Piping Walkdown Inspection管道巡检概述

PipingWalkdown

CourseObjectivesExplainwhat,who,whenandhowProvideguidanceandhandoutnecessaryinfoShowexamplesofpunchitemsShowaspectsofthePEFSShowaspectsofvalvesEncouragecriticalquestionsMajorConcernsPaintingunderneathinsulationfrom–160uptoandincluding+150above150lessaproblemifcontinuousabove150FlangeconnectionsBolts,nutsandgasketandtightnessoftheconnectionColdinsulationpipingoperatingbelowdewpointandtobekeptcool)Damagetothemultiplexwhenmetalcladdingisused.InsulationgeneralSealingofmetalcladdingassuchanditspenetrationsProcessconcerns(MOC,pipingdetailsetc)Differentperunit(EO,StyreneMonomer,Oxygen,Acid,Causticetcetc)MajorConcernsValvesFlowdirection:check;globevalvesandlowtemperaturevalvesthathaveacavityreliefhole.RVmanifoldsabove3inchAccuracyofinstallationwhendisassembled.AllignementsuchthatwithnotoolsRVcanbebuiltinLowtemperatureandLowalloysystemsMaterialsofconstructionofpressurizedpartsNoplainCSallowedanywhereinthepressureenvelope:roguematerialSpringhangersColdsetHotsetindicationandcorrecttravelinoperationDis-similarweldsGalvaniccorrosion,generalcorrosionatmixtureWhattoachieveNoincidentsNoaccidentsUnitruntimesof4–6yearsLowmaintenancePipingWalkdown-

WhatThecheck;tomakesure:codeshavebeenadheredtobuiltasperdesigndocumentssafeoperablemaintainablePipingWalkdown-WhoEPCcontractor/contractorE(ngineering)P(rocurement)C(onstruction)BSFBSCCNMF(Allthesepartiescanadditemstothepunchlist)PipingWalkdown-WhenPre-HydrotestM(echanical)C(ompletion)R(eady)F(or)S(tart)U(p)AnyothertimeforitemsrequiringmodificationsPipingWalkdown–When-differencesPre–Hydro*)PunchitemsthatrequireweldingormodificationstothesystempartstobetestedMC*)AllitemsinstalledexceptthosenotallowedduetocommissioningactivitiesRFSU*)Allinstalledandreadytostart*)Foratypicalchecklistseethehandout

PipingWalkdown-HowSeechecklistsinthehandoutUsepropertoolsEyes(visualexamination)handslighthammerknifePipingWalkdown-DocumentsDocumentsrequiredPEFSP(rocess)E(ngineering)F(low)S(cheme)IsometricPunchList(EPC/BSF/BSC)(Standardpipingsupportdrawings)PEFSStandardsymbols(Legend) Drwgnrs:25-8100-0000-0001…..00012

seehandoutComponentsAssembliesLinenumberPEFSnotesPEFS-LineNr

150-PL-110001-11011N-HC-A-ST150 : nominalsizePL : contents*)110(001) : unitnumber(110)001 : sequencenumber11011N : pipingclassnumberHC : insulationtype*)A : acousticinsulationtype*)ST : tracingtype*)

*)seehandoutPEFS–LineNr-PipingClass11011N1 : rating*)

1

: material*)011 : sequencenumber seeserviceindexN : deviationfromstandard*) pipingclassindication *)seehandoutPEFS-NotesGiveadditionaldesigninformationandrequirements:SlopeComponentlocationComponent/ValvetypeSequenceofeventsMiscellaneousOftenforgottenIsometricContainslinenrFullyinaccordancePEFSHasmaterialListShowsMESCnrsShowspaintingsystem,insulationsystem3-dimensionalrepresentationofwhatyouseeShowallsupportsandthetypePunchListContainsallitemsthataredeviatingfrom:safety;specifications;accessibility;operability;quality;goodworkmanship;appearance;lookgood;etcetcOntopicsasPaint,insulation,hook-up,sequenceofbranches,locationofinstruments

etcetcAllentriestobeagreedforvalidityExample–FlangeconnectionItemstocheckMaterialofStudbolts,nuts,gasket*),flangesStudboltsandnutsgreasedParallelismofflangesaftertighteningPaintInsulationifany(forexampleHotOilflangesnotinsulatedTightnessofallboltsandnuts:equallytightenedFinishofgasketseatingsurface(ifpossible)*)ForcolorcodingofSPWgasketseehandoutTypeofoperatedvalves

Risingspindle/QuarterturnGate(solid/flexiblewedge;knife,dualexpandingsluiceetc)GlobeNeedle/AnglevalveBall(top/endentry/splitbody,floatingball/trunnionmounted)ButterflyPlugPlugvalveGatevalveGlobevalveBallvalveBallvalvesSplitbody

TrunnionmountedFloatingballTypeofnon–returnvalvesNonslamnonreturnvalvesAxialflowpistontypeDualplateFeatherNormalnonreturnvalvesSwingTilteddiscBallPistonCheckValves

Swingty