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【船级社】 DNV Repair guidance for vessels in operation 2020-09.pdf
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【船级社】 DNV Repair guidance for vessels in operation 2020-09.pdf
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CLASS GUIDELINE
DNVGL-CG-0456 EditionSeptember2020
Repairguidanceforvesselsinoperation
ThecontentofthisservicedocumentisthesubjectofintellectualpropertyrightsreservedbyDNVGLAS("DNVGL").Theuser
acceptsthatitisprohibitedbyanyoneelsebutDNVGLand/oritslicenseestoofferand/orperformclassification,certification
and/orverificationservices,includingtheissuanceofcertificatesand/ordeclarationsofconformity,whollyorpartly,onthe
basisofand/orpursuanttothisdocumentwhetherfreeofchargeorchargeable,withoutDNVGL'spriorwrittenconsent.
DNVGLisnotresponsiblefortheconsequencesarisingfromanyuseofthisdocumentbyothers.
TheelectronicPDFversionofthisdocument,availableattheDNVGLwebsitednvgl.com,istheofficial,bindingversion.
DNVGLAS
FOREWORD
DNVGLclassguidelinescontainmethods,technicalrequirements,principlesandacceptance
criteriarelatedtoclassedobjectsasreferredtofromtherules.
©
DNVGLASSeptember2020
Anycommentsmaybesentbye-mailto[email protected]
Thisservicedocumenthasbeenpreparedbasedonavailableknowledge,technologyand/orinformationatthetimeofissuanceofthis
document.TheuseofthisdocumentbyothersthanDNVGLisattheuser'ssolerisk.Unlessotherwisestatedinanapplicablecontract,
orfollowingfrommandatorylaw,theliabilityofDNVGLAS,itsparentcompaniesandsubsidiariesaswellastheirofficers,directorsand
employees("DNVGL")forprovedlossordamagearisingfromorinconnectionwithanyactoromissionofDNVGL,whetherincontractorin
tort(includingnegligence),shallbelimitedtodirectlossesandunderanycircumstancebelimitedto300,000USD.
CHANGES–CURRENT
Thisisanewdocument.
Changes-current
Classguideline—DNVGL-CG-0456.EditionSeptember2020 Page3
Repairguidanceforvesselsinoperation
DNVGLAS
CONTENTS
Changes–current.................................................................................................. 3
Section1General....................................................................................................5
1General................................................................................................ 5
Section2Damageandrepairprocess-generalprinciples..................................... 8
1Owner’sobligations............................................................................. 8
2Damageandrepairsurveyfollowup...................................................8
3Planningarepair............................................................................... 11
4Surveyofrepair.................................................................................13
Section3Majorconditions-criticaldamagerequiringpromptandthorough
repair.................................................................................................................... 14
1General.............................................................................................. 14
2Hullstructures...................................................................................14
3Machineryandsystems..................................................................... 14
4Statutoryrelatedequipment..............................................................14
Section4Underwaterandin-waterrepairs.......................................................... 15
1Dryweldingonhullwithwateronoppositeside...............................15
2Underwaterwetwelding................................................................... 15
3In-waternon-destructivetesting–magneticparticletesting............ 15
Section5Pressurevessels....................................................................................17
1General.............................................................................................. 17
2Repairguidance.................................................................................17
3Prefabricatedelements......................................................................17
4Postweldheattreatment.................................................................. 17
5Non-destructivetesting..................................................................... 17
6Hydrostatictesting............................................................................ 18
Section6Repairbybuild-upbymetalcoatingandcladwelding.......................... 19
1General.............................................................................................. 19
2Repairbybuild-upbymetalcoatingandcladwelding.......................19
3Qualificationforthermalspraying..................................................... 19
Changes–historic................................................................................................20
Contents
Classguideline—DNVGL-CG-0456.EditionSeptember2020 Page4
Repairguidanceforvesselsinoperation
DNVGLAS
SECTION1GENERAL
1General
1.1Objective
Theobjectiveofthisclassguideline(CG)istohighlighttheprinciplesandprovideguidanceforplanningand
handlingofrepairsofdamagesanddefectsforvesselsinoperation,classedbytheSociety.
1.2Scope
Theclassguidelinewilldetailtheprinciplesforthedamageandrepairfollowupprocess:
— communicationwiththeSociety
— surveyfollowup
— certificationandreplacementofcomponentsandmaterial
— requirementsforworkmanship
— preparationoftherepairplanspromptandthoroughrepair
— promptandthoroughrepair.
Italsoincludesdescriptionofselectedrepairrelatedmethodsandtestingforvesselsinoperation.
1.3Application
TheseguidelinesareapplicabletoallvesselsclassedwiththeSociety.
1.4References
Forrelevantrulereferences,seeTable1.RelevantIACSdocumentsarelistedinTable2.Rulereference
forotherregimesthanDNVGLrulesforclassificationofshipsmaynothavebeenmentionedinthisclass
guideline,buttherespectiverulesandregulationsshallneverthelessbeappliedasrelevant.
Table1DNVGLdocuments
Documentcode Title
DNVGL-RU-SHIPPt.1Ch.1 Generalregulations
DNVGL-RU-SHIPPt.7Ch.1 Surveyrequirementsforfleetinservice
DNVGL-CG-0044 Metalcoatingandcladwelding
DNVGL-CG-0182 Allowablethicknessdiminutionforhullstructure
DNVGL-CG-0051 Non-destructivetesting
DNVGL-CP-0484App.B[14] Servicesuppliersengagedinalignmentofpropulsionshaftingandinstallationofrotating
machinery
DNVGL-CG-0550 Maritimeservices
Section1
Classguideline—DNVGL-CG-0456.EditionSeptember2020 Page5
Repairguidanceforvesselsinoperation
DNVGLAS
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