches

e.g. proven record, testing

Design Approval or acceptancebased on alternative approaches

e.g. proven record, testing

Survey programme

Survey programme

Periodical Surveys. In-service inspection programme

Periodical Surveys. In-service inspection programme

Safety

Principles

Safety

Principles

DESIGNPHILOSOPHY

DESIGNACCEPTANCE

OPERATION

RULES ANDINSTRUCTIONS

RULES ANDINSTRUCTIONS

THREATS

FROM-ENVIRONMENT-FUNCTIONAL LOADS-ACCIDENTAL LOADS

THREATSFROM-ENVIRONMENT-FUNCTIONAL LOADS-ACCIDENTAL LOADS

CONSTRUCTION

Classification process




Safety barriers related to design(four-line hazard defence)

Proper design andconstruction qualities toprovide a safe platform

Maintenance andinspection to sustainconstruction qualities

Safety after credibleaccidents such ascollision, fire, explosionor maloperation

Survivability after majoraccidents to provide a

safe haven throughadequate damagestability, floatability andlifesaving capability

Principles embedded in DNV Rules




Safety principles embedded in DNV Rules

Safety integrity for design loads- The unit or installation shall be designed and constructed with

sufficient integrity to withstand operational and environmental loading

throughout its lifecycle

Maintenance to sustain intended qualitied- Survey and follow-up in accordance with In-service Inspection

Program

Survivability for accidental loads- Systems and structures shall be designed with suitable functionality

and survivability for prevention of, or protection from, design accidentevents affecting the unit

Emergency evacuation- Effective escape, shelter and evacuation facilities shall be provided to

safeguard all personnel






Defence line philosophy

Defence lines or barrieres shall be established to ensure that

- Probabilities that failures or situations of hazards and

accidents will occur shall be kept an an acceptable level- Probabilities that such situations shall develop further shall

be reduced




DNV Offshore Publications Renewal ProjectDNV Offshore Publications Renewal Project

S e r v i c e S p e c i f i c a t

i o n s

O f f s h o r e S t a n d a r d s

R e c o m m e n d e d P r a c t i c e s

D e s i g n

C o n s t r u

c t i o

n

O p e r a t i o n

“Old” formal structure(up to1999)

New formal structure(from 2001)




DNV Offshore Codes:

3-level Document Hierarchy

Offshore Service Specifications:

– Principles and procedures for DNV offshore verification,classification, qualification and asset operation services

Offshore Standards:

- Technical provisions and acceptance criteria for general use by theoffshore industry as well as the technical basis for DNV offshore

services.

Recommended Practices:

- Proven technology and sound engineering practice as well as

detailed guidance for the higher level Offshore ServiceSpecifications and Offshore Standards.




DNV Offshore Codes:Formal Document Structure

OffshoreServiceSpecifications:

– Quality & Safety (A-series)

– Materials (B-series)

– Structures (C-series)

– Systems (D-series)

– Special Facilities (E-series)

– Pipelines & Risers (F-series) – Asset Operation (G-series)

– Marine Operations (H-series)

– Wind Turbines (J-series)

OffshoreStandards:

RecommendedPractices:

- Classification (100-series)

- Governmental Compliance (200-series)

- Risk Based Verification (300-series)

- Technology Qualification Management(400-series)

- Other Services (900-series)




DNV Offshore Codes - Global standards, practices and related services

covering many areas and aspects of offshore field development and operation

Pipeline:

OS-F101

RP-F101

RP-F104

RP-F105

RP-F106

RP-F107

RP-F108

Risers:

OS-F201

RP-F201

RP-F202

Wellheads:

OS-E101

Mooring:

OS-E301

SEMI-SUBSafety:

OS-A101

Materials:

OS-B101

Hull:

OS-C101

OS-C103

RP-C103OS-C-401

Stability:

OS-C301

Marine/Machinery:

OS-D101

Electrical:

OS-D201Instrumentation:

OS-D202

Fire Safety:

OS-D301

Production Plant:

OS-E201Drill Plant:

OS-E101

Helideck:

OS-E401

FPSOSafety:

OS-A101

Materials:

OS-B101

Hull:

OS-C101

OS-C102

RP-C102OS-C-401

Stability:

OS-C301

Marine/Machinery:

OS-D101

Electrical:

OS-D201Instrumentation:

OS-D202

Fire Safety:

OS-D301

FSO

Safety:

OS-A101

Materials:

OS-B101

Hull:

OS-C101

OS-C102RP-C102

OS-C-401

Stability:

OS-C301

Marine/Machinery:

OS-D101

Electrical:OS-D201

Instrumentation:

OS-D202

Fire Safety:

OS-D301

Anchors:

RP-E301RP-E302

Chain:

OS-E302

Wire rope:

OS-E303




Electronically available on Intranet and Internet

Paper documents for “traditional” distribution

CD-ROM

Publication methods




Service Specifications - Classification

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

DNV-OSS-102: Rules for Classification of Floating Production and Storage Units

DNV-OSS-103: Rules for Classification of LNG/LPG Floating Production and Storage Units or Installations

DNV-OSS-121: Classification using Performance Criteria determined By Risk Assessment Methodology

OFFSHORE SERVICE SPECIFICATION




Classification of Offshore Units and Installations

THREE MAIN PARTS:

Chapter 1: Principles and procedures for classification– Classification Principles, Scope and Notations, Procedure, Legal

Provisions

Chapter 2: Design and construction provisions– Design and Construction Requirements for Main Class

– Supplementary Requirements for Service Notations, e.g. ‘Drilling Unit’,‘Well Intervention Unit’

– Design and Construction Requirements for System and Special Facility

Notations, e.g. POSMOOR

Chapter 3: Operating provisions– Periodical Survey Requirements

DNV-OSS-101 / 102




Class Notations

Scope of classification is determined by mandatory and additionalclass notations , e.g.

1A1

Ship-shaped Oil Production and Storage Unit(N)

POSMOOR, ECO, CRANE, HELDK-SH, PROD(N)•Special

system and

equipmentnotations

Service and

type

notations

Main

character ofclass

Constructionsymbol




Classification of Drilling Units based on Offshore CodesClassification of Drilling Units based on Offshore Codes

DNV-OS-A101Arrangement

MaterialsDNV-OS-B101

Structural DesignDNV-OS-CXXX

Structural FabricationDNV-OS-C401

Stability & Watertight IntegrityDNV-OS-C301

Marine And Machinery SystemsDNV-OS-D101

Electrical Systems

DNV-OS-D201

InstrumentationDNV-OS-D202

Fire ProtectionDNV-OS-D301

Main Class

DrillingDNV-OS-E101

MooringDNV-OS-E301

HelideckDNV-OS-E401

DynposShip Rules Pt.6

Additional Class

DocumentationDNV-RP-A201DNV-RP-A202

Guidance

Classification SpecificationDNV-OSS-101




Design Approval

Requirements are given for

Safety principles and Arrangement

Material

Structural design

- Traditional Working Stress Method (WSD)

- Modern Load Resistance Factored Design (LRFD)

Stability and Watertight Integrity

Mooring and Towing

Marine Machinery Systems and equipment

Electrical Systems and Equipment

Instrumentation and Telecommunication Systems

Fire protection




Fabrication

Detailed requirements are given for

- Welding procedures

- Qualification of welders

- Fabrication and tolerances

- Testing of welds

- NDT requirements according to criticality: Special, primary andSecondary areas

- Other tests

- Corrosion protection system

Development for a more effective class-yard process:

- Integrating class survey programme with yards QA system by shiftingfocus from final “block inspection” towards correcting quality breachesin fabrication process




In-service surveys

Periodic surveys according to IACS requirements:Annual, Intermediate, Renewal Survey

Extent of visual, close visual and NDT of the loadbearing structure stated in the rules as well as inindividual In-service Inspection programs (IIP)

developed for each unit

Extent of survey decided on the basis of

- Unified IACS requirements- criticality considerations

- experience




DNV’s Offshore Codes– Widely used industry standards

Through the establishing of self-contained technical standards, DNVOffshore Standards and Recommended Practices have become widely

used technical reference standards for:

- Engineering companies

- Oil companies- Regulators

- Yards, Suppliers, Owners of offshore units




Offshore Class- Relationship to International Standards

DNV is an active Contributor to International Standardisation

DNV participate in more than 50 external standardisationcommittees, e.g. ISO, IEC, CEN, API

Principles applied in DNV Offshore Class:

- Increased use of internationally recognised standards as basis forclass

- Straightforward procedures for accepting alternative standards tothe ones listed as basis for class




Criteria for accepting a standard for Class:

Used widely in many parts of the world

Widely recognised as representing good practice

Regularly maintained up to date

Developed by a committee representing the principal industrytechnical stakeholders (e.g. owners, operators, regulators,

designers, manufacturers, certification bodies, academics)

Reviewed by DNV and found to represent an acceptableminimum level of safety

Offshore Classification




Documents

Setting the Standard 648