裝卸臂技術(shù)規(guī)格書(英文版)

..MARITIMETERMINALOFPETROCHEMICALCOMPLEXTechnicalSpecificationofLoadingArms<CNO:13303><CLIENTNO:11>ChinaH.<>September,2015Issuestatus:0CSep.20152014FORAPPROVALRev.DateDescriptionPrep’dChk’dRev’dApp’dCONTENTSTOC\o"1-2"\h\z\u1GENERAL11.1FIELDOFAPPLICATION11.2DEFINITIONOFITEMS12REFERENCEDOCUMENTS32.1APPLICABLECODESANDSTANDARDS32.2APPLICABLEPROJECTDOCUMENTS32.3EXCEPTIONSTOREFERENCEDOCUMENTS42.4DOCUMENTSORDEROFPRECEDENCE43SCOPEOFSUPPLY53.1EQUIPMENTSUPPLY53.2EXCLUSIONS73.3BOUNDARYLIMITS83.4ERECTIONWORKS94INSTALLATIONDATA94.1SITELOCATIONANDENVIRONMENTALCONDITIONS94.2AREACLASSIFICATION95GENERALSERVICECONDITIONS95.1PROCESS95.2OPERATINGANDDESIGNCONDITIONS96DESIGNANDCONSTRUCTION106.1MATERIALS106.2DESIGNREQUIREMENTS106.3SWIVELJOINTSANDSTRUCTURALBEARINGS126.4QUICK-CONNECT/DISCONNECTCARGOCOUPLERS<QCDC>136.5SPOOLPIECES136.6POWEREDEMERGENCYRELEASECOUPLINGS<PERC>146.7ACCESSORIES156.8OPERATINGANDCONTROLSYSTEMDESIGN176.9PAINTING,MARKING,PACKINGANDPREPARATIONFORSHIPMENT217INSPECTIONANDTESTS217.1MATERIALS217.2FABRICATIONCONTROLS217.3SHOPTESTS237.4SITETESTS257.5CERTIFICATIONTESTS268CRITERIA268.1LEAKAGE268.2PRESSUREDROP268.3CONSUMPTIONSOFSTEAM268.4LOADSONSHIPCROSSOVERFLANGES269Guarantee27..GENERALThisspecificationcoverstheminimumrequirementsforMarineLoadingArmsforuseinliquidammoniaandmoltensulfurserviceincludingdesign,manufacture,assembly,control,shoptests,sitetestsandperformances,tobeinstalledintheMARITIMETERMINALOFMORONPETROCHEMICALCOMPLEX.Therequirementsforquickconnect/disconnectcouplers<QCDC>,poweredemergencyreleasecoupling<PERC>andloadingarmcontrolpowersystemsarealsocovered.Inadditiontothedescriptioninthisspecification,relatingdatasheets,drawings,specifications,codesandstandardsshallbereferredtoconductthedesign.Itshouldbenotedthatthisspecificationisnotintendedtoprecludetheuseofnewmaterials,designsortechniqueswhichcanbedemonstratedtobesuitablefortheintendedservice.ThisspecificationisacontractualdocumentbetweenPURCHASERandSELLER.ItdefinestheequipmentandservicesincludedintheSELLERscopeofsupply.ThisspecificationisderivedfromOCIMF<OilCompaniesInternationalMarineForum>"Design&ConstructionSpecificationforMarineLoadingArms".Thedesign,manufactureandtestingoftheMarineArmsshallbeinfullcompliancewiththisspecification.Sellershalladviseequipmentloadrequirementsinthetechnicaltenders.FIELDOFAPPLICATIONLiquidammoniaarmitem120-00-0-LA-01isintendedtotransferliquidammoniafromtheonshoretanktotheshiptanks.Liquidammoniaarmisconnectedviaashutdownvalvetothemainammoniapipeline.Thisarmshouldhavevapourreturnpipelinetoreturnthevapourtothevapourreturnpipeline.Themoltensulphurarmitem120-00-0-LA-03isintendedtotransfermoltensulphurfromshiptoonshore.DEFINITIONOFITEMSOCIMFOilCompaniesInternationalMarineForumIECInternationalElectrotechnicCommitteePERCPoweredEmergencyReleaseCouplingERSEmergencyReleaseSystem<includesthePERC>.QC/DCQuickConnect/DisconnectCoupler.JETTYCONTROLROOMLocalControlRoomonJetty"MarineArms",asusedinthisspecification,shallmeanallmetalselfsupportedmarineloadingorunloadingarmswitharticulatedswiveljointsinclusiveof,wherespecified,quickconnect/disconnectcouplers,powersystem,operationcontrols,rangecontrolsystem,purgesystem,spoolpieces,emergencyreleasesystem,monitoringtoolsandjacks,ifrequired.The"OperatingEnvelope"forasingleloadingarmisthatvolumeinspace,requiredtooperatetheunitforalloftheshipsmanifoldlocationsbasedon:elevationchangesfortide,draftorship’sheaveduetowaveaction,changesinhorizontalpositionduetoshipswayandsurge,maximumandminimummanifoldspacingwhenoperatingsimultaneouslywithotherloadingMarineArms,singlearmoperation.The"RatedTemperatures"oftheMarineArmor,ifapplicable,partsthereof,aretherangeoftemperaturesestablishedbytheextremesof:thetemperaturerangeofcargotemperaturesduringoperations,therangeofarmtemperaturesduetoambientconditionsresultingfromambienttemperaturesandsolarradiationheat.REFERENCEDOCUMENTSAPPLICABLECODESANDSTANDARDSInparticular,followingcodesandstandardsformpartofthisspecification:ASMEB31.3:PressurePiping.ASMEB36.10:Weldedandseamlesswroughtsteelpipe.ASMEB36.19:StainlessSteelPipe.ASTMforthelistedmaterial.ASMEcode,sectionV:Non-destructiveExamination.ASMEcode,sectionVIII,division1:RulesforConstructionofPressureVessels.ASMEcode,sectionIX:WeldingandBrazingQualifications.OCIMF:DesignandConstructionSpecificationforMarineLoadingArms.IEC34.Ratingandperformanceofelectricmotors–ApplicabletomotoroperatedvalvesIEC73.Colorofindicatorlights,pushbuttons,annunciatorsanddigitalreadouts.IEC529.Degreesofprotectionprovidedbyenclosures.IEC584.InternationalthermocouplereferencetablesIEC617.GraphicSymbolsforelectronicdiagramsISASS-1.InstrumentationinSymbolsandIdentificationUnlessstatedotherwise,onlythelatesteditionsoftheabovementionedlaws,regulations,codesandstandardsshallbeused.APPLICABLEPROJECTDOCUMENTS13S030301AMMONIALOADINGARMDATASHEET.13S002SULFURUNLOADINGARMDATASHEET13S00101BERTH-2EQUIPMENTLAYOUT13S0306EngineeringSpecificationforPainting13S007EngineeringSpecificationforHotandPersonnelProtectionInsulationDesign13S008EngineeringSpecificationforColdandAnti-sweatInsulationDesign13S0002EngineeringSpecificationforPipingMaterials13S001P&IDFORAMMONIALOADING13S02P&IDFORSULFURUNLOADINGEXCEPTIONSTOREFERENCEDOCUMENTSItshallbetheSELLERresponsibilitytocheckthatthedesign,purchase,manufacture,assembly,control,testandcertificationofallitemsincludedinthesupplyareinconformitywiththerequirementsofdocumentslistedintheApplicableDocuments.Foreachapplicabledocument,SELLERshallsubmittoPURCHASER/OWNERforreviewalistofdeviationstospecifications,otherwisethesupplyshallbeconsideredasfullycomplyingtospecifications.Thislistofdeviations,ifany,shallbeperiodicallyup-datedduringtheperformanceofthecontract.WhenSELLER'sinternalstandardisequivalenttorelevantspecification,itmaybeproposedforPURCHASER/OWNERreviewandfinalapprovalbyOWNER.DOCUMENTSORDEROFPRECEDENCEAnyconflictsbetweentherequirementsofthisspecification,relatedspecificationsanddrawingsetc.,shallbereferredtothePURCHASER/OWNERforclarificationbeforeproceedingwiththemanufactureorprocurementoftheaffecteditem.NothingcontainedinthisorrelatedspecificationsshallbeconstruedasrelievingtheSELLERoftheresponsibilityfordesigningandconstructingtheequipmenttomeetthespecifiedconditions.SCOPEOFSUPPLYEQUIPMENTSUPPLYTheSELLERshallsupplyallequipmentandmaterialsnecessaryforthecompleteinstallationofMarineArmsenablingshipstobesafelyandcontinuouslyloadedorunloaded.SELLERshallalsoberesponsibleforsitesupervisionoferection,pre-commissioning,commissioning,startupandperformancetesting.TheSELLERshallsupplyMarineArmsinthequantityandwithcharacteristicsspecifiedinthedatasheet.Theextentofsupplyshallincludebutnotlimitedtothefollowing:TheMarineArmscompletewithbaseandrisers<includinganchorbolts,baseplatetemplate,swiveljointsandcounterbalanceweights>.ThevolumetricratioAllnecessarydocumentationtodemonstratetothePURCHASER,theOWNERandGovernmentDepartmentsthatthedesign,materials,fabrication,erectionandcontrolsatisfythespecificationsandstatutoryrequirementsAllinstrumentationandcontrolsincludinglocalcontrolpanel,portableremoteradiocontrolunit,controlcabinetsandlicensedsoftwareforPLCmaintenanceVisualisationsystem,ifrequiredindatasheetAllinterconnectingwiring,cables,cabletrays,etc.Allrequiredhydraulicsystemsincludingpowerpacks,accumulatorscylinders,etc.Allinterconnectinghydraulicpipework,valvesetc.JacketsteamtracingandinsulationformoltensulphurMarinearm.Quickconnect/disconnectcargocouplers<QCDC>.CouplingspoolpiecestosuitshipmanifoldsofspecificsizePoweredemergencyreleasecouplings<PERC>withemergencyblockvalvesforammonialoadingarm.Completeaccess/supportstructureincludingallladders,platforms,stairwaysetc.Shopfinishpainting,galvanising,passivefireprotectionandinsulation.Supportjack<adjustable>attripleswiveljointfortheshipmanifoldinterface<ifrequired>.Straycurrentprotectors.Inspectionandtesting.Packingandpreservation.Liftingbeams,spreaderbeamsandslingsforinstallationoftheequipment<ifrequired>.StormlocksBlindflanges/coverstosuitQCDCcoupling.DummyflangesforERStestingandmaintenance.Acompletesetofallspecialtools,etc.,requiredfortheinstallation,maintenanceandrepairofanyequipmentinthesupply.Initialfillofhydraulicoilandanynecessarylubricant.Plusanyspecialfluidetc,requiredforflushingthehydraulicsystemduringcommissioning.1"nitrogenpurginglineconnectedtoarmequippedwithonecheckvalve.Groundingandearthingfacilities.Weathercoverforlocalcontrolpanel.Identificationplates.Sparepartstocoverprecommissioning,commissioningandstart-upperiod.2yearsoperationalsparesTrainingofoperatorsCivilguideengineeringactivitiesforthedesignbyPURCHASERoftheconcretesupports.InadditionthefollowinginformationshallbeincludedintheSELLERSbid:MarkedupPURCHASERSDataSheetsG.A.drawings.Pressuredropcurveswithsupportingtableofdata.VendoristosupplydetailedoperatingenvelopeEXCLUSIONSConcretefoundationsErectionworksPlantlighting/earthing.ElectricalpowersupplyincludingUninterruptedPowerSupply<UPS>andwiringtoSELLERSsuppliedterminalboxes.Pipeworkandpipinguptoloadingarmrisersanddrainconnections.TheSELLERshalllocatetheseitemslocaltograde.JettyControlRoomandCentralControlRoom.ControlcablingfromthelocalcontrolpaneltotheunitcontrolpanelintheJettycontrolroom.Localstop/startpush-buttonstationsforeachmotor.Motorstartersandisolators.CableglandsforcablessuppliedbySELLER.BoltingandgasketsforflangedconnectionsatSELLER/PURCHASERinterfacepoints.LightningprotectionofJettyequipment.BOUNDARYLIMITSTheMarineArmsaremountedonverticalcolumnsmountedontheJetty.Thepipingboundarylimitforeacharmisattheflangeconnectionattheelevationabovetheoperationplatform.Thestructuralboundarylimitisattheundersideofthecolumnbase.TheHydraulicPowerPacksandlocalgrademountedjunctionboxesarelocatedatthebaseoftheverticalcolumn.Theelectricalandinstrumentboundarylimitsareatterminalslocatedinthelocaljunctionboxesforthecablesfromjettycontrolroom.Thestructuralboundarylimitislocatedattheundersideofthepowerpackbaseplate.TheMarineArm/shipboundarylimitisdefinedbytheoperatingenvelopeandtheflangeconnectionwhichinterfaceswiththeshipmanifoldconnection.TheLocalControlPanelwillbelocatedontheoperationplatform.TheelectricalandinstrumentboundarylimitsareattheterminalslocatedintheLocalControlPanelforthecablesfromjettycontrolroom.Thestructuralboundarylimitislocatedattheundersideofthecontrolpanel.TheUnitControlPanelwillbelocatedintheJettyControlRoom.TheelectricalandinstrumentboundarylimitsareattheterminalslocatedintheUnitControlPanel.Thestructuralboundarylimitislocatedattheundersideofthecontrolpanel.ERECTIONWORKSEquipmentshallbedeliveredbySELLERwithasmuchprefabrication/assemblyworkcompletedaspossibleinordertoreducePURCHASERSerectionworks.INSTALLATIONDATASITELOCATIONANDENVIRONMENTALCONDITIONSReferto"LoadingArmDataSheets"。AREACLASSIFICATIONMarineArmsarelocatedinhazardousarea.Seeequipmentdatasheetsforclassification.GENERALSERVICECONDITIONSPROCESSMarineArmsareintendedfortransferofthecargobetweenshipandonshorestoragetanks.Liquidammoniaarmisintendedtotransferliquidammoniafromtheonshoretanktotheshiptanks.VapourreturnpipelineofLiquidammoniaarmisinternedtoreturnthevapourtothevapourreturnpipeline.Themoltensulphurarmisintendedtotransfermoltensulphurfromshiptoonshore.OPERATINGANDDESIGNCONDITIONSRefertoMarineArmsPackageDatasheets.DESIGNANDCONSTRUCTIONMATERIALSASTMmaterialspecification,orequivalent,shallbeproposedbytheSELLERforreviewandapproval.Thefollowingmaterialsshallbepreferablychosen:Incontactwithammonialiquid&vapour:<A333Gr.6>Incontactwithmoltensulfur:<A106Gr.B>Hydraulictubing&fittings:Type304LorType316LAluminiumshallnotbeusedfortheMarineArms.SwiveljointsandfluidcarryingpartsofcouplersshallbeconstructedofmaterialswhichdonotcausegalvanicactionwiththepipeusedintheMarineArm.Thesealringmaterialshallbesuitableforthefluidtobepumpedandforexposuretoambientanddesigntemperature.AllexposedpartswhichmoverelativetoeachotherforthefollowingMarineArmcomponentsshallbecorrosionresistanttomarineatmosphere,particularly:manualblockvalvesinthehydraulicsystem,hydrauliccylinderandmotors,SwiveljointsPurgingconnections.DESIGNREQUIREMENTSGeneralAllequipmentshallbedesignedforaminimumdesignlifeof25years.SELLERshouldprovidealistoftheanticipatedmajorcomponentsrequiringreplacementtofulfilthisrequirement.MarineArmsandancillaryfacilitiesshallbedesignedtohavesufficientresistanceforthevariousloadscombinationsspecifiedinthisspecification.Allcomponentsshallbefullyproveninfieldservice.ThestructuralpartoftheMarineArmsshallbeindependentoftheproductcarryingpipe.LayoutandarrangementThedesignshallbesuchthatMarineArmscanbefullyopenedatfullcapacity.MarineArmlengths,workingrange,clearancesandlocationofthetrunnionswivel-jointconnectionshallberesolvedbytheSELLER,basedontheoperatingenvelopedeterminedonthebasisofthedesigndatagiveninthedatasheets.LengthsandclearancesshallbedefinedonthebasisthatMarineArmsmaybeoperatedsinglyandincombination,asindicatedinthedatasheet,forbothmaximumandminimummanifoldspacingasspecified.Clearancesshallnotbelessthanfollowingvalues:0.30mminimumclearancebetweenanypartofanoperatingMarineArmandfixedobjects,0.60mminimumclearancebetweenanypartsofadjacentMarineArms.Adiagramforworkingrange<withalarmsteps>shallbefurnishedbytheSELLER.InthestoredpositionnoportionofthearmshallextendbeyondtheUnloadingplatformface.TherangeofMarineArmmovementsshallallowtheoutboardjoint<tripleswivel>tobepositionedontheplatformformaintenanceallowingaminimumof1mclearspacearoundtheoutboardjoint.Laddersandplatformsshallbeprovidedforaccesstothetrunnionandapexswivelsunlessspecifiedotherwiseinthedatasheet.Maintenanceaccessandladderswithsafetydevicealongrisersandinboardarmshallbeprovided.StressanalysisSELLERshallanalysestressesanddeflectionsintheMarineArmandshipmanifoldsinallappropriatearmconditionsandspecifiedcounterweight.TransientthermalstressesWhenspecifiedinthedatasheet,inadditiontothestressanalysesundersteadythermalloads,SELLERshallperformastudyofthermalstressesintransientconditionsduringMarineArmscoolingdownoperations.Thermalstressesintransientconditionsshallnotexceedthe"AllowableStressforThermalShocks"<ASTS>.Thermalstressesshallbeanalysedasfollows:Whenthegeometryoftheequipmentorofoneofitscomponentswhichcanbetreatedindependentlyfromtheunit,issimpleie.incaseof"thinshell"typestructures,itisacceptable,onthebasisofasimplifiedhypotheses,tofindananalyticalsolutiontotheequationsgoverningtheevolutionofthermalstresses,Whentheequipmentgeometryiscomplex,itisrecommendedthatthethermalstressesareacalculationusingtheFiniteElementMethod.Itisrecommendedthatcalculationresultsbevalidatedagainstmeasurements,orbycomparison,withaknownsolution.SWIVELJOINTSANDSTRUCTURALBEARINGSLiquidammoniaswiveljointshallbecartridgetype.Whenlubricated,structuralswiveljointsshallbecapableofbeinglubricatedwithoutdismantling.Lubricationpointsshallbereadilyaccessibleinboththestoredandmaintenancepositions.Alubricantreliefportshallbeprovidedtosafeguardagainstoverpressurisation.Exceptfortheoutboardjoint<triple>swivel,allswiveljointassembliesshallhavedevicestopermitrepackingwithoutdismantlingmajorsectionsofMarineArms.Theswiveljointsshallhaveballorrollerbearings.Theoutboardjoint<triple>swivel,whererequired,includingsupportdevice,couplerandvalving,shallbebalancedsothattheoutboardflangeremainsintheverticalplaneforallMarineArmattitudes.Swivelsforliquidammoniaserviceshallbedesignedsothatexternalwatercannotpenetrateandfreezeinthejointsbetweenrotatingpartsoftheswivel.SwiveljointsmechanicaldesignshalltakeintoaccountthesafetyfactorsdefinedbyPara.5.5and5.6ofOCIMF"DesignandConstructionSpecificationforMarineLoadingArms".QUICK-CONNECT/DISCONNECTCARGOCOUPLERS<QCDC>MarineArmsshallbeequippedwithQuickConnect/DisconnectCouplersforshipconnectionsasspecifiedintheMarineArmPackagedatasheets.Minimum/maximumclosuretimesoftheQCDCcouplershallbeasperOCIMFTable11.Aligningandcentringdevicesshallbefurnishedbasedonsizesoftheflangestowhichthecoupleristoconnect.TheflangeratingoftheQCDCcouplershallbeASMEClass150.TheQCDCcouplershalladapttootherthanASMEflanges.TheQCDCcouplershallholdaflangecovertopreventingressofdirtandwaterwhentheMarineArmisdisconnected.ThiscovershallremainattachedtotheQCDCcoupler<whentheQCDCcouplerisopenedaccidentally>,butneednotbedesignedtowithstandtheloadingarmfluiddesignpressure.LubricationofallmovingpartsshallbepossiblewithoutdismantlingtheQCDCcoupler.ThestrengthoftheQCDCcouplershallbebasedonPara.6.5ofOCIMF"DesignandConstructionSpecificationforMarineLoadingArms".Thedesigngaugepressureshallbethemaximumof19kg/cm2orthespecifieddesignpressure.SPOOLPIECESSpoolpiecesshallbesuppliedbytheSELLERtoallowconnectionofMarineArmstovariousshipmanifoldconnections.POWEREDEMERGENCYRELEASECOUPLINGS<PERC>TheAmmoniaLoadingArmshallbeequippedwithahydraulicallypoweredemergencyreleasecoupling<PERC>neartheoutboardendoftheArmfittedbetweentwoballvalveshydraulicallyoperated.ThePERCshallpermitacleanandsafeseparationoftheAmmoniaLoadingArmfromtheshipmanifold.ItisacceptablethatthesectionofthetripleswiveloutboardoftheemergencyreleasecouplingremainsattachedtotheShipmanifold,toberecoveredlater.Accumulatorsorotherhydraulicmeansshallbeprovidedtoenableemergencyreleaseintheeventofelectricpowerfailure.Intheeventofhydraulicorelectricpowerfailure,thePERCshallfailsafeandremainsecurelyclosed.ThePERCshallbeautomaticallyactivatedwhenthearmreachesbeyondthelimitsoftheworkingrangereducedbyasafetymarginspecifiedinthedatasheet.ProvisionshallbemadeinthecontrolsystemtomoveautomaticallyandtoholdallMarineArmsclearoftheShipdeckandsideonactuationofthePERC.ThePERCshallbecontrolledfromthejettycontrolroom,designatedoutsidecontrolpointsandbyhardwiresignalfromterminalESDsystem.Thecontrolshallbeprotectedagainstaccidentaloperation<e.g.bysafetypinorcover>.Thereshallbenoadditionalmanualmeansavailablefortriggeringthereleaseoftheemergencyreleasesystem.ThearrangementofthePERCattheoutboardendofthearmshallbesuchthatthePERCandarmcomponentsremainingontheShipafteremergencyreleasewillnotfallontheShipdeckormanifoldserviceplatform.ThehydrauliccylinderoperatingtheemergencyreleasethePERCshallbedoubleacting.ThestrengthoftheERSshallbebasedonPara.ofOCIMF"DesignandConstructionSpecificationforMarineLoadingArms".Inthiscase,thedesigngaugepressureshallbethemaximumof19kg/cm2orthespecifieddesignpressure.DuringthereleaseoftheEmergencyReleaseCouplingthehydraulicpowersystemshallautomaticallyblocktheslewingmovementoftheMarineArmsduetowindloadandconsequentlypreventcollisionofthedisconnectedMarineArms.HydrauliccircuitforPERCcontroltobeequippedwithamanualoperatedlockingvalveinstalleddirectlyattripleswivelassemblytobeopenedattimeofconnectionandclosedattimeofdisconnection.Acontrolswitchistobeprovidedtodetectitsposition.Positionclosed:ThemanoeuvringoftheMarineArmispossible.DisconnectionofthePERCduringmanoeuvringorrestpositionoftheMarineArmisnotpossible.Positionopened:Freewheelisactivated,thedisconnectionofthePERCispossibleincaseofemergencyafterclosingoftheballvalves.Thetrappedvolumebetweentheballvalvesshallbeminimisedtolimitthespillincaseofrelease.ValvesshallbefiresafecertifiedinaccordancewithAPI607,ISO10497orBS6755andbesuitablefortheservice.HydraulicpipingshallcomplywiththefireproofingrequirementofISO10497orequivalent.TheERSdoubleballvalvesshallbehydraulicallyactuatedandthedesignclosuretimeshallbe5

seconds,unlessotherwisespecifiedinthedatasheet.ThecompletedisconnectionsequencefrominitiationtodisconnectionofthePERCshallnotexceed7seconds<SELLERtoconfirm>witha5secondsvalveclosuretime,unlessotherwisespecifiedindatasheet.ThePERCreleasemechanismshallbeabletoensurecleanseparation,break-outofanyiceformation,andshallbecapableofbeingremovedfromtheShipandreassembledinthecoldcondition.ACCESSORIESStormlocksAmechanicaltiedowndeviceremotelycontrolledmanuallyshallbeprovidedtokeeptheinboardMarineArmfrommovinginthestoredpositionduringhighwinds.EithermechanicalorhydrauliclocksshallbeprovidedtorestrictmovementofoutboardMarineArminthestoredposition.Hydrauliclockingshallbeaccomplishedbyusingseparatedmanualvalvesandnotthesystemcontrolvalves.InthestoredandmaintenancepositionstheentireMarineArmshallbelockedagainstslewing.ThestoredpositionlockingmechanismshallbedesignedtopreventthepossibilityofthemechanismengagingwhiletheMarineArmisintheoperatingmode.Supports<Jacks>PermanentlyattachedadjustablesupportshallbeincludedonallMarineArmswherethemanifoldstressesexceedthelimitsdefinedinstressanalysis.ThemountingofthesupportontheMarineArmshallbesuchthatthesupportisfreetomovewiththepitchingmotionoftheShiptowhichthearmisconnected.StraycurrentsprotectorsInsulatingflangesshallbeinsertedneartheoutboardendoftheMarineArmtoelectricallyisolatetheShipfromtheMarineArm.Theflangefaceshallnotbeinapermanentverticalorientation.Insulatingmaterialsusedshallensurethattheflangesareimpervioustomoistureandarecompatiblewiththeproductpropertiesandtemperaturesinvolved.Thegasketusedintheinsulatingflangesshallprojectapproximately3mmintotheboreoftheflange.Theannularspaceattheflangeoutsidediametershallbefilledwithnonconductivematerialandthenwrappedtopreventpenetrationofmoisture.Paintshallnotbridgetheflangeannularspace.Theelectricalresistanceoftheinsulatingflangeshallbegreaterthan10

000ohm,measuredbeforeandafterMarineArminstallation,betweentheshoresideflangeandtheoutboardendoftheMarineArmwhenfreelysuspended.ThePURCHASERshallspecifyamethodofmeasuringtheelectricalresistance.Afterhydrostatictesting,installationandinoperation,the