Requirements for the Fabrication of Class III Pipes (DNV-GL ...
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Class III pipes are used in low pressure and low temperature seawater systems on vessels. Think seawater systems, like cooling, ballast, ... ClassIIIpipesareusedinlowpressureandlowtemperatureseawatersystemsonvessels. Thinkseawatersystems,likecooling,ballast,BWTSandEGMS.SurveyorsneedtoknowalotofinformationandIhavenoted,onoccasion,surveyorsarenotfamiliarwithclassIIIpipefabricationrequirementsandattempttousetherequirementsforclassIandclassIIpipes.Thisisnotcorrectandwillraisecostsignificantly.BelowmaybehelpfulifyoueverneedtodiscusswiththesurveyortherequirementsforfabricationofclassIIIpipesandpressurevesselsbasedonDNV-GLRules. ThiswillbethesameforallIACSmembersocities.FirstletusconfirmthesepipesareinfactclassIIIpipes. Inaccordancewithtable2below,allpipesprovidedwereforaBWTSandthepressureisbelow16Barandthetemperatureisbelow200degreesC.Further,theseclassIIIpipeswillbeusedinaBWTSwheretheseawatertemperaturewillalwaysbebelow95degreesC.TherequirementsforclassIIIpressurevesselsareinTable4andthematerialrequirements. IRLwouldemphasize:1. ClassIIIpipeshaveNOREQUIREMENTFORANAPPROVEDPRESSUREEQUIPMENTMANUFACTURER2. ClassIIIpipeshaveNOREQUIREMENTFORANAPPROVEDMATERIALMANUFACTURER3. ClassIIIpipeshaveNOREQUIREMENTFORANAPPROVEDWELDINGPROCEDUREQUALIFICATION(Despitethis,IRLhassubmitourapplicableABSapprovedASMEIXweldingWPS,PQRandWQTS)4. Visualanddimensionalinspectionisrequiredandhasbeendone,inaccordancewithourmanufacturer’scertificates 5. EachpipewasindividuallyhydraulicallytestedpriortoPEliningatourfactoryinaccordancewiththeincludedhydraulictestingcertificatesandifthelocalsurveyorwishestoconductalocalhydraulictest,thesystemmaybepressurizedto1.5timesthesystempressuretofurthersatisfythisrequirement.FurtherSection7clarifiesfurtherthatONLYmanufacturersofpressureequipmentofclassIandclassII“shallbeapprovedbythesociety.” IRLDIDNOTPROVIDETHEOVERBOARDPIPEOUTBOARDOFTHEOVERBOARDVALVE. ThiswasnotwithinIRLscopeofsupply.Table7belowdetailsthecompliancedocumentsforclassIIIpipes. Forpipesandtubes,theMTRisissuedbythemanufacturerwhichisIRLinaccordancewithTable7.IRLhassatisfiedthisrequirement. Ourmanufacturer’scertificatesareissuedinaccordancewithABSrulessinceallourweldingprocedureshavebeenqualifiedbyABS,buttheseABSrulesmeetallDNV-GLrequirementsforclassIIIpipes.IRLhasprovided5.1BMTCswhichareequivalenttoISO104743:1MTCs. AlthoughGB/T18253-2018isnotspecificallyidentifiedintheDNV-GLRulesasarecognizedstandard,itisunlikelyDNV-GLwilltakeapositionthatGB/TstandardsarenotacceptabletoDNV-GLorDNV-GLwouldnotbeabletoworkinChina.TheequivalencyofaGB/T18253-20005.1BmillCerttoaISO10474MillCertisdocumentedinthebelowchartNA.1fromGB/T18253-2000 5 Like Comment Share Tovieworaddacomment,signin Tovieworaddacomment,signin WhatisPracticalEnvironmentalism? Mar11,2020 IRLwillbeatanyglobaldockyards'quoteforPElinedcarbonsteelpipeorIwillwireyouUSD250! Mar9,2020 PipeFitting101forMarineEngineers,Lesson2. Mar2,2020
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