CO2液体贮槽使用说明书英文版.docx

CO2液体贮槽使用说明书英文版.docx

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CO2液体贮槽使用说明书英文版

LiquidCO2StorageTank

OperationandMaintenanceManual

HangZhouChuankongGeneralEquipmentCo.Ltd

Jul.2007

Contents

I.StructureDescription

II.OperationandMaintenance

1.Operation

2.Maintenance

III.TransportationandInstallation

1.Transportation

2.Installation

IV.SafetyRequirementsandPrecautions

1.SafetyRequirements

2.Precautions

I.StructureDescription

1.MainStructure

Thetankisofdouble-wallstructure.Itsinnervesselismadeofalloysteel16MnDRandpipingsaremadeofausteniticstainlesssteelanditsoutervesselismadeofcarbonsteelQ235-B.Thejacketbetweenthetwovesselsisfilledwithperliteandevacuated.Aspeciallytreatedadsorbentisplacedinthejackettoprolongthevacuumlifeofthetank.

Thetankisequippedwithnecessaryvalvesarounditsbottomforoperatingit.

2.Peculiarities

（1）Compactstructureandlessoccupiedspace;

（2）Thetankisequippedwiththeliquidfillingconnectorforfillingtheliquidtotheliquidvaporizersandtankers;

（3）Theperlite（thermalinsulationmaterial）andadsorbentinthejackethavebeenspeciallytreatedsoastoprolongthevacuumlife.Moreover,thetankisequippedwithametallicthermocouplegaugetubeformeasuringthevacuuminthejacketwhennecessary.

II.OperationandMaintenance

1.Operation

（1）Preparation

Beforebeingputintouse,thetankmustbesubjectedtoagas-tighttest,apurgingandacheckofvalvesandinstruments.

①Gas-tightTest

Thetankmustbesubjectedtoagas-tighttestbeforetheCO2liquidisfilledafterthetankisinstalledorthetemperatureoftheinnervesselreturnstothenormaltemperature.ThetestpressureshouldbetheMAWP（maximumallowableworkingpressure）ofthetankandthetestinggasshouldbeoil-freeanddryairordrynitrogen.Thetestingtimemustbefourhoursormore.

②Purging

Afterthegas-tighttestisaccepted,theinnervesselsystemofthetankmustbepurgedwithoil-freeanddryairornitrogentoremoveanymoisture.Afterpurgingwiththedryairornitrogen,thewholesystemmustbefurtherpurgedwiththeproductgasuntilthedischargedpurginggasreachestherequiredpurity.

③CheckingforValvesandInstruments

Makesurethatallthevalvesareincorrectopeningorclosingstateandthatalltheinstrumentsareincorrectindication,otherwisetheymustbeadjustedproperlybeforethecryogenicliquidisfilled.

（2）LiquidFilling

Theliquidfillingisdividedintofirstfillingandmake-upfilling.

1FirstFilling（i.e.thefillingwhentheinnervesselisatthenormaltemperature）

Thefillingstepsareasperfollows:

a）Connecttheliquidfillingpipeline.

b）Purgetheliquidfillingpipeline（thisstepmustbedonebeforeeachfilling）.Beforetheliquidinletvalveisopened,theliquidtransferringpipemustbefilledwithasmallquantityofliquidviatheliquiddischargingvalveandatthesametimetheresidualliquiddrainingvalvemustbeopenedtopurgethepipelineforeliminatingthemoistairandmechanicalimpuritiesfromit.

c）FillgasCO2（pressure≥1.2MPa,temperature≥15℃）fromgas-throughvalvetotheinnervesseluntilthepressureoftheinnervessel＞1.2MPa.

d）Openthelowerfillingvalvetofilltheliquidfromthebottom,

thevalvemustbeslightlyopenedinordertocoolthepipelineandinnervesselgraduallytothetemperatureofthefilledliquid.Whentheliquidlevelgaugebeginsindicatingliquidlevel,thefillingvalvemaybefurtheropenedtoincreasethespeedoffilling.

e）Whensomeliquidissprayedfromthefullnesstestvalvewhichisalreadyopened,itmeansthatthetankhasbeenfullyfilledwithliquidandthenthelowerfillingvalveshouldbeimmediatelyclosedtostopthefilling.Atthesametimetheresidualliquiddrainingvalveshouldbeopenedtodrainoffanyresidualliquidfromtheliquidfillingpipeline.Duringfilling,ifnecessary,ventingvalvecanbeopened;Pressureoftheinnervesselmustbehigherthan1.2MPanomatteratanyconditionoratanytime.

g）Disconnecttheliquidfillingpipelineuponcompletionoftheliquidfilling.

②Make-upFilling（i.e.thefillingwhentheinnervesselisatthe

temperatureoftheCO2liquid）

Thestepsforthemake-upfillingarealmostthesameasthosefortheFirstFilling.TheonlydifferenceisthatsomeCO2liquidalreadyexistsintheinnervesselandthatitisunnecessarytocooltheinnervessel.Thereforetheliquidmaybefilleddirectlyfromthelowerfillingvalveafterthepipelineispurged.

Fortherelationbetweentheliquidvolumeandtheliquidlevel,seethecurvediagramplatemountedonthetank.

（3）Storage

Duringstorage,pressurechangeshouldbeloggedcarefully.Whenpressureishigherthan2.16MPa,ventingvalvemustbeopen,butthepressuremustbehigherthan1.2MPaatanycondition.

（4）LiquidDischarge

Therearetwotypesofliquiddischarge:

1DischargeofLiquidfromoutletvalve

2DischargeofLiquidfromLiquidInlet/OutletValve

Theliquidisdischargedtoatankerorotherbiggertankviathe

liquidfillinghose.Itsoperatingstepsarebasicallythesameas

thosefortheliquidfilling,butthelowerliquidinletvalveisusedfordischargingtheliquidinsteadoffillingtheliquid.

2.Maintenance

（1）InsulationPerformanceProtection

FortheCO2liquidstoringandtransportingequipment,themostimportantrequirementisthattheyshouldhavegoodinsulationperformanceandalowboil-offofthecryogenicliquid.Vacuumisthekeypointoftheinsulationperformance.Thethermalconductivityoftheperliteatnormaltemperatureandpressureis0.045kcal/m.h.Kwhilethatatthevacuumof66.66~1.33Pais0.00225kcal/m.h.K.Sowecanseethatunderthesameotherconditionstheheattransferdifferenceis20timesdependingonthejacketvacuum（transferredheat:

Q=KF△t1-1）.

Wheneverthevacuumisdeteriorated,itisimpossibletostorethecryogenicliquidinthetank,soalotofattentionsshouldbepaidtothevacuumofthetank.Theoutervesselanti-explosiondeviceandthe

evacuatingvalvearedirectlycommunicatedwiththevacuumjacket.Itisnotallowedtodismantlethemifthevacuumisnotdeterioratedoritisunnecessarytomakeuptheperliteandtore-evacuatethejacket.Theevacuatingvalveislead-sealedanditisprohibitedtoremovethevalveatrandom.

Theoutervesselisanexternalpressurevesselandsubjectedtotheatmosphericpressureandthusnostrikingorbumpingisallowedtoavoidanydamagetotheoutervessel.Itisnotallowedtoplacethetankintheareawherethetemperatureishigherthan50ºC,otherwisethevacuumwillbeaffectedandtheinsulationperformancewillbelowered.

（2）VacuumExaminationandRe-evacuation

Vacuumofthetankshallbecheckedeveryhalfayearingeneral.Whenmeasuringthevacuum,removethecoverofthemetallicthermocoupletubeandinserttheplugofthethermocouplevacuumgauge,thusthevacuumlevelinthejacketcanbemeasured.Fordetails,refertotheoperationmanualofthethermocouplevacuumgauge.

Afterseveralyears'operation,thevacuummaydroptothevaluelowerthan67Paanditisnecessarytore-evacuatethejackettoimprovetheinsulationperformance.Beforere-evacuation,theliquidinthetankmustbedischargedentirelyandthenthetankmustbewarmedandpurgedwithdryandoil-freeairorthegaseousnitrogenat80~100ºCuntilitrecoverstothenormaltemperature.Uponcompletionofconnectingtheevacuatingpiping,thepumpmustbefirstlystartedforpumpingoutthemoistureintheairofthevacuumpipeandthenthevacuumvalvemaybeopenedforre-evacuating.

Forthedetailsofevacuation,ifnecessary,theusercancontactwiththetankmanufacturer.Bothpartiescandecidethroughdiscussionthespecificprocedureofevacuation.

（3）CheckingandTroubleshooting

1NormalChecking

a）Makesurethatthevalvesareinproperopening/closingposition;

b）Makesurethatthepressuregaugesandliquidlevelgaugeiscorrectandreliable;

c）Makesurethatthereisnoleakageorblockageinthepipelineand

valves;

d）Whenthepressureinthetankgetstotheopeningpressureofthe

safetyvalvebutthevalvedoesnotwork,theopeningpressureof

thevalvemustbecalibratedimmediatelytoinsurethesafetyofthe

tank.

2PeriodicalChecking

a）Thepressuregaugesshallbecalibratedoncehalfayear;

b）Thesafetyvalveshallbecalibratedonceayear;

c）Thevacuuminthejacketshallbemeasuredeveryhalfayear;

③Trouble-shooting

Forthedetailsoftroublesthatmaypossiblyoccurduringoperationandtheircauseandremedy,seeTable1.

Table1.Troubleshooting

Trouble

Cause

Remedy

Internalpressurerisesabnormallyduringoperation.

a.Pressuregaugeindicatesincorrectly.

Repairorreplacethepressuregauge.

b.Vacuumofinterlayerdeteriorated

Re-evacuate

Liquidlevel

gaugeindicatesincorrectly

a）Thegaugeisoutoforder.

Repairtheliquidlevelgauge.

b）Upperandlowerpipesofthegaugeleak.

Checkthemandeliminatetheleakage.

c）Thejointofthegaugeleaks.

Checkitandeliminatetheleakage.

Theboil-offistoohighandsomefrostoccursatthetopofthetank.

a）Thevacuumisdeteriorated.

Re-evacuatethejacket.

b）Theperlitesinksandisnotfilleddensely.

Addperliteandre-evacuatethejacket.

Someliquidorgasleaksfromthevalvecaporjoint.

a）Sealingpackingisnotpressedtightly.

Tightenthepackinggland.

b）Sealingringisbroken.

Replacethesealingring.

c）Sealingfaceisdamaged.

Replaceorreplacethepart.

d）Someweldleaks.

Repairtheweldasperthespecificprocedure.

III.TransportationandInstallation

3.Transportation

（1）Afterthetankarrivesatthe