GuidelineNo.:B-05(202511)

B-05SEAMLESSSTEELGAS

CYLINDERS

Issueddate:November01,2025

?ChinaClassificationSociety

Foreword

ChinaClassificationSociety(hereinafterreferredtoasCCS)ProductInspectionandTestingGuideline(hereinafterreferredtoasthisGuideline)containsthetechnicalrequirements,inspectionandtestingcriteriarelatedtoclassificationandstatutorysurveyofmarineproductstobeappliedforCCSapproval/inspection.

ThisGuidelinefreestheuserstoadoptothertestmethodsandrequirementswhichareequivalenttoorarestricterthanthisGuideline.

ThisGuidelineispublishedandupdatedbyCCS,andisreleasedat

.Yourcommentsorsuggestionsarewelcomedandmaybesenttoouremailaddressed

service@

.

Historicalversionsandreleasedate: B05(201510),October20,2015

B-05(201705),May9,2017

B-05(202211),November15,2022

Mainchanges:

Addthetestitem‘Bottomsealingtest(onlyapplicabletothebottomofcylindersmadeofsteelpipes)’intoTable7.2.

Textmodification.

B-05(202511)SEAMLESSSTEELGASCYLINDERS

10/13

CONTENTS

Application

4

Normativereferences

4

Termsanddefinitions

4

Drawingsanddocuments

5

Technicalrequirements

6

Materialsandcomponents

6

Typetest

9

Unit/batchinspection

1

2

SEAMLESSSTEELGASCYLINDERS

Application

Thisguidelineisapplicabletotheworksapprovalandunit/pathinspectionofrefillableseamlesssteelgascylindersforshipswhichareusedforcontainingcompressed,liquefiedanddissolvedgasesandforquenchedandtemperedsteelcylinderswithamaximumactualtensilestrengthoflessthan1100MPa,andwithwatercapacitiesuptoandincluding450L,andaserviceenvironmenttemperatureshallmeettherequirements.

Thisguidelineisnotapplicabletotheseamlesssteelgascylindersusedforcontainingdissolvedgasesandadsorbedgasesandcylinderpressurevesselsmountedasaccessoryontransportvehiclesandmachineryinstallations.Seamlesssteelgascylindersarenottobeusedforcontainingthemediahavingstresscorrosiontendency.

Thisguidelineisinprincipleonlyapplicabletotheapprovalandunit/pathinspectionofthebodyofseamlesssteelgascylinders,notforheadvalves.

Thisguidelineisapplicabletotheseamlesssteelgascylindersusedonships,Seamlesssteelgascylindersforoffshoreinstallationsandetc.canrefertothisGuideline.

UpontheapprovalofCCS,seamlesssteelgascylindersmaybeapprovedandunit/pathinspectedinaccordancewiththetechnicalrequirementsofrecognizedstandards.

Seamlesssteelgascylindersforspecificpurposesshallcomplywiththerequirementsofrelevantconventions,regulations,rulesandrelevantstandardsforspecificpurposes.Forexample,seamlesssteelgascylindersforinflationsystemsofinflatableliferaftsshallcomplywiththerelevantrequirementsoftheInternationalLife-savingApplianceCode.

Normativereferences

Chapter2,PartSixofChinaClassificationSocietyRulesforClassificationofSea-goingSteelShips

ISO9809-1:2019Gascylinders—Design,constructionandtestingofrefillableseamlesssteelgascylindersandtubes—Part1:Quenchedandtemperedsteelcylindersandtubeswithtensilestrengthlessthan1100MPa.

Termsanddefinitions

Forthepurposeofthisguideline,thefollowingdefinitionsareused:

HydraulictestpressurePh:thepressuretobereachedduringhydraulictest.

Yieldstrength:theupperyieldstrengthistobetakenwherethematerialtestspecimenexhibitsapparentyieldingduringthetensiletest;wherethetestspecimendoesnotexhibitapparentyielding,thespecifiednon-proportionalelongationstrengthunderthetestforce,

Rp0.2,istobetakenastheyieldstrengthofthematerial.

Batchquantity:thespecifiedquantityofsteelcylinderswhichadoptthesamedesignconditions,havethesamenominaldiameteranddesignwallthickness,aremadeofsteelofthesameheat/furnacenumberbythesamemanufacturingprocess,andarecontinuouslyheattreatedinaccordancewiththesameheattreatmentspecifications.Forquenchedandtemperedsteelcylinders,abatchcorrespondstoaquantityofnotlessthan200plusthenumberofsteelcylindersusedfordestructivetest.

Fillingratio:themaximumallowableweightofgastobefilledperunitwatercapacityofthesteelcylinderspecifiedintheapplicablestandardsforvariousfilledmedia.

BurstpressurePb:themaximumpressureofgascylindersreachedduringbursttest.

Drawingsanddocumentation

ThefollowingdrawingsanddocumentationtobesubmittedaretobesubmittedtoCCSforapproval:

Seamlesssteelgascylinderdrawings.Drawingsaretoreflecttheproducts’structuralform,maindimensions,materials,mechanicalandchemicalparameters,manufacturingandheattreatmentmethods,nominalworkingpressure,hydraulictestpressureandotherspecialtechnicalrequirements;

Seamlesssteelgascylinderdesigncalculations.Relevantcalculations,includingstrengthcalculationsofcylinderbody,baseandhead,aretobemadeinaccordancewiththedesignstandard;

Typetestplan.

Thefollowingdrawingsanddocumentationtobesubmittedaretobesubmittedforreviewwhentheinitialworksapprovalisbeingappliedfor:

Basicinformationofthemanufacturer:name,addressandproductionhistoryofthemanufacturer,typesandspecificationsofcurrentproducts,thetypes,specificationsanddeliveryconditionsoftheproductsforwhichapprovalisbeingapplied,informationonothercertificationorqualificationcertificatesobtained,etc.;

Qualitysystemdocumentsandothermanagementdocuments.Theorganizationsofthequalitysystemandproductqualitycontrolpointsaretobeclearlydefinedinthesedocuments;

Mainproduction,measuring/testingequipment.

Listofmainproductionequipment:Formingequipment;

Heattreatmentfurnace’stype,dimensions,heatingmethod,temperaturecontrollingandrecordingmethod,andarrangementoftemperaturemeasuringpoints.

Listofmainmeasuring/testingequipment

Listofequipmentforchemicalcomponentsanalysis,mechanicalproperties,mechanicaltest,metallographictest,NDT,hydraulictest,etc.(includingtheproductname,type,manufacturer,statutoryinspectionorganizationandvalidperiodofverification/calibration)

Processdocuments:

Productionprocessflowchart(qualitycontrolpointsaretobeindicated);

Operationguidancebookswithvariousworkproceduresindicatedinproductionprocessflowchart,includingthemainworkproceduressuchasforming,heattreatment,NDT,etc.;

Qualificationcertificatesoftestingandinspectionpersonnel;

Testlocationandlaboratoryqualifications(wherethetestissubcontracted,thequalificationofthesubcontractorandsubcontractagreementaretobedescribed).

Listofsuppliersofmaterialsandmainparts;

Productdescriptionandqualitycertificates(sample).

Technicalrequirements

Generaldesignrequirements

Thedesignformulausedtodeterminethewallthicknessofcylinderbodyistocomplywiththerequirementsofrecognizedstandards(e.g.ISO9809-1).

Theguaranteevalueoftheyieldstrengthofheattreatedmaterial,Reg,istobetakenfordesignofwallthicknessofpartsunderpressure,andthelimitoftheratioofyieldstrengthguaranteevalueRegtotensilestrengthguaranteevalueRmgistocomplywiththerequirementsofthestandards;

ThedesignandcalculationofthewallthicknessofthebottlebodyshallbesubjecttothehydrostatictestpressurePh;thehydraulictestpressureofthecylinderis1.5timesofthenominalworkingpressure

Ingeneral,morethantwoopeningsonagascylinderarenotallowed,andtheopeningscanonlybedesignedtobearrangedalongtheneutralaxisofthegascylinder.

ForCrMosteel,theactualmaximumtensilestrengthofcylinderbodymaterialRmaisgenerallynottoexceed1100MPa;forCMnsteel,theactualmaximumtensilestrengthRmaisnottoexceed1030MPa.Forcylindersfilledwiththemediumposingariskofhydrogenembrittlement,theactualmaximumtensilestrengthofcylinderbodymaterialRmaisgenerallynottoexceed

880MPa,ormaynotexceed950Mpawhentheactualyield-strengthratioisnotmorethan0.9.

Thebottomstructureofseamlesssteelcylindersistocomplywiththefollowingrequirements:

Thestructuralformanddimensionsaretocomplywiththerequirementsofrelevantstandards;

Thepartinconnectiontoconvexbaseistobesmoothanditsthicknessistobenolessthanthedesignthicknessofthecylinderbody;

Thereistobeatransitionalsectionbetweentheannulatedshellofconcavebaseandthecylinderbody.Theconnectionoftransitionalsectiontocylinderbodyistobesmooth.

Thedesignofconvexbaseandconcavebaseistobesubjecttofatiguetestbymeansofcyclicpressurization.Thedesignofcylinderbasesisconsideredqualifiedprovidedthatthecylinderbasescanwithstand80000cyclesofpressurizationwiththeupperlimitofcyclicpressurebeingatthenominalworkingpressure,or12000cyclesofpressurizationwiththeupperlimitofcyclicpressurebeingatthetestpressure,Orforcylinderswithahydraulictestpressureph＞450bar,theuppercyclicpressuremaybereducedtotwothirdsofthistestpressure.Inthiscase,thecylindersshallwithstand80000cycleswithoutbeingdamaged,thedesignisnottobeadoptedifthecylinderbaseshavenotpassedthesaidtestsuccessfully.

Thethicknessofsteelcylinderopeningistobemeasuredinordertoensurethattheopeningwillnotbedeformedwhensubjecttothemomentofvalve-tighteningforcecoupleandtheadditionalexternalforceofneckringriveting.

Theinternalthreadsofcylinderopeningsaretocomplywiththefollowingrequirements:

Thethreadaretocomplywiththerequirementsofrecognizedstandards.

Thenumberofusefulordinarythreadsistobesuchthattheshearsafetyfactorcalculatedatthehydraulictestpressureofsteelcylinder,Ph,isatleast10,andnolessthan6.

Generalrequirementsformanufacturing

Themanufactureofmarineseamlesssteelgascylinders,inspections/testsuponcompletionaretocomplywiththerequirementsofCCSRulesforClassificationofSea-goingSteelShips,approveddrawingsandrelevantstandards.

Themanufacturersofmarineseamlesssteelgascylindersaretointroducethemanufacturingprocess,describethemanufacturingtoolshavingsignificantimpactonproductqualitysuchasthepressheadforaircylinderpressinganddrawing,moldplateormoldtoolforshellnosingduringrotarypressingormoldpressing,andspecifyotherrequirementsforprocessverificationbeforetheproductisputintoservice,regularinspection,repairandreplacementwhentheproductisinservice,etc.

Thecylinderbodyisnotallowedtobeweldedorrepaired.Thecrack,inclusion,nonfusionandotherdefectsontheinnersurfaceofthecylinderfromthetubeshallberemovedbymechanicalmillingandothermethods.Thetreatmentofsurfacedefectsofthecylinderbodyshallcomplywiththerequirementsofrelevantrecognizedstandardsforgascylinders.

Thefillingratioistobeconsistentwiththestrengthofcylinderbodyandalsocomplywiththerequirementsoftheconventions,regulations,rulesandrecognizedstandardsinvolvedintheuseofgascylinders.

Materialsandcomponents

Thematerialusedforthemanufactureofgascylindersshallbesteel,otherthanrimmingquality,withnon-ageingpropertiesandshallbefullykilledwithaluminiumand/orsilicon.Incaseswhereexaminationofthisnon-ageingpropertyisrequiredbythecustomer,thecriteriabywhichitistobespecifiedshouldbeagreedwiththecustomerandinsertedintheorder.

Thematerialofcylinderbodyistobecompatiblewiththegasintendedtobefilled.RefertoISO11114-1forcompatibilityofcylindermaterialwiththegas;

TheSelementcontent(massfraction)ofthecylinderbodymaterialobtainedthroughheatanalysisisnottoexceed0.010%andthePelementcontent(massfraction)thereofobtainedthroughheatanalysisisnottoexceed0.020%.AndthesumofS+Pcontentpercentagesisnottoexceed0.025%;

Thelimitvalues(thedifferencebetweenthemaximumcontentandtheminimumcontent)ofthechemicalcompositionofcylinderbodymaterialarenottoexceedthevalueslistedinthetable

below:

ChemicalCompositionTable Table6.4

Element

Maximumcontent(massfraction),%

Limitvalue(massfraction),%

C

<0.30

0.06

≥0.30

0.07

Mn

--

0.30

Si

--

0.30

Cr*

<1.50

0.30

≥1.50

0.50

Ni*

--

0.40

Mo*

--

0.15

Notes: ①Therequirementsinthetableabovemustbecompliedwithwheretheelementmarkedby“*”arealloyelementsofthesteel;

②Themaximumcontentofanyintentionallyaddedelementistobereported;

③TotalcontentofV+Ni+Ti+B+Zrisnottoexceed0.15%.

Thecylinderbodyisgenerallytobemanufacturedwithnationallyorinternationallyrecognizedsteelusedforcylinders.TypicalrecognizedsteelsincludeCrMosteelandCMnsteel.

Roughrolledbilletsorsteelbilletsaretobesubjecttomacrostructureexaminationanddefectssuchasflakers,residualshrinkagecavity,delamination,airbubble,foreignmattersandimpurityinclusionarenotallowed.Thecenterporosityistobenogreaterthangrade1.5andsegregationnogreaterthangrade2.5.Forseamlesssteelpipes,thewallthicknessdeviationisnottoexceed

-10%~+15%ofthenominalwallthicknessandthesteelpipesaretobe100%satisfiedbyUT.

Typetest

Samplingprincipleoftypetest

Seamlesssteelcylindersaretobetypetestedaccordingtodifferenttypes.Cylindersareconsideredtobeofdifferenttypesinanyoneofthefollowingcases:

Productionprocessflowisdifferent;

Materialdesignationisdifferent;

Heattreatmentprocessisdifferent;

Structuralformofcylinderbottomandratioofbottomthicknesstocylinderdiameteraredifferent;

Theoveralllengthofthecylinderhasincreasedbymorethan50%(cylinderswithalength/diameterratiolessthan3shallnotbeusedasreferencecylindersforanynewdesignwiththisratiogreaterthan3);

Theoutsidediameterorminimumguaranteethicknessofthecylinderisdifferent;

Thehydraulictestpressureisdifferent(thedesignonthesamebasiswithonlyhydraulictestpressurebeingreducedisnottobeconsideredasnewdesign);

Theminimumguaranteedyieldstrengthand/orminimumguaranteedtensilestrengtharedifferent.

Incaseoftaperedthreadsthetorquetestshallbeperformed;incaseofparallelthreadsthecalculationoftheshearstrengthshallbeperformed,ifthediameteroftheinternalthreadhasincreasedby50%ormore,thepressurecyclingtestontwocylindersshallalsobeperformed.

Foreachtypeofgascylindersforwhichapprovalistobeapplied,atleast50gascylindersaretobemanufacturedbytheapplicantandtestedinaccordancewiththecorrespondingrequirementsofthetablein7.2.

Formarineseamlesssteelgascylindersfortypetest,theacceptanceofrawmaterials,mainmanufacturingprocess,inspectionandtest,andtransferofrelevantmarksmustbecarriedoutunderthesupervisionofthesurveyorandtheresultsthereofaretocomplywiththerequirementsofCCSRulesforClassificationofSea-goingSteelShipsandapproveddrawings.

Typetestitemsandrequirements

Typetestitemsandrequirements Table7.2

Testitem

Testquantity

Testrequirements

Rawmaterialinspection

Eachheatoreachbatch

Eachbatchofrawmaterialsaretobefurnishedwithproductqualitycertificates;

ElementstobeanalyzedaretoincludeC,Si,Mn,P,S,Nb,V,Ti,Cr,Ni,Mo,Cu,Al,B,Zr,andpurposefullyaddedelements;

Forseamlesssteelpipes,visualinspection,wallthickness

inspection;

Internalandexternalvisualinspectionof

gascylinders

Eachcylinder

Theinternalandexternalsurfacesoffinishedgascylindersarefreeofdefectsthatmayaffectthesafeuseofgascylinders,for

details,see8.3ofISO9809-1:2019.

Inspectionofdimension,shapeandpositiontolerances,neckthreadsinspection

Eachcylinder

Dimensionalinspection:

Foreachcylinderfortypetest,wallthickness,outerdiameterandheightofcylinderbody,thicknessandcentraldepth(applicabletoconcavebase)ofcylinderbasearetobemeasured.Theresultsaretobeconsistentwiththerequirementsof7.3~7.6,8.1,8.2ofISO9809-1:2019andCCSapproveddrawings.

Thethicknessandouterdiameterofthetwocylindersformechanicalpropertytestshallalsobemeasuredaccordingto

7.3to7.6,8.1and8.2ofISO9809-1:2019andtheapproveddrawings,foreachsteelcylinder,threecrosssections,namelytheupper,middleandlowercrosssections,aretobetakenalongthelengthofcylinderbody.Thewallthicknessandouterdiameteraretobemeasuredrespectively.Wallthicknessofeachcrosssectionistobemeasuredatfourmeasuringpointsevenlydistributedalongthecircumference.Theouterdiameteristobemeasuredfortwotimesverticallyandcrosswise.Thethicknessofcylinderbaseistobemeasuredatonemeasuringpointlocatedinthecenterofthebase.Forconcavebase,thethicknessoftheearthingpointisalsotobemeasuredatthefourmeasuringpointsevenlydistributedalongthecircumference.Thewallthicknessmeasuredatvariouspointsistobenolessthantheminimumthicknessguaranteevalue.

2.Formandpositiontolerancesaretocomplywiththerequirementsof8.5~8.9ofISO9809-1:2019.

3.Neckthreadsinspectionshallconformtotherequirementsof8.9ofISO9809-1:2019.

Testitem

Testquantity

Testrequirements

Hardnesstest

Eachcylinder

Hardnessistobetestedatthreepointsrespectivelylocatedintheupper,middleandlowerportionsofthecylinderbodyandtheresultsaretobeconsistentwiththerequirementsof11.3of

ISO9809-1:2019andapproveddrawings.

Ultrasonictest

Eachcylinder

Tobeinaccordancewith8.4ofISO9809-1:2019orrelevantrecognizedstandards.

Magneticparticleinspection(whenapplicable)

Eachcylinder

Ifrequiredbythestandardsthatadopted,theresultsshallconformtotherequirementsofthestandards.

Tensiletest

2cylinderstobetakenrandomly

1test

pieces/cylinder

Tobeinaccordancewith10.2ofISO9809-1:2019and

approveddrawings.

Bendingorflatteningtest

Bending:2testpieces/cylinder,flattening/ringflattening:1test

piece/cylinder

Tobeinaccordancewith9.2.4ofISO9809-1:2019.

Impacttest

1group3test

pieces/cylinder

Tobeinaccordancewith10.3ofISO9809-1:2019and

approveddrawings.

Basecheck

1test

piece/cylinder

Tobeinaccordancewith9.2.3ofISO9809-1:2019.

Hydraulicbursttest

2cylinderstobetaken

randomly

Tobeinaccordancewith10.4ofISO9809-1:2019.

Pressurecyclingtest

3cylinderstobetaken

randomly

Tobeinaccordancewith9.2.2ofISO9809-1:2019.

Hydraulictestand

Capacitycheck

Eachcylinder

Tobeinaccordancewith11.2,11.5ofISO9809-1:2019.

Neckringtorquetest

(whenapplicable)

1cylindertobetakenrandomly

Tobeinaccordancewith7.8ofISO9809-1:2019.

Torquetestfortaper

threadonly

1cylindertobetakenrandomly

Tobeinaccordancewith9.2.5ofISO9809-1:2019.

Bottomsealingtest(onlyapplicabletothebottomofcylindersmadeofsteelpipes)

Eachcylinder

Anappropriatetestdeviceisusedtopressurizethecentralareaoftheinnersurfaceofthebottomofthecylinder,Thepressurizedareashouldbeatleast1/16ofthebottomareaofthecylinder,andthediameterofthepressurizedareashouldbeatleast20mm.,Thetestmediumcanbecleanairornitrogen.Thetestpressureisthenominalworkingpressureof

thecylinder,andtheholdingtimeisnotlessthan1min.Thetestareaatthebottomofthecylinderissubmergedinwaterandthereshallbenoleakage.Thistestcanbereplacedbyan

overallairtightnesstest.

Testitem

Testquantity

Testrequirements

Airtightnesstest(when

applicable)

Eachcylinder

Ifrequiredbytheapprovedstandards,theresultsshall

conformtotherequirementsofrelevantrecognizedstandards.

Unit/batchinspection

Generally,unit/batchinspectionofmarineseamlesssteelgascylindersistobecarriedoutafterworksapproval,theunit/batchinspectionofunapprovedseamlesssteelgascylindersistobecarriedoutaccordingtotherequirementsfortypetestofthisguideline.

Theunit/batchinspection(see3.1(6)forthedefinitionofbatchquantity)ofseamlesssteelgascylindersafterCCSapprovalistobecarriedoutinaccordancewiththeproductinspectionplanalreadyapprovedduringtheapproval.Thetestitemslistedinthetable8.2aretobeincluded:

Typetestitemsandrequirements Table8.2

Testitem

Testquantity

Rawmaterialinspection

Eachheatoreachbatch

Internalandexternalvisual

inspectionofcylinder

Eachcylinder

Inspectionofdimension,shape

andpositiontolerances,neckthreadsinspection

Eachcylinder

Hardnesstest(at1measuring

pointonthecylinderbody)

Eachcylinder

Ultrasonictest

Eachcylinder

Tensiletest

1cylinder/batch

1time

Bendingorflatteningtest(when

applicable)

Bending:2times

Flattening/ringflattening:1time

Impacttest

1group3times

Bursttest

1cylinder/batch

HydraulictestandCapacity

check

Randominspection

Dissectiontestofcylinderbase

(whenapplicable)

1cylinder/batch

Bottomsealingtest(onlyapplicabletothebott