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DNVGL-OS-C201: Structural design of offshore units - WSD ...

offshore STANDARDDNV GL ASThe electronic pdf version of this document found through is the officially binding version. The documents are available free of charge in PDF July 2015 Structural design of offshore units - WSD method DNV GL AS July 2015 Any comments may be sent by e-mail to service document has been prepared based on available knowledge, technology and/or information at the time of issuance of this document. The use of thisdocument by others than DNV GL is at the user's sole risk. DNV GL does not accept any liability or responsibility for loss or damages resulting from any use ofthis GL offshore standards contain technical requirements, principles and acceptance criteria related toclassification of offshore standard, DNVGL-OS-C201 Edition July 2015 Page 3 Structural design of offshore units - WSD methodDNV GL AS Changes currentCHANGES CURRENT GeneralThis document supersedes DNV-OS-C201, October affected by the main changes in this edition is highlighted in red colour.

— [2.2] A clearer definition of structural categories has been provided. — [2.3.5]: Special considerations have been added for casting material. — [2.4]: Design temperature definition to be aligned with other OS has been updated. — [3.2.1]: Better definition of class scope with respect to temporary phases has been provided.

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Transcription of DNVGL-OS-C201: Structural design of offshore units - WSD ...

1 offshore STANDARDDNV GL ASThe electronic pdf version of this document found through is the officially binding version. The documents are available free of charge in PDF July 2015 Structural design of offshore units - WSD method DNV GL AS July 2015 Any comments may be sent by e-mail to service document has been prepared based on available knowledge, technology and/or information at the time of issuance of this document. The use of thisdocument by others than DNV GL is at the user's sole risk. DNV GL does not accept any liability or responsibility for loss or damages resulting from any use ofthis GL offshore standards contain technical requirements, principles and acceptance criteria related toclassification of offshore standard, DNVGL-OS-C201 Edition July 2015 Page 3 Structural design of offshore units - WSD methodDNV GL AS Changes currentCHANGES CURRENT GeneralThis document supersedes DNV-OS-C201, October affected by the main changes in this edition is highlighted in red colour.

2 However, if the changes On 12 September 2013, DNV and GL merged to form DNV GL Group. On 25 November 2013 Det NorskeVeritas AS became the 100% shareholder of Germanischer Lloyd SE, the parent company of the GL Group,and on 27 November 2013 Det Norske Veritas AS, company registration number 945 748 931, changed itsname to DNV GL AS. For further information, see Any reference in this document to DetNorske Veritas AS , Det Norske Veritas , DNV , GL , Germanischer Lloyd SE , GL Group or any otherlegal entity name or trading name presently owned by the DNV GL Group shall therefore also be considereda reference to DNV GL AS .involve a whole chapter, section or sub-section, normally only the title will be in red changes July 2015 General The document has been updated to reflect and align with all updates in DNV-OS-C105, Structural design of Tension Leg Platforms (LRFD method).

3 Fatigue Acceptance criteria for scantling check under overflow tank pressure have been revised. Special considerations for tension leg platforms (TLP) [ ]: A reference to API-RP-2T has been added. [ ]: Functional requirements for tendons have been updated [ ] A clearer definition of Structural categories has been provided. [ ]: Special considerations have been added for casting material. [ ]: design temperature definition to be aligned with other OS has been updated. [ ]: Better definition of class scope with respect to temporary phases has been provided. [ ]: Considerations/guidance notes for tendon fabrication have been added. [ ]: Considerations have been added for VIV/VIM and tendon buckling during tendon free standing phase.

4 [ ]: Removal of previous clause [ ] on settlement or subsidence. [ ]: Better definition of tendon design principal, Guidance note has been added to explain 'fail proof' philosophy. [ ]: design principles for foundation have been added. [ ]: design principles for systems have been added - special consideration for TLP application. [ ]: design principles for simultaneous operations have been added. [ ]: Guidance note has been added with regards to minimum sea pressure. [ ]: Acceptance criteria for scantling check under overflow tank pressure have been revised. [ ]: Definition of design conditions to be considered has been clarified. [ ]: New clause referring to DNVGL-OS-C301 has been added. [ ]: Guidance note has been added with regards to inclining test requirement for TLP.

5 [ ]: Guidance note has been added with regards to design wave selection for TLP. [ ]: A new clause on deck vibration has been added. [ ]: Airgap requirement has been updated to be in line with DNVGL-OS-C105. [ ]: Reference has been added for requirements with respect to scantling and weld connections. [ ]: Acceptance criteria for temporary loss in tendon tension has been added to be in line with OS-C105. offshore standard, DNVGL-OS-C201 Edition July 2015 Page 4 Structural design of offshore units - WSD methodDNV GL AS Changes current [ ]: Foundation design section has been updated with more detailed requirements. [ ]: Guidance note on fracture toughness has been updated to be in line with DNVGL-OS-C105.

6 [ ]: Requirements and guidance note on maximum allowable flaw size and NDT method have been updated to be in line with DNVGL-OS-C105. [ ]: Requirement with regards to pile fatigue damage due to pile driving has been added. [ ]: Guidance note has been added with regards to ballast system capacity. [ ]: A clearer definition has been provided with respect to accidental loads required in the design . [ ]: Requirement of analysis to evaluate consequence of tendon failure has been deleted. [ ]: Requirements for tendon tension in accidental condition has been added to be in line with OS-C105. Certification of tendon system [ ]: List of acceptable standards has been deleted and reference is made to Tables 1-1 and 1-2.

7 [4]: Definition of IRN has been deleted because this is no longer issued; certification for sub-components has been clarified. [5]: Previous sub-section [ ] on Foundation has been deleted; relevant requirements have been moved to relevant sections in [ ]: Further completed with regard to welding requirements and acceptance criteria. Guidance note has been updated to clarify requirements for line pipes. [ ]: Some requirements for tendon tension monitoring system (TTMS) that were accidentally deleted have been reinstated. [ ]: Acceptance criteria for tendon porch have been added. [ ]: Requirements for load management program (LMP) have been further clarified. [6]: Categorization of tendon components, sub-components and their certificate requirements has been clarified.

8 [ ]: Guidance note has been added with regards to level of NDT for tendon addition to the above stated main changes, editorial corrections may have been correctionsOffshore standard, DNVGL-OS-C201 Edition July 2015 Page 5 Structural design of offshore units - WSD methodDNV GL AS ContentsCONTENTSCHANGES CURRENT .. 3CH. 1 INTRODUCTION .. 151 General .. and application .. than DNV GL codes .. 162 .. 163 Definitions .. forms .. 184 Abbreviations and symbols .. 23CH. 2 TECHNICAL PROVISIONS .. 261 Introduction .. of the design .. 262 General design considerations .. design .. design .. 273 design conditions .. 274 Loading .. 285 design by the WSD method.

9 Stress and usage factors .. usage factors .. 296 design assisted by testing .. testing and observation of performance of existing structures .. and load 301 Introduction .. 302 Basis for selection of loads .. 303 Permanent functional loads .. 31 offshore standard, DNVGL-OS-C201 Edition July 2015 Page 6 Structural design of offshore units - WSD methodDNV GL AS Contents4 Variable functional loads .. functional loads on deck 325 Environmental loads .. conditions for mobile units .. conditions for site specific units .. of hydrodynamic loads .. induced inertia forces .. induced oscillations .. Water level and tidal effects .. Marine Snow and ice accumulation.

10 Direct ice load .. Earthquake .. 376 Combination of environmental loads .. 387 Accidental .. 388 Deformation loads .. and subsidence of sea bed .. 399 Fatigue loads .. 3910 Load effect analysis .. General .. Global motion analysis .. Load effects in structures and soil or foundation .. categorisation, material selection and inspection principles .. 421 General ..422 Temperatures for selection of material .. units .. fixed units .. 423 Structural .. of Structural category .. of welds .. 434 Structural steel .. designations .. of Structural mechanics (FM) testing .. weld heat treatment (PWHT) .. 47 offshore standard, DNVGL-OS-C201 Edition July 2015 Page 7 Structural design of offshore units - WSD methodDNV GL AS 481 General.


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