Transportable gas cylinders - Specification for the design and construction of refillable transportable seamless normalized carbon manganese steel gas cylinders of water capacity up to 0,5 litre for compressed, liquefied and dissolved gases and up to 1 litre for carbon dioxide

This draft standard sets out minimum requirements for the material design, construction and workmanship, manufacturing processes and tests at manufacture of refillable seamless normalized gas cylinders made from carbon manganese steel of water capacities up to and including 0,5 litre for permanent, liquefiable and dissolved gases and up to 1 litre for carbon dioxide use only.

Ortsbewegliche Gasflaschen - Konstruktion und Aufbau von wiederbefüllbaren ortsbeweglichen Gasflaschen aus nahtlosem normalgeglühtem Kohlenstoff-Mangan-Stahl mit einem Fassungsraum bis 0,5 Liter für verdichtete, verflüssigte und unter Druck gelöste Gase und bis 1 Liter für Kohlendioxid

Diese Norm legt Mindestanforderungen bezüglich Werkstoff, der Gestaltung, Konstruktion und Verfahren, Herstellungsprozesse und Versuche bei der Herstellung von wiederbefüllbaren nahtlosen normalgeglühtem Gasflaschen aus Kohlenstoff-Mangan-Stahl mit einem Fassungsraum bis einschließlich 0,5 Liter für verdichtete, verflüssigte und unter Druck gelöste Gase und bis einschließlich 1 Liter für Kohlendioxid.
Diese Norm gilt für Gasflaschen aus normalgeglühtem Kohlenstoff-Mangan-Stahl mit einem  - Wert von weniger als 850 MPa.

Bouteilles à gaz transportables - Spécifications pour la conception et la fabrication de bouteilles à gaz rechargeables et transportables sans soudure en acier au carbone manganèse normalisé, de capacité de l'eau jusqu'à 0,5 litre pour gaz comprimés, liquéfiés et dissous et jusqu'à 1 litre pour le dioxyde de carbone

La présente Nnorme européenne définit les exigences minimales concernant la conception du matériau, la construction et l'exécution, les procédés de fabrication et les essais lors de la fabrication des bouteilles à gaz rechargeables sans soudure,, en acier au carbone manganèse normalisé, de capacité en eau jusqu'à 0,5 l pour les gaz comprimés, liquéfiés et dissous, et jusqu'à 1 l pour le dioxyde de carbone.
La présente nnorme est applicable aux bouteilles en acier au carbone manganèse normalisé présentant une valeur Rm inférieure à 850 MPa.

Premične plinske jeklenke - Specifikacija za konstruiranje in izdelavo ponovno polnljivih jeklenk iz celega iz normaliziranega jekla z vodno prostornino do 0,5 litra za stisnjene, utekočinjene in pod tlakom raztopljene pline ter do 1 litra za ogljikov dioksid

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Published
Publication Date
15-Oct-2002
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Completion Date
22-Nov-2007

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Ortsbewegliche Gasflaschen - Konstruktion und Aufbau von wiederbefüllbaren ortsbeweglichen Gasflaschen aus nahtlosem normalgeglühtem Kohlenstoff-Mangan-Stahl mit einem Fassungsraum bis 0,5 Liter für verdichtete, verflüssigte und unter Druck gelöste Gase und bis 1 Liter für KohlendioxidBouteilles a gaz transportables - Spécifications pour la conception et la fabrication de bouteilles a gaz rechargeables et transportables sans soudure en acier au carbone manganese normalisé, de capacité de l'eau jusqu'a 0,5 litre pour gaz comprimés, liquéfiés et dissous et jusqu'a 1 litre pour le dioxyde de carboneTransportable gas cylinders - Specification for the design and construction of refillable transportable seamless normalized carbon manganese steel gas cylinders of water capacity up to 0,5 litre for compressed, liquefied and dissolved gases and up to 1 litre for carbon dioxide23.020.30MHNOHQNHPressure vessels, gas cylindersICS:Ta slovenski standard je istoveten z:EN 13293:2002SIST EN 13293:2003en01-december-2003SIST EN 13293:2003SLOVENSKI

STANDARD
SIST EN 13293:2003

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13293October 2002ICS 23.020.30English versionTransportable gas cylinders - Specification for the design andconstruction of refillable transportable seamless normalizedcarbon manganese steel gas cylinders of water capacity up to0,5 litre for compressed, liquefied and dissolved gases and up to1 litre for carbon dioxideBouteilles à gaz transportables - Spécifications pour laconception et la fabrication de bouteilles à gazrechargeables et transportables sans soudure en acier aucarbone manganèse normalisé, de capacité de l'eaujusqu'à 0,5 litre à gaz comprimés, liquéfiés et dissous etjusqu'à 1 litre au carbone ddioxideOrtsbewegliche Gasflaschen - Konstruktion und Aufbau vonwiederbefüllbaren ortsbeweglichen Gasflaschen ausnahtlosem normalgeglühtem Kohlenstoff-Mangan-Stahl miteinem Fassungsraum bis 0,5 Liter für verdichtete,verflüssigte und unter Druck gelöste Gase und bis 1 Literfür KohlendioxidThis European Standard was approved by CEN on 12 August 2002.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36

B-1050 Brussels© 2002 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13293:2002 ESIST EN 13293:2003

EN 13293:2002 (E)2ContentspageForeword......................................................................................................................................................................3Introduction.................................................................................................................................................................41Scope..............................................................................................................................................................52Normative references....................................................................................................................................53Terms, definitions and symbols...................................................................................................................54Materials and heat treatment........................................................................................................................75Design.............................................................................................................................................................96Construction and workmanship.................................................................................................................137New design tests..........................................................................................................................................148Batch tests....................................................................................................................................................189Tests on every cylinder...............................................................................................................................2210Failure to meet test requirements..............................................................................................................2211Records.........................................................................................................................................................2212Identification marks.....................................................................................................................................23Annex A (informative)

Description, evaluation of manufacturing defects and conditions for rejectionof seamless steel gas cylinders at time of visual inspection..................................................................24Annex B (informative)

Examples of design test and batch test certificates......................................................32Annex C (informative)

Guidance on the application of conformity assessment modules when usingthis standard.................................................................................................................................................38Bibliography..............................................................................................................................................................43SIST EN 13293:2003

EN 13293:2002 (E)3ForewordThis document EN 13293:2002 has been prepared by Technical Committee CEN/TC 23 "Transportable gascylinders", the secretariat of which is held by BSI.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by April 2003, and conflicting national standards shall be withdrawn at the latest byApril 2003.This document has been prepared under a mandate given to CEN by the European Commission and the EuropeanFree Trade Association.This European Standard has been submitted for reference into the RID and/or the technical annexes of the ADR.Therefore in this context the standards listed in the normative references and covering basic requirements of theRID/ADR not addressed within the present standard are normative only when the standards themselves arereferred to in the RID and/or the technical annexes of the ADR.For relationships with EC directives, RID and ADR see informative annex C, which is an integral part of thisdocument.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain,Sweden, Switzerland and the United Kingdom.SIST EN 13293:2003

EN 13293:2002 (E)4IntroductionThe purpose of this standard is to provide a specification for the design, manufacture and testing of refillable,transportable seamless steel gas cylinders.The specifications given are based on knowledge of, and experience with, materials, design requirements,manufacturing processes and control during manufacture, of cylinders in common use in the countries of the CENmembers.SIST EN 13293:2003

EN 13293:2002 (E)51 ScopeThis European Standard specifies minimum requirements for the material design, construction and workmanship,manufacturing processes and tests at manufacture of refillable seamless normalized gas cylinders made fromcarbon manganese steel of water capacities up to and including 0,5 litre for compressed, liquefiable and dissolvedgases and up to 1 litre for carbon dioxide.This standard is applicable to cylinders manufactured from normalized carbon manganese steel with an Rm value ofless than 850 MPa.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate place in the text, and the publications are listed hereafter. For datedreferences, subsequent amendments to or revisions of any of these publications apply to this European Standard onlywhen incorporated in it by amendment or revision. For undated references the latest edition of the publication referredto applies (including amendments).EN 1089-1:1996, Transportable gas cylinders - Gas cylinder identification (excluding LPG) - Part 1: Stampmarking.EN 10002-1, Metallic materials - Tensile testing - Part 1: Method of test at ambient temperature.EN 10028-1, Flat products made of steels for pressure purposes - Part 1: General requirements.EN ISO 11114-1:1997, Transportable gas cylinders - Compatibility of cylinder and valve materials with gas contents- Part 1: Metallic materials (ISO 11114-1:1997).EN ISO 13341:1997, Transportable gas cylinders — Fitting of valves to gas cylinders (ISO 13341:1997).3 Terms, definitions and symbolsFor the purposes of this European Standard, the following terms, definitions and symbols apply.3.1 Terms and definitions3.1.1yield stressvalue corresponding to the lower yield stress ReL or, for steels that do not exhibit defined yield, the 0,2 % proofstress Rp0,23.1.2normalizingheat treatment in which a cylinder is heated to a uniform temperature above the upper critical point (AC3, asdefined in EN 10052) of the steel and then cooled in still air3.1.3batchquantity of cylinders plus cylinders for destructive testing, defined in Table 3, of the same nominal diameter,thickness and design made from the same cast of steel and subjected to the same heat treatment for the sameduration of time. The length of the cylinder in a heat treatment batch may vary by up to 20 %3.1.4burst pressurehighest pressure reached in a cylinder during a burst testSIST EN 13293:2003

EN 13293:2002 (E)63.1.5design stress factor (F)variable ratio of equivalent wall stress at test pressure (ph) to guaranteed minimum yield stress (Re)3.1.6controlled hot formingcylinder end-forming operation carried out on normalized steel, above the austenitization temperature AC3, followedby cooling in still air, to produce a metallurgical condition equivalent to normalizing3.2 SymbolsaCalculated minimum thickness, in millimetres, of the cylindrical shell (see Figure 2)a¢Guaranteed minimum thickness, in millimetres, of the cylindrical shella1Guaranteed minimum thickness, in millimetres, of a concave base at the knuckle (see Figure 2)a2Guaranteed minimum thickness, in millimetres, of a concave base (see Figure 2)APercentage elongationbGuaranteed minimum thickness, in millimetres, at the centre of a convex base (see Figure 1)cDimension, in millimetres, of acceptable burst profile (see Figure 4)DOutside diameter of the cylinder, in millimetres (see Figure 1)FDesign stress factor, see 3.1.5hOutside height (concave base end), in millimetres (see Figure 2)HOutside height of domed part (convex head or base end) in millimetres (see Figure 1)LoOriginal gauge length, in millimetres, according to EN 10002-1 (see Figure 5)pbActual burst pressure, in bar1) , above atmospheric pressurephHydraulic test pressure, in bar1), above atmospheric pressureplcLower cyclic pressure, in bar1), above atmospheric pressure (see 7.3.2)pyObserved pressure when cylinder starts yielding during hydraulic bursting test, in bar1), above atmosphericpressurerInside knuckle radius, in millimetres (see Figures 1 and 2)ReMinimum guaranteed value of yield stress in megapascalsReaValue of the actual yield stress in megapascals determined by the tensile test (see 8.4.3)RgMinimum guaranteed value of tensile strength, in megapascalsRmActual value of tensile strength, in megapascals determined by the tensile test (see 8.4.3)SoOriginal cross-sectional area of tensile test piece, in square millimetres, according to EN 10002-1

1)1 bar = 105 Pa = 0,1 MPa.SIST EN 13293:2003

EN 13293:2002 (E)7tActual thickness of the test specimen in millimetres (see Figure 5)wWidth, in millimetres, of tensile test piece (see Figure 5)4 Materials and heat treatment4.1 General provisions4.1.1Materials for the manufacture of gas cylinders shall fall within one of the following categories:—internationally recognized cylinder steels;—nationally recognized cylinder steels.For all categories the requirements of 4.2 shall be satisfied.For all categories the relevant conditions specified in 5.3 shall be fulfilled.4.1.2The materials used for the fabrication of gas cylinders shall be killed steels.4.1.3The cylinder manufacturer shall establish means to identify the cylinders with the cast of steel from whichthey are made.4.1.4Steel used for cylinder manufacture shall be compatible with the intended gas service, e.g. corrosivegases, embrittling gases (see EN ISO 11114-1:1997).4.2 Chemical composition4.2.1The chemical composition of all steels shall be defined at least by:—maximum sulphur and phosphorus content;—carbon, manganese and silicon content;—chromium content where this element is intentionally added.Carbon, manganese, silicon and chromium contents shall be given with tolerances such that the differencesbetween the maximum and minimum values (maximum range) in the specified analysis do not exceed the values inTable 1.SIST EN 13293:2003

EN 13293:2002 (E)8Table 1 — Chemical composition tolerancesElementNominal contentMaximum permissible rangeCarbon< 0,30 %0,06 %³ 0,30 %0,07 %ManganeseAll values0,30 %SiliconAll values0,30 %Chromium< 0,25NOTEThe maximum permissible range for each element is not required to be centredon its nominal content. As an example, for a steel with nominal carbon content of 0,10 %,the following three maximum permissible ranges are equally acceptable:+ 0,00 %, -0,06 %+ 0,06 %, -0,0 %+ 0,03 %, -0,03 %4.2.2The following limits on sulphur and phosphorus shall not be exceeded in the cast analysis of material usedfor the fabrication of gas cylinders as shown in Table 2.Table 2 — Sulphur and phosphorus limitsElementContentSulphur0,020 %Phosphorus0,020 %Sulphur + phosphorus0,030 %4.2.3The cylinder manufacturer shall obtain and provide certificates of cast analyses of the steels supplied forthe manufacture of gas cylinders.Should check analyses be required, they shall be carried out either on specimens taken during manufacture frommaterial in the form as supplied by the steel maker to the cylinder manufacturer, or from finished cylinders avoidingdecarburized zones from the cylinder surface. In any check analysis, the maximum permissible deviation from thelimits specified for cast analyses shall conform to the values specified in EN 10028-1.NOTEEN 10028-1 is a general standard, which cross-refers the actual tables of permissible deviations given in the otherparts of EN 10028.4.3 Heat treatmentThe cylinder manufacturer shall ensure that the normalizing process has been correctly applied to the finishedcylinder. The normalizing process shall be consistent with achieving the required mechanical properties.SIST EN 13293:2003

EN 13293:2002 (E)9Cylinders made from normalized tube of low carbon manganese steels with carbon equivalent £ 0,3 % need not beheat treated after controlled hot forming provided that they were formed above AC3 temperature, cooled in still airand the manufacturing route including controlled hot forming has been agreed during design approval.Carbon equivalent shall be calculated from the formula:Carbon equivalent = ()()15Ni Cu 5V

Mo Cr 6Mn+C+++++where all quantities are expressed as % by weight.4.4 Test requirementsThe material properties of the finished cylinders shall satisfy the requirements of clauses 7, 8 and 9.4.5 Reheat treatment4.5.1Reheat treatment following a test failure is permitted only for those materials where finished properties aredeveloped by heat treatment. A maximum of two reheat treatments is permitted.4.5.2Whenever cylinders are reheat treated, the minimum design wall thickness (a' ) shall be maintained.5 Design5.1 General provisions5.1.1The calculation of the wall thickness of the pressure-containing parts shall be related to the yield stress(Re) of the material.5.1.2For calculation purposes, the value of the yield stress (Re) is limited to a maximum of 0,75 Rg.5.1.3The internal pressure upon which the calculation of wall thickness is based shall be the hydraulic testpressure (ph).5.1.4The compatibility of cylinder materials with gas contents is given by EN ISO 11114-1:1997.5.1.5The steel used for the manufacture of the gas cylinders shall have an Rm value of less than 850 MPa.5.2 Calculation of cylindrical wall thicknessThe guaranteed minimum wall thickness of the cylindrical shell (a') shall be not less than the thickness calculatedusing the equation:a = ïþïýüïîïíì×××--eheRF10pRFD31012where the value of F £ 0,77.Re/Rg shall not exceed 0,75.The calculated minimum wall thickness shall also satisfy the equation:SIST EN 13293:2003

EN 13293:2002 (E)10a ³ D2501mm+with an absolute minimum of a = 1,5 mmWhen choosing the minimum guaranteed value of thickness of the cylindrical shell (a'), the manufacturer shall takeinto account all requirements for design and batch testing, particularly the burst and yield pressure testrequirements of 7.3.The guaranteed minimum wall thickness (a¢) shall be equal to or greater than the calculated wall thickness (a).5.3 Calculation of convex ends (heads and base ends)5.3.1The shapes shown in Figure 1 are typical for convex heads and base ends. Shapes A and B are base endsformed from tubing, shapes D and E are base ends formed during the piercing of a billet and shapes C and F areheads.5.3.2When convex base ends are used, the following minimum values are recommended:r = 0,075×Db = 1,5 a for > H/D ³ 0,20b = a for H/D ³ 0,40In order to obtain a satisfactory stress distribution in the region where the end joins the cylindrical part, anythickening of the end that may be required, shall be gradual from the point of juncture. For the application of thisrule the point of juncture between the shell and the end is defined by the horizontal line indicating dimension H inFigure 1.Shape B shall not be excluded from this requirement. The cylinder manufacturer shall prove by the pressure cyclingtest as required in clause 7 that the design is satisfactory.SIST EN 13293:2003

EN 13293:2002 (E)11a'a'a'a'a'a'bbbbrrrrrrD2D2D2D2D2D2HHHHHHCDEFABC111111Key1Cylindrical partFigure 1 — Typical convex endsSIST EN 13293:2003

EN 13293:2002 (E)125.4 Calculation of concave base endsWhen concave base ends (see Figure 2) are used, the following minimum values are recommended:a1 = 2 a;a2 = 2 a;h = 0,12 D;r = 0,075 D.rha2a1aD2Figure 2 — Concave base endsIn order to obtain a satisfactory stress distribution the thickness of the cylinder shall increase progressively in thetransition area region between the cylindrical part and the base, and the wall shall be free from defects.The cylinder manufacturer shall prove by the pressure cycling test as required in clause 7 that the design issatisfactory.5.5 Neck design5.5.1 The external diameter and thickness of the formed neck end of the cylinder shall be designed for thetorque applied in fitting the valve to the cylinder. The torque may vary according to the diameter of thread, the formof thread and the sealant (if required) used in the fitting of the valve.NOTEFor recommended valving torques see EN ISO 13341:1997.5.5.2In establishing the minimum wall thickness consideration shall be given to obtaining a thickness of wall inthe cylinder neck which will prevent permanent expansion of the neck, during the initial and subsequent fittings ofthe valve onto the cylinder without support of an attachment.5.6 Foot-ringsWhen a foot-ring is provided, it shall be sufficiently strong and made of material compatible with that of thecylinders. The shape should preferably be cylindrical and shall give the cylinder sufficient stability. The foot-ringshall be secured to the cylinder by a method other than welding, brazing or soldering. Any gaps which can formwater traps shall be sealed by a method other than welding, brazing and soldering.SIST EN 13293:2003

EN 13293:2002 (E)135.7 Neck-ringsWhen a neck-ring is provided, it shall be sufficiently strong and made of material compatible with that of the cylinderand shall be securely attached by a method other than welding, brazing or soldering. The manufacturer shallensure that the axial load to remove the neck-ring is at least 1 000 N and that the torque to turn the neck-ring isgreater than 100 Nm.5.8 Manufacturing drawingA fully dimensioned drawing shall be prepared which includes the specification of the material, the manufacturingprocess and details of any permanent fittings.6 Construction and workmanship6.1 GeneralThe cylinder shall be produced by either:—forging or piercing from solid ingot or billet; or—by manufacturing from seamless tube; or—by pressing from a flat plate.Metal shall not be added in the process of closure of the end.6.2 Wall thicknessThe manufacturer shall ensure that sufficient evidence is available to demonstrate that the wall thickness at anypoint including stamp marked regions (see clause 12) shall be not less than the minimum thickness specified.6.3 Surface defectsThe internal and external surfaces of the finished cylinder shall be free from defects, which would adversely affectthe safe working of the cylinder.6.4 Mean diameterThe mean external diameter shall not deviate more than ± 2 % from the nominal design diameter.6.5 Out-of-roundnessThe out-of-roundness of the cylindrical shell, i.e. the difference between the maximum and minimum outsidediameter in the same cross-section shall not exceed 2 % of the mean for these diameters.6.6 Neck threadsThe internal neck threads shall conform to a recognized standard to permit the use of a corresponding valve thusminimizing neck stresses following the valve torquing operation. Internal neck threads shall be checked usinggauges corresponding to the neck thread, or by an alternative method.NOTEFor example, where the neck thread is specified to be in accordance with EN ISO 11116-1, the correspondinggauge is specified in EN ISO 11116-2.Particular care should be taken to ensure that neck threads are accurately cut, are of full form and free from anysharp profiles e.g. burrs.SIST EN 13293:2003

EN 13293:2002 (E)147 New design tests7.1 General requirements7.1.1Testing shall be carried out for each new design of cylinder.A design shall be considered to be a new design when any of the following conditions apply:—it is manufactured in a different factory; or—it is manufactured by a different process (this includes the case when major process changes are made duringthe production period e.g. end forging to spinning, change in type of heat treatment, or change in cold formingoperation); or—it is manufactured from a steel of different specified chemical composition limits from that used in the originaldesign test; or—it is given a different heat treatment; or—the base profile has changed, e.g. concave, convex, hemispherical, or if there is a change in the basethickness/cylinder diameter ratio; or—the overall length of the cylinder has increased by more than 50 % (cylinders with a length/diameter ratio lessthan 3 shall not be used as reference cylinders for any new design with this greater than 3); or—the nominal outside diameter has changed; or—there is a change in design wall thickness; or—the hydraulic test pressure has increased; or—the guaranteed minimum yield stress (Re) and/or the guaranteed minimum tensile strength (Rg) have changed.7.1.2A technical specification of each new design of cylinder, including design drawing, design calculations,steel details and heat treatment, shall be prepared by the manufacturer. A minimum of 50 finished cylinders whichshall be guaranteed by the manufacturer to be representative of the new design shall be made available for testing.However, if the total production is less than 50 cylinders, enough cylinders shall be made to complete the requiredtests, in addition to the production quantity, but in this case the test validity is limited to this particular batch.7.1.3The testing process shall include the following verifications and tests listed in 7.2.1 and 7.2.2 respectively.7.2 Verifications and tests7.2.1 VerificationsIt shall be verified that:—the design conforms to the requirements of clause 5;—the thickness of the walls and ends on two selected cylinders meets the requirements of 5.2 to 5.5, themeasurements being taken on at least three transverse sections of the cylindrical part and on a longitudinalsection of the base and head;—the requirements specified in clause 4 and 5.6 are met;—the geometrical requirements of 6.4 and 6.5 are complied with all cylinders selected for tests;—the internal and external surfaces of the cylinders are free of any defect which may make them unsafe for use(see annex A).SIST EN 13293:2003

EN 13293:2002 (E)157.2.2 List of testsThe following shall be performed:—the tests specified in 8.4 (mechanical tests) except that the tests shall be carried out on two cylinders;—the test specified in 7.3.1 (hydraulic burst test) on two cylinders;—the test specified in 7.3.2 (pressure cycling test) on two cylinders;—the test specified in 8.6, when applicable (following controlled hot forming) on two cylinders;—if the manufacturing process requires it, the test specified in 9.2 (leakage test) on two cylinders;—for cylinders with tapered internal threads, the test specified in 7.3.3 (neck strength test) on one cylinder;—for cylinders made from tube only, the test specified in 7.3.4 (base check) on the two cylinders used formechanical testing.7.3 Descriptions of tests7.3.1 Hydraulic burst test7.3.1.1 Test conditionsCylinders subjected to this test shall bear markings representative of those referenced in clause 12.7.3.1.2 Procedure(a) The hydraulic burst test shall be carried out using test equipment such as shown in Figure 3 which enablespressure to be increased at a controlled rate until the cylinder bursts, with provision for a curve of pressurevariation versus time, or versus volumetric expansion, to be produced. The test shall be carried out with thecylinder at a temperature of less than 40 °C.(b) It is important to ensure that any air present in the test cylinder or test equipment during setting up isexpelled before the test commences.(c) During the test, pressurization shall take place in two successive stages:In the first stage, the strain rate in the elastic range shall not exceed that in the tensile test up to a pressurecorresponding to the start of plastic deformation.In the second stage, the pump discharge rate shall be maintained at a level as constant as possible until thecylinder bursts.7.3.1.3 Interpretation of test resultsThe following procedures shall be used for the interpretation of the test results:—determination of the burst pressure (pb) and the yield pressure (py) attained during the test;—examination of the tear and the shape of its edge.SIST EN 13293:2003

EN 13293:2002 (E)161234567Key1Feed tank or other device for containing either water or another suitable hydraulic fluid2Tank for measurement of water or hydraulic fluid required for each test (the feed tank may be used as themeasuring tank)3High pressure pump4Pressure gauge5Device for plotting the pressure/time curve6Pipe-line with an air vent or release valve at the extreme top for connecting the fixed installation to the cylinderunder test. With certain installations it may be necessary to install more than one air vent to ensure that no air istrapped in the circuit7Safety device to prevent injury to personnel during the testFigure 3 — Typical hydraulic burst test installationSIST EN 13293:2003

EN 13293:2002 (E)177.3.1.4 Acceptance criteria7.3.1.4.1 For the results of a burst test to be considered satisfactory, the following requirements shall be met: —the actual burst pressure (pb) shall be equal to or greater than 2,0 times the test pressure ph.; —the cylinder shall remain in one piece and shall not fragment; —the main fracture of the cylindrical portion shall not be brittle, i.e. the fracture edges shall be inclined withrespect to the wall; —the tear shall not reveal a significant defect in the metal; —the tear shall not run into the centre neck or centre base of the cylinder. Figure 4 illustrates the satisfactory result of a burst test.7.3.1.4.2 If the configuration of the fracture does not conform to Figure 4 the cylinder shall be submitted to afurther examination to enable a decision to be reached on acceptability. < p D3

p3DccFigure 4 — Acceptable burst profile in all cases7.3.2 Pressure cycling testCylinders subjected to this test shall bear markings representative of those referenced in clause 12. This test shallbe carried out with a non-corrosive liquid subjecting the cylinders to successive reversals at an upper cyclicpressure which is equal to the hydraulic test pressure (ph). The cylinder shall withstand 12 000 cycles withoutfailure.For cylinder

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