管道施工方案

ConstructionSchemesforPipingWorks

1概述

GeneralStatement

乙烯裝置一標段的管道施工，主要是裂解區、急冷區、壓縮二區、裂解汽油加氫區和廢堿處理

區管道安裝。管道安裝工程量91034米，管道材質有碳鋼、低溫鋼、不銹鋼及銘鋁合金鋼，管道

安裝的主要工程量見表1。

TheconstructionofthepipingworksforthetenderedWorksIintheethylenecomplexcovers

mainlythepipinginstallationforthecrackingheaterarea,quencharea,compressionarea2#,

pyrolysisgasolinehydrogenationareaandthespentalkalitreatmentarea.Thequantityforthe

pipinginstallationworksamountsareabout91,034metersandtheinvolvedconstruction

materialsofthepipingincludecarbonsteel,lowtemperaturesteel,stainlesssteelaswellas

chrome-molybdenumalloysteel.Forthemajorquantityofpipinginstallationworks,referto

Table1.

一標段管道工程量表1

Table1QuantityofPipingInstallationforTenderedWorksI

序號名稱規格單位數量備注

S/NDescriptionSpecificationsUnitQuantityRemarks

碳鋼管

0.5"-2"m38680

CSPiping

碳鋼管

>2〃m41688

CSPiping

不銹鋼管

0.5"~2"m3569

SSPiping

不銹鋼管

>2〃m2669

SSPiping

銘鋁鋼管

0.5"-2"m1842

Cr-MoPiping

銘鋁鋼管

>2〃m2586

Cr-MoPiping

合計

m91034

Total

碳鋼閥門個

0.5"-2"8525

CSValvesset

碳鋼閥門個

>2〃1324

CSValvesset

不銹鋼閥門個

0.5〃~2〃619

SSValvesset

不銹鋼閥門個

>2"82

SSValvesset

絡鋁鋼閥門個

0.5"-2"125

Cr-MoValvesset

銘鋁鋼閥門個

>2"163

Cr-MoValvesset

合計個

10838

Totalset

方案編制依據:

BasisoftheSchemesPreparation

——SECCO提供招標文件中的技術資料和標準規范；

TechnicalInformationandstandardsandcodesprovidedinSECCO*sbidinviting

documents;

一國內的有關標準和相應的施工及驗收規范；

Applicablenationalstandardsandtherelevantconstructionandacceptancespecification;

——我公司在其他乙烯工程施工的經驗。

Ourexperienceofconstructiononotherethyleneprojects.

乙烯裝置工藝管道全部采用工廠化預制加工，現場分段安裝。

Alltheprocesspipingusedintheethyleneplantshallbeprefabricatedinshopand

installedsegmentbysegmentonsite.

2施工準備

ConstructionPreparations

⑴安裝前，施工技術人員應根據設計文件、施工圖及標準規范結合裝置實際情況編制詳細地切

合實際的施工方案，并經逐級審批完畢后，向各工種施工人員進行技術交底。

Thetechnicalpersonnelinchargeofconstructionshall,priortotheinstallation,develop

detailedandpracticableconstructionschemesbasedupontherequirementsoftheengineering

documents,theconstructiondrawingsandthestandardsandcodesinintegrationwiththe

actualscenariooftheplantandclarifysuchschemestotheworkmeninvolvedintheindividual

typesofworkfollowingthestepbystepreviewandapprovalprocesses.

⑵參加施工人員應認真熟悉施工圖、設計文件及標準規范規定和方案要求深刻領會設計意圖，

了解管道施工的方法、工藝、技術要求和質量標準。

Allthepeopleinvolvedintheconstructionactivitiesshallgetthemselvesacquaintedwith

theregulationsspecifiedintheconstructiondrawings,engineeringdocumentsandthe

standardsandcodesaswellastherequirementsoftheconstructionschemes,haveagood

masteryoftheengineeringdesignintentsandknowwellaboutthemethods,processes,

technicalspecificationandqualitycriteriawithrespecttothepipinginstallationworks.

⑶根據施工方案準備工裝，搭設平臺設置管道預制加:[:廠,設置管道、配件存放倉庫和場地。

Topreparefortoolsandfacility,buildplatforms,setupawarehouseandfieldforstoring

pipingand租ting⑷做好施工機具、設備的準備工作，切割機、電焊機、空壓機、烘干箱等應性能良

好，隨時可用。計量、調校及測量用儀器業經校驗合格，并在復檢期內。

Tomakeavailableforconstructionmachineriesandtoolsandtheequipments.Thecutters,

weldingmachines,aircompressorsandelectrodeovensrequiredbyconstructionshouldbe

maintainedatgoodworkingconditionsforreadyuse.Theinstrumentsandapparatusesfor

metering,calibrationandmeasurementpurposesshouldhavebeenverifiedforconformityand

bewithintheirvalidityperiod.

3材料檢驗

MaterialsInspection

3.1管材、管件檢驗

InspectionsforPipingandPipingFittings

⑴檢驗準備

PreparationsforInspection

①壓力管道工程用管材、管件，應按照相應標準組織實施對管材、管件的檢驗。管材、管件檢

驗由供應部長組織、技術人員和質量檢驗人員參加。

Inspectionsforpipingandpipingfittingsofthepressurepipingworksshallbeorganized

andimplementedaspertheapplicablestandards.Theinspectionsforpipingandpipingfittings

ofpipingshallbeorganizedbytheDirectoroftheMaterialSupplyDepartmentandparticipated

bytherelevanttechnicalpersonnelandqualityinspectors.

②管材、管件檢驗應設有獨立的檢驗場地，并劃分出待檢區、檢驗區、合格品區和不合格品區。

Anindependentinspectionfieldshallbeprovidedforthepipingandpipingfittings,Itshall

bedividedintofourzonesthatiswaitinginspectionzone,inspectionzone,acceptablezoneand

non-acceptablezone.

③管材、管件檢驗前，應進行檢驗作業技術交底。

Priortotheinspectionsforthepipingandpipingfittings,atechnicalclarificationforthe

inspectionoperationsshouldbeimplemented.

⑵管材、管件檢驗程序

Inspectionproceduresforthepipingandpipingfittings

檢驗程序(管材、管件檢驗程序見圖3.1)

Inspectionprocedures(refertoFig.3.1fortheinspectionproceduresforpipingandpiping

fittings)

圖3.1管材、管件檢驗程序圖

VisualMaterialchecks&

inspectionson

quaftyvwtness

pipingand

pipingfittings

Receivingandinspectionson

varieties,specsandquantity

ofpipingandpipingfitting

Fig.3.1InspectionProceduresChartfor

PipingandPipingFittings

⑶檢驗工藝

InspectionProcess

①管材、管件接收

ReceivingofthePipingandPipingFittings

管材、管件應依據施工進度計劃組織進貨和接收。管材、管件接收后，應按產地、規格、材質

和批號分別單獨存放，未經檢驗合格的管材、管件不得辦理入庫手續；

Thepurchasingandreceivingofpipingandpipingfittingsshallbeplanedandarrangedas

pertheconstructionschedule.Separatestorageisaccordingtotheirorigins,size,construction

materialsandlotNo.afterpipingandpipingfittingsreceived.Pipingandpipingfittingswhich

areunacceptablebyinspectingshouldnotbewarehoused.

大規格的管材、管件可直接在管道加工廠進行接收和存放，易丟失的管材、管件應設置庫房進

行接收和存放。

Thelargesizedpipingandpipingfittingscanbedirectlyreceivedandstoredinthe

prefabricationfactory.Thoseitemswhichmightbelosteasilymustbereceivedandstoredin

specialwarehouses.

②品種、規格、數量檢驗

InspectionsonVarieties,SpecificationsandQuantity

管材、管件應按產地或批號進行品種、規格和數量檢驗；

Thevarieties,specificationsandquantityofthepipingandpipingfittingsshallbeinspected

basedontheiroriginsorlotNo.forcompliance.

管材、管件的品種、規格和數量，應符合材料預算或采購計劃的要求。

Thevarieties,specificationsandquantityofthepipingandpipingfittingsshallbeconsistent

withthematerialsbudgetorprocurementplan.

③外觀質量檢驗

VisualqualityInspections

管材、管件的表面不得有裂紋、折疊、重皮等缺陷，銹蝕凹陷和機械損傷深度，不應超過管材、

管件相應標準厚度的負偏差。

Nodefectssuchascracks,foldingordoubleskinsshouldbeexpectedonthesurfacesof

thepipingandpipingfittings,theextentoftherusthollowsandmechanicaldamagesshould

notexceedtheminusdeviationsrequiredbyapplicablestandardthicknessforthepipingand

pipingfittings.

管材、管件的外徑、壁厚和不圓度等尺寸偏差應符合相應標準的規定要求。彎頭、異徑管和管

帽的尺寸偏差，應符合規范規定。

ThetoleranceofOD,wallthicknessandtheoutofroundnessofthepipingandpiping

fittingsshouldcomplywiththeapplicablestandards.Thedimensionaldeviationsforelbows,

reducersandcapsshouldmeettherequirementsoftherelevantcodes.

法蘭密封面的加工精度及粗糙度應符合制造標準；法蘭密封面、金屬環墊、纏繞墊片不得有徑

向劃痕、松散、翹曲等缺陷。

Themachiningprecisionandtheroughnessofthesealingsurfacesoftheflangesshould

complywiththerequirementsofthemanufacturingstandards;nodefectsasscratches,

looseningorwarpsareallowedonthesealingsurfacesoftheflanges,metalringsandspirally

woundgaskets.

螺栓、螺母的螺紋應完整，無劃痕、毛刺等缺陷。螺栓、螺母配合良好，無松動或卡澀現象；

Thethreadsoftheboltsandnutsshouldbeintegralwithnodefectsasscratchesorburrs.

Thenutsandboltsshouldbeproperlymatchedwithnoloosenessorblocking.

④材質核查

Materialsidentification

管材、管件的材質，應根據管材、管件的質量證明文件和管材、管件上的出廠標識進行核查確

認；

Theconstructionmaterialsofthepipingandpipingfittingsshallbecheckedandconfirmed

aspertherelevantqualitycertificatesandthecorrespondingex-worksidentificationsofthe

pipingandpipingfittings;

合金類管材、管件的材質，在進行質量證明文件和出廠標識核對確認的基礎上，必要時，應采

用光譜檢驗等方法進行核查確認。

Fortheconstructionmaterialsofpipingandpipingfittingsmadeofalloy,spectrum

inspectionsshallbeperformedbaseoncheckingofcertificateandmark,ifnecessary,forfurther

checksandconfirmationinadditiontothechecksandconfirmationofthequalitycertification

documentsandtheex-worksidentifications.

⑤質量驗證

QualityVerification(re-test)

管材、管件在進行品種、規格、數量檢驗和外觀質量檢驗及材質核查的基礎上，如設計或標準

對管材、管件有進一步的質量檢驗要求時，應按設計要求或標準規定，對管材、管件進行質量驗證。

Inadditiontotheinspectionsonthevarieties,specificationsandquantitiesaswellasthe

visualqualityinspectionandmaterialschecksofthepipingandpipingfittings,quality

verificationsshallbecarriedoutaspertheengineeringdesignrequirementsorapplicable

standardsincasefurtherqualityinspectionactivitiesarespecifiedintheengineeringdocuments

orstandards.

若到貨管材的爐批號與質量證明書不符或對其特性參數有異議時應按相應標準作校驗性檢驗

或追溯到產品制造單位，但在異議未解決前，該批管材不得使用。

ShouldinconsistencybetweentheheatNo.ofthereceivedpipingandtheattachedquality

certificatesbeobservedorelsetherebedoubtregardingthepropertydataofthepiping,a

checkoutinspectionshouldbeperformedaspertheapplicablestandardsortracebilitybackto

thevendorsbecarriedout.Andthislotofpipingshouldnotbeputintouseuntilthe

discrepanciesareproperlyhandover.

⑥產品標識和檢驗狀態標識

ProductIdentificationsandInspectionStatusMarks

質量驗證合格入庫后的管材、管件，應按品種、材質、規格和產地，分批進行合理擺放，并按

規定進行產品標識。

Pipingandpipingfittingswhichhavebeenputintostoragefollowinganacceptablequality

verificationshallbeproperlyarrangedbylotsfordifferentvarieties,constructionmaterials,

specificationsandoriginsandshouldbeidentifiedaspertherelevantstipulations.

入庫保管的管材、管件，應按批進行檢驗、試驗狀態標識。

ThepipingandpipingfittingsstoredinthewarehousesshallbeidentifiedbylotNo.to

indicatetheinspectionandteststatus.

⑦質量記錄文件

QualityRecordsDocuments

管材、管件質量證明書；

Thequalitycertificatesforpipingandpipingfittings;

管材、管件接收驗證記錄；

Receivingandverificationrecordsforpipingandpipingfittings;

管材、管件檢驗、試驗報告。

Inspectionandtestreportsforpipingandpipingfittings.

3.2閥門檢驗、試驗

InspectionsandTestsofValves

按國外標準制造的閥門，應按國外相應的檢驗標準進行檢驗。設計文件或顧客對閥門檢驗、試

驗有特殊要求時，應按設計文件或顧客的特殊要求進行檢驗、試驗。

Valvesmanufacturedasperforeignstandardsshallbesubjecttoinspectionsin

accordancewiththeapplicableinternationalinspectionstandards.Incasespecialinspection

andtestrequirementsforthevalvesarespecifiedintheengineeringdesigndocumentsor

requiredbytheclient,thentheinspectionsandtestsshallbecarriedoutincompliancewiththe

specialrequirementsoftherelevantengineeringdocumentsorasrequiredbytheclient.

⑴檢驗、試驗準備

PreparationsfortheInspectionsandTests

壓力管道工程用閥門，應專門成立閥門檢驗、試驗小組，統一進行檢驗、試驗。

Theinspectionsandtestsforthevalvesusedinthepressurepipingworksshallbe

performedbyaspecialinspectionandtestteamforintegratedinspectionandtestperformance.

閥門檢驗、試驗小組應由閥門檢驗、試驗作業人員、技術人員和質量檢驗人員組成。

Thevalveinspectionandtestteamshallcomprisethevalveinspectionandtestoperators,

techniciansandqualityinspectionpersonnel.

閥門檢驗、試驗前，必須編制閥門檢驗、試驗技術措施并設計制作相應的工裝設備。

Priortotheinspectionandtestactivities,itrequirestodeveloprelevanttechnicalmeasures

forvalveinspectionandtest,designandfabricatecorrespondingjigsandfacilities.

閥門檢驗、試驗前，必須進行檢驗作業技術交底；必要時，應組織作業前的專業技術培訓。

Atechnicalclarificationforinspectionoperationsshouldbeimplementedpriortothe

inspectionandtestactivities;ifnecessary,aprofessionaltechnologytrainingcourseshouldbe

conductedbeforethecommencementoftheinspectionandtestoperations.

閥門檢驗、試驗應設有獨立的作業場地，并劃分出待檢區、檢驗區、合格區和不合格區。

Anindependentfieldshallbeprovidedforthevalveinspectionsandtestsoperations.It

shallbedividedintofourzonesthatiswaitinginspectionzone,inspectionzone,acceptable

zoneandnon-acceptablezone.

檢驗、試驗場地應平整、照明應良好，并應保證道路暢通。

Thefieldusedforinspectionandtestpurposesshouldbeflatwithgoodilluminationand

freeaccess.

⑵檢驗、試驗流程

InspectionandTestProcess

檢驗、試驗工藝流程（閥門檢驗、試驗工藝流程見圖3.2）

Inspectionandtestprocessflow（fortheprocessflowforvalveinspectionandtest,referto

Fig.3.2.

閥「牧卜觀質S檢閥「理化檢強度試驗檢驗、試驗交付

查驗嚴密性試驗狀態標識安裝

不

合入

口

格

不合格格

品處置

圖6.3.2閥門檢驗、試驗工藝流程圖

Setupofvalve

inspection&testPreparationofDesign&Check&

teamtechnicalmanufacturingofconfirmationof

measures&jigs,preparationquality

implementationofofinspectionfieldcertification

technicaldocuments

Fig.6.3.2ProcessFlowforValveInspectionandTest

⑶閥門檢驗、試驗

ValveInspectionsandTests

①證明文件

CertificationDocuments

質量證明文件核查閥門必須具有出廠合格證和制造銘牌，銘牌上應標明公稱壓力、公稱通徑、

工作溫度、工作介質和閥號型號。

Thequalitycertificationdocumentsapplicableforchecksofvalvesmustbewithex-works

certificatesandmanufacturingnameplates,indicatingthenominalpressureandbores,

operatingtemperatures,servicesmediaandthemodelofthevalves.

合金鋼閥門及特殊閥門應有產品質量證明書。

Valvesmadeofalloysteelorspecial-purposevalvesmustbeattachedwithproductquality

certificates.

②外觀檢查

VisualInspection

閥門內應無積水、銹蝕和臟污，閥門兩端應設防護蓋保護。閥門外露的螺紋、閥稈和接管部分

應有保護措施。

Thereshouldbenowater,rustordirtinsidethevalves.Bothendsofthevalvesshouldbe

protectedwithprotectivecovers.Protectionmeasuresshouldhavebeenprovidedforthe

exposedthreads,stemsandnozzlesonthevalves.

閥門外表應無油漆脫落和損傷缺陷?，鑄件表面應平整光滑、無縮孔、毛刺、粘砂、夾砂、鱗屑、

裂紋等缺陷；鍛制加工表面應無夾層、重皮、裂紋、斑疤、缺肩等缺陷。

Nodefectsasfalloffofpaintordamagesontheoutersurfacesofthevalvesshouldbe

observed;hesurfacesofthecastingshouldbeflatandsmoothandfreeofshrinkagecavity,

burr,stucksand,sandcarry-over,scaleorcracks,etc.;theforgedsurfacesshouldbefreeof

suchdefectsasinterlayer,doubleskin,crack,scarorunfilledcorner,etc.

閥門的手柄或手輪操作應靈活輕便，開閉時不得有卡澀現象，閥桿的全開與全閉位置應符合要

求；閥桿和閥桿螺母、連接螺母的螺紋應光滑，不得有毛刺與開裂等缺陷。

Theleverorhandwheelofthevalveshouldbeofagilityforoperationswitheaseandthere

shouldbenoblockingduringtheopeningorclosingoperationsofthevalve.Thefullopening

andfullclosingpositionsofthestemshouldsatisfytherelevantrequirements.Thestemsand

thenutsonthestemsaswellastheconnectionnutsshouldbesmoothwithnodefectsasburrs

orcracking.

閘閥、截止閥、節流閥、調節閥、蝶閥、底閥等閥門應處于全閉的位置。旋塞閥、球閥應完全

處于未開啟位置，以防止灰塵沾染密封面。

Thevalvesasgatevalves,stopvalves,throttlingvalves,controlvalves,butterflyvalvesand

rootvalves,etc.shouldbeintheirfullyclosedpositions.Cockvalvesandballvalvesshouldbe

intheirunopenedpositionstopreventfromthecontaminationofsealingsurfacesbydust.

③結構尺寸檢查

CheckofstructureDimensions

閥門的結構長度、通徑、法蘭螺紋等應符合規定，對同型號、同規格的閥門按10%的比例進

行抽查，但抽查數量不得少于1個。

Thestructurallength,boresandthethreadsoftheflangesshouldcomplywiththerelevant

specifications.10%ofthevalvesofsamemodelandspecificationsaresubjecttobeingspot

checked,howeverthequantityofvalvestobespotcheckedshouldnotbelessthan1.

直通式鑄鋼閥門的連接法蘭密封面應相互平行，在每100mm的法蘭密封面直徑上，平行度偏

差不得超過0.15mm;直角式鑄鋼閥門的連接法蘭密封面應相互垂直，在每100mm法蘭密封面直

徑上，垂直度偏差不得超過0.3mm。

Thesealingsurfacesoftheconnectionflangesonthecaststeelthroughwayvalvesshould

beparallelwitheachotherandtheparallelismdeviationsoneach100mmdiameterofthe

sealingsurfacesshouldnotexceed0.15mm.Thesealingsurfacesoftheconnectionflangeson

thecaststeelright-anglevalvesshouldbeperpendiculartoeachotherandtheperpendicularity

deviationsoneach100mmdiameterofthesealingsurfacesshouldnotexceed0.3mm.

閘閥的閘板密封面中心必須高于閥體密封面的中心，當閘板密封面磨損時，關閉位置下降，但

閥體、閘扳密封面仍應完全吻合，閘板密封面磨損余量應符合有關規范的規定。

Thecenterlineofthesealingsurfacesofthegatesonthegatevalvesmustbeabovethatof

thevalvebody.Undertheconditionoftheclosingpositionbeingloweredduetotheabrasionof

thesealingsurfacesofthegate,thesealingsurfacesofthegateandvalvebodyshouldstill

remainwellfitted.Theabrasionallowanceofthesealingsurfacesofthegateshouldcomply

withtheapplicablespecifications.

④材質檢查

InspectionsonMaterials

合金鋼閥門的閥體應逐件采用光譜分析儀進行材質復查并做出標識，不符合要求不得使用。

Allthealloysteelvalvesbodiesshallbere-testonebyonebymeansofspectrum

analyzerforconstructionmaterialscomplianceandbeproperlyidentified.Nonconformities

shouldberejected.

閥門的填料、墊片材質應符合設計要求。對有特殊要求的閥門，其材質應進行1%抽查且不得

少于1個。

Theconstructionmaterialsofthepackingandgasketsofthevalvesshouldcomplywiththe

relevantrequirements.Forspecialpurposevalves,1%outofthetotal,butoneasminimum,

shallbespotcheckedformaterialcompliance.

易燃、可燃介質壓力管道的對焊閥門，應按批進行5%的硬度值抽查，且不得少于一個，硬度

值抽查應在坡口附近進行。

Forthebuttweldedvalveslocatedonthepressurepipelinescarryinginflammableor

combustiblefluids,5%outoftotal,butoneasminimum,shallbespotcheckedineachlotof

productsforhardnesscompliance.Thespotchecksforthehardnesscomplianceshallbe

carriedoutatacertainpositionaroundthebevel.

⑤閥門試驗一般規定

GeneralRulesfortheValveTest

下列管道用閥門應逐個進行殼體壓力試驗和密封試驗，不合格者不得使用：

Shellsofthefollowingvalveslocatedonthepipelinesshallbesubjecttopressuretestand

tightnesstestonebyoneandthosefailingtopassthetestsshouldberejected:

可燃流體管道的閥門；

Valveonpipelinescarryingcombustiblefluids:

輸送設計壓力大于1MPa或設計壓力w1MPa且設計溫度小于?29℃或大于1860c的非可燃流

體、無毒流體管道的閥門。

Valvesonpipelinestransportingnon-combustible,nontoxicfluidswithadesignpressureof

>1MPaorsuchfluidswithadesignpressureofw1MPabutwith<-29℃or>186℃design

temperatures.

輸送設計壓力w1MPa且設計溫度為-29~1869的非可燃流體、無毒流體管道的閥門，應從每

批中抽10%且不得少于1個，進行殼體壓力試驗和密封試驗。當不合格時，應加倍抽查，仍不合

格時，則該批閥門不得使用。

Forvalvesonpipelinestransportingnon-combustible,nontoxicfluidswithadesign

pressureof"1MPaandwith29℃-186℃designtemperatures,10%outofthetotal,butone

asminimum,shallbeselectedrandomlyfromeachlotofproductsforpressuretestandsealing

testforthevalveshells.Incaseofunacceptabletests,thespotcheckpercentageshouldbe

doubled.Incaseofstillfailingtopasstherepeatedtest,thenthislotofvalvesshallberejected.

閥門試驗前，應除去密封面上的油漬、污物，不允許使用防滲漏的涂層，但可進行無密封作用

的防銹處理。

Theoilanddirtpresentonthesealingsurfacesshouldbeproperlyremovedpriortothe

valvetestactivity.Applicationofcoatforanti-seepagepurposeisprohibited,howeveranti-rust

treatmentwithoutsealingeffectcanbeimplemented.

閥門試驗前，只允許一人以正常的體力進行關閉，當手輪的直徑2320mm時，允許兩個人進

行關閉。

Thevalvecanonlybeclosedbyonepersonwithnormalphysicalstrengthbeforethevalve

testactivityisperformed.Incaseofhandwheelwithadiameterof>320mm,twopersonsmay

beallowedtoclosethevalve.

裝有旁通閥的閥門，進行主閥強度和密封試驗時，對旁通閥也應進行強度和密封試驗。

Forthebypassvalves,strengthandsealingtestsshallalsobeperformedforsuchbypass

valvetogetherwiththemainvalve.

試驗用的壓力表，必須經檢定合格，其精度應不低于1.5級。安全閥試驗時，應選用0.5級或

1級精度的壓力表，量程應是試驗壓力的1.5至2倍。

Thepressuregaugesappliedinthetestoperationsmustbecalibricatedandacceptable,

theaccuracyofsuchgaugesshouldnotbelowerthanGrade1.5.Whilecarryingouttestsfor

safetyvalves,pressuregaugeswithanaccuracyofGrade0.5or1,andthespanshallbe

1.5-2timestestpressures

⑥強度試驗

StrengthTest

閥門在安裝前應按下列要求進行閥體的強度試驗：

Priortothevalveinstallation,strengthtestforthevalvebodyshouldbecarriedoutin

accordancewiththefollowingrequirements:

閥門應以1.5倍的公稱壓力進行液體壓力試驗；

Thevalveshallbehydraulictestedunderapressureof1.5timesthenominalpressure.

帶有蒸汽夾套的閥門，夾套部分應以1.5倍的蒸汽工作壓力進行強度試驗。

Forvalvesequippedwithsteamjacket,strengthtestforthejacketshouldbeperformed

underapressureof1.5timestheoperationpressureofthesteam.

閥門強度試驗介質采用潔凈工業水。對于奧氏體不銹鋼閥門，水的氯離子含量不得超過

25Ppm。

Cleanindustrialwatershallbeutilizedasthemediumforthestrengthtestofthevalves.For

thevalvesmadeofausteniticstainlesssteel,thechlorideioncontentinthewatershouldnot

exceed25ppm.

⑦閥門密封和上密封試驗

ValvetightnessTestandBackseatTest

起截斷作用的各類閥門應根據GB50235-97《工業金屬管道工程施工及驗收規范》相應規定

在強度試驗合格后進行密封試驗；具有上密封結構的閥門均應進行上密封試驗。

Theindividualtypesofvalveswithblockofffunctionsaresubjecttosealingtestasperthe

applicablespecificationsinGB50235-97(ConstructionandAcceptanceSpecificationsfor

IndustrialMetalPipingWorks)followingtheacceptablestrengthtest;valveswithbackseat

constructionshallbesubjecttobackseattest.

密封和上密封試驗應以公稱壓力進行，以閥瓣密封面不漏為合格。密封和上密封試驗的保壓時

間應符合表3.2的規定。

Thesealingtestandbackseattestshallbeperformedundernominalpressureandthetest

shallbedeemedacceptablewhenthereisnoleakageatthesealingsurfacesoftheflaps.The

pressureholdingtimeduringthesealingtestandbackseattestshallcomplywithTable3.2

密封和上密封試驗保壓時間表3.2

Table3.2PressureHoldingTimeDuringthetightnessTestandBackseatTest

最短試驗保壓時間(s)

MinimumPressureHoldingTime(s)

稱直徑

密封試驗

(mm)

SealingTest

NominalDiameter上密封試驗

非金屬彈性密封

(mm)BackseatTest金屬密封

Non-metallicElastic

MetallicSeal

Seal

<50101515

65~200153015

250-450206030

25003012060

密封試驗介質可用工業潔凈水進行試驗。對于奧氏體不銹鋼閥門，水的氯離子含量不得超過

25Ppm。

Cleanindustrialwatershallbeadoptedasthesealingtestmedium.Forthevalvesmadeof

austeniticstainlesssteel,thechlorideioncontentinthewatershouldnotexceed25ppm.

介質引入方向和施加壓力方向

MediumIntroductionDirection&PressureImposingDirection

規定了介質流通方向的閥門(如截止閥等)應按規定介質流通方向引入介質和施加壓力；沒有

規定介質流通方向的閥門(如閘閥、球閥、旋塞閥和碟閥等)，應分別沿每端引入