大罐吹掃、干燥、預(yù)冷方案

靖邊西藍(lán)自然氣綜合利用工程10000靖邊西藍(lán)自然氣綜合利用工程10000M3LNG儲(chǔ)罐安裝工程靖邊西藍(lán)自然氣綜合利用工程10000M3LNG張家港中集圣達(dá)因低溫裝備202393日目錄1、SCOPE范圍CRITERIAOFPURGINGANDDRYING枯燥和吹掃標(biāo)準(zhǔn)3、PRELIMINARYCHECKSANDSET-UP初步的檢查和組織安排4、QUALITYOFNITROGENGAS氮?dú)赓|(zhì)量5、NITROGENPURGEANDDRYOUT氮?dú)獯祾吆涂菰?.1、PurgeanddryoutinnertankZoneA(Step1)內(nèi)罐區(qū)域A吹掃和枯燥〔步驟1〕5.2、PurgeanddryoutzoneB(step2) 區(qū)域B吹掃和枯燥〔步驟2〕5.3、Purgeanddryoutbottom(step3) 底部吹掃和枯燥〔步驟3〕5.4、PurgeanddryoutofnozzlesandzoneB(step4)B吹掃與枯燥〔4〕6、PRODUCTGASPURGE產(chǎn)品氣體吹掃、Initialconditions初始條件、ProductGaspurgeZoneA(step5) 產(chǎn)品氣體吹掃區(qū)域A〔步驟5〕6.3、ProductgasPurge,ZoneB(step6) 產(chǎn)品氣體吹掃區(qū)域B〔步驟6〕6.4、‘Productgas’purgeofnozzles(Step7) 產(chǎn)品氣體吹掃管道〔步驟7〕7、COOL-DOWN冷卻、Initialconditions(step8) 初始條件〔步驟8〕、Cool-downprocess(step9) 冷卻過(guò)程〔步驟9〕8、AppendixA–ToolsandInstrumentsA-工具和儀表SCOPE 范圍Thisspecificationcoverstheprocedureforpurging,dryoutandcooldownofone10000capacity,singleintegrity,refrigeratedstoragetank,storingLNGat-163C.說(shuō)明文件描述容積為一萬(wàn)方、構(gòu)造完整、低溫儲(chǔ)罐、儲(chǔ)存LNG溫度為-163°C的儲(chǔ)罐，內(nèi)容為吹掃、枯燥以及冷卻程序Note:‘Product’statedinthisprocedurereferstoLNGAT-163°C.‘Productgas’statedinthisprocedurereferstowarm(ambienttemperature)LNGvapour.留意：所規(guī)定的“產(chǎn)品”指-163°CLNG，所規(guī)定的“產(chǎn)品氣體”指環(huán)境溫度下的LNG蒸汽。CRITERIAOFPURGINGANDDRYING 吹掃和枯燥標(biāo)準(zhǔn)ZONE區(qū)域A:INNERTANKANDDOMESPACE內(nèi)罐和頂部空間O2CONCENTRATION(VOL%)氧氣濃度<8%ZONE區(qū)域A:INNERTANKANDDOMESPACE內(nèi)罐和頂部空間O2CONCENTRATION(VOL%)氧氣濃度<8%DEWPOINT露點(diǎn)(ATATMOSPHERICPRESSURE)在大氣壓力下BELOW–20C低于-20°CB:ANNULARSPACE夾層<8%BELOW–20°C*NOTECriteriaofNitrogenpurgingusing‘Productgas’shallbeasfollows:ZONE區(qū)域ZONE區(qū)域N2CONCENTRATION(VOL氮?dú)鉂舛華:INNERTANKANDDOMESPACE內(nèi)罐和頂部空間<8%DEWPOINT露點(diǎn)(ATATMOSPHERICPRESSURE)在大氣壓力下BELOW–20C低于-20°CB:ANNULARSPACE夾層<8%BELOW–20°C*NOTE低于-20°C*注釋

體吹掃和*Note:-20°CofthedewpointinzoneBisspecifiedasatargetvalue.IfthedewpointinzoneBhasnotreacheditstargetvaluebuthasexceeded–10°Cafterthescheduleddryingandpurgingthentheoperationmayproceedtothenextstep. *注釋：區(qū)域B中的露點(diǎn)-20°C是規(guī)定的目標(biāo)值。假設(shè)區(qū)域B10C，那么操作可以進(jìn)入下一步驟。PRELIMINARYCHECKSANDSET-UP 初步檢查和組織安排Allspecifiedtestingandinspectionworksshallhavebeencompletedandacceptedpriortocommencementofthedryingandpurgingoperation.全部測(cè)試和檢查工作應(yīng)當(dāng)在吹掃和枯燥程序開(kāi)頭之前全部完成以及被確認(rèn)。Alltemporaryandpermanentinstrumentationandprotectiondevicessuchasreliefvalvesandvacuumbreakervalvesshallhavebeeninstalled,checkedforoperationandcalibrated.全部臨時(shí)的和永久的儀表以及安全設(shè)備，例如安全閥、真空斷路閥，都應(yīng)安裝好，以檢查動(dòng)作調(diào)整狀況。Thetankinsulationworkshallhavebeencompleted.儲(chǔ)罐絕熱工作已經(jīng)完成。Priortofinalclosingup,thetankshouldbevisuallyinspectedtoensurethatitiscleanandfreefromanyforeignmatterandthatallthefittingsandinstrumentsarecorrectlyinstalledandcheckedforproperoperation.配件和儀表是否正確安裝EnsureNitrogengasfacilityhasbeenprovidedtoallowNitrogengastobesuppliedtopurgeinputnozzlesN15andN4.確保氮?dú)庠O(shè)備供給的氮?dú)饽軌蚬┙o置換輸入管口N15和N4Downwardbentpipesorpropercanopiesshallbeprovidedatallventnozzlestopreventwaterinvasion.向下的彎頭或者適宜的罩子應(yīng)安裝在全部的管口上以避開(kāi)水的進(jìn)入AnylocationwherethereisdangerofsuffocationcausedbyventedNitrogen/‘Productgas’shouldbeclearlymarkedwithdangersignsandbarriers.Portablegasdetectorsandbreathingapparatusshallbelocatedattheseareas.任何有窒息危急的位置〔因排放氮?dú)?產(chǎn)品氣體而導(dǎo)致窒息〕應(yīng)當(dāng)清楚地以危急符號(hào)和柵欄為標(biāo)記，便攜式氣體檢測(cè)器和通氣供氧設(shè)備應(yīng)放在這些位置區(qū)域Duringpurginganddryingthetank,pressureshouldbecontrolledtomaintainapressureofaround300-600mmH2O.在吹掃和枯燥儲(chǔ)罐的過(guò)程中，壓力應(yīng)被掌握在300-600mmH2O左右Atemporarymanometershouldbeinstalledtomonitortheoperatingpressure.安裝一臺(tái)U管壓力計(jì)用來(lái)監(jiān)測(cè)運(yùn)行時(shí)的壓力QUALITYOFNITROGENGAS 氮?dú)赓|(zhì)量Thetankshouldbepre-driedwithdryairpriortopurgingwithNitrogengas.儲(chǔ)罐應(yīng)用枯燥空氣在用氮?dú)獯祾咔斑M(jìn)展預(yù)枯燥AirandanyremainingmoistureinsidethetankshallbepurgedwithdryNitrogengas.儲(chǔ)罐內(nèi)空氣和任何剩余水分應(yīng)用枯燥氮?dú)獯祾逿heNitrogengastobeusedforOxygenpurginganddryingshallbesuppliedaccordingtothefollowingspecification:用于吹掃和枯燥氧氣的氮?dú)鈶?yīng)按以下的技術(shù)要求來(lái)供給：PurityPurity純度Dewpoint露點(diǎn)Flowrate流量>98%<-60°C300-600nmchnmch=normalisedmetre3perhourNITROGENPURGEANDDRYOUT 氮?dú)獯祾吆涂菰颬urgeanddryoutinnertankZoneA(Step1)A吹掃和枯燥〔1〕Monitorthetankpressureduringpurgeanddryout.在吹掃和枯燥過(guò)程中監(jiān)測(cè)儲(chǔ)罐壓力EnsureNitrogenbottompurgevalveN4,annuluspurgevalveN16andBottompurgevalvesN23A&Bareclosedduringpurgeofinnertank.確保底部進(jìn)氣閥N4、夾層排氣閥N16、底部排氣閥N23A&B在吹掃內(nèi)罐的過(guò)程中是關(guān)閉的。Openvalveonpurgeinletnozzle(N15)andintroduceNitrogengasintotheinnertank.翻開(kāi)N15管口上的閥門，吹掃氮?dú)馔ㄟ^(guò)此管口進(jìn)入內(nèi)罐。Whentheinnertankpressurereaches400m2Hopenthevalveonpurgeventnozzle(N17)anddischargethepurgegastoatmosphere.400mmHO時(shí)，翻開(kāi)吹掃排放管口N17上的閥門，吹掃氣體從今管2口排放出去。EnsurethattheNitrogengasissuppliedataratebetween300to600hr.Startpurgeatthelowerrateandgraduallyincreaseafter4hours.300600Nm3/hr之間，在較低比率時(shí)開(kāi)頭吹掃，在4小時(shí)后漸漸上升。MonitortheO2concentrationandthedewpointoftheventedNitrogengasatN17.WhentheO2concentrationanddewpointoftheventedNitrogengasatN17isapproachingtherequiredlevelsasdefinedinsection2abovethenproceedtothenextsection(step2).監(jiān)測(cè)N172局部定義的要求時(shí)，然后進(jìn)入下一步驟〔步驟2。PurgeanddryoutzoneB(step2)B吹掃和枯燥〔2〕WhentheOxygenconcentrationatN17islessthan8%duringpurgeoftheinnertankandroofspaceasdescribedaboveopenthevalveN16tocommencepurgingofzoneB.當(dāng)在N17位置在內(nèi)罐和頂部空間吹掃過(guò)程中如上表達(dá)氧氣濃度低于8%時(shí)，翻開(kāi)N16閥門開(kāi)頭吹掃區(qū)域BWARNING,ENSUREALLPRECAUTIONSAREINPLACETOENSUREALLPERSONNELAREPROTECTEDFROMSUFFOIONFROMNITROGENDURINGTHEPURGEOPERATION.警告，確保全部預(yù)防措施到位以保證全部人員受到防護(hù)，避開(kāi)在吹掃過(guò)程中因氮?dú)鈱?dǎo)致窒息。MonitortheO2concentrationandthedewpointoftheventedNitrogengasatN17.監(jiān)視N17排放出氮?dú)庵械难鯕鉂舛群吐饵c(diǎn)WhentheventedgasanddewpointoftheventedNitrogengasatN17arebelowtherequiredlevelsasdefinedinsection2abovereducethesupplyrateofNitrogenandthenclosenozzleN17.ThesupplyrateoftheNitrogenshouldbeadjustedtoavoidoverpressurisingtheoutertank.Itisimportanttopurgetheannularspaceslowlytoavoidthepurgegastunnellingthroughtheresilientblanketalone.當(dāng)排放氣體和N17位置排放氮?dú)獾穆饵c(diǎn)低于在第2量然后關(guān)閉管口N17。氮?dú)夤饬繎?yīng)調(diào)整以避開(kāi)對(duì)外罐施加過(guò)多的壓力。緩慢置換夾層是很重要的，要避開(kāi)產(chǎn)生隧道效應(yīng)〔吹掃氣體只單獨(dú)穿過(guò)彈性毯〕Proceedtothenextsection(step3). 進(jìn)入下一步驟〔3〕Purgeanddryoutbottom(step3)底部吹掃和枯燥〔步驟3〕WhentheOxygenconcentrationatN16islessthan10%duringpurgeoftheannularspaceasdescribedaboveopenvalvesN4,N23A&Btocommencepurgingofthebottominsulation.當(dāng)吹掃夾層過(guò)程中如上所述N1610%時(shí)，翻開(kāi)N4、N23A&B閥門開(kāi)頭吹掃底部絕熱層。WARNING,ENSUREALLPRECAUTIONSAREINPLACETOENSUREALLPERSONNELAREPROTECTEDFROMSUFFOIONFROMNITROGENDURINGTHEPURGEOPERATION.警告，確保全部預(yù)防措施到位以保證全部人員受到防護(hù)，避開(kāi)在吹掃過(guò)程中因氮?dú)鈱?dǎo)致窒息。MonitortheO2concentrationandthedewpointoftheventedNitrogengasatN23A&B.監(jiān)測(cè)N23A&B排放氮?dú)庵醒鯕鉂舛群吐饵c(diǎn)WhentheconcentrationanddewpointoftheventedNitrogengasatN23A&Bisbelowtherequiredlevelsasdefinedinsection2abovethenclosenozzlesN4,N23A&BandreducethesupplyrateofNitrogen.ThesupplyrateoftheNitrogenshouldbeadjustedtoavoidoverpressurisingtheoutertank.當(dāng)N23A&B排放氮?dú)獾臐舛群吐饵c(diǎn)低于如上所述其次局部中定義的要求時(shí)，關(guān)閉管口N4、N23A&B，以及降低氮?dú)夤饬?。氮?dú)夤饬繎?yīng)被調(diào)整以避開(kāi)對(duì)外罐施加過(guò)多的壓力Proceedtothenextsection(step4). 進(jìn)入下一步驟〔4〕PurgeanddryoutofnozzlesandzoneB(step4)B吹掃與枯燥〔4〕DuringthepurgingofzoneBpurgeoutallnozzlesandrooftoppiping.Openeachvalveonallnozzles,pipingandappurtenancestopurgeanyentrappedair.在吹掃區(qū)域B時(shí)，吹掃全部管口和頂部管道，翻開(kāi)全部管口、管道、附件的閥門進(jìn)展吹掃任何位置夾帶的空氣。MonitortheO2concentrationandthedewpointoftheventedNitrogengasateachpoint.在每一位置監(jiān)測(cè)排放氮?dú)獾难鯕鉂舛群吐饵c(diǎn)。WhentheventedgasanddewpointoftheventedNitrogengasateachpurgepointisbelowtherequiredlevelsasdefinedinsection2abovethenclosetherelevantvalve.2局部所定義的要求時(shí)，關(guān)閉相關(guān)閥門。Closeallvalvesonallnozzles,pipingandappurtenances.關(guān)閉全部管口、管道、附件的閥門。ClosethepurgesupplyvalveN15.關(guān)閉吹掃氣體供給閥N15。ClosetheannularpurgevalveN16. 關(guān)閉夾層放氣閥N16PRODUCTGASPURGE 產(chǎn)品氣體吹掃Initialconditions 初始條件Ensureallpermanentpressureandvacuumreliefvalvesareoperational.確保全部的固定壓力和真空解除閥是可使用的。Disconnectalltemporarypiping,ifany,associatedwithNitrogenpurginganddryout.假設(shè)有與氮?dú)獯祾吆涂菰锵嚓P(guān)的臨時(shí)性管道，全部撤除。Ensurethatallinstruments,suchasthefollowingareinoperationalcondition.確保全部?jī)x表是可使用的，例如如下幾種：Temperaturesensors. 溫度傳感器Thetankgaugingsystems. 儲(chǔ)罐度量系統(tǒng)Pressuresensors. 壓力傳感器ProductGaspurgeZoneA(step5)A〔5〕EnsureannuluspurgevalveN16isclosedafterNitrogenpurgeofinnertank.確保在內(nèi)罐氮?dú)獯祾咧髪A層放氣閥N16是關(guān)閉的。Ensurewarm(ambienttemperature)‘Productgas’isconnectedandavailabletotheproductsupplylineeitherviatheprocessorviatheinjectionpointonthepiperack.確保環(huán)境溫度下“產(chǎn)品氣體”已經(jīng)通過(guò)管線輸送到儲(chǔ)罐，并能滿足吹掃需要量。OpenthevalveontheboiloffgasoutletnozzleN6toventtheNitrogengasinthetank,replacingitwithwarm(ambienttemperature)‘Productgas’.翻開(kāi)管口N6的BOG閥門以排放儲(chǔ)罐內(nèi)的氮?dú)?，用環(huán)境溫度下的“產(chǎn)品氣體”置換罐內(nèi)的氮?dú)?。OpenthebottomproductinletvalveN2andintroduce‘Productgas’intothetank.翻開(kāi)底部進(jìn)液閥N2引導(dǎo)產(chǎn)品氣體進(jìn)入儲(chǔ)罐。Warning:ensurethatonlywarmproductgasisallowedintothetankatthisstage.Onnoaccountshouldcoldproductbeintroducedintothelin.e確保在這階段中進(jìn)入儲(chǔ)罐的是環(huán)境溫度下的產(chǎn)品氣體，切莫使冷的產(chǎn)品氣體進(jìn)入供給線。Monitortheconcentrationof‘Productgas’intheboiloffgasline.監(jiān)測(cè)BOG管線上“產(chǎn)品氣體”的濃度。Whenthe‘Productgas’concentrationreaches92%openN17topurgethedomespaceofNitrogen.當(dāng)“產(chǎn)品氣體”的濃度到達(dá)92%，翻開(kāi)N17以吹掃頂部空間的氮?dú)釶roductgasPurge,ZoneB(step6)B〔6〕WhentheNitrogenconcentrationatN17islessthan8%duringpurgeoftheinnertankandroofspaceasdescribedabove,openthevalveN16tocommencepurgingofzoneB.當(dāng)內(nèi)罐和頂部空間吹掃過(guò)程中N178%，翻開(kāi)N16閥門開(kāi)頭吹掃區(qū)域BMonitortheN2concentrationandthedewpointoftheventedNitrogengasatN16.監(jiān)測(cè)N16位置排放氮?dú)獾牡獨(dú)鉂舛群吐饵c(diǎn)WhentheventedgasanddewpointoftheventedNitrogenatN16isbelowtherequiredlevelsasdefinedinsection2abovethenclosenozzleN17andreducethesupplyrateof‘Productgas’.Thesupplyrateofthe‘Productgas’shouldbetoavoidpressurisingtheoutertank.Itisimportanttopurgetheannularspaceslowlytoavoidthepurgegastunnellingthroughtheresilientblanketalone.當(dāng)排放氣體以及N162局部所定義的要求時(shí)，關(guān)閉管口N17和降低“產(chǎn)品氣體”的供給量過(guò)多的壓力，緩慢置換夾層是很重要的，要避開(kāi)產(chǎn)生隧道效應(yīng)。‘Productgas’purgeofnozzles(Step7)產(chǎn)品氣體吹掃管口〔7〕AfterclosingnozzleN17,purgeoutthenozzlesandrooftoppiping.Openeachvalveonallnozzles,pipingandappurtenancestopurgeanyentrappedNitrogen.在關(guān)閉管口N17之后吹掃管口和頂部管道，翻開(kāi)全部管口、管道、附件的閥門以吹掃任何夾帶氮?dú)?。MonitortheN2concentrationandthedewpointoftheventedNitrogengasatN16.監(jiān)測(cè)N16位置排放氮?dú)獾牡獨(dú)鉂舛群吐饵c(diǎn)。WhentheventedgasanddewpointoftheventedNitrogengasateachpurgepointisbelowtherequiredlevelsasdefinedinsection2abovethenclosetherelevantvalve.當(dāng)各位置排放氣體和排放氮?dú)獾穆饵c(diǎn)低于第2局部所定義的要求時(shí)，關(guān)閉相關(guān)閥門Closeallvalvesonallnozzles,pumpcolumns,pipingandappurtenances.關(guān)閉全部管口、泵柱、管道和附件處的閥門。ClosetheProductsupplyvalveN2. 關(guān)閉產(chǎn)品氣體供給閥N2。ClosethePurgevalveN16. 關(guān)閉放氣閥N16。ClosetheBoiloffgasvalveN6. BOG閥門N6。Re-installblankingflangesforinservicearrangementofnozzleswhereappropriate.相關(guān)的吹掃管口重安裝盲法蘭以實(shí)現(xiàn)使用中對(duì)管口的要求。COOL-DOWN冷卻Initialconditions(step8) 初始條件〔8〕Thetankshallbecooleddownatacontrolledratetopreventthermalstressingoftheinnertank.儲(chǔ)罐冷卻應(yīng)受到掌握，以預(yù)防內(nèi)罐熱應(yīng)力收縮太大。Thefollowingparametersgoverntheoperation. 以下因素掌握操作要求。Innertankcoolingshallbecontrolledat3perhour.Maximumpermissiblecoolingmeasuredatanythermocoupleshallnotexceed°perhour.內(nèi)罐冷卻掌握在每小時(shí)3°C5°CThemaximumdifferentialtemperaturesbetweenadjacentthermocouplesshallnotbegreaterthan20C.20°CThemaximumdifferentialtemperaturesacrossallthermocouplesshallnotbegreaterthan50C.50°CThetankpressureshallnotexceedtheoperatingpressure.儲(chǔ)罐壓力不應(yīng)超過(guò)工作壓力。RecommendedCooldownusingproduct. 推舉用產(chǎn)品冷卻Assumedstarttemperature假設(shè)開(kāi)頭溫度 35°CFlowrateforcooldownspraynozzle凝噴嘴流量 32l/minat3bare凝噴嘴流量 42l/minat5barEstimatedtimeforcooldown卻估量時(shí)間 228hoursEstimatedquantityofLNGrequiredforcooldown 185tonnesLNG估量需求量罐底液體根部 300mm147m3EstimatedquantityofLNGforliquidheel 62tonnesLNG液體根部估量數(shù)量TotalquantityofLNGLNG總量(cooldown+liquidheel)〔冷卻用+液體根部〕 247tonnesTankavailablefortheintroductionofproduct `LNGLNGCooldown185tonnesofLNGrequired32lpm3bar41.9lpm5b