SIST EN 12245:2009
(Main)Transportable gas cylinders - Fully wrapped composite cylinders
Transportable gas cylinders - Fully wrapped composite cylinders
This European Standard specifies minimum requirements for the materials, design, construction, prototype testing and routine manufacturing inspections of composite gas cylinders for compressed, liquefied and dissolved gases.
NOTE 1 For the purposes of this standard, the word “cylinder” includes tubes.
This standard is applicable to cylinders that comprise a liner of metallic material (welded or seamless) or non-metallic material (or a mixture thereof), reinforced by a wound composite consisting of fibres of glass, carbon or aramid (or a mixture thereof) embedded in a matrix.
This standard is also applicable to composite cylinders without liners.
This standard is not applicable to gas cylinders which are partially covered with fibres and commonly called "hoop wrapped" cylinders. For hoop wrapped composite cylinders see EN 12257.
NOTE 2 The specification does not address the design, fitting and performance of removable protective sleeves. Where these are fitted they should be considered separately.
Ortsbewegliche Gasflaschen - Vollumwickelte Flaschen aus Verbundwerkstoffen
Diese Europäische Norm legt Mindestanforderungen an Werkstoffe, Gestaltung und Konstruktion, Prototyp¬prüfungen und routinemäßige Inspektionen während der Herstellung von Gasflaschen aus Verbundwerk¬stoffen für verdichtete, verflüssigte und gelöste Gase fest.
ANMERKUNG 1 Für die Anwendung dieser Norm umfasst das Wort Flasche auch Großflaschen.
Diese Norm ist auf Flaschen anwendbar, die einen Liner aus metallischem Werkstoff (geschweißt oder nahtlos) oder nichtmetallischem Werkstoff (oder einer Kombination daraus) umfassen, der mit einem in einer Matrix eingebetteten Wickelverbund aus Glas , Kohlenstoff oder Aramidfasern (oder einer Kombination daraus) verstärkt ist.
Diese Norm gilt auch für Flaschen aus Verbundwerkstoffen ohne Liner.
Die vorliegende Norm gilt nicht für Gasflaschen, die teilweise mit Fasern eingehüllt sind und allgemein als umfangsgewickelte Flaschen bezeichnet werden. Zu umfangsgewickelten Flaschen aus Verbundwerkstoffen siehe EN 12257.
ANMERKUNG 2 Die Spezifikation behandelt nicht die Konstruktion, Anbringung und Leistung von abnehmbaren Schutzhülsen. Sind derartige Schutzhüllen angebracht, sollten sie separat betrachtet werden.
Bouteilles a gaz transportables - Bouteilles entierement bobinées en matériaux composites
La présente Norme européenne spécifie les exigences minimales relatives aux matériaux, a la conception, a la construction, aux essais de qualification de modele et aux contrôles courants de production, des bouteilles a gaz en matériaux composites pour gaz comprimés, liquéfiés et dissous.
NOTE 1 Pour les besoins de la présente norme, le mot « bouteille » englobe les tubes.
La présente norme s'applique aux bouteilles constituées d'un liner métallique (avec ou sans soudure), ou non métallique (ou constitué d'un mélange de ces matériaux), renforcé par un enroulement composite en fibres de verre, de carbone ou d'aramide (ou un mélange de ces matériaux) noyées dans une matrice.
La présente norme s'applique également aux bouteilles a gaz en composite sans liner.
La présente norme ne s'applique pas aux bouteilles a gaz partiellement recouvertes de fibres et couramment appelées « bouteilles frettées ». Pour les bouteilles frettées en matériaux composites, voir l’EN 12257.
NOTE 2 Cette spécification ne traite pas de la conception, du montage et des performances des gaines de protection amovibles. Lorsque celles-ci sont montées, il convient de les considérer séparément.
Premične plinske jeklenke - Popolnoma obvite jeklenke iz kompozitnih mas
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Ortsbewegliche Gasflaschen - Vollumwickelte Flaschen aus VerbundwerkstoffenBouteilles a gaz transportables - Bouteilles entierement bobinées en matériaux compositesTransportable gas cylinders - Fully wrapped composite cylinders23.020.30MHNOHQNHPressure vessels, gas cylindersICS:Ta slovenski standard je istoveten z:EN 12245:2009SIST EN 12245:2009en,fr,de01-april-2009SIST EN 12245:2009SLOVENSKI
STANDARDSIST EN 12245:20021DGRPHãþD
SIST EN 12245:2009
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12245January 2009ICS 23.020.30Supersedes EN 12245:2002
English VersionTransportable gas cylinders - Fully wrapped composite cylindersBouteilles à gaz transportables - Bouteilles entièrementbobinées en matériaux compositesOrtsbewegliche Gasflaschen - Vollumwickelte Flaschenaus VerbundwerkstoffenThis European Standard was approved by CEN on 29 November 2008.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 CEN 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 CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12245:2009: ESIST EN 12245:2009
EN 12245:2009 (E) 2 Contents Page Foreword . 31Scope. 52Normative references . 53Terms, definitions and symbols . 73.1Terms and definitions . 73.2Symbols . 94Design and manufacture . 94.1General . 94.2Liner. 104.3Composite overwrap . 114.4Finished cylinder . 125Cylinder and material tests . 135.1General . 135.2Requirements and test methods . 145.3Failure to meet test requirements . 316Conformity evaluation . 317Marking . 328Operating instructions (cylinders with non-metallic liners) . 33Annex A (normative)
Prototype, design variant and production testing . 34A.1General . 34A.2Prototype testing . 34A.3Design variant testing. 37A.4Production testing . 42Annex B (informative)
Examples of prototype approval and production testing certificates . 45B.1Type approval certificate – composite cylinders with metallic liners . 45B.2Type approval certificate – composite cylinders with non-metallic liners . 46B.3Type approval certificate – composite cylinders without liners . 47B.4Design variant approval certificate – composite cylinders with metallic liners . 48B.5Production test certificate . 49Bibliography . 51 SIST EN 12245:2009
EN 12245:2009 (E) 3 Foreword This document (EN 12245:2009) 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 or by endorsement, at the latest by July 2009, and conflicting national standards shall be withdrawn at the latest by July 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 12245:2002. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EC Directive(s). According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. SIST EN 12245:2009
EN 12245:2009 (E) 4 Introduction The purpose of this European Standard is to provide a specification for the design, manufacture, inspection and testing of refillable, transportable fully wrapped composite 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 CEN members.
SIST EN 12245:2009
EN 12245:2009 (E) 5
1 Scope This European Standard specifies minimum requirements for the materials, design, construction, prototype testing and routine manufacturing inspections of composite gas cylinders for compressed, liquefied and dissolved gases. NOTE 1 For the purposes of this European Standard, the word “cylinder” includes tubes (seamless transportable pressure receptacles of a water capacity exceeding 150 litres and of not more than 3 000 litres). This European Standard is applicable to cylinders that comprise a liner of metallic material (welded or seamless) or non-metallic material (or a mixture thereof), reinforced by a wound composite consisting of fibres of glass, carbon or aramid (or a mixture thereof) embedded in a matrix. This European Standard is also applicable to composite cylinders without liners. This European Standard is not applicable to gas cylinders which are partially covered with fibres and commonly called "hoop wrapped" cylinders. For hoop wrapped composite cylinders, see EN 12257. NOTE 2 This European Standard does not address the design, fitting and performance of removable protective sleeves. Where these are fitted, they should be considered separately. This European Standard is primarily for industrial gases other than LPG but may also be applied to LPG. NOTE 3 For dedicated LPG cylinders, see EN 14427.
2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 720-2, Transportable gas cylinders — Gases and gas mixtures — Part 2: Determination of flammability and oxidizing potential of gases and gas mixtures EN 1964-1, Transportable 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 1: Cylinders made of seamless steel with an Rm value of less than 1100 MPa EN 1964-2, Transportable 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 above EN 1964-3, Transportable 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 3:. Cylinders made of seamless stainless steel with an Rm value of less than 1100 MPa EN 1975, Transportable gas cylinders — Specification for the design and construction of refillable transportable seamless aluminium and aluminium alloy gas cylinders of capacity from 0,5 litre up to 150 litres EN 12862, Transportable gas cylinders — Specification for the design and construction of refillable transportable welded aluminium alloy gas cylinders SIST EN 12245:2009
EN 12245:2009 (E) 6 EN 13322-1, Transportable gas cylinders — Refillable welded steel gas cylinders — Design and construction - Part 1: Carbon steel EN 13322-2, Transportable gas cylinders — Refillable welded steel gas cylinders — Design and construction - Part 2: Stainless steel EN 14638-1, Transportable gas cylinders - Refillable welded receptacles of a capacity not exceeding 150 litres - Part 1: Welded austenitic stainless steel cylinders made to a design justified by experimental methods EN ISO 11114-1, Transportable gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 1: Metallic materials (ISO 11114-1:1997) EN ISO 11114-2, Transportable gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 2: Non-metallic materials (ISO 11114-2:2000) EN ISO 11114-3, Transportable gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 3: Autogenous ignition test in oxygen atmosphere (ISO 11114-3:1997) EN ISO 11114-4, Transportable gas cylinders – Compatibility of cylinder and valve materials with gas contents – Part 4: Test methods for selecting metallic materials resistant to hydrogen embrittlement (ISO 11114-4:2005) EN ISO 11120, Gas cylinders — Refillable seamless steel tubes for compressed gas transport, of water capacity between 150 l and 3000 l — Design, construction and testing (ISO 11120:1999) EN ISO 13341, Transportable gas cylinders — Fitting of valves to gas cylinders (ISO 13341:1997) EN ISO 13769, Gas Cylinders – Stamp marking (ISO 13769:2002) ISO 75-1, Plastics — Determination of temperature of deflection under load — Part 1: General test method ISO 75-3, Plastics — Determination of temperature of deflection under load — Part 3: High-strength thermosetting laminates and long-fibre-reinforced plastics ISO 175, Plastics — Methods of test for the determination of the effects of liquid chemicals ISO 527-1, Plastics — Determination of tensile properties — Part 1: General principles ISO 527-2, Plastics — Determination of tensile properties — Part 2: Test conditions for moulding and extrusion plastics ISO 1133, Plastics — Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate (MVR) of thermoplastics ISO 1183 (all parts), Plastics — Methods of determining the density and relative density of non-cellular plastics ISO 1628-3, Plastics — Determination of the viscosity of polymers in dilute solution using capillary viscometers — Part 3: Polyethylenes and polypropylenes ISO 2884-1, Paints and varnishes — Determination of viscosity using rotary viscometers — Part 1: Cone-and-plate viscometer operated at a high rate of shear ISO 3146, Plastics — Determination of melting behaviour (melting temperature or melting range) of semi-crystalline polymers by capillary tube and polarizing-microscope methods SIST EN 12245:2009
EN 12245:2009 (E) 7 ISO 3341, Textile glass -- Yarns -- Determination of breaking force and breaking elongation ISO 8521, Plastics piping systems -- Glass-reinforced thermosetting plastics (GRP) pipes -- Determination of the apparent initial circumferential tensile strength ISO 10156, Gases and gas mixtures — Determination of fire potential and oxidizing ability for the selection of cylinder valve outlets ISO 10618, Carbon fibre -- Determination of tensile properties of resin-impregnated yarn ISO 14130, Fibre-reinforced plastic composites -- Determination of apparent interlaminar shear strength by short-beam method ISO 15512, Plastics - Determination of water content ASTM D 2196-86, Test methods for rheological properties of non-newtonian materials by rotational (Brookfield) viscometer ASTM D 2290-92, Test method for apparent tensile strength of ring or tubular plastics and reinforced plastics by split disk method ASTM D 2291-83, Fabrication of ring test specimens for glass-resin composites ASTM D 2343-03, Test Method for Tensile Properties of Glass Fiber Strands, Yarns, and Rovings Used in Reinforced Plastics ASTM D 2344-84, Test method for apparent interlaminar shear strength of parallel fiber composites by short beam method ASTM D 3418-99, Standard test method for transition temperature of polymers by differential scanning calorimetry ASTM D 4018-93, Test methods for tensile properties of continuous filament carbon and graphite fibre tows 3 Terms, definitions and symbols For the purposes of this European Standard, the following terms, definitions and symbols apply. 3.1 Terms and definitions 3.1.1 ambient temperature temperature of surroundings varying between 10 °C and 35 °C (for test purposes only) 3.1.2 autofrettage pressure application procedure which strains the metal liner past its yield point sufficiently to cause permanent plastic deformation, and results in the liner having compressive stresses and the fibres having tensile stresses when at zero internal gauge pressure 3.1.3 batch (of fibres, pre-impregnated fibres or components of the matrix system) homogeneous quantity of material, identified and certified as such by the supplier SIST EN 12245:2009
EN 12245:2009 (E) 8 3.1.4 batch (of metallic liners) quantity of liners of the same nominal diameter, thickness, length and design, made successively from the same material cast and subjected to the same heat treatment for the same length of time 3.1.5 batch (of non-metallic liners) quantity of liners of the same nominal diameter, thickness, length and design, made successively from the same batch of materials and subjected to the same manufacturing process 3.1.6 batch (of finished cylinders with liners) quantity of up to 200 finished cylinders, plus cylinders for destructive testing, of the same nominal diameter, thickness, length and design which may contain different batches of liners (providing the batches are nominally the same and have had the same treatments), fibres and matrix materials 3.1.7 batch (of finished cylinders with no liners) production quantity of up to 200 finished cylinders, plus cylinders for destructive testing, of the same nominal diameter, thickness, length and design 3.1.8 burst pressure highest pressure reached in a cylinder or liner during the relevant burst test 3.1.9 composite overwrap fibres and matrix taken together as a combined unit 3.1.10 elastomer material which at ambient temperature can be stretched repeatedly to at least twice its original length and will return with force to approximately its original length immediately upon release of the stress 3.1.11 exterior coating layer of clear or pigmented material applied to the cylinder as protection or for cosmetic purposes 3.1.12 fibre or strand load-carrying part of the composite overwrap e.g. glass, aramid or carbon 3.1.13 fully wrapped cylinder cylinder reinforced by wrapping to take both circumferential and longitudinal stress 3.1.14 liner metallic or non-metallic vessel that contains the gas but may also contribute to the mechanical behaviour of the cylinder 3.1.15 non-load sharing liner liner that contributes less than 5 % of the load bearing of the overall cylinder design at test pressure, and is intended only to prevent diffusion of the contained gas SIST EN 12245:2009
EN 12245:2009 (E) 9 3.1.16 non-metallic liner liner made from thermoplastic, thermosetting or elastomer material 3.1.17 cylinder without liner cylinder having no liner and consisting wholly of the composite winding 3.1.18 matrix material which is used to bind and hold the fibres in place 3.1.19 rejected cylinder cylinder which in its present condition has not passed the test requirements 3.1.20 thermoplastic plastics capable of being repeatedly softened by increase of temperature and hardened by decrease of temperature 3.1.21 thermoset plastics which, when cured by the application of heat or chemical means, change into a substantially infusible and insoluble product 3.2 Symbols pb actual burst pressure of composite cylinder, in bar 1) above atmospheric pressure
pbL
burst pressure of liner, in bar 1) above atmospheric pressure pbmin minimum burst pressure of composite cylinder obtained during design variant approval testing, in bar 1) above atmospheric pressure ph hydraulic test pressure of composite cylinder, in bar 1) above atmospheric pressure pmax maximum developed pressure at 65 °C, in bar 1) above atmospheric pressure 4 Design and manufacture 4.1 General A fully wrapped composite gas cylinder may be manufactured with a metallic or non-metallic liner or without a liner. Cylinders without a liner may be manufactured from two parts joined together with adhesive. An optional exterior coating may be used to provide external protection and when this is an integral part of the design shall be permanent. The cylinder may also include additional parts (e.g. rings and bases). Cylinders shall be designed with one or two openings along the central axis only.
1) 1 bar = 105 Pa = 0,1 MPa. SIST EN 12245:2009
EN 12245:2009 (E) 10 4.2 Liner 4.2.1 Metallic liners Metallic liners shall be manufactured in accordance with the relevant sections of: a) seamless steel liners:
EN 1964-1 or EN 1964-2, as appropriate; b) seamless stainless steel liners:
EN 1964-3; c) seamless aluminium alloy liners:
EN 1975; d) welded steel liners:
EN 13322-1 or prEN 14638-3, as appropriate; e) welded stainless steel liners:
EN 13322-2 or EN 14638-1, as appropriate; f) welded aluminium liners:
EN 12862; g) steel tubes (i.e. > 150 l):
EN ISO 11120. The relevant sections are those covering materials, thermal treatments, neck design, construction and workmanship and mechanical tests. NOTE This excludes the design requirements, since these are specified by the manufacturer for the design of the composite cylinder. For liners with water capacity above 150 l manufactured of stainless steel, aluminium or welded steel, the relevant sections of the appropriate standard also apply. The liner material shall be compatible with the gases intended to be used as determined by EN ISO 11114-1 and EN ISO 11114-4. 4.2.2 Non-metallic liners A cylinder with a non-metallic liner shall be designed as if the liner will be non-load sharing. The liner material shall be compatible with the gases intended to be used as determined by EN ISO 11114-2. Where a metal end boss is used in a non-metallic liner, it shall be considered part of the liner material and shall fulfil the material requirements specified in the relevant standard, as listed in 4.2.1. The drawing of the liner shall include the specification of the material and material properties of the boss. Important material properties shall be specified in the design and are those such as: a) minimum yield stress; b) minimum tensile strength; c) minimum elongation of the boss material; d) compatibility with the contained gas as determined by EN ISO 11114-1. The metal end boss bearing the cylinder thread shall be designed to withstand the torque applied in fitting the valve to the cylinder and the tests specified in Test 16 (see 5.2.16) and Test 17 (see 5.2.17). 4.2.3 Design drawing A fully dimensioned drawing of the liner shall be supplied which includes the specification of the material and material properties. Material and liner properties to be specified on the drawing are: a) for metallic liners: SIST EN 12245:2009
EN 12245:2009 (E) 11 1) minimum yield stress; 2) minimum tensile strength; 3) minimum elongation; 4) minimum burst pressure; 5) compatibility with the contained gas as determined by EN ISO 11114-1. b) for non-metallic liners: 1) density; 2) melting point, as determined by: i. ISO 3146 for thermoplastics; or ii. ISO 75-1 and ISO 75-3 for thermoset materials; 3) auto-ignition temperature in oxygen as determined by EN ISO 11114-3 (for cylinders
intended for air and oxidising gases (see ISO 10156 for definition of oxidising gases)); 4) glass transition temperature as determined by differential scanning calorimetry; 5) composition; 6) compatibility with the contained gas as determined by EN ISO 11114-2; 7) end boss design in accordance with 4.2.2. 4.2.4 Design of ends The external diameter and thickness of the formed neck end of the liner shall be designed to withstand the torque applied in fitting the valve to the cylinder and the tests specified in Test 16 (see 5.2.16) and Test 17 (see 5.2.17). 4.2.5 Neck ring When a neck ring is provided, it shall be of a material compatible with that of the cylinder, and shall be securely attached by a method appropriate to the liner (or cylinder for cylinders without liner) or boss material. 4.3 Composite overwrap 4.3.1 Materials Material requirements for the fibre and matrix or the pre-impregnated material shall be as specified by the manufacturer. 4.3.2 Winding Appropriate procedures shall be defined for the winding and curing process to ensure good repeatability and traceability. Parameters to be specified and monitored are: SIST EN 12245:2009
EN 12245:2009 (E) 12 a) composite overwrap component percentages; b) batch numbers of the material used as defined in 3.1.3; c) number of strands used; d) winding tension per strand (if applicable); e) winding speed(s); f) winding angle and/or pitch for each layer; g) resin bath temperature range (if applicable); h) temperature of the strand before consolidation (if applicable); i) number and order of layers; j) procedure used to obtain correct impregnation (e.g. wet winding or pre-impregnation); k) polymerisation cycle (if applicable); l) polymerisation process (e.g. thermal cycling, ultrasonic, ultraviolet or radiation). For thermal polymerisation, the temperature and the length of the polymerisation cycle of the resin system shall be such that they do not adversely affect the mechanical characteristics of the liner. In addition, tolerances for holding time and temperature at each stage shall be defined. 4.3.3 Cylinders without liners comprising two or more parts For cylinders without liners which comprise of two parts joined with adhesive, additional procedures and parameters shall be defined, monitored and recorded and are: a) adhesive system component percentages and batch numbers; b) polymerisation cycle; c) polymerisation process used (e.g. thermal cycling, ultrasonic, ultraviolet or radiation). 4.4 Finished cylinder 4.4.1 Design drawings A fully dimensioned drawing of all parts that constitute the finished cylinder shall be supplied. The design drawing shall include tolerances on all dimensions, including out-of-roundness and straightness. The drawing shall include the specification of the material(s), the material properties and the reinforcement pattern. The specifications and the reinforcement patterns may be given in a technical specification enclosed with the drawing. The details of an exterior coating, if it is an integral part of the design, shall be defined. The test pressure, autofrettage pressure (if applicable) and minimum burst pressure for the design shall be specified.
SIST EN 12245:2009
EN 12245:2009 (E) 13 Any special characteristics or special limitations (e.g. design life, underwater suitability, vacuum suitability and/or maximum fitting torque restrictions) shall be stated. 4.4.2 Cylinders without liner The requirements for the composite materials and their properties to be specified are: a) tensile strength; b) tensile modulus; c) elongation; d) heat distortion temperature; e) viscosity. The composite materials shall be compatible with the contained gas as determined by
EN ISO 11114-2. The auto-ignition temperature in oxygen gas shall be determined in accordance with EN ISO 11114-3 for cylinders intended for air, oxygen and oxidising gases. Where a metal end boss is used in a cylinder without liner, the drawing of the cylinder shall include the specification of the material and material properties of the boss in accordance with 4.2.2.2. 4.4.3 Autofrettage Internal pressurisation to autofrettage pressure of cylinders with metallic liners can be part of the manufacturing process; if so this operation shall be executed after polymerisation of the composite for thermosetting resins or after the consolidation process for thermoplastics. During the autofrettage operation, the parameters to be recorded are: a) autofrettage pressure; b) length of application of the autofrettage pressure; c) expansion at autofrettage pressure; d) permanent expansion after autofrettage. If autofrettage is used, a check shall be made on all cylinders that the procedure has been effectively performed. 4.4.4 Manufacturing requirements for the finished cylinder The internal and external surfaces of the finished cylinder shall be free of defects which can adversely affect the safe working of the cylinder. In addition, there shall be no visible foreign matter present inside the cylinder (e.g. resin, swarf or other debris). 5 Cylinder and material tests 5.1 General This clause describes tests to be conducted on fully wrapped composite cylinders, cylinder liners and the materials used in manufacture of cylinders for prototype testing of new cylinder designs, design SIST EN 12245:2009
EN 12245:2009 (E) 14 variant testing and production testing. The tests listed can be required or optional, as identified in the schedule of testing and inspections in Annex A. No tests shall be performed with a removable protective sleeve fitted to the cylinder. 5.2 Requirements and test methods 5.2.1 Test 1 – Composite material tests, including adhesives (where applicable) 5.2.1.1 All cylinders 5.2.1.1.1 Procedure Tests on the composite materials to establish their mechanical properties shall be carried out in accordance with: a) fibre tensile properties: 1) for glass, aramid:
ISO 8521 or ASTM D 2290-92 and ASTM D 2291-83; ISO 3341 or ASTM D 2343-03; 2) for carbon:
ISO10618 or ASTM D 4018-93; b) shear properties:
ISO 14130 or ASTM D 2344-84; c) matrix properties:
glass transition temperature: ASTM D 3418-99;
heat distortion temperature: ISO 75 -3;
viscosity:
ASTM D 2196-86.
Equivalent tests in accordance with alternative standards or test specifications acceptable to the inspection body may be applied. 5.2.1.1.2 Criteria The mechanical properties shall meet the minimum requirements for the design as specified by the manufacturer. 5.2.1.2 Additional tests for cylinders without liners 5.2.1.2.1 Procedure Additional tests on the composite materials and adhesives (if applicable) to establish their other physical prope
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