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Setting the standardDNV Offshore Codes
Svein FlogelandProduct Manager, Offshore Class
DNV Technical seminar on Mobile Offshore UnitsMumbai, February 15th 2008
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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
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Version Slide 314 February 2008
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
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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
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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
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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
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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)
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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.
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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)
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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
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Electronically available on Intranet and Internet
Paper documents for “traditional” distribution
CD-ROM
Publication methods
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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