30000立方米罐施工技术措施英.docx
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30000立方米罐施工技术措施英.docx
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30000立方米罐施工技术措施英
1ProjectOutline
1.1Projectbriefintroduction
TheprojectbelongstooneoftheexpansionprojectofKhartoumRefinery.Thecrudeoilcamefromoilpipelineoutsidetheplanttobestoredinthe4×30000m3tankaftermeasuringandtransporteddirectlybyfeedingpumptotheDelayCokingUnitasrawoil.
1.2Characteristicsoftheproject
1.2.1TheprojecthaslargeworkloadofweldingfromthepreparationofweldingsuchasWPS,weldersexaminationandtrainingtoweldingonsiteandnon-destructivetestsalltheworkneedtobestrictlymanaged.
1.2.2Theworkloadfromconstructionpreparation,procedurecontroltofinalinspectionislargeanddifficulttherebyallthestaffincludingworkersandadministratorshouldtakethefullresponsibilityoftheirworkandwitness.
1.3Compilingbasis
1.3.1TheconstructionprocessingandexperiencetheCompanygetsfromthesimilarproject.
1.3.2Theconstructiondrawingsandbiddingdocuments
1.3.3ThepracticalconstructionandacceptancespecificationsofChinaandpetroleumindustry
1.3.3.1SY/T4059-93《ConstructionAndAcceptanceSpecificationForCoatingAndInsulationWorkOfSteelVesssles》
1.3.3.2GBJ128-90《ConstructionAndAcceptanceSpecificationForVerticalDrumSeldingSteelOilTanks》
1.3.3.3GB50236-1998《ConstructionAndAcceptanceSpecificationForWeldingWorkOnSiteOfEquipmentAndIndustryPiping》
1.3.3.4GB50205-2001《ConstructionQualityAndAcceptanceSpecificationForSteelStructuresWork》
1.4Themainconstructionmeans
1.4.1Thetankstobeweldedbyhandarcweldingandtheshellstobefabricatedbylargeplateroller.
1.4.2Thetanksaretobeinstalledbythemethodofwater-filltoensursecurityandgoodshape.
1.4.3Whenwater-fillandtestthetanks,thewateristobetransferfromonetanktoanotherbyacentrifugalpumptosavewaterandspeedupthework.
1.4.4ThebottomsleakagetestsshouldbecarriedoutbyaJapaneseleakagetestboxtoincreasetheprecisionandspeedupthework.
2Constructionworkingprucedure
Workingprucedureisshowedinthefollowingform
ItemsNo.
Description
Workingcontents
1
Acceptanceoffoundations
Checktheintermediateacceptancecertificates;Checkthefoundationsforpropercentercoordinate,elevationandroughness;checkthesurfaceofpitch-sandlayerforproperlevelandcompactnessandfreeingofprotrusion,sagandprongingcracks;checkthefoundationofcircularbeamforproperlevelness.
2
Prefabricationofoiltank
1、Prefabricationofbottoms(includingbottomplates,annularplatesandbedplates)
2、Prefabricationofshells
3、Prefabricationoffloatingroof(includingsupports,internalandexternalsideplates,casings,frames,trusses,clapboardsandfirefightingbaffles)
4、Prefabricationofspiralstairway
5、Prefabricationofstiffenring
6、Prefabricationofwindgirder
7、Prefabricationofhorizontalprojection
8、Prefabricationofturningfloatingladderandguidingrail
9、Prefabricationofsealofroof
10、Prefabricationofheatexchanger
3
Installationofthebottomsoftank
1、Confirmingtheorientationoftheannularplateofthebottom
2、Pavingannularplate
3、Pavingbottomplate
4、WeldingandRTofthebuttweld300mmindistancefromtheedgetheannularplate
5、Weldingofbottomplate
6、Leakagevacuumtestingofbottomwelds
4
Installationofthebottomcircleofshell
1、Confirmingtheorientationofthefirstcircleshell
2、Liftshellstotheirpositionandadjustandcheckshellsforproperlevelnessandverticality;settingofshellsupports
3、Weldingofverticalwelds
5
Installationofthesecondcircleofshell
1、liftingandadjustingofshells
2、Weldingofverticalwelds
3、Weldingofcircularwelds
4、Grindingofwelds
5、RT
6
Endingofbottoms
1、WeldingofT-weldsbetweenshellsandrims
2、Completionofbuttweldsofannularplate
3、Completionofbuttweldsbetweenbottomplatesandannularplates
4、RTandleakagetestingofwelds
7
Installationoffloatingroof
1、Confirmingofassemblingorientationoffloatingroof
2、Paving,adjusting,weldingandvacuumleakagetestforthebaseplatesoffloatingroof
3、Locating,adjusting,weldingofexternalsideplatesoffloatingroofandkeroseneleakagetestingoffilletweldsandverticalwelds
4、Installationofframes,trussesandclapboards
5、Paving,weldingandvacuumleakagetestingofdeck
8
Installationoftheothercirclesofshell
1、Lifting,locatingandadjustingofshells
2、Weldingofverticalwelds
3、Weldingofcircularwelds
4、Polishingofwelds
5、RT
9
Installationofstiffenring
1、Fixingandliftingandlocating(withshellstogether)
2、Welding
10
Installationofwindgirder
1、Confirmingthepositionandinstallationoftripod
2、Liftingandassemblingofwindgirders
3、Weldingandcompletionofhandrail
11
Installationofhorizontalprojection
1、Assemblingandlifing
2、Welding
12
Drainageoftank
1、Resilienceobservingoffoundationsoftanks
2、Cleaninginsidetanks
13
Installationofspiralstairway,platformsandhandrail
1、Installationoftopplatformsandmiddleplatforms
2、Installationoftripodsofspiralstairway
3、Liftngandlocatingofupperandbelowsegmentofspiralstairways
4、Installationandweldingofhandrails
14
Installationofoilgagepipe
1、Alignmentandhatchoforientationoffloatingroof
2、Installationofracksandstingersupperandbelowpipe
3、Lifingandadjustingofoilgagepipe
15
Installationofturningfloatingladder
1、Installationofguidingrailofturningfloatingladders
2、Assembly,liftingandinpositionoffloatingladders
16
Installationofdrainpipe
1、Adjustmentoforientationofdrainpipes
2、Installation,inpositionandpressuretest
17
Installationofheater
1、Confirmingofinstallingposition
2、Pressuretestingafterthecompletionofinstallation
18
Settlementtestafterwaterfilled
1、Settlementobservation
2、Intensitytestoftankbody
19
Coatingandinsulation
1、Derustingbysandblastandcoating
2、Insulationoftank
20
Installationofsealingmechanism
1、Confirmingofinstallingorientationandequationing
2、Installationandinposition
21
Sealingmechanism
Hydraulictestingsealmechanismbywaterfillingoftanks
22
Takingoverandacceptance
1、Collectionandcleaningupofas-builtdata
2、Submittingoftakingoverandacceptancecertificates
3Mainconstructionmethod
Takingconsiderationof
constructingduration,thelocal
geologicconditionandwatersupply,
thetwotanksaretobeconstructed
simultaneouslybythemethod
ofwater-fill.
Sketchofwater-fillofthetanks
3.1Requirementofwaterforconstruction
Adopttofreshwater,waterresourcesholdbethepurifiedfire-fightingwatercamefromtheRefineryandthetemperatureofthewatercannotbelowerthan5℃.
3.2Constructionmethod
3.2.1Prefabricationofoiltank
3.2.1.1Prefabricationofannularplates
Masuringposition
permitteddeviation(mm)
LengthAB、CD
±2mm
WidthAC、BD、EF
±2mm
Deferencebetweendiagonals(AD-BC)
≤3mm
Dimensionmeasuringpositionofannularplate
Tworimsshouldbeleftasadjustingplateforeachtankandcutthematerialsaccordingtositedimensionsandsymmetricallylaythetwoplatesseparately.
3.2.1.2Prefabricationofbottomplate
Theweldingshrinkageandslopeofbottomshouldbetakenforconsiderationwhencutthematerialsofbottomplatesandcalculatethetheoreticaldimensionandincrease.
3.2.1.3Prefabricationofshells
1)Fabricationofshellsshouldbecarriedoutontheprefabricatingplatform.Drawouttheplatespavingsketchaccordingtomaterialsarrivalandprecessinghatchorientationpriortofabrication.
2)Bevellingangleandrootlandoftheshellsshouldbeinaccordancewithweldinganddrawingsrequipments.
3)thematerialsoftheshellsshouldbecutbythemethodofsetinglinesbyrightanglesandthepermitteddeviationofdimensionaftercuttinginaccordancewiththefollowingchart:
Dimentionpermitteddeviationoftheshells
Meassuringposition
Buttjoitofcircularweld(mm)
LengthofplateAB(CD)≥10m
LengthofplateAB(CD)<10m
WidthAC、BD、EF
±1.5
±1
LengthAB、CD
±2
±1.5
Diferencebetweendiagonals|AD-BC|
≤3
≤2
StraightnessAC、BD
AB、CD
≤1
≤2
≤1
≤2
3.2.1.4Prepatationoffloatingroofwithsinglecenterdeck
1)Iftheofferedmaterialsofbaseplatesandtopplatesdoffloatingroofaredisagreewiththedrawings,theplatespavingchartshouldbecompiledagainaccordingtoItem3.3.1inStandardGB128-90.
2)Thefrefabricationofframesandtrussoffloatingroofshouldbecarriedoutonthe12m×24mprefabricatingbench.TheprefabricatedcomponentsshouldbetaggedandthequalityofprefabricationshouldbeinaccordancewiththeexecutedStandardsforInstallationofSteelStructure.
3)Casingandsupportsprefabricationshouldbetaggedbytheircirclestopreventfromconfusing.Whenprefabricatethesupports,add100mmtoeachoneforadjustingtheunequalsettlementofthebottomofthetank.
4)Thecomponentsprefabricatedshouldbekeptcarefully.
3.2.1.5Prepatationofwindgirder
Cutthematerialsaccordingtodrawingstofabricatedtheplateofwindgirderandremovetheslagofthesurfaceoftheplates;thedimensionpermitteddeviationvalueofplatesarethesameastherims.
3.2.1.6Prepatationofspiralstairway
Inordertoincreaseworkquality,efficiencyandsfetyassurance,thespiralstairwaysaretobeprefabricatedandinstalledintwosegmentsaccordingtotheirstructurepeculiarity.Thestepsaretobeshapedbyplateroller.
Weldthetripodandmiddleplatformtothespiralstairwaypriortoassemble.Theseworkaretobeperformedduringtheconstructionworkofshells.
Payattentiontotheturningdirectionofthestairwaypriortoprefab
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