DLAI4145.25 AR70068 NAVSUPINST 4440.128D AFJMAN23227(I) MCO10330.2D 16Jun00 STORAGEANDHANDLINGOFLIQUIFIEDANDGASEOUSCOMPRESSED GASESAND THEIRFULLANDEMPTYCYLINDERS [Thispublicationhasbeenrevisedsignificantly andmustbereviewedinitsentirety.] A.REFERENCES 1.DLAR4145.25/AR70068/NAVSUPINST4440.128C/MCO10330.2C/AFR 6712,16JAN90. 2.DoD4140.1R,DODMaterialManagementRegulation B.PURPOSE.Thisinstruction: 1.SupersedesDLAR4145.25/AR70068/NAVSUPINST4440.128C/MCO 0330.2C/AFR6712 2.Prescribesproceduresandresponsibilitiesforthereceipt,storage,use, inspection,transportation,andhandlingofcompressedgasesandtheircylinders forallDoDcomponents,installationsandactivities. Theseproceduresare designedtoassureoptimumuseofboththegasesandthecylindersbyallDoDand DLAactivities. C.APPLICABILITYANDSCOPE 1.TheprovisionsofthisInstructionareapplicabletotheDepartmentoftheArmy (DA),theDepartmentoftheAirForce,theDepartmentoftheNavy,theMarine Corps,andtheDefenseLogisticsAgency(DLA)whichwillbereferredto collectivelyasDoDComponents.Thisinstructionappliestoallworldwide DoDlocationsthatreceive,store,issue,use,maintain,recondition,andperform associatedserviceswithoronthecompressedgasesandtheircylindersmanaged bytheDefenseSupplyCenterRichmond(DSCR)andtheDefenseSupplyCenter Philadelphia(DSCP).Whenthereisaconflictbetweentheprovisionsofthis instructionandthehostnation,themorestringentrequirementsshallapply.

2.Aerosoltypecontainerscurrentlyinthesupplysystemarenotconsideredin thisInstruction.WhentransportingaerosolcontainersrefertoTitle49Codeof FederalRegulations(CFR).FlammableaerosolsshouldbestoredasClass1 flammableliquidsasstatedinNFPA30,FlammableandCombustibleLiquids Code. 3.DLAI4145.25/AR70068/NAVSUPINST4440.128D/AFJMAN23 227(I)/MCO10330.2Dhasbeencoordinatedwith,andapprovedby,theArmy, Navy,AirForce,andMarineCorps. 4.ThisInstructionmaybesupplementedatthemajorcommand,installation,and activitylevels. D.DEFINITIONS 1.CompressedGas.Thetermcompressedgasisdescribedasfollows: a.Anymaterialormixturehaving,inthecontainer,anabsolutepressure exceeding40poundspersquareinch(40PSIA)(25poundspersquareinch gauge(25PSIG))at70degF. b.Regardlessofthepressureat70degF,havinganabsolutepressure exceeding104PSIA(89PSIG)at130degF. c.Anyliquidflammablematerialhavingavaporpressureexceeding40PSIA (25PSIGat100degFasdeterminedbyAmericanSocietyforTesting Materials(ASTM)D323,TestforVaporPressureofPetroleumProducts (ReidMethod),latestedition. 2.Cylinder.Acompressedgascylinderisapressurevesseldesignedforthe storageandtransportationofacompressedgasatpressureshigherthan40PSIA (25PSIG),withatubularshapeandcircularcrosssection.Thisdoesnotincludea portabletank,amultiunittankcartank,acargotank,oratankcar(Title49CFR, Section171.8). 3. 3. Additionaldefinitionsareprovidedinenclosure1ofthisInstruction. E.PROCEDURES 1.Thecompressedgasesusedby DLAandDoDactivitiesaremanufacturedbyboth commercialproductionplantsandmilitaryfieldactivities.Themanufacturingand qualityrequirementsforeachgasproductareprovidedinMilitary,Federal,and commercialspecifications.AllDLAandDoDactivitieslocatedinthecontinental UnitedStates(CONUS)arerequiredtopurchasetheirgasproductsfromcommercial sources.Eachcontractoristoprovidethedesiredgasproductandthenecessary servicestoretestandreconditiontheapplicablecylinderstoensuretheyremainin safeandserviceablecondition.Overseasmilitaryrequirementsaresatisfiedby shipmentofthedesiredproductsfromCONUS,bylocalmanufactureoftheproduct

onsitebythemilitaryactivity,orbypurchasingthedesiredproductsandservices fromthehostcountrycommercialsuppliers. 2.Verificationofthequalityofthepurchasedormanufacturedproductisconducted atthesiteofmanufactureorattheproductdistributor'swarehouse.Necessarytesting isperformedbythesupplier'spersonnelunderthesurveillanceofaGovernment representative,orrecordsoftheexaminationandtestsaremaintainedbythesupplier andmadeavailabletotheGovernmentuponrequest.Inspectionand/orsupplier verificationtestingisconductedunderthesurveillanceofaGovernmentQuality AssuranceRepresentative(QAR).Thequalityofthegasproductcontainedunder pressureinacompressedgascylinderwillnotchangeundernormalstorageand handlingconditionshowever,theconditionofthecylindermaydeteriorateand renderthecylinderunsafeforfurtheruse.Proceduresforthepreventionand/or detectionoftheseconditionsareprovidedanddefinedinenclosures1and2tothis document. 3.Gascylinderspurchasedforthestorageandshipmentofcompressedgasproducts forDLAandDoDactivitiesareprocuredinaccordancewithMilitaryand/orFederal specifications.ThesespecificationssupplementUnitedStatesDepartmentof Transportation(DOT)manufacturingrequirementswiththenecessarymilitarydesign andmarkingrequirements.ThebasiccylinderismanufacturedtothedesiredDOT specification(e.g.,3AA,4BA,8A),thenassembledintoacompletecylinderwiththe desiredMilSpecvalve,colorcode,andproductidentificationdesignatingitsspecific use.Thefabricationofthecylinderbythemanufacturerandtheinitialhydrostatic testingandrecordingofdatabyanindependentinspectionagencyareunderthe surveillanceofaGovernmentQAR.Cylindersmaybepurchasedandsentdirectlyto acompressedgasfillinginstallationforimmediateuse,ortheymaybeshipped directlytoastockordepotstoragefacilitywheretheymayremainforan undeterminedlengthoftime.Duringanystorageperiod,whetherthecylinderisfull orempty,itsconditionmaydeteriorate,causingittobecomeunsafeforfurtheruse. Allpersonswhohandle,use,andfillcylindersmustbeabletorecognizethese deterioratingconditionsandinitiateactiontohavethecylindersreconditionedor removedfromservice.Anypersonofferingacompressedgasforshipmentmust assurethatthecylinderbeingusedforthatshipmentmeetsalldesignand manufacturingrequirementsoftheapplicableFederal,Military,andDOT specificationsandthatithasbeenrequalified(retested)andreconditionedin accordancewithMILSTD1411,InspectionandMaintenanceofCompressedGas Cylinders,andDOTTitle49CFR,Transportation.Thesedocumentsandprocedures arediscussedindetailinenclosure1ofthisInstruction. 4.Certainsafetyprecautionsmustbeexercisedinthestorage,handling,anduseof compressedgasesandofthecylindersinwhichtheyarecontained.Theprimary precautionsforcompressedgasesusedbyDoDactivitiesareprovidedinenclosure1 ofthisdocument.Inadditiontowrittenprecautions,theDoDhasestablishedacolor codingsystemthatidentifiestheprimaryandsecondarysafetyhazardspresentedby eachcompressedgasormixtureofcompressedgases.Thissystemisoutlinedin

MILSTD101B,ColorCodesforPipelinesandCompressedGasCylinders.The systemenablesthegasuserorcylinderhandlertoimmediatelyidentifythetypeof gasandthehazardousnatureofthematerialcontainedineachcylinder(e.g., flammable,nonflammable,corrosive,poisonous,oxidizing).Additionalinformation andfurtherguidancemaybeobtainedfromthepreparingandcoordinatingactivities ofthisregulation,thelocalsafetyofficeorfiredepartment,themanufacturerofthe specificcompressedgas,theCompressedGasAssociation,theHazardousMaterials TechnicalCenter(HMTC),ortheDOT. 5.Cleaning,internalandexternal,isperformedbythecommercialsupplierand/or vendoratthetimeofretestingandreconditioningoratthetimethecylinderisfilled. Shouldexternalcleaningbecomenecessaryduringstorage,materialsusedtoclean thecylindersmustbecompatiblewiththegasorliquidtobeputintothecylinders,or thegaspreviouslyintheemptycylinders.Forinstance,1,1,trichloroethylenecan explode. F.RESPONSIBILITIES 1.HeadquartersDefenseLogisticsAgency,DefenseLogisticsSupportCommand (DLSCLD)willberesponsibleformonitoringandstaffsupervisionoftheDLA programforstorage,handling,anduseofcompressedgases(liquefiedandnon liquefied)incylindersandfortheoverseasprogramforhydrostatictestingand reconditioningofU.S.Governmentownedcylinderatlocationsthroughoutthe world. 2.FieldActivities a.TheCommandersofDGSCandDSCPwill: (1)Ensurethequalityofthecompressedgasesandgascylindersthatare procuredormanaged. (2)ProvideguidanceasneededtoallDLAandDoDactivitiesthatuse, handle,maintain,retest,recondition,andorstorecompressedgasesto maintainanadequateandconstantsafetyandqualitycontrolprogram. (3)ReviewthequalitycontrolandrelatedtechnicalaspectsofthisInstruction andits2enclosuresannuallyand,incollaborationwithHQDLA,maintain appropriateconstituentpartscurrent. b.TheCommandersofDLAandDoDStorageandUsingActivitiesthatFurnish SpecialSupporttoDLAwill: (1)ImplementtherequirementsofthisInstructionandits2enclosures. (2)Ensurethatallpersonswhouse,handle,maintain,recondition,and/or storecompressedgases(liquefiedandnonliquefied)containedincylinders areawareofandcomplywiththeprovisionsofthisjointInstructionandits2 enclosures. (3)Conductinspectionsasrequiredherein,andmaintainconciserecordsof suchinspections.

(4)Assignconditioncodes,andreportinaccordancewiththerequirementsof thisInstructionandits2enclosures. (5)Maintainandsegregateallfullandemptyserviceable,SupplyCondition CodeAcylindersinasafeandusableconditionandensurethatallcylinders codedotherthanSupplyConditionCodeAarehandledproperlyaccordingto theircondition. (6)AssuretheuseofGovernmentownedcylindersforthepurchaseofall compressedgaseswhenaanapproveddedicatedgovernmentownedcylinder canbeidentifiedandcanbemadeavailable. (7)Developandmaintainanaccountabilitysystemforallcommercially ownedcylindersusedtosupplycompressedgasesfromlocaldistributors usingtheirownershipsymbolsandserialnumbers. (8)IdentifyandreturnallnonGovernmentownedcylinderstotheirrightful owners,andensuretheyarenotreturnedtoaDefenseDepotorDoDstorage activityorreportedtoaDLASupplyCenterasexcesspersonalproperty. Assistanceinidentifyingthecommercialownershipsymbolsfoundonthe shouldersofcommerciallyownedcylinderswillbeprovidedbytheDSCR, DSCRJDTA,uponrequest.WhenownershipofanonGovernmentowned cylindercannotbedetermined,itshallbeprocessedbytheholderaslost, abandoned,orunclaimedprivatelyownedpersonalpropertyinaccordance withDoD4160.21M,DefenseMaterielDispositionManual,andsection8 ofenclosure1ofthisInstruction. c.TheCommandersofDepartmentofDefense(DoD)UsingActivitieswill: (1)Ensurethatallpersonnelwhouse,handle,maintain,recondition,and/or storecompressedgases(liquefiedornonliquefied)containedincylindersare awareofandcomplywiththeprovisionsofthisjointInstructionandits2 enclosures. (2)MaintainallConditionCodeAcompressedgascylindersinasafeand usableconditionandensurethatallcompressedgascylinderscodedother thanConditionCodeAarehandledproperlyaccordingtotheircondition. (3)ReportbythecorrectNationalStockNumber(NSN)whichwillprovide theDOTSpec(3AA),theservicepressure(2265),thecapacity(252CF),the dimensions(9by51inches)andtheproduct(oxygen),andthecorrect ConditionCodeallexcessGovernmentownedindustrialcompressedgas cylinderstoDSCRandallexcessGovernmentownedmedicalcompressed gascylinderstoDPSCfordispositioninstructions. (4)Identifyandreturnallcontractorowned,leased,orrentedcylindersto theirrightfulownersandensuretheyarenotreportedtoaDLACenteras excess.WhenacylindercannotbeidentifiedtoavalidNSNoritsownership cannotbedetermined,dispositioninstructionsshallberequestedfromthe appropriatemanagingactivity. d.TheCommander,DefenseReutilizationandMarketingService(DRMS)will: (1)Receiveserviceable,unserviceableandcondemned,compressedgas cylindersfromauthorizedactivitiesinaccordancewithDoD4160.21M,and section8ofenclosure1ofthisInstruction.

(2)Maintainallfullyserviceablecylinders(SupplyConditionCodeA)ina safeandusablecondition. (3)Disposeofserviceable,unserviceable,andcondemnedcompressedgas cylindersinaccordancewithDoD4160.21M. (4)EnsurethatallDRMSpersonnelwhouse,handle,maintain,and/orstore gascylindersareawareofandcomplywiththeprovisionsofthisjoint Instructionandits2enclosures. G.EFFECTIVEDATE.Thispublicationiseffectiveimmediately. H.INFORMATIONREQUIREMENTS.(Reservedforfutureuse.) BYORDEROFTHEDIRECTOR,DEFENSELOGISTICSAGENCY,ANDTHE SECRETARIESOFTHEARMY,THEAIRFORCE,THENAVY,ANDTHE COMMANDANTOFTHEMARINECORPS

R.B.FREDERICK Acting,HeadquartersComplex Commandant KEITHW.LIPPERT RearAdmiral,SC,UnitedStatesNavy Commander NavalSupplySystemsCommand JOHNW.HANDY,LtGeneral,USAF DCS/InstallationsandLogistics G.S.MCKISSOCK LieutenantGeneral,U.S.MarineCorps DeputyChiefofStafffor InstallationsandLogistics LouisCaldera SecretaryoftheArmy

ENCL1 DLAI4145.25 AR70068 NAVSUPINST 4440.128D AFJMAN23227(I) MCO10330.2D

SECTION1 DEFINITIONS 11.GENERAL.Thisdocumentanditstwoenclosureshavebeendevelopedto provideguidanceanddirectioninthestorageandhandlingofcompressedgascylinders andtheircontents,normallyprocured,stocked,andusedwithintheDepartmentof Defense(DoD).Thereareseveralmorecompressedgasesusedinthecommercial industrythatarenotaddressedinthisdocument.Someofthosemayfindtheirwayinto themilitarysystem,someofwhichmaybeextremelyhazardous.Shouldcylindersof suchgasesbeidentified,theyshouldbeisolatedinaprotectedlocationawayfromany noncompatiblematerialsuntilspecificdirectionontheirsafehandlingandstoragecanbe established.TheDepartmentofTransportation(DOT),in1967,assumedfromthe InterstateCommerceCommission(ICC)allregulatoryfunctionsforcompressedgases andgascylinders.ReferenceismadetoDOTwiththeunderstandingthatICCcylinders withtheirmarkingsnowintheDoDsystemwillretaintheirICCidentification. 12.DEFINITIONS A.CompressedGas.Class2,Divisions2.1,2.2,and2.3 1.Division2.1,FlammableGas.Flammablegasmeansanymaterialwhichisagas at20C(68F)orlessand101.3kPa(14.7psia)ofpresssure(amaterialwhichhasa boilingpointof20C(68F)orlessat101.3kPa(14.7psia))which a.Isignitabaleat101.3kPa(14.7psia)wheninamixtureof13percentorlessby volume: b.Hasaflammablerangeat101.3kPa(14.7psia)withairofatleast12percent regardlessofthelowerlimit.ThelimitsspecifiedinA1aandbshallbedeterminedat 101.3KPa(14.7psia)ofpressureand20C(68F)inaccordancewithASTME68185, StandardTestMethodforConcentrationLimitsofFlammabilityofChemicals.Other methodsofdeterminationapprovedbetheAssociateAdministratorforHazardouis MaterialsSafety,U.S.DepartmentofTransoprtationasacceptable. 2.Division2.2,NonFlammable,Nonpoisonouscompressedgas,(including compressedgas,liquefiedgas,pressurizedcryogenicgas,compressedgasinsolution, asphyriantgasandoxidizinggas).Anonflammable,nonpoisonouscompressedgas meansanymaterialwhich

a.exertsinthepackaginganabsolutepresssureof180kPa(40.6psia)orgreaterat 20C(68F),and b.DoesnotmeetthedefinitionofDivision2.1or2.3. 3.Division2.3,GasPoisonousbyInhalation.Agaspoisonousbyinhalationmeans amaterialwhichisagasat20C(68F)orlessand101.3kPa(14.7psia)ofpressure(a materialwhichhasaboilingpointaf20C(68F)orlessat101.3kPa(14.7psia)which a.Isknowntobesotoxictohumansastoposeahazardtohealthduring transportation,or b.Intheabscenceofadequatedataonhumantoxicity,ispresumedtobetoxicto humansbecausewhentestedonlaboratoryanimalsithasanLC50valueofnotmorethan 5000mlpercubicmeter.LC50valuesmaybedeterminedusingtheformulafoundin CFR49,173.133(b)(1)(i). 4.CompressedGasInSolution.Theterm@compressedgasinsolution"identifiesa nonliquefiedcompressedgasthatisdissolvedinasolvent.Inthiscasewearespeaking ofacetylenewhichisdissolvedintoacetone. 5.CryogenicLiquid.Acryogenicliquidmeansarefrigeratedliquefiedgashavinga boilingpointcolderthat90C(130F)at101.3kPa(14.7psia).Itmustbesupercooled (refrigerated)forittocondenseintotheliquidstate.Itisthereforesometimesreferredto asarefrigeratedliquid.Amaterialmeetingthisdefinitionissubjecttotherequirements ofTitle49CFR,regardlessofwhetheritmeetsthedefinitionofacompressedgasin subparagraph1above.Anexampleofthistypeofmaterialispartiallydescribedas "oxygen,refrigeratedliquid"(cryogenicliquid)inTitle49CFR,Paragraph172.101. Gasesmeetingthesecharacteristicswouldbegasessuchasoxygen,nitrogen,argon, helium,andhydrogen. 6.LiquefiedCompressedGas.Theterm"liquefiedcompressedgas"meansagas whichinapackagingunderthechargedpressure,ispartiallyliquidatatemperatureof20 C(68F).GasesmeetingthesecharacteristicswouldbetheLiquefiedPetroleumGases (ButaneandPropane),alloftherefrigerantgases,ammonia,chlorine,andthefire fightinghalons1202,1211,and1301. 7.NonliquefiedCompressedGas.Theterm"nonliquefiedcompressedgas"means agas,otherthaninsolution,whichinapackagingunderthechargedpressureisentirely gaseousatatemperatureof20C(68F).Thesearesometimesreferredtoasthe permanentgases.Theywillalso(whensupercooledorrefrigerated)meetthe characteristicsofacryogenicliquidorarefrigeratedgas.Gasesmeetingthese characteristicswouldbeoxygen,nitrogen,argon,helium,andhydrogen. B.Cylinder.Acompressedgascylinderisapressurevesseldesignedforthestorage andtransportationofacompressedgasatpressureshigherthan40poundspersquare inchabsolute(psia),25poundspersquareinchgage(psig)withatubularshapeand circularcrosssection.Thisdoesnotincludeaportabletank,amultiunittankcartank,a cargotank,oratankcar.(Title49CFR,Section171.8).

1.EmptyCylinder.Acylindermaybeconsideredemptybytheuseratanytime whentheremainingcontents(usuallypressure)inthecylinderisbelowanacceptable levelforthedesignatedapplicationhoweverunderallcircumstancesthefollowing regulatoryrequirementsapply: a.AnycylindercontainingtheresidueofaDOTregulatedhazardousmaterial (HAZMAT)mustbeofferedfortransportationandtransportedinthesamemanneras whenitcontainedagreaterquantityofthatHAZMAT.Thisincludesclassification, marking,labeling,identification,shippingpapersetc. b.Acylinderisnotsubjecttotherequirementsofthehazardousmaterials regulationsifit: (1).Isunused (2).Issufficientlycleanedofresidueandpurgedofvaporstoremoveany potentialhazard (3).Containsonlytheresidueofanonflammablegaswithnosubsidiaryhazard atanabsolutepressurelessthan280kPa(40.6psia)at20C(68F)andanymaterialinthe cylinderdoesnotmeetthedefinitionforahazardoussubstance,hazardouswaste,ora marinepollutant. c.EmptyNewProcurement ExceptforDOT8or8ALcylinders,cylinders receivedasaresultofprocurementactionshouldbepressurizedwithnotlessthan5psi ofnitrogenandshouldbetagged"PRESERVEDWITHNITROGENGAS."ADOT "Empty"labelisnotrequired. d.AcetyleneNewProcurementDOT8or8ALcylindersreceivedasaresultof procurementactionwillhaveaflammablesolventinitsporouscore.Thesecylindersare notrequiredtobelabeled"Flammable"or"Empty"bytheU.S.DOT. 2.CleanedandPurgedCylinder.Anycylindercleanedandpurgedofallhazardous residueinaccordancewithTitle49CFR,Paragraph173.29,andchargedwithapositive pressureofaninertgas(e.g.,nitrogen),ordry,oilfreeair,nottoexceed24psig(39psia) at70Fandproperlytagged"cleanedandpurged."Undernocircumstancesshall standardoiltolerantshopair(airthathasbeencompressedwithanoillubricated compressorwithoutadequatefiltrationandcleaningbeusedtopurgeandpressurizea "cleanedandpurged"cylinder. C.FlammableRange.AsdefinedinParagraph173.115ofTitle49CFR,theterm "flammablerange"shallbeusedtodescribethevaluesofthevolumepercentageofthe materialinairbetweentheminimum,LowerFlammableLimit(LFL),andthemaximum, UpperFlammableLimit(UFL),whichformsaflammablecompressedgas. D.ExplosiveRange.Theterm"explosiverange"shallbeusedtodescribethevaluesof thevolumepercentageofthematerialinairbetweentheminimum,LowerExplosive Limit(LEL),andthemaximum,UpperExplosiveLimit(UEL),whichcanbedetonated.

E.Inert.Inertdefinesthetypeofacompressedgasthatisnotflammable,corrosive, oxidizable,orpoisonousandisessentiallychemicallyinactive.Gasessuchashelium, neon,argon,andnitrogenareconsideredinert. F.Mixture.Mixturedefinesamaterialthatiscomposedofmorethanonecompoundor element.(Title49CFR,Paragraph171.8) G.OilFree.Forapplicationsthatcannottoleratehydrocarboncontamination,theterm "oilfree"shallbeusedtoidentifyuserestrictionswhenappliedtoair,helium,and nitrogen.Applicationsthatcannottoleratehydrocarboncontaminationincludethe purgingofoxygensystemsorcomponents,delicateinstruments,humanrespiration systemsandequipment,heavyartilleryrecoilmechanisms,etc.Suchgasesshallnotbe usedonorwithanysysteminwhichfeedbackofoilorotherhydrocarboncontaminants intothecylinderispossible.Thistermhasreplacedtheterm"waterpumped,"which originallyindicatedthatthegaswaschargedintothecylinderwiththeuseofawater andsoaplubricatedcompressor.Thistypeofcompression,nolongeringeneraluse,has beenreplacedwithsystemsusingadiaphragmtypecompressororasystembywhichthe gasispumpedasacryogenicliquid,thenpassedthroughavaporizertoconvertitintoa gasasitischargedintocylinders.Theneedtoidentifythetypeofcompressionhasthus changedtoaneedtoidentifythetypeofapplication.Ithasbeenfoundthathydrocarbon contaminationcanmigratebackintoacylinderfromasystemwithwhichitisusedby pressurefeedback.Itis,therefore,necessarytocontinuethedistinctseparateapplications ofinertgaseswithsystemsthatdemandahydrocarbonfreegasandsystemsthatcan tolerate,orthatdocontain,hydrocarbonproductssuchasoilorhydraulicfluids.The purposeinmakingadistinctionbetweenthesetwoapplicationswastoenhanceuser safety.Consequently,differentcylindervalveoutletconnectionsarenowemployed,and adaptorsarenotauthorizedfornoncompatibleapplications. H.OilTolerant.Theterm,"oiltolerant,"whenappliedtoair,helium,andnitrogen, indicatesthatthegascanbeusedinapplicationsthatcantolerateorcontaina hydrocarbonmaterialsuchasoilorsimilarfluids.Suchapplicationswouldbefor purgingorpressurizinghydraulicorpneumaticsystems,leaktestingofrefrigerant systems,pressurizingaircraftstruts,andgeneralusebymaintenanceandautomotive shops,etc.Thistermhasreplacedtheterm"oilpumped,"whichoriginallydesignated thatthegaswaschargedintothecylinderwiththeuseofanoillubricatedcompressor. Thistypeofcompressionsystemisstillavailableandisstillusedforsomegases however,somegassystemsareusingadiaphragmcompressor,andstillothers,suchas nitrogensystems,arenowchargingnitrogenintocylindersbypumpingthegasasa cryogenicliquidandthenpassingitthroughavaporizertoconvertittoagasasitis chargedintocylinders.Eventhoughthegasisnowchargedfroman"oilfree"source fromthecryogenicfluid,ithasbeenfoundthatthecylinderscanbecomecontaminated withfeedbackfromasystemusinghydrocarbonproductssuchasoilorotherhydraulic fluids.Itwas,therefore,necessarytocontinuetheseparateanddistinctapplicationof certaininertgases(air,helium,nitrogen).Theterm"oiltolerant"isnowusedto designatethetypeofapplicationswithwhichthegasesshallbeused.Theseparationof thistypeofapplicationhasbeenfurtherenhancedbytheuseofaspecificcylindervalve

outletconnection.Inertgasesidentifiedasoiltolerantmustnotbeusedtopurgeor pressurizeoxygenorairforhumanrespirationsystems.Theyshallonlybeusedwith systemsthatdoorcantoleratehydrocarboncontamination.Contaminationofanoxygen systemwithanoiltolerantgascouldresultinafireorexplosionwithlossoflifeorofa completeweaponssystem. I.Oxidizer.Thetermoxidizerdefinesacompressedgasthatreadilyyieldsoxygento stimulatethecombustionoforganicmatterandwhencontainedinacylinder,thecylinder willbesolabeledinaccordancewithTitle49CFRSection173.127.

J.PressureReliefDevice.Thisisadevicethatisemployedtopreventtheruptureofa chargedcompressedgascylinderunderabnormalconditions(overfilling,over pressurization,engulfedinafireetc).Thedevicecanbedesignedtobeactivatedby eitherpressureortemperatureandwillrelieveallorpartialpressuresufficientlyto preventtheruptureofthecylinder.Suchadevicemustbesubjectedtoafiretestas requiredbySection173.34(d)ofTitle49CFR.Pressurereliefdevicesareprohibitedon cylinderschargedwithapoisonAgasorliquidandfluorine. K.PSIorpsi.PSIorpsiistheabbreviationforpoundspersquareinchwhendefining pressure. L.PSIAorpsia.PSIAorpsiaistheabbreviationforpoundspersquareinchabsolute. Thisisgagepressureplustheatmosphericpressureof14.7psi. M.PSIGorpsig.PSIGorpsigistheabbreviationforpoundspersquareinchgauge. Thepressureindicatedonthepressuregaugewhichrepresentsthepressureabove atmospheric.ThisisthepressurereadonapressuregagewhereA0"istheabsenceof pressureorvacuum. N.Residue.Residueisthematerial(compressedgas)remaininginacylinderafterits contentshavebeenexhaustedtothemaximumextentpracticableandbeforethecylinder iseitherrefilledorcleanedofhazardousmaterialandpurgedtoremoveanyhazardous vapors.(Title49CFR,Section171.8) O.ServicePressure.Theterm"servicepressure"(sometimesreferredtoasworking pressure)isdefinedastheauthorized(designed)fillpressureofthecompressedgas cylinder.ThiswillbeanumericvalueimmediatelyfollowingtheDOTspecification stampedintotheshoulder,headringorfootringofthecylinder.Forexample,for cylindersmarked"DOT3AA2265,"theservicepressureis2265psig.Thisisthe predeterminedpressuretowhichthecylinderisauthorizedtobechargedata stabilized temperatureof70F. P.TemperatureLimits.Thetemperatureof130FiscitedintheTitle49CFRasthe uppertemperaturelimittobeusedforcalculatingwhenacylinderwillbecomeliquid full,andinthedefinitionofacompressedgas.Thistemperaturehasbeendeterminedto

bethemaximumtemperaturenormallyencounteredduringthetransportationandstorage ofcompressedgases.Forthepurposesofthisregulation,130Fiscitedintextwhenit relatesdirectlytoacitationin Title49CFR.Toprovideanextramarginofsafety, temperaturelimitscitedinotherpartsofthisregulationhavebeenloweredto125Ffor DoDandDLAactivities. Q.USP.USPmeansPharmacopoeiaoftheUnitedStates.Thisisadocumentpublished bythemedicalprofessionthatcontainsalistofdrugsandmedicinesanddescribestheir preparation,properties,uses,etc.

SECTION2 CHARACTERISTICSOFGASES 21.GENERAL.Personnelhavingtheresponsibilityofstoring,handling,and/orusing compressedgasesandgascylindersmusthaveaworkingknowledgeofthe characteristicsandhazardsassociatedwitheachindividualgas.Specificanddetailed informationonthepropertiesand/orhazardsofanygasisbestobtainedfromthe manufacturer orsupplieroftheproductthroughMaterialSafetyDataSheets(MSDS)or brochures.Additionalinformationtothatprovidedinthisdocumentisavailableinother referencematerialfromcommercialsources.Thefollowingcommercialpublicationsare recommendedassourcesforadditionalinformationpertainingtotechnicaldataandto firstaidandmedicaltreatmentforexposuretogases: A.EffectsofExposuretoToxicGases/FirstAidandMedicalTreatment, availablefromMathesonGasProducts. B.GasDataBook,availablefromMathesonGasProducts.Thisdocumentcontains technicalinformationaboutthevariouscompressedgasesandprovidessuchinformation asthechemicalcharacteristics,howagasismanufactured,howitisused,howitis transported,safetyandhealthinformationandhowtodisposeofit. C.MethodsforHydrostaticTestingofCompressedGasCylinders,CGAPamphletC1, availablefromtheCompressedGasAssociation(CGA).Thispamphletprovidesthe detailedinformationon theretesting(requalification)ofcompressedgascylinders. D.HandbookofCompressedGases,availablefromtheCGA.Thisdocumentisa compilationoftechnicalinformationsimilartothatoftheMathesonGasDataBookbut alsocontainmuchofthespecificinformationfoundintheindividualCGApamphlets. E.ChlorineManual,availablefromTheChlorineInstitute.Thisdocumentprovides detailedinformationonthemanufacture,transporting,safetyandhealthandothercritical informationon thechlorineindustry. F.CylinderServiceLifeSeamless,HighPressureCylinderSpecificationICC/DOT3, ICC/DOT3A,ICC/DOT3AA,CGAPamphletC5,availablefromtheCGA.This documentprovidesdetailedinformationonthemanufactureofcylindersandwhenused withtheresultsofthehydrostatictestoutlinedinPamphletC1,apersoncandetermine theexpectedlifeofahighpressuresteelcylinder. G.StandardsforVisualInspectionofCompressedGasCylinders,CGA PamphletsC6,C6.1,C6.2andC6.3availablefromtheCGA.Thesedocuments providedirectionandguidanceinperformingavisualinspectionofacompressedgas cylindertovisuallydeterminetheintegrityofthestructureofthecylinder.

22.GASESANDTHEIRCHARACTERISTICS. Thegasesmostlikelytobefound intheDLAandDODstorageandsupportfacilitiesinventoriesarelistedbelow.The labelrequirementsforeachgasareindicated.Forspecialhandlingandtransportation, refertothespecificlabelrequirementsfoundinPara172.101oftheCodeofFederal Regulations,Title49andpart82ofCFRTitle40(EPA). A.Acetylene,Dissolved(HazardClass2.1,I.D.No.UN1001,FlammableGasLabel). Acetyleneisacompoundofcarbonandhydrogeninproportionsbyweightofabout12 partscarbonto1parthydrogen(92.3to7.7percent).Pureacetyleneisacolorless,highly flammablegasofagreeableetherealodor.Acetyleneofordinarycommercialpurityhas adistinctivegarliclikeodor.Itisverysolubleinacetone,1volumeofacetonewill dissolve300volumesofacetyleneat160psig.Itisslightlylighterthanair.Acetyleneis shippeddissolvedinacetone.Fullcylinderpressureis250psig.Acetyleneisasimple asphyxiantandananesthetic.Lowconcentrationsofvaporshasananestheticeffect,and vaporsinhighconcentrationsorinenclosedspacesmaycauseasphyxiation.Acetylene initsfreestateunderpressure,maydecomposeviolently.Thehigherthepressure,the smallertheinitialforcerequiredtocauseanexplosion.Therefore,NEVERusethefree gasoutsidethecylinderatpressuresinexcessof15psig.Acetyleneishighlyflammable overawiderangeandformsexplosivemixtureswithair(LFL2.5percentandUFL100 percent).Acetylenecylindersshouldalwaysbestored,transported,andusedinan uprightpositiontoavoidlossofsolvent(acetone)duringuseandtoprovideasafe positionofthecylindershouldapressurereliefdevicebeactivatedduringafire.The verticalpositionofthecylinderwillletthe15footspoutofflamethatcandevelopto harmlesslyreleasethecontentsofthecylinderwithoutcuttingintoanothercylinder.Ifa cylinderhadtobepositionedinahorizontalpositionforanyreason,itmustbepositioned inanuprightpositionforaminimumofatleast2hourspriortoitsuse.Somegradesof commercialacetylenehavetoxicimpuritiestherefore,breathingofacetylenevaporsin anyconcentrationmustbeavoided.Acetylenecancausecardiacirritability. B.Air,Compressed(HazardClass2.2,I.D.NO.UN1002,NonflammableGasLabel) Air,Refrigeratedliquid(CryogenicLiquid)(HazardClass2.2,I.D.No.UN1003, NonflammableGas(primary)andOxidizer(subsidiary)Labels).Airisthenatural atmosphereoftheearthanonflammable,colorless,odorlessgasthatconsistsofa mixtureofgaseouselements(withwatervapor,asmallamountofcarbondioxide,and tracesofmanyotherconstituents).Synthesizedairisproducedbycombiningpure oxygenandnitrogenandcontainsbetween19.5and23.5percentoxygen,withthe balancenitrogenandwithamajorportionoftheothercomponentseliminated.Dryairis noncorrosive.Liquefiedairistransparentwithabluishcastandhasamilkycolorwhenit containscarbondioxide.Becauseairisamixture,notacompound,itcanbeseparated intoitscomponents.Themostcommonmethodistheliquefactionofairbyreducingits temperaturetoapproximately 320degF(195.6degC),thenfractionallydistillingto removeeachoftheconstituentsasfractions.Compressedairisnontoxic.Itmayactas anoxidizingmaterial.Directcontactwiththereleasinghighpressuregasorthe cryogenicliquidmaycausefrostbite.

C.Ammonia,Anhydrous(HazardClass2.3,I.D.NO.UN1005,PoisonGas(primary) andcorosive(subsidiary)Labels).Ammoniaisthecompoundformedbythechemical combinationofthetwogaseouselements,nitrogenandhydrogen,inthemolarproportion ofonepartnitrogentothreepartshydrogen.Thisrelationshipisshowninthechemical symbolforammonia,NH3.Onaweightbasistheratiois14partsnitrogento3parts hydrogenorapproximately82percentnitrogento18percenthydrogen.Theterm ammoniaisthenameofthechemicalcompound,NH3,whichiscommonlycalled anhydrousammonia.ANHYDROUSmeanswithoutwaterandwhenusedwithammonia indicatesthewatercontentislessthan0.2percent.Thisdifferentiatesitfromthevarious widelyusedaqueoussolutionsofammonia. Atroomtemperatureandatmospheric pressure,ammoniaisapungent,colorlessgas.Itmaybecompressedandcooledtoa colorlessliquid.Betweenthemeltingandcriticalpoint,liquidammoniaexertsavapor pressurewhichincreaseswithrisingtemperature.Whenanhydrousammoniainaclosed containerisinequilibriumwithanhydrousammoniavapor,thepressurewiththe containerbearsadefiniterelationshiptothetemperature.Anhydrousammoniavapors areextremelyimitatingtotheeyesandrespiratorytract,andinhighconcentrationscan befatalhowever,personswillnotwillinglyremaininanatmosphereofammonialong enoughtoincurpermanentphysicaldamage.Ammoniavaporscanformflammableand explosivemixturesinair(LFL15.5percent,UFL 27percent,LED16percent,andUEL 25percent),however,theseconcentrationsareseldomencountered.Liquidanhydrous ammoniaisextremelycold,28F,andcontactwithskinmaycauseseverefrostbiteand seriouseyedamage. D.Argon,Compressed(HazardClass2.2,I.D.NO.UN1006,NonflammableGas Label).Argon,RefrigeratedLiquid(CryogenicLiquid)(HazardClass2.2,I.D.NO. UN1951,NonflammableGasLabel)Argonisnonflammableandnontoxicandwillnot supportcombustion.Itismanufacturedasacryogenicliquidwithanormalboilingpoint of 302.6F.Asacryogenicfluid,itisstoredandtransportedinspecialinsulatedand vacuumjacketedcylinders(DOT4L)withawatercapacityofnotover1000pounds (454.6litersor120gallons)orininsulatedtanksandcargotanktrucks.Itisalso vaporizedintoitsgaseousstateandchargedintohighpressurecylinders(DOT3Aor 3AA)of1800psigorgreater.Argon,initscryogenicliquidstate,isnormallystoredin largeinsulatedstoragetanksatthemanufacturingfacilityandisdeliveredinsmall quantitiesdirectlytothepointofuseortoaspecialstoragefacilitydesignedfor cryogenicliquids.Argon,asacryogenicliquid,cannotbestoredinaclosedcontainer becausetheliquidiscontinuouslyboiling(vaporizing)andbuildinguppressure therefore,itisstoredinacontainerwithanopenventoraventthatincorporatesa controlledpressurereliefdevice.Thestorageandhandlingofargon,asaddressedinthis regulation,willbeinitsvapororgaseousstateinhighpressureDOT3A,3AA,or3AL cylinders.Duetoitsabilitytodisplaceair,argonisasimpleasphyxiant.Contactwith thecryogenicliquidoritscoldvaporsandtheescapinghighpressurefromacylinder maycausefrostbiteandseriouseyedamage. E.CarbonDioxide(HazardClass2.2,I.D.NO.UN1013,NonflammableGasLabel). Carbondioxideincylindersisintheformofagasoverliquidandat70Fexertsa pressureof838psig.Humanscannotbreathaircontainingmorethan10percentcarbon

dioxide(byvolume)withoutlosingconsciousness.Thegasisabout1.5timesheavier thanairandisnontoxic,nonreactive,slightlyacidic,andwillnotburnorsupport combustionorhumanlife.Carbondioxidegasinterfereswithpropermentationat1.9 percentandisnottolerableat3.5percent 5.0percent.Carbondioxidecylindersbecome extremelydangerouswhenheatedtoatemperatureapproximating125Fandshould neverbeplacednearfurnaces,radiators,oranyothersourceofheat.Contactwiththe liquidorhighpressuregasmaycausefrostbiteandseriouseyedamage. F.CarbonMonoxide,Compressed(HazardClass2.3,I.D.NO.UN1016,PoisonGas (primary)andFlammableGas(subsidiary)Labels)Carbonmonoxideisanextremely flammablegas(LFL12.5percentandUFL74percent).Whenpure,itisodorlessand colorlessanddoesnotgivewarningofitspresencetherefore,cylindersmustalwaysbe placedinawellventilatedareaawayfromsourcesofignition oroxidizinggases. Prolongedbreathingoflowconcentrationsmaycauseheadaches.Anginaandheart attackscanresultfromexposuretopeoplewithcardiacproblems.Breathinghigh concentrationsofcarbonmonoxidemaybefatal. G.Chlorine(HazardClass2.3,I.D.NO.UN1017,PoisonGas(primary)andcorrosive (sibsidiary)Labels).Chlorineischargedintocylindersasanamberliquidthatturnstoa nonflammablegreenishyellowgasat29F.Chlorinemustnotbeconfusedwith swimmingpoolchemicals,suchascalciumhypochloriteorsodiumdichloroisocyanurate, thataresometimeserroneouslycalledchlorine.Althoughchlorineisnonflammable, mostcombustiblematerialswillburninachlorineatmosphereastheydoinanoxygen atmosphere,andflammablegasesandvaporswillformexplosivemixtureswithchlorine. Chlorinereactsexplosivelyorformsexplosivecompoundswithmanycommon chemicals,especiallyacetylene,turpentine,ether,anhydrousammonia,fuelgas, hydrocarbons,hydrogen,andfinelydividedmetals.Chlorinegasisprimarilya respiratoryirritantinhighconcentrations,itcouldcauseseriousphysicaldamage. However,personswillnotwillinglyremaininanatmosphereofchlorinelongenoughto incurpermanentdamage.Liquidchlorineorhighpressuregasmaycausefrostbiteand seriouseyedamage. H.ChlorineTrifluoride(HazardClass2.3,I.D.NO.UN1749,PoisonGas(primary), Oxidizer(subsidiary)andCorrosive(subsidiary)Labels).Chlorinetrifluorideisa greenishyellowliquidwhichturnstoanearlycolorlessgasatitsboilingpointof53F. Itisdangerouslyreactive.Itwillignitemostcombustiblematerials.Itreactsviolently withwatertoformhydrogenfluorideandchlorine.Italsoreactsstronglywithsand, siliconcontainingcompounds,glass,andasbestos.Theliquidisextremelytoxicand corrosive.Contactwithskinoreyeswillcausedeep,painfulburns.Vaporswillcause severedamagetotheeyes,skin,respiratorytractandmucousmembranes,andmaycause pulmonaryedema. I.Chlorofluorocarbons,Flammable(HazardClass2.1,I.D.NO.Seebelow,Flammable GasLabel).Flammablechlorofluorocarbons,suchaschlorodifluoroethanesR142b, (UN2517)a refrigerantandlowtemperaturesolvent,anddifluoroethaneR152a,(UN1030)an

intermediate,shouldneverbeconfusedwithormistakenfornonflammable,chlorofluoro carbons.Thesematerialsarehighlyflammableand,insomecases,highlyreactive. Healthhazardsarethesameasfornonflammablechlorofluorocarbons. J.Chlorofluorocarbons,Nonflammable(HazardClass2.2,I.D.NO.Seebelow, NonflammableGasLabel)Chlorofluorocarbongasesaremostcommonlyusedin refrigerationandairconditioningapplications.Althoughclassedasnonflammable, chlorofluorocarbonsmixedwithflammableliquidsorgasesmaybeflammableand shouldbehandledwithcaution.Partiallyhalogenatedcompoundsmayalsobe flammableandmustbeindividuallyexamined.Althoughthetoxicityof chlorofluorocarbonsislow,thepossibilityofinjuryordeathexistsinunusualsituations orifthematerialisdeliberatelymisused.Thevaporsareseveraltimesheavierthanair, andunderstaticconditions,uniformdistributioninanenclosedspacemightbequite slow.Goodventilationshouldbeprovidedinareaswherehighconcentrationsofthe heavyvaporsmightaccumulateandexcludeoxygen.Chlorofluorocarbonscominginto contactwithhotsurfacesoropenflameswillproducefumesofextremelyirritatingand toxichydrogenchlorideand/orhydrogenfluoride.Inhalationofthechlorofluorocarbons inhighconcentrationisdangerousandcanbefatal.Whentreatingpersonssufferingtoxic effectsfromexposuretochlorofluorocarbons,theuseofepinephrineorsimilardrugs shouldbeavoidedbecausetheymayproducecardiacarrhythmias,includingventricular fibrillation. Chlorofluorocarbonsidentifiedasthefollowinghavebeendeterminedtobeozone depletingsubstancesandhavebeenbannedfromfurtherproduction.Thesecompressed gasesmustnowbecaptured(Recovered)andreturnedtotheDODreservenowbeing managedbyDSCR.Theseproductswillbereissuedtoqualifiedactivitiesforusein criticalapplicationswhereanalternatehasyettobefound.Instructionsfor theoperation oftheprogramandtheprocedurestobeusedfortheturninoftheseproductscanbe foundinSection12ofthisenclosure.(Thislistcontainsonlythosecompressedgases nowinusebytheDOD)ThetotallistofproductshavebeenidentifiedasClassIorClass IIsubstances.TheclassIsubstanceshavebeenbannedfromfurtherproduction,the ClassIIsubstanceswillbebannedatalaterdate. GroupI TrichlorofluoromethaneR11 DichlorodifluoromethaneR12 TrichlorotrifluoroethaneR113 DichlorotetrafluoroethaneR114 MonochloropentafluoroethaneR115 GroupII Bromochlorodifluoromethane:(Halon 1211) Bromotrifluoroethane(Halon1301) Dibromotetrafluoroethane(Halon2402)

K.Cyclopropane(HazardClass2.1,I.D.NO.UN1027,FlammableGasLabel). Cyclopropaneisacolorless,flammable(LFL2.4percentandUFL10.3percent)gas withasweet,distinctiveodorresemblingthatofpetroleumnaphtha.Foritsmajoruseas ananestheticmedicalgas,itmustbesuppliedaccordingtoUSPpuritystandards. Concentrations(byvolume)of6percentresultinunconsciousness,andasthe

concentrationincreasesto23percent,moderatetodeepanesthesiaresults.Concentrations inexcessof23percentarefatal,causingrespiratoryfailure.Theprincipalhazardof cyclopropaneisitsflammability. L.EthyleneOxide,Pureorwithnitrogen(HazardClass2.3,I.D.NO.UN1040,Poison GasandFlammableGasLabels)Ethyleneoxideisahighlyreactivecolorlessgasthat condensestoacolorlessliquidboilingat50.7degF(10.4degC)and14.7psia.Itis miscibleinallproportionswithwater,alcohol,ether,andmostorganicsolvents.The vaporsofethyleneoxideareflammableandexplosive.Itisgenerallynoncorrosiveto metalsandleavesnoresidualodorortaste.Themajoruseofethyleneoxideisasa chemicalintermediateforthemanufactureofethyleneglycolandhigherglycols.These glycolsareusedasdryingagents,antifreezes,andrawmaterialsforthemanufactureof otherchemicalderivatives.Ethyleneoxide,bothpureandmixedwithcarbondioxideor halocarbons,isalsousedasasterilantandfumigantforheatsensitivematerials. AEthyleneoxideisatoxicliquidandgas.ThevaporsfromEthyleneoxideform flammablemixtureswithairoverawiderange(LFL3percentandUFL100percent). Thevaporisheavierthanair(vapordensity1.5)andmaytravelaconsiderabledistance toasourceofignitionandflashback.Ethyleneoxideisdangerouslyreactiveitmay rearrangechemicallyand/orpolymerizeviolentlywithevolutionofheatwhenincontact withhighlyactivecatalyticsurfacessuchasanhydrouschloridesofiron,tin,aluminum, andpureoxidesofironandaluminum,andalkalimetalhydroxides.Althoughsolublein water,solutionswillcontinuetoburnuntildilutedtoapproximately22volumesofwater toonevolumeofethyleneoxide.Ethyleneoxideismoderatelytoxicbyinhalation,and breathingandhighconcentrationsmaycausepulmonaryedema.Itisasevere,eye,skin, andrespiratoryirritant,andeffectsmaybedelayed.Forspecifichealthhazardsreferto theMSDS,theDoDHazardousMaterialsInformationSystem,orthemanufacturer, supplier,orvendorforinformation. M.EthyleneOxideandNonflammableGasMixtures(LabeledAccordingto Mixture).Duetothehighflammabilityandexplosivehazardsofpureethyleneoxideand theneedforitsuseasasterilizerformedicalequipmentandmaterial,amixtureof nonflammablegasesisaddedtothematerialtoreduceitshazard.Themixturesare usually20to90percentcarbondioxideordichlorodifluoromethanebyvolume.The mixturesarelesstoxicthanpureethyleneoxide,butdoposeahealththreatwheninhaled orwhenindirectcontactwith skinoreyes.Forspecifichealthhazardsrefertothe MSDS,theDoDHazardousMaterialsInformationSystem,orthemanufacturer,supplier, orvendorforinformation. N.Helium,Compressed(HazardClass2.2,I.D.NO.UN1046,NonflammableGas) Helium,RefrigeratedLiquid(CryogenicLiquid)(HazardClass2.2,I.D.NO.UN1963, NonflammableGasLabel)Heliumisacolorless,odorless,andtastelessgasatroom temperatureandatmosphericpressure.ItsprincipalsourceintheUnitedStatesisfrom certainnaturalgaswellsinwhichthenaturalgasmaycontainupto9percenthelium.It isnormallysuppliedasanonliquefiedcompressedgasinhighpressureDOT3Aor3AA cylindersatoraboveapressureof1800psigat70F.Heliumcanbecondensedintoa cryogenicliquidwhenrefrigeratedtobelowitsnormalboilingpointof 452.1F,the

lowestboilingpointofanysubstanceknown.Asacryogenicliquid,itisstoredand transportedinspecialinsulatedandvacuumjacketedcylinders(DOT4L)withawater capacityofnotover1,000pounds(454.6litersor120gallons)orinlargerinsulatedand vacuumjacketedtanksandcargotanktrucks.Helium,asacryogenicliquid,islike argonandcannotbestoredinaclosedcontainerbecausetheliquidiscontinuously boiling(vaporizing)andbuildinguppressuretherefore,itisstoredinacontainerwithan openventoraventthatincorporatesacontrolledpressurereliefdevice.Thestorageand handlingofhelium,asaddressedinthisregulation,willbeinitsvapororgasstatein highpressurecylinders.Inhighconcentrations,heliumactsasasimpleasphyxiant, causingsuffocationduetooxygendeficiency.Contactwiththeliquidorcoldvapors maycausefrostbiteandseriouseyedamage. O.Hydrogen(HazardClass2.1,I.D.NO.UN1049,FlammableGasLabel).Hydrogen isacolorless,odorless,flammablegasatroomtemperatureandatmosphericpressure.It isthelightestgasknown.Itisusuallyshippedasanonliquefiedcompressedgasinhigh pressureDOT3Aor3AAcylindersatapressuregreaterthan1800psigat70F. Hydrogencanbecondensedintoacryogenicliquidwhenrefrigeratedbelowitsnormal boilingpointof 423.0F.Asacryogenicliquid,itisstoredandtransportedinspecial insulatedandvacuumjacketedcylinders(DOT4L)withawatercapacityofnotover 1000pounds(454.6litersor120gallons)orinlargerinsulatedandvacuumjacketed tanksandcargotanktrucks.Hydrogen,asacryogenicliquid,islikeargonandhelium andcannotbestoredinaclosedcontainerbecausetheliquidiscontinuouslyboiling (vaporizing)andbuildinguppressuretherefore,itisstoredinacontainerwithanopen ventoraventthatincorporatesacontrolledpressurereliefdevice.Thestorageand handlingofhydrogen,asaddressedinthisregulation,willbeinitsvapororgaseousstate inhighpressurecylinders.Hydrogenburnsinairwithapaleblue,almostinvisible, flame.Hydrogenwillformflammableandexplosivemixturesoverawiderangewithair (LFL4percent,UFL74percent,LED4.1percent,andUEL74.2percent)andoxygen (LFL4percent,UFL95percent,LED4.7percent,andUEL93.9percent).Unlike hydrogenatnormalambienttemperatureswhenitislighterthanair,thecoldgasasitis ventedorreleasedfromthecontainerisslightlyheavierthanairandmayremainnear groundleveluntilitwarmsup.Fogformedwhenthecoldgascomesincontactwiththe moistureintheairwillindicatewherethegasisspreading.However,explosivemixtures canexistoutsidethevisiblefog.Hydrogenisnontoxicbutcancauseasphyxiation. Contactwiththecryogenicliquidorcoldvaporcancausefrostbiteandseriouseye damage. P.LiquefiedPetroleumGases(LPG)(HazardClass2.1,I.D.NO.UN1075,Flammable GasLabel).Theliquefiedpetroleumgasesarebutane,isobutane,propane,propylene (propene),butylenes(butenes)andanymixturesofthesehydrocarbonsasdefinedbythe NationalFireProtectionAssociation(NFPA),DOT,or otherauthority.Theyare flammable(butaneLFL1.8percentandUFL8.4percent,butyleneLFL1.6percentand UFL10percent,propaneLFL2.2percentandUFL9.5percent,andpropyleneLFL2 percentandUFL11.1percent),colorless,andnoncorrosive.Mostareodorless,soan odorantsuchasethylmercaptanisaddedtowarnofthepresenceofthegas.(Propylene andbutyleneshaveafoulodor.)HighconcentrationsofLPGinairmaycausecentral

nervoussystemdepressionwithsymptomsincludinglightheadedness,drowsiness, unconsciousness,andpossiblydeath. Q.MethylAcetyleneandPropadiene.Mixtures,Stabilized,:(MAPP)(HazardClass2.1, I.D.NO.UN1060,FlammableGasLabel).MAPPisaregisteredtrademarkofAIRCO,a divisionofBOCGroup,Inc.,Montvale,NJ,whichisthesolesourceofMAPPgas.The propernameismethylacetyleneandpropadienemixtures,stabilized,andthegasisa stabilizedmixtureofmethylacetylene(CH2CCH)andpropadiene(CH2CCH2).Itisa flammablegaswhosevaporsformflammablemixturesinairoveranarrowrange(LFL 3.4percentandUFL10.8percent).Itspenetrating,foul,andpersistentodorgivesagood warningofitspresence. R.MethylBromide(HazardClass2.3,NO.UN1062,PoisonGasLabel). MethylBromideisacolorlessliquidorgaswithpracticallynoodor.Itisapoisonousgas atroomtemperatureandatmosphericpressure.Athighconcentrations,ithasa chloroformlikeodor.Detectionoflowerconcentrationsisoftenfacilitatedbyawarning odorant,chloropicrin,whichisaddedbythemanufacturer.Methylbromideisflammable onlywheninthepresenceofahighenergysourceandinthenarrowflammabilityrange of10to16percentbyvolumeinair.Itsphysicalpropertiesdonotmeetthedefinitionof aflammablegasasdefinedbytheU.S.DepartmentofTransportation.Theonsetof thermaldecompositionoccursatapproximately752degF(400degC).Methylbromide isusedprimarilyasafumiganttocontrolinsectsinfestingvariousgrainsandnonfood material.Itisalsousedinsmallquantitiesinorganicsynthesisformethylations. Althoughmethylbromideisnotacompressedgas,itisroutinelyencounteredingas cylinders.Inhalationofthevaporisharmfulandcanbefatal.Contactwiththeliquidcan causeseveredamagetotheskin,eyes,ormucousmembranes.Methylbromidehasa chloroformlikeodor. S.MethylChloride(HazardClass2.1,I.D.No.UN1063,FlammableGasLabel) Methylchlorideisacolorless,flammablegaswithafaintlysweet,nonirritatingodorat roomtemperatures.Itisshippedasatransparentliquidunderitsvaporpressureofabout 59psigat70degF(407kPaat21.1degC).Methylchlorideburnsfeeblyinairbutforms mixtureswithairthatcanbeexplosivewithinitsflammabilityrange.Drymethyl chlorideisverystableatnormaltemperaturesandincontactwithair.Inthepresenceof moisture,ithydrolyzesslowly,whichresultsintheformationofcorrosivehydrochloric acid.Attemperaturesabove700degF(371degC),methylchloridemaydecomposeinto toxicendproducts(hydrochloricacid,phosgene,chlorine,andcarbonmonoxide).Itis slightlysolubleinwaterandverysolubleinalcohol,mineraloils,chloroform,andmost organicliquids.Methylchlorideisbothflammable(LFL8.1percentandUFL18.7 percent)andtoxicinhighconcentrations.TherecommendedThresholdLimitValuefor methylchlorideinairis100ppm.Becauseofitsmildodorandnarcoticeffect,persons maybeexposedtoconsiderableconcentrationswithoutbeingawareofthedanger.The symptomsofpoisoningincludedizziness,headache,opticaldifficulties,nausea,and vomiting,andmaybedelayedforseveralhours.

T.Nitrogen,Compressed(HazardClass2.2,I.D.NO.UN1066,NonflammableGas Label)Nitrogen,RefrigeratedLiquid(CryogenicLiquid)(HazardClass2.2,I.D.No. UN1977,NonflammableGasLabel).Nitrogenisanodorless,colorless,tasteless, nontoxic,andalmosttotallyinertgasthatmakesup78percentof theearth'satmosphere. Itiscolorlessasacryogenicliquid.Itisnotflammableandwillnotsupportcombustion orhumanlife.Itismanufacturedasacryogenicliquidwithanormalboilingpointof 320F.Asacryogenicliquid,itisstoredandtransportedineitherspecialinsulatedand vacuumjacketedcylinders(DOT4L)withawatercapacityofnotover1,000pounds (454.6litersor120gallons)orininsulatedandvacuumjacketedtanksorcargotank trucks.Itisalsovaporizedintothegaseousstateandchargedintohighpressure cylinders(DOT3A,3AA,or3AL)1800psigorgreater.Nitrogeninitscryogenicliquid stateisnormallystoredinlargestoragetanksatthemanufacturingfacilityandis deliveredinsmallquantitiesdirectlytothepointofuseortoaspecialstoragefacility designedforcryogenicliquids.Nitrogen,asacryogenicliquidlikeothercryogenic liquids,cannotbestoredinaclosedcontainerbecausetheliquidiscontinuouslyboiling (vaporizing)andbuildinguppressuretherefore,itisstoredincontainerswithanopen ventorwithaventthatincorporatesacontrolledpressurereliefdevice.Alternate methodsofproducingnitrogengasconformingtothephysicalcharacteristicsofFedSpec BBN411maybeproducedutilizingthepressureswingadsorptioncycleortheuseof membranetechnology.Thestorageandhandlingofnitrogenasaddressedinthis regulationwillbeinitsvapororgasstateinhighpressureDOT3A,3AA,or3AL cylinders.Unlikenitrogenatnormalambienttemperatureswhenitislighterthanair,the coldgasasitisventedorreleasedfromthecryogeniccontainerisslightlyheavierthan airandmayremainneargroundleveluntilitwarmsup.Inthiscase,nitrogencanactas anasphyxiant,displacingairandcausingsuffocationduetooxygendeficiency.Fog formedwhenthecoldgascomesincontactwiththemoistureintheairwillindicate wherethegasisspreading.Contactwiththeliquidorcoldgascancausefrostbiteand seriouseyedamage. U.NitrousOxide,Compressed(HazardClass2.2,I.D.NO.1070)andNitrousOxide, RefrigeratedLiquid(HazardClass2.2,I.D.NO.2201),NonflammableGasLabel) Nitrousoxideatnormaltemperaturesandpressuresisacolorless,practically odorless andtasteless,nontoxicgas.Itisshippedasnitrousoxide,compressed,ornitrousoxide, refrigeratedliquid.Nitrousoxideisnonflammable,but,beingamildoxidizingagent, willsupportcombustionofflammablematerials.Itisusedasaninhalanttypeof anestheticoranalgesicgas.Wheninhaledinhighconcentrationsforafewseconds,it affectsthecentralnervoussystemandmayinducesymptomscloselyresembling alcoholicintoxication.Itscolloquialname,"laughinggas,"stemsfromthefactthatsome personsexhibithilarityafterinhalingnitrousoxide.Continuedinhalationwithoutan amplesupplyofoxygenresultsinsimpleasphyxia. V.Oxygen,Compressed(HazardClass2.2,I.D.NO.UN1072,NonflammableGas (primary)andOxidizer(subsidiary)Labels)Oxygen,RefrigeratedLiquid(Cryogenic Liquid)(HazardClass2.2,I.D.No.UN1073,NonflammableGas(primary)andOxidizer (subsidiary)Labels).Oxygeninthegaseousstateiscolorless,odorless,tasteless, nontoxic,andnonflammablebutsupportscombustionvigorously.Itisnecessaryto

sustainlife,anditconstitutesabout20percent,byvolume,oftheearth'satmosphere.As acryogenicliquid,itispaleblueincolorand,atitsnormalboilingpointof 297F,is slightlyheavierthanwater.Itismanufacturedasacryogenicfluidbyfractional distillationofliquefiedair,orismanufacturedasagasusinganelectrolyticgenerator. Oxygenproducedbythepressureswingadsorptioncycleisamaximumof94%oxygen withtheremainderconsistingofArgon.ThisprocessdoesnotmeetMilO27210 procurementforgaseousaviatorsbreathingoxygen.Thereforeitshouldnotbestoredin ahighpressurecylinderdesignatedasaviatorsbreathingoxygen.Asacryogenicliquid, itcanbestoredortransportedinspecialinsulatedandvacuumjacketedcylinders(DOT 4L)withawatercapacityofnotover1,000pounds(454.6literor120gallons)orin insulatedandvacuumjacketedtanksorcargotanktrucks.Itisalsovaporizedintothegas stateandchargedintohighpressurecylinders(DOT3A,3AA,or3AL)of1800psigor greater.Oxygen,initscryogenicliquidstate,isnormallystoredinlargestoragetanksat themanufacturingfacilityandisdeliveredinsmallquantitiesdirectly tothepointofuse ortoaspecialstoragefacilitydesignedforcryogenicliquids.Aswithothercryogenic fluids,itcannotbestoredinaclosedcontainerbecausetheliquidiscontinuouslyboiling (vaporizing)andbuildinguppressuretherefore,itisstoredincontainerswithanopen ventorwithaventthatincorporatesacontrolledpressurereliefdevice.Thestorageand handlingofoxygenasaddressedinthisregulationwillbeinitsvapororgasstateinhigh pressureDOT3A,3AA,or3ALcylinders.Contactwiththecryogenicliquidorthecold vapormaycausefrostbiteandseriouseyedamage.Thecoldgas,asitisventedor releasedfromthecryogeniccontainer,isslightlyheavierthanairandwillremainnear groundleveluntilitwarmsup. Fogformedwhenthecoldgascomesincontactwiththe moistureintheairwillindicatewherethegasisspreading.Allmaterialsthatare flammableinairburnmuchmorevigorouslyinoxygen.Somecombustibles,suchasoil andgrease,burnwithnearlyexplosiveviolenceinanoxygenatmosphere,ifignited. Oxygenitselfisnonflammable.Containersmustbekeptfreeofoil,grease,andanyother organicorhydrocarboncontaminationandshallnotbehandledwithoilyhands,gloves, orgreasyequipment. Useofperchloroethylene,trichloroethylene,or1,1,1, trichloroethanetocleancylindersisprohibitedandmaycreateanexplosiveatmosphere witharesultingfireorexplosion. W.SulfurDioxide,Liquefied(HazardousClass2.3,I.D.NO.UN1079,PoisonGas Label) Sulfurdioxideisacolorlessnonflammablegaswithasharppungentodor.Itliquefiesat temperaturesbelow14F.Thegasisextremelyirritatingtotheeyesandrespiratory tract.Itsirritantpropertiesareattributedtotherapidity withwhichitformssulfurous acidoncontactwithmoistmembranes.SulfurdioxideisontheNationalPrimaryand SecondaryAmbientAirQualityPollutionStandardList.Anyleakmustbeimmediately reportedtoproperauthorities. X.SulfurHexafluoride(HazardClass2.2,I.D.NO.UN1080,NonflammableGas Label)(domestic)/SulphurHexafluoride(international) Sulfurhexafluoride(domestic)/sulphurHexafluoride(international)iscolorless,odorless, nontoxic,nonflammable,andisoneofthemostchemicallyinertgasesknown.Itis shippedasaliquefiedcompressedgasatapressureof310psig.Sulfurhexafluoride

(domestic)/sulphurHexafluoride(international)isnontoxichowever,itcanactasa simpleasphyxiantbydisplacingairinenclosedspaces.Lowerfluoridesofsulfurare producedwhensulfurhexafluoride(domestic)/sulphurhexafluoride(international)is subjectedtoelectricaldischarge,andgasesproducedaretoxicbyinhalation. 23.OTHERGASES.Manyothergases,suchastheoneslistedbelow,arelesslikely tobeencounteredinDoD.Forfurtherinformationrefertoparagraph21. A.Dimethylamine,Anhydrous(HazardousClass2.1,I.D.NO.UN1032,Flammable GasLabel)Dimethylamineisaflammable,alkaline,colorlessgasatroomtemperature andatmosphericpressure.Ithasacharacteristicfishyodorinlowerconcentrations.In higherconcentrations(100to500ppm)thefishyodorisnolongerdetectableandthe odorismorelikethatofammonia.Itisreadilyliquefiedisshippedinsteelcylindersas liquefiedgasunderitsownvaporpressureof11.3psigat21.1degC. B.EthylChloride(HazardousClass2.1,I.D.NO.1037,FlammableGasLabel) EthylChloride,atroomtemperatureandatmospherepressure,isaflammablegaswitha pungent,etherealodor.Ethylchloridehasnarcoticproperties,butoverexposurecan causetoxiceffects.Itisreadilyliquefiedandisshippedinsteelcylindersanddrumsasa liquidunderitsownvaporpressureof37kPa(5.36PSIG)at21.1degC.Flammable range(LFL3.6percentandUFL15.4percent). C.HydrogenChloride,anhydrous(HazardousClass2.3,I.D.No.UN1050PoisonGas (primary)andcorrosive(subsidiary)labels).HydrogenChloride,RefrigeratedLiquid (HazardClass2.3,IDNo.UN2186,PoisonGas(primary)andCorrosive(subsidiary) labels). Hydrogenchlorideisapungent,toxic,corrosivegashavingasuffocationodor.Itis heavierthanair,andfumesstronglyinmoistair.Itisverysolubleinwaterandethyl alcoholandalsosolubleinethylether.Itisshippedincylindersasaliquefiedgasunder itsownvaporpressureof4230kPa(613psig)at21.1degC. D.HydrogenSulfide,(HazardClass2.3,I.D.NO.UN1053,PoisonGas(primary)and FlammableGas(subsidiary)Labels).HydrogenSulfide,atroomtemperatureand atmosphericpressure,isacolorless,flammable,toxicgashavinganoffensiveodor describedasthatofrotteneggs.Itisshippedinsteelcylindersasaliquefiedgasunderits ownvaporpressureof1737kPa(252psig)at21.1degC.Flammablerange(LFL4.0 percentandUFL44percent). E.Neon,compressed(HazardousClass2.2,I.D.NO.UN1065forgaseous,UN1913for refrigeratedliquid(cryogenicliquid),NonflammableGasLabel).Neonisamemberof GroupVIIIAelements,whichhavebeencallednoblegases,inertgases,andaerogens. Neonisacolorless,odorless,andtastelessmonatomicgas.Itexistsinveryminutetraces intheatmosphere(18.18ppmbyvolume).Neonisnormallyavailablecompressedin cylindersatvaryingpressuresdependingonthecylindersize,andalsoin1literquantities inglassflasksatatmosphericpressure.

F.Phosgene(HazardousClass2.3,I.D.NO.UN1076,PoisonGasandcorrosive Labels)Phosgene,atordinarytemperaturesandpressures,isacolorless,nonflammable, highlytoxicgaswithanodorlikethatofmustyhay.Itisreadilyliquefiedtoacolorless tolightyellowliquidandisshippedinsteelcylindersasaliquefiedgasunderitown vaporpressureof74kPa(10.7psig)at21.1degC.Phosgeneisalungirritantandcauses severdamagetothealveoliofthelungs.Thisisfollowedbyedema,resultingin asphyxiation.Inhalationofthegasproducescatchingofthebreath,choking,immediate coughing,tightnessofthechest,lacrimation,difficultyandpaininbreathing,and cyanosis.Serioussymptomsmaynotdevelopuntilseveralhoursafterexposure,forthe immediatesymptomsproducedbyevenafataldosemayberelativelymildsince phosgeneelicitsnomarkedrespiratoryreflexesthus,apersonwhoappearstobebut slightlygassedimmediatelyafterexposuremaybecomeacasualtyseveralhourslater. Themostpronouncedsymptomsofphosgenepoisoningarecoughingwithbloody sputumandweaknesswhichmaylastformonths.

SECTION3 CHARACTERISTICSOFCYLINDERS 31.GENERAL.Intheabsenceofastandardizationprogram,thetypeandsizeof compressedgascylindershasvariedinpastprocurements.Thetype,design,size,and capacitynormallydependonthecommodityofgasandtheamounttobeshippedinone cylinder.Itmaybenecessarytooccasionallyidentifyacylindertoexactspecifications foraspecificapplicationinorwithanenditemorweaponsystem.Thecurrentmethod ofprocurementstipulatesthatallcylindersbepurchasedusingmilitaryorFederal specificationsandstandardstoprovideastandardizationinthecylinderprogram.These documentsarecontinuouslyupdatedtoreflectthenewrequirementsof stateoftheart applications.However,sincethecylinderisanonexpendableitemandiscontinually cycledintoandoutofvariousapplications,methodsmustbeestablishedforits accountabilityandreconditioning.Theproceduresoutlinedinsection4havebeen developedtosimplifythisprocess. 32.BASICCYLINDERTYPES.CompressedgascylindersinusebyDoDactivities andotherGovernmentactivitiesareofthreebasictypes:highpressure,lowpressure,and lowpressureforgasinsolution.Highpressurecylindersarethosemarkedwithaservice pressureof900psig(6200kilopascal(kPa)orgreaterandlowpressurecylindersare markedwithaservicepressureoflessthan900psig(6200kPa).Thedifferentiating pressuretypesofcylindersareidentifiedasDOTdesignations3,4,or8withan applicablesuffixtoidentifytheparticularspecificationthatwasusedinmanufacturing thecylinder.Allcylinderspurchasedand/orrequalifiedforusebyDoDandother Governmentactivitiesmustbemanufactured,inspected,andtestedinaccordancewith Title49CFR,Parts173and178ortoitsdesignatedMilitaryorFederalSpecification. Eachpersonwhorepresentsthathemanufacturesorperformsretestingasoutlinedin Title49CFRmustbeapprovedby,andhavearegistrationnumberissuedby,DOT. Instructionsforobtainingsucharegistrationnumberarecontainedinsection11. A.CylinderTypes.ThecylindersusedthroughoutDoDthataremanagedbyDSCR arecylindersidentifiedbyDOTspecifications3,3A,3AA,3AL,4,4A,4AA,4B,4BA, 4BW,8,and8AL.Themarkingsofatypicalcylindermightbearrangedononesideof theshoulderorheadofthecylinderasfollows: DOT3AA2265 CX428813TW USGOVT Inthiscase,theDOTspecificationis3AA,theservicepressureis2265psigat70F,the purchasingagencyisCX(DSCR),theserialnumberis428813,themanufacturerisTW (TaylorWharton),andtheowneristheUnitedStatesGovernment.Thesesamemarkings couldbearrangedinahorizontallinearoundtheshoulderandmightappearasfollows: DOT3AA2265CX428813TWUSGOVT.Completerequirementsformarkingson cylindersarecontainedintheapplicablecylinderspecificationinTitle49CFR,Part178, andintheGovernmentprocurementspecification.

B.CylinderInterchangeability.Inmostinstances,dependingonproductand application,cylindersofagivenbasictypeareinterchangeable.Forinstance,DOT3A and3AAcylindersareinterchangeablewhentheshatterproofcharacteristicisnotaprime factorintheiruse.DOT4B,4BA,and4BWarealsointerchangeablewhenthematerials ofconstructionarecompatiblewiththeproductused.Inthemilitarysupplysystem,the DOT4Aand4AAcylindersareusedexclusivelyforanhydrousammoniaandshouldnot besubstitutedfororbyanyotherspecification4cylinderunlesssuchuseisapprovedby DOT.Thespecification8and8ALcylindersarepackedwithaporousmaterialthat,even whenthecylindersareempty,makesthemmuchheavierthan wouldnormallybe expected.Thesecylindersareusedexclusivelyforacetylenenootherproductmaybe usedwiththesecylinders.Whennewlymanufactured,theporousmaterialinthese cylindersisfilledwithacetone. C.CylinderSizes.Thephysicaldimensions(e.g.,diameterandheight)ofthecylinders intheDoDinventoryarecontinuouslychangingtomeetnewdesignandapplication requirements.TheGovernment,overthepastseveralyears,hasthusaccumulated varioussizeandcapacitycylindersforeachofthecompressedgasapplications.Thisis morepredominantintheDOT4and8specificationcylinders.Avariationofthecylinder dimensionsto+2inchesindiameterand+6inchesinheightisfoundwithsome refrigerantandacetylenecylindershavingacommonvolumetriccapacity.Insuch instances,thecylindershavebeengroupedtogetherbasedonthecommoncapacityunder oneormoredesignatedNationalStockNumbers(NSNs).Thisgroupingisavailablefor cylindersthatarenotwithin thedimensionalcriteriabutarewithinthecapacitycriteriaof theestablishedNSNs.WhenanNSNhasbeenestablishedforacylinderwithcritical dimensions,orforacriticalenditemapplicationsuchaswherethecylindermustfitina retainingfixtureaboardashiporaircraft,thecylindersmustbewithinthespecified tolerances.ThevariationofcylindersizeisnotasprevalentwiththeDOT3series cylinders.Tolerancesofthesecylindersshallnotexceed+1/4inchdiameterand+1inch inheightfromtheestablishedNSNdescription.AswiththelowpressureDOT4and8 cylinders,therearespecificrequirementsfordot3seriescylindersthatmustbemounted inretainingfixturesthedesignatedtolerancesmustbeconsideredforpropercylinder identificationorcylinderprocurement.MostoftheDOT4and8cylindersthatarenot designatedforaspecificenduseinwhichthesizeiscriticalmaybeidentifiedonlyas cylinderswiththesamecapacityforagivengasunderoneNSN. D.CylinderPressures.Compressedgascylindersaredesignedandconstructedtomeet thespecificneedsofstoring,using,andtransportingcompressedgasessafely.All cylinderdesignsand/ortypesareregulatedandmanufacturedinaccordancewithDOT specifications.EachcylinderhasbeenmarkedwithaDOTspecificationandworking (service)pressure,whichisstamped(notstenciled)intotheshoulderofthecylinderas citedinsubparagraphA,above.Thecylinderselectedforusewithaproductisbasedon thestabilizedpressureoftheproductatanambienttemperatureof130F,whichshallnot exceed5/4timestheservicepressure(atambienttemperatures)ofthecylinderthe materialsusedintheconstructionofthecylinderalsomustbecompatiblewith the

product.Exceptionsapplyforcertainchargedcylindersdependingontheproduct,such asacetylene,liquefiednitrousoxide,orliquefiedcarbondioxide. E.CylinderPressureSubstitutions.Cylindersofthesametypemanufacturedtothe samespecification(3A,3AA,3AL,4B,4BA,or4BW)withagreaterservicepressure thanisnecessaryforthedesignatedproductmaybesubstitutedforthespecifiedcylinder oflowerpressureprovidedtheprescribedvalveandcylindercharacteristicrequirements fortheproductandapplicationaremet.Theminimumservicepressureofacylinderfor acompressedgasthatisfilledbyweight(gasintheliquidstate)isdeterminedbythe vaporpressureofthegasproductatatemperatureof130F.Theapprovedcylindersand theregulatedservicepressuresarefoundinTitle49CFRandintheproductandcylinder descriptionlistingsforFederalSupplyClasses(FSCs)6505,6830,and8120.High pressurecylindersDOT3Aand3AAwithservicepressuresof1800psigorgreaterwill varyincapacitybasedontheservicepressureandtheproduct.DOTcylinders3A2000, 3AA2000,3A2260,and3AA2260werepurchasedinthepastforheliumservice,and NSNswereassignedasnecessary.Ithasbeennecessarytoconvertsomeof these cylinderstootherserviceswhereaspecificNSNdoesnotapply.Thefollowingcylinders havebeenconsolidated:DOT3A2000with3A2015,3AA2000with3AA2015,3A2260 with3A2265,and3AA2260with3AA2265.NewNSNswerenotestablishedforthis consolidation. F.Nonshatterable/ShatterproofCylinders.Theterm"nonshatterable"asusedherein refersonlytospecification3Aand3AAhighpressurecylinders.Thisdesignationisnot consideredapplicabletospecification4or8cylinders.Thistypeofcylinderisrequired inallaircraftandshipboardapplicationswherefragmentationmustbecontrolledto minimizelossoflifeanddamagetovitalsystems.Thedesignationisappliedtohigh pressureDOT3Aor3AAcylindersmadeofahighgradeof steelthatwillnotseparate intomorethantwopieceswhenrupturedbya.50caliberprojectilewhenthecylinderis filledtoitsservicepressure.Cylindersmeetingthisrequirementhavebeenspecifically identifiedbyitemdescriptioninFSC8120.Manynonshatterablecylindersareidentified bythewords"NONSHATTERABLE,""NONSHAT,"or"SHATTERPROOF"stamped, notstenciled,intotheshoulderofthecylinder.Inotherinstances,nonshatterable cylinderscanbeidentifiedasfollows: 1.AllcylindersstampedDOT3AAthataremadeof4130xsteel. 2.AllcylindersstampedDOT3Awithoneofthefollowingspecificationnumbers ontheshoulder:

SPS843(INT) SPS1022(INT) 51C26and51C26(INT) 51C41and51C41(INT)

3.Cylindersthataremarkedwithspecification51C31or51C31(INT)arealso nonshatterableiftheinitial(earliest)hydrostatictestdateis644orlater.Cylinders manufacturedpriorto644arenonshatterableonlyiftheyaresoindicatedbythe manufacturer.Cylindersthatarenotidentifiedbyanyoftheabovemarkingswillnotbe classedandidentifiedbyNSNasnonshatterable.ChangesinNSNsorConditionCodes thatresultfromreidentifyingcylindersfromshatterabletononshatterableasstatedabove willbereportedtoDSCRinaccordancewithDOD4000,252M.MilitaryStandard TransactionReportingandAccountingProcedures(MILSTRAP),exceptthatDDForm 1225,StorageQualityControlReport,isnotrequired. 33.CYLINDERREQUALIFICATION.(NOTE:Whenthereisaconflictbetween DoDcylinderspecificationsandthespecificationsrequiredbythehostnation,themore stringentrequirementsshallapply.)Compressedgascylinderswillnotberefilledifthe prescribedserviceperiodbetweencylinderrequalificationshasexpired.Eachtimea cylinderisrequalified,thedateoftestorinspection,indicatingthemonthandyear,is stampedintotheshoulder,collar,orfootringofthecylinderwithasteelstamp.Thisdate isusedtodeterminethenextscheduledrequalificationdate.TheDOTregistration identificationnumberoftherequalificationfacilityshallbestampedbetweenthemonth andyear.Thismarkingwillprovidetraceabilitytothelastfacilitythatperformeda requalificationonthecylinder. A.Theserviceperiodforeachtypeofcylinderisconsideredtohaveexpiredifthe latestmarkedrequalificationdatestampedontheshoulder,valveguard,orfootringof thecylinderprecedesthecurrentdatebymorethantheperiodindicatedbelow.The referencedparagraphentriesallrefertotheCFRTitle49.TherequirementsofCFRTitle 29,Paragraph1910.157fhavebeenincorporatedintothetestperioddatabasedonthe type(specification)ofthecylinderusedinthefireextinguisher.Onlythetypesthat qualifyascompressedgascylindershavebeenincorporated. DOTCylinder Specification DOT3 DOT3A,DOT3AA SpecificApplications SpecificApplications SpecificApplications SpecificApplications SpecificApplications GeneralApplications DOT3AL SpecificApplications Retest Period 5years

173.34e(12) w/5yearinternalandexternal visual 173.34e(13) noncorrosiveexternalvisual only 173.34e(14) AnhydrousAmmonia 173.34e(16) DryGasApplications 173.34e(19) Extinguishers

10years 5years 10years 10years 12years 5years

173.34e(19) Extinguishers

12years

GeneralApplications DOT4A SpecificApplications SpecificApplications GeneralApplications DOT4AA SpecificApplications SpecificApplications GeneralApplications DOT4B,4BA,4BW SpecificApplications SpecificApplications SpecificApplications SpecificApplications SpecificApplications GeneralApplications DOT8,8AL SpecificApplications SpecificApplications

5years

173.34e(12) With5yearinternalandexternal visual 173.34e(13) Noncorrosiveexternalvisual only

10years 5years 5years

173.34e(13) Noncorrosiveexternalvisual only 173.34e(14) AnhydrousAmmonia

5years 10years 5years

173.34e(11) Withwaterjackethydrostatictest 173.34e(11) Withmodifiedhydrostatictest 173.34e(12) With5yearinternalandexternal visual 173.34e(13) Noncorrosiveexternalvisual only 173.34e(19) Extinguishers

12years 5years 10years 5years 12years 5years

173.34e(18) Acetylenecylindershell inspection 173.34e(18) Acetylenecylinderfiller inspection

10years 20years

ParagraphApplications 173.34e(11)Anhydrousdimethylamineanhydrousmethylamineanhydrous trimethylaminemethylchlorideliquefiedpetroleumgasmethylacetylenepropadiene stabilizeddichlorodifluoromethanediflurorethanedifluorochloroethane chlorodifluoromethanechlorotetrafluoroethanetrifluorochloroethyleneormixtures thereoformixturesofoneormorewithtrichlorofluoromethane. Allgasesmustbefreeofcorrodingcomponents. 173.34e(13)AnhydrousammoniaButadiene,inhibitedcyclopropanefluorinated hydrocarbonsandmixturesthereofliquefiedhydrocarbongasliquefiedpetroleumgas methylacetylenepropadiene,stabilizedanhydrousmono,di,trimethylamines ethyleneimine,inhibited.Allgasesmustbefreeofcorrodingcomponents.

173.34e(16)Air,argon,cyclopropane,ethylene,helium,hydrogen,krypton,neon, nitrogen,nitrousoxide,oxygen,sulfurhexafluoride(domestic)/sulphurhexafluoride (international),xenon,permittedmixturesofthesegasesandpermittedmixturesofthese gaseswithupto30percentbyvolumeofcarbondioxide.Alladditionalrequirementsof paragraph173.34e(16)mustbemet. B.RequalificationIdentification.Eachcylinderpassingtherequalificationtestand inspectionmustbemarkedwiththefacilitiesassignedidentificationnumbersetina squarepattern,betweenthemonthandyearoftherequalificationdate.Thisnumbershall bestampedincharactersnotlessthan1/8inchhighwiththefirstcharacteroccupyingthe upperleftcornerofthesquarepattern.Thesecondcharactermustbeintheupperright, thethirdinthelowerright,andthefourthinthelowerleft.Example:Acylinder requalifiedinMay1984andapprovedbyafacilitythathasbeenissuedidentification numberA123wouldbestamped: A1 584 32 Variationsfromthemarkingrequirementsmaybepermitteduponwrittenrequestto,and approvalissuedby,theDirector,OHMT(seesection11).Stampingmustbein accordancewiththelocationrequirementsofthecylinderspecification.Dateofprevious requalificationsmustnotbeobliterated.Cylinderssubjecttoamodifiedrequalification andcylindersthatareexemptfromrequalificationarenotrequiredtobemarkedwitha registrationidentificationnumber. C.RequalificationExemptions.Allcylindersnotexceedinganoutsidediameterof2 inchesandalengthof2feet,andallcylindersdesignated3Eand4Careexemptedfrom hydrostaticrequalification. D.RequalificationRequirements.Therequirementforacylindertoberetestedafterthe expirationofaspecificserviceperiodisfurtherclarifiedtoindicatethatafterthe expirationoftheserviceperiod,thecylindershallnotberechargeduntilthe requalificationisperformed.Thisistoimplythatavisuallyserviceablefullcylinderis consideredfullyserviceableuntiltheproductisexhausted,andthenitcannotberefilled untilarequalificationtestandinspectionisperformed.Anexceptiontothisextensionof theretestperiodforcylindersstillfullofproductisthespecificrequirementsfor cylindersusedasfireextinguishers.Suchcylinders(extinguishers)mustberemoved fromservice,emptied,andrequalifiedatintervalsnottoexceedthoseintervalsspecified inTableL1,Paragraph1910.157f,CFRTitle29. AllperiodscitedhereinmeetorexceedtherequalificationrequirementsoutlinedinTitle 49CFR.DoDactivitieswillrequalifycylindersascitedherein.IMPORTANT:All cylindersm ustberequalifiedbyafacilitythathasbeeninspectedandregisteredwithDOT(see section11).

E.AcetyleneCylinderRequalification(8or8AL). 1.TheownerofaDOT8or8ALcylinderusedinthetransportofflammable acetylenemusthavethecylinder(s)shellandporousfillerrequalifiedinaccordancewith CGAPamphletC13.Therequalificationmustbeperformedbyanapproved requalificationfacilityandinaccordancewiththefollowingschedule:

SHELL REQUALIFICATION Dateofcylinder manufacture Before1Jan1991 Onorafter1Jan1991 InitialInspection SubsequentInspection

Before1Jan2001 10yearsfromDateof manufacture

Every10yearsthereafter Every10yearsthereafter

POROUSFILLER REQUALIFICATION Dateofcylinder manufacture Before1Jan1991 Onorafter1Jan1991 InitialInspection SubsequentInspection

Before1Jan2011 3to20years*

Notrequired Notrequired

*Forcylindersmanufacturedonorafter1Jan1991,requalificationoftheporousfillermustbe performednosoonerthan3years,andnolaterthan20yearsfromthedateofmanufacture.

2.Acetylenecylindersmustberequalifiedbyapersonwhoholdsavalidretesters identificationnumberinconformancewithparagraph173.34e(2)ofTitle49CFR.Each cylindersuccessfullypassingashellorfillerrequalificationmustbemarkedwiththe testersidentificationnumberinaccordancewiththereferencedparagraphofTitle49 CFRandparagraph33Bofthisdocument.In addition,thecylindermustbe appropriatelymarkedtoidentifythetypeofrequalificationperformedinaccordancewith paragraph4.8ofCGAPamphletC13.Forexample,theletterAS@forashell requalificationandtheletterAF@foraporousfillerrequalification. 3.Ifacylindervalveisreplaced,acylindervalveofthesameweightmustbeused,or thetareweightofthecylindermustbeadjustedtocompensateforthevalveweight differential. 34.CYLINDERSVALVES. Thephysicalandfunctionaldesignofthecompressed gascylindervalveiscriticaltoitsdesignatedapplicationwithaspecificgasproduct.

Eachvalveisdesignedwithanoutletconnectionthatwillpreventthecylinderfrombeing coupledtoasystemthatisnotcompatiblewiththegasproduct.Exampleswouldbeto preventanoxidizinggascylinder,suchasonecontainingoxygen,tobeconnectedtoa flammablegassystemsuchasasystemcontainingacetylene,ortopreventalife threateninggasfrombeingconnectedtoamedical,dental,orveterinarygassystemfor respiratoryuse.Cylindervalveoutletconnectionadaptersmustonlybeusedwithinthe samecommoditygroupwithcompatibleapplications.Allvalvesprocuredforuseon GovernmentownedcylindersshallmeetallrequirementsofMILDLT2Series,Valves, CylinderGas(ForCompressedorLiquefiedGases),GeneralSpecifications(andthe specificspecificationsheetswithintheMILDTL2series).Informationonthevarious cylindervalveoutletdesignsandtheirspecificassignedgasapplicationsisprovidedin FederalStandard(FEDSTD)H28,ScrewThreadStandardsforFederalServices,and FEDSTDH28/9,GasCylinderValveOutletandInletThreads.Thesedocuments incorporatethedetaileddesignandmanufacturingrequirementspublishedintheindustry standardidentifiedastheCompressedGasAssociation(CGA)PamphletV1, CompressedGasCylinderValveOutletandInletConnections. A.ValveProcurement.MILDTL2andallofitssupplementaryspecificationsheets havebeendevelopedtoprovideallnecessarydatatocompetitivelyprocurecylinder valvesforeachgasproductusedbytheGovernment.Atypedesignatorhasbeen assignedtoeachvalvethatidentifiesthespecificationsheet,theassignedvalveoutlet connectionnumber,and,ifapplicable,thestandardpressurereliefdevice.Valves installedonGovernmentownedcylindersmaynotalwaysconformtothelatestissueof MILDTL2however,theymusthaveanoutletconnectioncompatiblewiththeproduct containedinthecylinder.Replacementofnonconformingvalvesisonlyrequiredifthe valveisdefective,isnotproperlymarked,doesnothavetheproperoutletconnection,or hasanimproperpressurereliefdevicethatcannotbechanged.Several ofthecompressed gascylindersusedbyDoDhavevalveoutletconnectionsthatarecommonforseveral differentgasesbasedonthepropertiesofthegases.Todetermineasuitableoutlet connectionwhenonecannotbeidentifiedbyvisualinspection,itisrecommendedthata valveoutletconnectionnippleandanutfromaregulatorofaknowncompatible applicationbetriedinorontheoutlet.Thismethodispreferredoverusinganoutletplug orcapbecausesomeconnectionsemploythesamesizethreadbuttheboredepthto accepttheconnectionnippleisdifferenttopreventcrossconnection.Valvedesignand outletconnectionnumberassignmentshavenotbeenaccomplishedonallgasesorgas mixtures.IfavalveanditsspecificdesignhasnotbeenidentifiedinMILDTL2,the propervalveandcylinderassemblyidentificationwillbeobtainedfromDSCRJDT. B.MedicalValves.MaterialssanctionedbytheNationalAeronauticsandSpace Administration(NASA)arespecifiedformedicalcylindervalves.Materialsroutinely usedinthecommercialmarketplace,suchasneoprene,havebeenfoundtobe detrimentalinhighpressureoxygensystems.Valvesthatarechromiumplatedshould possessapprovedmaterials,asrecommendedbyNASA,andasspecifiedforvalves managedbytheDefenseSupplyCenterPhiladelphia(DSCP).Cylindervalveson refillablemedicalgascylindersthatarenotchromiumplatedshallbereplaced.

C.FireExtinguishingSystemCylinderValves.Fireextinguishingsystemcylinder valvesforcarbondioxideandbromotrifluoromethane(Halon1301)willbedifferent. Navyfireextinguishingsystemcylindervalves,asprescribedbyMILV17360for carbondioxide,andMILE24572forHalon1301,willbeused. 35.COLORCODING.Allpersonnelwhohandleorusecompressedgascylinders mustbefamiliarwiththepurposeofcolorcodingcylinderstotherequirementsofMIL STD101B,ColorCodeforPipelinesandforCompressedGasCylinders.Colorcoding isprovidedasahazardwarningandshouldbeusedwithothercharacteristicssuchas physicalsize,valveoutletconnection,nomenclaturestampedonthevalve,nomenclature stenciledonthecylinder,thetype,andtheservicepressureofthecylindertoidentifythe contentsofthecylinder.Theappearanceofanyofthefollowingsixcolorsonthebody ortoporasaband(s)oncompressedgascylindersshallserveasahazardwarning: yellow(flammable),brown(toxicandpoisonous),blue(anestheticandharmful),green (oxidizers),gray(dangerouslyhighpressureandanasphyxiant),andred(fireprotection). Ifthereisanydoubtastothecontentsofthecylinder,DSCRshouldbecontacted immediatelyandthecylindershouldbestoredasapoisongasuntilthecontentsare verified.

SECTION4 INSPECTIONOFCYLINDERS 41.GENERAL.Athoroughandaccurateinspectionsystemisessentialtothesafe handlingandstorageofbothfilledandemptycompressedgascylinders.Theinspection systemimposedbythisregulationhasbeendividedintofiveseparateinspections.These inspectionsareidentifiedas:ReceivingInspection(ContractorReceipts),Receiving Inspection(CustomerReturns),ReceivingInspection(Redistribution),Periodic Inspection,andShippingInspection.Criteriaofthevariousinspectionelementsare presentedinparagraph42below,andtheinspectionelementsastheyapplytothe variousinspectionsareoutlinedinparagraphs43through46below. 42.CRITERIAOFINSPECTIONELEMENTS A.CylinderIdentification.TheassignmentoridentificationofcylinderstoanNSN willbeaccomplishedbyconsideringthefollowingcharacteristics: Shatterable,nonshatterable,and/orimpactresistant. ICC/DOTSpecification. ServicePressure. ColorCode. ValveOutletConnection CylinderDimensions(seeparagraph32C). Chemicaldesignationofthegas Toassistintheproperidentificationofcompressedgascylinders,DSCRhasdevelopeda methodofestablishingaspecificreferencenumber(P/N)thatwillaidin thesearchfor theassignedNSN.Usingthecharacteristicslistedaboveandthetableofapproveditem namecodes(INC)foundintheFederalItemIdentificationGuideNo.T162,areference numbercanbedeveloped. Example:3AA2265/49502/9.25X51540252CF 3AA 2265 49502 9.25x51 540 RepresentstheICCorDOTManufacturingSpec. RepresentstheServicePressureoftheCylinder RepresentstheItemNameCodeforAviators BreathingOxygen Representsthephysicaldimensionsofthe cylinder Representsthevalveoutletconnectionno.for oxygen MilDTL2,andCGAPamphletV1) Representsthecapacityofthecylinderiscubic feet,Thiscanalsoexpressedpounds(lb)for

252CF

liquidfilledcylindersandgallons(gl)for medicalgasesexpressedingallonsofgaseous products.

B.CylinderCount.Verifycylindercounttomakesurethequantityagreeswiththe shippingdocumentation. C.GovernmentOwnership.Overtheyearsandbeforethecentralmanagementof compressedgasesandtheircylinders,eachgovernmentagencymanagedandpurchased theirowncylinders.Toidentifythepurchasingactivityandtheownerofthecylinder, eachagencyobtainedfromthethenInterstateCommerceCommission(ICC),an ownershipdesignationintheformofanumberandadesignatedcode.Thecodecouldbe eitheratrademarkoraseriesoflettersrepresentinganacronymoftheactivity.Someof theagencies,whenpurchasingcylindershadtheirdesignatedcodecombinedintheserial number.Itusuallyappearedasaprefixwiththelettersrunninghorizontalinlinewiththe serialnumber.Inothers,theletterswereputverticallyatthebeginningoftheserial number.Andstillothers,thecodewasjuststampedontheshoulderofthecylinderto showownership.EachcylinderwhichisnowpurchasedcentrallybytheDSCRwillhave aserialnumberthatisprefixedwiththelettersCXtoidentifythepurchasingagency andthelettersUSGOVTstampedintotheshoulderofthecylinderbelowtheserial numbertoshowgovernmentownership.Thefollowinglistprovidesalloftheknown codesthathavebeenusedovertheyearstopurchasecylindersforthevarious governmentagencies.SinceallcylindersarenowcirculatedtoallDODandother governmentagencies,eachcodenowonlyrepresentsthatthecylinderisagovernment ownedcylinder. 1.Cylinderownershipsymbolsthathavebeenusedovertheyearsbyvarious governmentagenciesareasfollows: AF CWSUSA DA EADO FBVE LH LHS MDSFGP MDUSA NFBC TP&USA TPSUSA USA USAF U.S.AIRFORCE CHEMICALWARFARESERVICE DEPTOFTHEARMY CORPOFENG.U.S.ARMY TREASURYDEPT. DEPTOFCOMMERCE, LIGHTHOUSEDIST. U.S.DEPTFORCOMMERCE, LIGHTHOUSEDIST DEFENSELOGISTICSAGENCY DEFENSELOGISTICSAGENCY U.S.ENGINEERCORPS. TREASURYDEPT TREASURYDEPT USARMY USAIRFORCE

USARMY USBM USBOM USBR

USARMY U.S.BUREAUOFMINES U.S.BUREAUOFMINES DEPTOFINTERIOR, BUREAUOFRECLAMATION USCEC U.S.CORPSOFENGS,DEPTOFARMY USCG U.S.COASTGUARD USDA U.S.DEPTOFAGRICULTURE USDANU U.S.DEPTOFAGRICULTURE USDAARC U.S.DEPTOFAGRICULTURE AGRICULTURERESEARCHCENTER USDABACE U.S.DEPTOFAGRICULTURE, BUREAUOFAGRICULTURE CHEM.&ENG USDABEPB U.S.DEPTOFAGRICULTURE BUREAUOFENTOMOLOGY&PLANT QUARANTINE USDAFS U.S.DEPTOFAGRICULTURE BUREAUOFSOILS USDANRRL U.S.DEPTOFAGRICULTURE AGRICULTURERES.ADMINISTRATION USDASCS U.S.DEPTOFAGRICULTURE SOILCONSERVATIONSERVICES USECP ENG.CORP,USARMY. USED U.S.ENGCORPS. USGOVT DEFENSELOGISTICSAGENCY USLHS U.S.DEPTOFCOMMERCE, LIGHTHOUSEDIST. USN U.S.NAVY USNAVY U.S.NAVY USSIGC U.S.SIGNALCORPS. WD WARDEPTU.S.ARMY WDE U.S.ENG.OFFICE2.ThetotalnameofaDoDorothergovernmentagencymay bestampedintotheshoulderofthe cylinderorembossedontheneckringofthecylinder.

3.AmilitaryorFederalspecificationnumbermaybestampedintotheshoulderof thecylinderwhenthecylinderismanufacturedtoaspecificMilorFedSpecificationin additiontoorinlieuofaDOTspecification.(SeeParagraph32a) 4.Cylindersthatarenotidentifiedbyoneoftheabovecriteriawillbeplacedin ConditionCodeJ,andtheproperownershipwillbedetermined.DSCRJDTA(DSN 6953230)hasadatabaseofapproximately10,000militaryandcommercialownership symbolsthathavebeencompiledbytheDOT.Thesecodesrepresenttheownership

codesthathavebeenrecordedfromtheveryfirstassignedcodethroughtheyear1969, when DOTnolongerrecordedthecodes.Newlyassignedcodesfromthatpointintimeonare nowrecordedbytheCompressedGasAssociation.Thesecodesarerecordedand publishedintheCGAPamphletsC16andC16.1.Ifthepersonhavingcustodyofthe cylindercanidentifyallofthemarkingontheshoulderofthecylinder,usuallythe rightfulownerofthecylindercanbefound.Itwillbeuptothepersonhavingcustodyof thecylindertonotifytheownerforthereturnofthecylinder. D.Obsolete,Unserviceable,andUnauthorizedCylinders.Thefollowingcylinderswill beconsideredunserviceableregardlessoftheirphysicalappearanceandshallberemoved fromservice: 1.AllcylindersmanufacturedbyTaylorDivision,CuneoPress.Thesecylinders maybeidentifiedbythesymbol"cTd"stampedunderorneartheserialnumberor hydrostatictestdate. 2.CylindersmanufacturedbytheTaylorWhartonIronandSteelCompanyduring theperiod1942to1944,withaservicepressurethathasbeenincreasedfrom1800to 2015psig.Thesecylinderswillhavethemanufacturer'ssymbolof"TW"stampednear theserialnumberontheshoulderofthecylinderandtherewillbeevidencethatthe servicepressurehasbeenrestampedto2015.Thedateofmanufactureisidentifiedasthe earliesthydrostatictestdatefoundonthecylinder. 3.Cylindersnotmanufactured,inspected,andtestedinaccordancewiththe applicableDOTspecificationsassetforthinTitle49CFR,Part178,SubpartC,and requalified(retested)inaccordancewithTitle49CFR,Section173.34(seeparagraph3 2).Acylinderthathasbeenmanufacturedbyanapprovedsourcewillcontainatleastthe permanentmarkingsrequiredbyTitle49CFR.Thesemarkingsmustinclude:(1) aDOT specificationnumberfollowedbytheservicepressure,(2)aserialnumberfollowedbyan identifyingsymbolofthemakerorpurchaser,and(3)anapprovedinspector'sofficial markandthedateoftest.Anexceptiontothiswillbecylindersthathavebeen manufacturedtoaMilitarySpecificationforaspecificmilitaryapplication.Insuchcases theMilSpecwillbestampedonthecylinderinlieuoftheDOTspecification.Theretest criteriashallbebasedonthecylinderdesignanditsapplicationascitedinthedesign specification. E.PhysicalCondition.Allcylindersshallbevisuallyinspectedforphysicaldefectsas outlinedinCGAPamphletsC6,StandardsforVisualInspectionofCompressedGas CylindersC6.1,StandardsforVisual InspectionofHighPressureAluminum CompressedGasCylindersC6.2,GuidelinesforVisualInspectionandRequalification ofFiberReinforcedHighPressureCylindersC6.3,GuidelinesforVisualinspectionand RequalificationofLowPressureAluminumCompressedGasCylindersandC13, GuidelinesforVisualInspectionandRequalificationofAcetyleneCylinders.Cylinders withdefectsequaltoorgreaterthanthelimitsimposedbytheCGAPamphletsshallbe condemnedandaDDForm1577,Unserviceable(Condemned)Tag Materiel,attached

tothecylinder.ThevisualinspectionrequirementscitedaboveandreferencedinCGA pamphletC6arealsofoundindetailinAirForceTechnicalOrderTO42B512,Gas Cylinders(StorageType),Use,Handling,andMaintenance(alsoNAVAIR06202). EitherdocumentmaybeusedbyDoDactivitieswhenperformingavisualinspection. F.PermanentMarkings.Thepermanentmarkingrequirementsforcompressedgas cylindersarefoundintheapplicableDOTspecificationinPart178ofTitle49CFRand intheGovernmentprocurementspecification.Thesemarkingsmustbemaintainedin legibleconditionasrequiredbyPart173ofTitle49CFR. G.ExteriorFinish.Thequalityoftheexteriorfinishshallbebasedonthefollowing criteria: 1.Rust,scale,cakedpaint,andallremnantsofadhesivelabelsordecalswillbe removedpriortopaintingasoutlinedinMILSTD1411,Notice1,Inspectionand MaintenanceofCompressedGasCylinders. 2.Thecorrectprimerandpaintwillbeproperlyanduniformlyappliedinaccordance withMILSTD1411,Notice1. 3.Thepropercolorcodeandchemicaldesignationfortheproductcontainedinthe cylindershallbeinaccordancewithMILSTD101B,ColorCodeforPipelinesandfor CompressedGasCylinders. 4.Thecolorbandsandstencilingaresharpanddistinct,ofpropersize,andinthe correctlocation. H.RequalificationInspectionandTest.Requirementsareasfollows: 1.Requalificationrequirementsshallbedeterminedusingthecriteriacitedin paragraph33D. 2.RequalificationshallbeaccomplishedinaccordancewithTitle49CFRandCGA PamphletC1,MethodsforHydrostaticTestingofCompressedGasCylindersandC13 GuidelinesforVisualInspectionandRequalificationofAcetyleneCylinders. 3.Therequalificationmustbeperformedbyfacilitiesthathavebeenapprovedand registeredwithDOT. 4.Cylindersshallberequalified,modified,andmarkedtopermitchargingtoa pressure10percentinexcessoftheirmarkedservicepressureonlywhenspecifiedinthe contractordeliveryorderandwhenalldatanecessarytosatisfytherequirementsofTitle 49CFR,Section173.3028areavailableandthecylinderisequippedwithafrangible typepressurereliefdeviceratedforusewiththeservicepressureofthecylinder.The rupturepressureratingforthefrangiblediskisstampedonthecap,whichholdsthedisk inplace.

5.Therequalificationdaterepresentedbythemonthandyearmustbestampedinto theshoulderofthecylinder.TheDOTapprovedregistrationdesignationofthe requalifyingfacilitymustbestampedbetweenthemonthandyear. I.ValvesorPlugs.Requirementsareasfollows: 1. ValvesinstalledinGovernmentownedcylinderswillbeconsideredacceptablefor furtheruseprovided: a.Theyareserviceableandfunctionallyequaltonewvalvesinoperationand cleanliness. b.Theyareequippedwithafullyserviceableandproperlyratedpressurerelief deviceforthecylinderinwhichtheyareorwillbeinstalled. c.TheyareequippedwiththeproperCGAvalveoutletconnectionfortheMIL DTL2valvetypespecifiedforthecylinderassembly(specificgasapplication). d.Theiridentification(ifany)onthesideofthevalveisthatofthedesignated compressedgasapplicationandiscompatiblewiththeoutletconnection.Ifthevalveis otherwiseacceptablebutunmarked,thenameofthegas(seeMILDTL2)shallbe appliedbymeansofadecal.Fireextinguishingsystemcylinders,CO2andHalon,donot haveMILDTL2typevalves. 2.Theuseofacombinationfrangiblediskfusibleplugtypepressurereliefdevice withastampedburstingpressureof3000psigandatemperatureof165F(TypeS4)or 212F(TypeS5)isauthorizedforcylinderswithservicepressuresof1800through2400 psig.ThisdevicemeetsallrequirementsofbothDOTandCGAforhighpressuregas applications(seeMILDTL2forauthorizedapplications).Itisnotedthatthisdevice cannotbeusedforanycryogenicapplicationorwithanycylinderthathasbeen requalifiedandstamped(+markafterthelastretestdate)for10percentover pressurization. Type1pressurereliefdevicesmustbeusedwithsuchcylinders.(NOTE: Certaingasesmustbechargedintocylinderswithoutapressurereliefdeviceandmust havevalveprotectioncaps,e.g.,phosgene.) 3.Valvesshallbefreeofinsects,insectwebs,dirt,corrosion,oil,orgrease.The bore,thethroatandthethreadsofthevalveoutletshallbefreeofanypaintsplatteror overspraycausedbylackofprotectionwhenpaintingthecylinder.Thereshallbe minimalconcernforpaintonotherpartsofthevalveunlessiteffectsitsoperation.Do notmistakethreadcompoundasoilorgreaseorviceversa. 4.MetalvalveoutletcapsorplugsasspecifiedinMILDTL2,designedtoforma secondaryseal,arerequiredonfullchlorineandphosgenecylinders.Valveoutlet caps/plugsdesignedtopreventcontaminationofthevalveoutletportarerequiredon cylindersofaviator'sbreathingandmedicaloxygen,medicalcarbondioxide,medical

oxygenheliummixtures,nitrousoxide,andairforrespiration(humanorveterinary). Valveoutletcaps/plugsarenotmandatoryoncertainemptycylindershowever,ifa cap/plugisattachedtothecylinder,itshallbesecurelyinstalledonthevalveoutlet. Additionalrequirementsforcapsandplugsareatthediscretionofthe