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
- 1DNVGL-RU-SHIP-Pt1Ch1 General regulations - Rules and ...
DNV GL rules for classification contain procedural and technical requirements related to obtainin...
- 2DNVGL-ST-E273 2.7-3 Portable offshore units
— One additional Class R00 has been introduced to cover onshore, inshore and shipboard lifting. —...
- 3DNV - Wikipedia
DNV (formerly DNV GL) is an international accredited registrar and classification society ... set...
- 4DNV GL certification: what is it and why is it important?
Among the certification classes are: temperature class, vibration class, humidity class and IP pr...
- 5Class declaration - DNV
The trademarks DNV GL®, DNV®, the Horizon Graphic and Det Norske Veritas® are the properties of c...