SIST EN 1964-2:2002

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.SRQRYQROrtsbewegliche Gasflachen - Gestaltung und Konstruktion von nahtlosen wiederbefüllbaren ortsbeweglichen Gasflaschen aus Stahl mit einem Fassungsraum von 0,5 Liter bis einschließlich 150 Liter - Teil 2: Nahtlose Flaschen aus Stahl mit einem Rm-Wert von 1100 MPa und darüberBouteilles a gaz transportables - Spécifications pour la conception et la fabrication de bouteilles a gaz rechargeables et transportables, en acier sans soudure, de capacité en eau comprise entre 0,5 litre et 150 litres inclus - Partie 2: bouteilles en acier sans soudure d'une valeur Rm égale ou supérieure a 1100 MPaTransportable gas cylinders - Specification for the design and construction of refillable transportable seamless steel gas cylinders of water capacities from 0,5 litre up to and including 150 litres - Part 2: Cylinders made of seamless steel with an Rm value of 1100 MPa and above23.020.30MHNOHQNHPressure vessels, gas cylindersICS:Ta slovenski standard je istoveten z:EN 1964-2:2001SIST EN 1964-2:2002en01-maj-2002SIST EN 1964-2:2002SLOVENSKI
STANDARD



SIST EN 1964-2:2002



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1964-2September 2001ICS 23.020.30English versionTransportable gas cylinders - Specification for the design andconstruction of refillable transportable seamless steel gascylinders of water capacities from 0,5 litre up to and including150 litres - Part 2: Cylinders made of seamless steel with an Rmvalue of 1100 MPa and aboveBouteilles à gaz transportables - Spécifications pour laconception et la fabrication de bouteilles à gazrechargeables et transportables, en acier sans soudure, decapacité en eau comprise entre 0,5 litre et 150 litres inclus- Partie 2: bouteilles en acier sans soudure d'une valeur Rmégale ou supérieure à 1100 MPaOrtsbewegliche Gasflachen - Gestaltung und Konstruktionvon nahtlosen wiederbefüllbaren ortsbeweglichenGasflaschen aus Stahl mit einem Fassungsraum von 0,5Liter bis einschließlich 150 Liter - Teil 2: Nahtlose Flaschenaus Stahl mit einem Rm-Wert von 1100 MPa und darüberThis European Standard was approved by CEN on 11 August 2001.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, 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© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1964-2:2001 ESIST EN 1964-2:2002



EN 1964-2:2001 (E)2ContentspageForeword.3Introduction.41Scope.52Normative References.53Terms, definitions and symbols.64Materials and heat treatment.85Design.106Construction and workmanship.147Tests.158Conformity evaluation criteria.319Stamp marking.31Annex A (normative)
Prototype testing and production testing.32Annex B (normative)
Description, evaluation of manufacturing defects and conditions for rejection ofseamless steel gas cylinders at time of visual inspection.36Annex C (normative)
Ultrasonic inspection.46Annex D (informative)
Examples of type approval and production test certificates.52Bibliography.57SIST EN 1964-2:2002



EN 1964-2:2001 (E)3ForewordThis European Standard has been prepared by Technical Committee CEN/TC 23 "Transportable gas cylinders",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 March 2002, and conflicting national standards shall be withdrawn at the latest byMarch 2002.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 in the technical annexes of the ADR.This standard is one of a series of three standards concerning refillable seamless steel gas cylinders of watercapacities from 0,5 litre up to and including 150 litres for compressed, liquefied and dissolved gases:Part 1:Cylinders made of seamless steel with an Rm value of less than 1 100 MPaPart 2: Cylinders made of seamless steel with an Rm value of 1 100 MPa and abovePart 3:Cylinders made of seamless stainless steel with an Rm value of less than 1 100 MpaThe annexes A, B and C are normative. Annex D is informative.This standard includes a Bibliography.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, Netherlands, Norway, Portugal, Spain, Sweden,Switzerland and the United Kingdom.SIST EN 1964-2:2002



EN 1964-2:2001 (E)4IntroductionThe purpose of this standard is to provide a specification for the design, manufacture, inspection and approval ofrefillable, 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 1964-2:2002



EN 1964-2:2001 (E)51 ScopeThis European Standard sets out minimum requirements for the material, design, construction and workmanship,manufacturing processes and tests at manufacture of refillable transportable seamless steel gas cylinders of watercapacities from 0,5 litres up to and including 150 litres for compressed, liquefied and dissolved gases.This standard is applicable to cylinders with a value of Rm max.
1 100 MPa. It does not cover cylinders withdiameters > 140 mm where either Rm max. > 1 300 MPa or the design wall thickness
12 mm. It also does notcover cylinders with diameters
140 mm where either Rm max
1 400 MPa or the design wall thickness
6 mm,because beyond these limits additional requirements could possibly apply.NOTE 1For compatibility with the intended gas service and operational conditions, of grades and strength ranges of steelsused for cylinder manufacture, see 4.1.4.NOTE 2This standard is also suitable for the manufacture of cylinders of water capacity less than 0,5 litre.2 Normative ReferencesThis European Standard incorporates, by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listed hereafter.
Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).EN 473, Non destructive testing - Qualification and certification of NDT personnel — General principlesEN 10028-1,
Flat products made of steels for pressure purposes — Part 1: General requirementsEN 1089-1: 1996, Transportable gas cylinders — Gas cylinder identification (excluding LPG) — Part 1:StampmarkingEN 10002-1, Metallic materials — Tensile testing — Part 1: Method of test (at ambient temperature)EN ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method (ISO 6506-1:1999)EN 10045-1, Metallic materials — Charpy impact test — Part 1: Test methodEN 10052, Vocabulary of heat treatment terms for ferrous productsEN ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method (scales A, B, C, D, E, F, G, H,K, N, T) (ISO 6508-1:1999)EN ISO 11114-1:1997, Transportable gas cylinder - Compatibility of cylinder and valve materials with gas contents— Part 1: Metallic materials (ISO 11114-1:1997)EURONORM 6-55, Bend test for steelSIST EN 1964-2:2002



EN 1964-2:2001 (E)63 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 Rp0,23.1.2quenchinghardening heat treatment in which a cylinder, which has been heated to a uniform temperature above the uppercritical point (Ac3, as defined in EN 10052) of the steel, is cooled rapidly in a suitable medium3.1.3temperingsoftening heat treatment which follows quenching, in which the cylinder is heated to a uniform temperature belowthe critical point (Ac1, as defined in EN 10052) of the steel3.1.4batcha quantity of up to 200 cylinders, plus cylinders for destructive testing, of the same nominal diameter, thickness,length and design made from the same steel and subjected to the same heat treatment for the same duration oftime3.1.5burst pressurehighest pressure reached in a cylinder during a burst test3.1.6test pressurerequired pressure applied during a pressure test3.1.7design stress factor (F)the ratio of equivalent wall stress at test pressure (ph) to guaranteed minimum yield stress (Re)3.1.8competent bodyorganization responsible for checking the conformity of cylinders to this standardNOTEWithin the framework of the application of the regulations pertaining to the transport of dangerous goods, thisorganization may be, depending on the selected conformity assessment module, either a notified body or an approved body, oran entity within the manufacturer’s organization.3.2 SymbolsaCalculated minimum thickness, in millimetres, of the cylindrical shellaGuaranteed minimum thickness, in millimetres, of the cylindrical shell (see Figure 1)SIST EN 1964-2:2002



EN 1964-2:2001 (E)7a1Required minimum thickness, in millimetres, of a concave base at the knuckle (see Figure 2)a2Required minimum thickness, in millimetres, at the centre of a concave base (see Figure 2)APercentage elongationbRequired minimum thickness, in millimetres, at the centre of a convex base (see Figure 1)dDimension, in millimetres, of acceptable burst profile (see Figures 10 and 11)DOutside diameter of the cylinder, in millimetres (see Figure 1)DfDiameter of former, in millimetres (see Figure 6)FDesign stress factor (see 3.1.7)hOutside height (concave base end), in millimetres (see Figure 2)HOutside height of domed part (convex head or base end), in millimetres (see Figure 1)losurface length of artificial flaw, in millimetres (see 7.7.2 and 7.8.2)LNominal cylinder length, in millimetres (see Figure 3)LoOriginal gauge length, in millimetres, according to EN 10 002-1 (see Figure 4)pbMeasured burst pressure, in bar1), above atmospheric pressure in the hydraulic burst testpfMeasured failure pressure, in bar1), above atmospheric pressure in the flawed cylinder burst testphHydraulic test pressure, in bar1), above atmospheric pressurepsDesign working pressure, in bar1), above atmospheric pressure (calculated as equal to 2/3 ph)pwWorking pressure, in bar1), above atmospheric pressurepyObserved yield pressure, in bar1) , above atmospheric pressurerInside knuckle radius, in millimetres (Figure 1 and 2)rcFlaw root radius, in millimetres (see 7.7.2 and 7.8.2)ReMinimum guaranteed value of yield stress (see 3.1.1), in megapascalsReaValue of the actual yield stress, in megapascals, determined by the tensile test (see 7.1.2.1)RgMinimum guaranteed value of tensile strength, in megapascalsRmActual value of tensile strength, in megapascals determined by the tensile test (see 7.1.2.1)Rm max.Maximum actual value of the tensile strength, in megapascalsRm min.Minimum actual value of the tensile strength, in megapascalsSoOriginal cross-sectional area of tensile test piece, in square millimetres, according to EN 10 002-1
1) 1 bar = 105 Pa = 0,1 MPaSIST EN 1964-2:2002



EN 1964-2:2001 (E)8tActual thickness of the test specimen, in millimetres (see Figure 6)VWater capacity of cylinder, in litreswWidth, in millimetres, of tensile test piece (see Figure 5)Depth of artificial flaw, in millimetres (see 7.7.2 and 7.8.2)cRunout radius of flaw, in millimetres (see 7.7.2 and 7.8.2)4 Materials and heat treatment4.1 General provisions4.1.1 Steels for the manufacture of gas cylinders shall meet the requirements of this standard.4.1.2The steel used for the fabrication of gas cylinders shall have acceptable non-ageing properties and shallnot be rimming quality.
In cases where examination of this non-ageing property is required, the criteria by which itis to be specified shall be agreed between the parties.4.1.3The cylinder manufacturer shall establish means to identify the cylinders with the cast of steel from whichthey are made.4.1.4High strength steels in this standard are not normally compatible with corrosive or embrittling gases. (SeeEN ISO 11114-1: 1997).
They may however be used with such gases provided that their compatibility is proven bya recognized method.4.2 Controls on chemical composition4.2.1The chemical composition of all steels shall be specified and recorded, including: maximum sulphur and phosphorus content; carbon, manganese and silicon content; nickel, chromium, molybdenum and all other alloying elements intentionally added.The content of carbon, manganese, silicon and where appropriate, nickel, chromium and molybdenum shall begiven, with tolerances, such that the differences between the maximum and minimum values (maximum range) ofthe cast do not exceed the values shown in Table 1.SIST EN 1964-2:2002



EN 1964-2:2001 (E)9Table 1 — Chemical composition tolerancesElementMaximum content in %Maximum permissible range in %Carbon< 0,30 %0,03 % 0,30 %0,04 %ManganeseAll values0,20 %SiliconAll values0,15 %Chromium< 1,20 %0,2 % 1,20 %0,3 %NickelAll values0,30 %Molybdenum< 0,50 %0,10 % 0,50 %0,15 %NOTE
The maximum permissible range for each element is not required to be centred on its nominalcontent. As an example, for a steel with nominal carbon content of 0,10 %, the following threemaximum permissible ranges are equally acceptable:+ 0,00 %, - 0,03 %+ 0,03 %, - 0,00 %+ 0,01 %, - 0,02 %The combined content of the following elements: V, Nb, Ti, B, Zr, shall not exceed 0,15 %.The actual content of all deliberately added elements shall conform to the above specification and be reported.4.2.2Sulphur and phosphorus in the cast analysis of material used for the manufacture of gas cylinders shall notexceed the values shown in Table 2.Table 2 — Sulphur and phosphorus limitsElementContentSulphur0,010 %Phosphorus0,015 %Sulphur + phosphorus0,020 %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. In anycheck analysis, the maximum permissible deviation from the limits specified for cast analyses shall conform to thevalues specified in EN 10028-1.NOTEEN 10028-1 is a general standard which cross references the actual permissible deviations given in other parts ofEN 10028.SIST EN 1964-2:2002



EN 1964-2:2001 (E)104.3 Heat treatment4.3.1The cylinder manufacturer shall provide a certificate stating the heat treatment process applied to thefinished cylinders.4.3.2Quenching in media other than mineral oil is permissible provided that the method produces cylinders freeof cracks. If the rate of cooling in the medium is greater than 80 % of that in water at 20 C without additives, everyproduction cylinder shall be subjected to a non-destructive test to prove freedom from cracks. (See 6.4.)4.3.3The tempering process shall achieve the required mechanical properties. The actual temperature to whicha type of steel is subjected for a given tensile strength shall not deviate by more than 30 C from the temperaturespecified by the cylinder manufacturer for the cylinder type.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.5.1.2Cylinders may be designed with one or two openings along the central cylinder axis only.5.1.3For calculation purposes, the value of the yield stress (Re) is limited to a maximum of 0,90 Rg.5.1.4The internal pressure upon which the calculation of wall thickness is based shall be the hydraulic testpressure (ph).5.2 Limiting design stressThe maximum of the tensile strength is limited by the ability of the steel to pass the requirements of A.1 (prototypetests) and A.2 (batch tests). The maximum range of tensile strength shall be 120 MPa (i.e. Rm max. – Rm min.
120 MPa).However, the actual value of the tensile strength as determined in 7.1.2.1 shall not exceed 1 300 MPa for cylinderswith outside diameter > 140 mm, and 1 400 MPa for cylinders with outside diameter
140 mm.SIST EN 1964-2:2002



EN 1964-2:2001 (E)115.3 Calculation of cylindrical wall thicknessThe guaranteed minimum thickness of the cylindrical shell (a') shall be not less than the thickness calculated usingequations (1) and (2), and in addition condition (3) shall be satisfied:ee.10.3.10.12RFRFDahp(1)Where the value of F is the lesser of )/(65,0geRR or 0,77Re/Rg shall not exceed 0,90.The wall thickness shall also satisfy the formulamm 1250 aD(2)with an absolute minimum of a = 1,5 mm.The burst ratiopb/ph
1,6(3)shall be satisfied by test.NOTEIf the result of these requirements is a guaranteed thickness of the cylindrical shell (a')
12 mm for diameter D >140 mm, or a guaranteed thickness of the cylindrical shell (a')
6 mm for diameter D
140 mm, then such a design would beoutside the scope of this standard.5.4 Calculation of convex ends (heads and base ends)5.4.1The shapes shown in Figure 1 are typical of convex heads and base ends. Shape A is a base end formedfrom tubing and from plates, shapes C and D are base ends formed during the piercing of a billet, and shape B is ahead.5.4.2When convex base ends are used, the following minimum values are recommended:r = 0,075·Db = 1,5a for 0,40 > H/D
0,20b = a for H/D
0,40In order to obtain a satisfactory stress distribution in the region where the end joins the shell, any thickening of theend that may be required shall be gradual from the point of juncture. For the application of this rule, the point ofjuncture between the shell and the end is defined by the horizontal line indicating dimension H in Figure 1.Shape B shall not be excluded from this requirement.The cylinder manufacturer shall prove by the pressure cycling prototype test as required in A.1 that the design issatisfactory.SIST EN 1964-2:2002



EN 1964-2:2001 (E)12Key1Cylindrical partFigure 1 — Typical convex endsSIST EN 1964-2:2002



EN 1964-2:2001 (E)135.5 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.Figure 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 prototype test as required in A.1 that the design issatisfactory.5.6 Neck design5.6.1The external diameter and thickness of the formed neck end of the cylinder shall be adequate 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 used in the fitting of the valve.NOTEFor recommended valving torques see EN ISO 13341.5.6.2The thickness of the wall in the cylinder neck shall be sufficient to prevent permanent expansion of theneck during initial and subsequent fitting of the valve into the cylinder. Where the cylinder is specifically designed toSIST EN 1964-2:2002



EN 1964-2:2001 (E)14be fitted with neck reinforcement, such as a neck ring or shrunk-on collar, this may be taken into account (seeEN ISO 13341).5.7 Foot-ringsAs agreed between the parties, a foot-ring, if provided, shall be sufficiently strong and made of material compatiblewith that of the cylinder. In addition, the shape should preferably be cylindrical and shall give the cylinder sufficientstability. The foot-ring shall be secured to the cylinder by a method other than welding, brazing or soldering. Anygaps which may form water traps shall be sealed to prevent ingress of water by a method other than welding,brazing or soldering.5.8 Neck-ringsAs agreed between the parties, a neck ring, if provided, shall be sufficiently strong and made of material compatiblewith that of the cylinder, and shall be securely attached by a method other than welding, brazing or soldering.The manufacturer shall ensure that the axial load to remove the neck-ring is greater than 10 times the weight of theempty cylinder and not less than 1 000 N, also that the minimum torque to turn the neck-ring is greater than100 Nm.5.9 Design drawingA fully dimensioned drawing shall be prepared which includes the specification of the material, and details of thepermanent fittings.6 Construction and workmanship6.1 GeneralThe cylinder shall be produced by:a) forging or drop forging from a solid ingot or billet; orb) manufacturing from seamless tube; orc) pressing from a flat plate.Metal shall not be added in the process of closure of the end. Manufacturing defects shall not be corrected byplugging of bases.6.2 Wall thicknessEach cylinder shall be examined for thickness. The wall thickness at any point shall be not less than the minimumthickness 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. See annex B6.4 Ultrasonic examinationExcept as identified in C.6, all cylinders shall be ultrasonically examined for defects in accordance with annex C.(This method does not necessarily meet the requirements of 4.3.2.)SIST EN 1964-2:2002



EN 1964-2:2001 (E)156.5 Neck threadsThe internal neck threads shall conform to a recognized standard agreed between the parties to permit the use of acorresponding valve thus minimizing neck stresses following the valve torquing operation. Internal neck threadsshall be checked using gauges corresponding to the agreed neck thread, or by an alternative method agreedbetween the parties.NOTEFor example, where the neck thread is specified to be in accordance with EN 629-1, the corresponding gauges arespecified in EN 629-2.Particular care shall be taken to ensure that neck threads are accurately cut, are of full form and free from anysharp profiles e.g burrs.6.6 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 of these diameters.6.7 Mean diameterThe mean external diameter of the cylindrical part outside the transition zones on a cross section shall not deviatemore than
1 % from the nominal design diameter.6.8 StraightnessThe maximum deviation of the cylindrical part of the shell from a straight line shall not exceed 3 mm per metrelength (See Figure 3).6.9 StabilityFor a cylinder designed to stand on its base, the variation from vertical shall be less than 1 % of its height, and theouter diameter of the surface in contact with the ground shall be greater than 75 % of the nominal outside diameter(see Figure 3).7 TestsNOTEFor details of numbers of cylinders to be submitted to test see annex A.7.1 Mechanical tests7.1.1 General requirementsExcept for the requirements set out below, the mechanical tests shall be carried out in accordance with EN 10002-1, EN ISO 6506-1, EN 10045-1 and EURONORM 6-55.All mechanical tests for checking the material properties of gas cylinders shall be carried out on test pieces takenfrom cylinders on which all operations affecting mechanical properties have been completed. Such cylinders neednot have been pressure tested.For location of test pieces, see Figure 4.SIST EN 1964-2:2002



EN 1964-2:2001 (E)16Key1Maximum 0,01 L (see 6.9)2Maximum 0,003 L (see 6.8)Figure 3 — Measurement of straightness and verticalitySIST EN 1964-2:2002



EN 1964-2:2001 (E)17Key1Tensile test piece for hardness/tensile correlation (see 7.5.1)2Bend test pieces or flattening ring3Impact test pieces4Tensile test pieceFigure 4 — Location of test piecesSIST EN 1964-2:2002



EN 1964-2:2001 (E)187.1.2 Test procedures7.1.2.1 Tensile test7.1.2.1.1A tensile test shall be carried out on material taken from the cylindrical part of the cylinder by usingeither rectangular specimens or machined round specimens.7.1.2.1.2For rectangular specimens, the tensile test shall be carried out according to EN 10002-1 on a testpiece shaped in accordance with Figure 5 and with a gauge length Lo = 5,65
So.The two faces of the test piece representing the inside and outside surfaces of the cylinder shall not be machined.For machined round specimens, the diameter shall be the maximum practicable, with gauge length 5 times gaugediameter. It is recommended that machined round specimens are not used for wall thickness less than 3 mm.Dimensions in millimetresw
4tw
D/8Figure 5 — Rectangular tensile test piece7.1.2.1.3The minimum elongation values shall be 12 % for rectangular specimens, and 14 % for roundspecimens.NOTEAttention is drawn to the method of measurement of elongation described in EN 10002-1, particularly in caseswhere the tensile test piece is tapered, resulting in a point of fracture away from the middle of the gauge length.SIST EN 1964-2:2002



EN 1964-2:2001 (E)197.1.2.1.4Yield and tensile properties guaranteed by the manufacturer shall be achieved in the test.7.1.2.2 Bend test7.1.2.2.1The bend test shall be carried out in accordance with EURONORM 6-55 on two test pieces obtainedby cutting a ring of width 25 mm or 4 t, whichever is the greater, into equal parts, from the cylindrical part of thecylinder. Each test piece shall be of sufficient length to permit the bend test to be carried out correctly. Only theedges of the test pieces may be machined.7.1.2.2.2The bend test shall be carried out using a former of diameter Df, and two rollers separated by adistance Df + 2t, as shown in Figure 6. The diameter Df of the former shall be 8 times the actual thickness t of thetest piece.7.1.2.2.3The test piece shall not crack when bent inwards around the former until the inside edges are notfurther apart than the diameter of the former (see Figure 6).Figure 6 — Illustration of bend test7.1.2.3 Flattening test7.1.2.3.1The flattening test shall be carried out on one ring of width 25 mm or 4t, whichever is the greater, takenfrom the cylindrical part of the cylinder. Only the edges of the ring may be machined. The ring shall be flattenedbetween platens until the distance between the platens is 10 times the average ring thickness t. The flattened ringshall remain uncracked.SIST EN 1964-2:2002



EN 1964-2:2001 (E)207.1.2.4 Impact test7.1.2.4.1Except for the requirements set out below the impact te
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