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OFFSHORE STANDARDDNVGL-OS-C401Edition July 2015Fabrication and testing of offshorestructuresThe electronic pdf version of this document found through http://www.dnvgl.com is the officially binding version.The documents are available free of charge in PDF format.DNV GL AS
FOREWORDDNV GL offshore standards contain technical requirements, principles and acceptance criteria related toclassification of offshore units. DNV GL AS July 2015Any comments may be sent by e-mail to rules@dnvgl.comThis 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 document.
GeneralThis document supersedes DNV-OS-C401, October 2014.Text affected by the main changes in this edition is highlighted in red colour. However, if the changesinvolve a whole chapter, section or sub-section, normally only the title will be in red colour.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 www.dnvgl.com. 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”.Main changes July 2015 GeneralThe revision of this document is part of the DNV GL merger, updating the previous DNV standard into a DNVGL format including updated nomenclature and document reference numbering, e.g.:— Main class identification 1A1 becomes 1A.— DNV replaced by DNV GL.— DNV-RP-A201 to DNVGL-CG-0168. A complete listing with updated reference numbers can be found onDNV GL's homepage on internet.To complete your understanding, observe that the entire DNV GL update process will be implementedsequentially. Hence, for some of the references, still the legacy DNV documents apply and are explicitlyindicated as such, e.g.: Rules for Ships has become DNV Rules for Ships.Editorial correctionsIn addition to the above stated main changes, editorial corrections may have been made.Offshore standard, DNVGL-OS-C401 – Edition July 2015Fabrication and testing of offshore structuresDNV GL ASPage 3Changes – currentCHANGES – CURRENT
CHANGES – CURRENT . 3CH. 1 INTRODUCTION . 7Sec.1Introduction . 71General .71.1 Introduction.71.2 Objective.71.3 Organisation of content .72Normative references .72.1 General .72.2 Offshore rules .72.3 Offshore standards .82.4 Other references .83Informative references .94Definitions .94.1 Verbal forms .94.2 Terms . 104.3 Abbreviations . 114.4 Latin symbols. 124.5 Greek symbols . 12CH. 2 TECHNICAL PROVISIONS . 13Sec.1Welding procedures and qualification of welders . 131Introduction .131.1 General . 131.2 Wide gap welding . 131.3 Welding processes . 132Welding procedures .132.1 General . 132.2 Preliminary welding procedure specification. 142.3 Welding procedure qualification test . 152.4 Welding procedure qualification record (WPQR) . 152.5 Welding procedure specifications (WPS). 153Welding procedure qualification, C-Mn steel and low alloy steel.163.1 Butt welds on plates. 163.2 Butt welds in pipes . 203.3 Full penetration T-, Y-, and K- joints . 213.4 Tubular joints/ Branch connections . 223.5 Fillet welds . 233.6 Validity of a WPS . 243.7 Fracture mechanics (FM) testing . 304Welding procedure qualification, aluminium .314.1 General . 314.2 Butt welds in plates . 324.3 Butt welds in pipes . 324.4 Branch connections. 334.5 Fillet welds . 334.6 Non-destructive testing of test assemblies . 334.7 Destructive testing. 34Offshore standard, DNVGL-OS-C401 – Edition July 2015Fabrication and testing of offshore structuresDNV GL ASPage 4ContentsCONTENTS
Sec.2Sec.3Sec.4Range of qualification . 35Retesting. 375Welding procedure qualification, stainless steel .375.1 General . 375.2 Additional requirements WPQT for austenitic stainless steel . 375.3 Additional requirements WPQT for ferritic-austenitic stainless steel(Duplex). 386Welding procedure qualification, copper alloys.386.1 Pipes, plates, castings and other product forms, not including propellercastings . 386.2 Copper alloy castings for propellers . 387Qualification of welders .407.1 General . 407.2 Standards for qualification testing . 408Testing .418.1 General . 418.2 Tensile testing at ambient temperature. 418.3 Bend testing . 41Fabrication and tolerances . 431General .431.1 Objective and scope. 432Fabrication planning .432.1 General . 432.2 Quality system and workmanship. 433Inspection .433.1 General . 434Material identification, cutting and forming .444.1 Material identification . 444.2 Cutting and forming . 445Tolerances .455.1 Tolerances for alignment and straightness . 456Assembly, welding, heat treatment and repairs.496.1 Assembly and welding . 496.2 Post weld heat treatment (PWHT) . 526.3 Repairs . 536.4 Flame straightening . 54Non-destructive testing. 551Scope.552Non-destructive testing (NDT).552.1 General . 552.2 NDT procedures . 552.3 Personnel qualification. 562.4 Extent of NDT . 562.5 Acceptance criteria for NDT . 59Other tests . 601Scope.602Testing of tightness .602.1 General . 60Offshore standard, DNVGL-OS-C401 – Edition July 2015Fabrication and testing of offshore structuresDNV GL ASPage 5Contents4.84.9
Sec.5Sec.6Structural tests.603.1 General . 60Corrosion protection systems. 621Scope.622Requirements .622.1 General . 622.2 Surface preparation and coating application . 622.3 Fabrication and installation of sacrificial anodes . 632.4 Fabrication and installation of impressed current cathodic protectionsystems . 63Miscellaneous. 641Scope.642Bolts .642.1 Bolts and nuts . 643Mechanical fastening .643.1 C
ISO 8502 Preparation of steel substrates before application of paints and related products -- Tests for the assessment of surface cleanliness ISO 8503 Preparation of steel substrates before application of paints and related products -- Surface roughness characteristics of blast-cleaned steel substrates ISO 9001 Quality management systems - Requirements ISO 9606 Approval testing of welders .
