Requirements for the Fabrication of Class III Pipes (DNV-GL ...
文章推薦指數: 80 %
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
延伸文章資訊
- 1DNV GL Approves New and Amended Rules for Classification ...
new and revised class notations; implementation of external requirements (IACS unified requiremen...
- 2DNV - Wikipedia
As a classification society, DNV sets standards for ships and offshore structures, known as Class...
- 3Requirements for the Fabrication of Class III Pipes (DNV-GL ...
Class III pipes are used in low pressure and low temperature seawater systems on vessels. Think s...
- 4DNV Standard for Certification 2.7-3 Portable Offshore Units
Standards for Certification also apply as the basis for the issue of certificates and/or declarat...
- 5Rules for classification of ships - July 2021 edition - DNV
Class notation, Rule reference DNV-RU-SHIP, Main topics. Container ships, Pt.5 Ch.2. cell guides ...