1、BRITISH STANDARD Transportable gas cylinders hoop-wrapped composite cylinders S e amle s s , The European Standard EN 12257:2002 has the status of a British Standard ICs 23.020.30 BS EN 12257:2002 Wk present to the responsible European committee any enquiries on the interpretation, or proposals for
2、change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cr oss-r e fer enc e s The British Standards which implement inte
3、rnational or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to inc
4、lude all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the
5、EN title page, pages 2 to 37 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. O BSI 28 March 2002 ISBN0 580 38155 2 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12257 February 2002 ICs 23.020.30 English version Transportable gas
6、 cylinders - Seamless, hoop-wrapped composite cylinders Bouteilles gaz transportables - Bouteilles sans soudure, frettes composites Ortsbewegliche Gasflaschen - Nahtlose umfangsgewickelte Flaschen aus Verbundwerkstoffen This European Standard was approved by CEN on 9 November 2001 CEN members are bo
7、und to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the M
8、anagement 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 translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as t
9、he official versions. 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 STANDAR
10、DIZATION EUROPISCHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Management Centre: rue de Stassart, 36 B-1050 Brussels O 2002 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12257:2002 E EN 12257:2002 (E) Con tents page Fore
11、word . 3 Introduction 4 1 Scope 5 2 Normative references 5 3 Terms. definitions and symbols 6 4 Design and manufacture 7 5 Cylinder and material tests 10 6 Conformity evaluation 21 7 Marking . 21 Annex A (normative) Prototype testing, design variant testing and production testing . 22 Annex B (infor
12、mative) Examples of type approval and production testing certificates 33 Bibliography . 37 2 EN 12257:2002 (E) Foreword This document Er 12257:2002 has been preparec by Technical Committee CEN/TC 23 “Transportable gas cylinders“, the secretariat of which is held by BSI. This European Standard shall
13、be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2002, and conflicting national standards shall be withdrawn at the latest by August 2002. This European Standard has been prepared under a mandate given to CEN by the Eur
14、opean Commission and the European Free Trade Association, and supports the objectives of the framework Directives on Transport of Dangerous Goods. 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 lis
15、ted in the normative references and covering basic requirements of the RID/ADR not addressed within the present standard are normative only when the standards themselves are referred to in the RID and/or the technical annexes of the ADR. Annex A is normative and annex B is informative. According to
16、the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,
17、Spain, Sweden, Switzerland and the United Kingdom. 3 EN 12257:2002 (E) I nt rod u cti on The purpose of this standard is to provide a specification for the design, manufacture, inspection and testing of refillable transportable seamless, hoop wrapped composite cylinders. The specifications given are
18、 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. 4 EN 12257:2002 (E) 1 Scope This European Standard specifies minimum requirements for the materials, des
19、ign, construction, prototype testing and routine manufacturing inspections of composite gas cylinders with a water capacity up to and including 450 litres for compressed, liquefied and dissolved gases. NOTE For the purposes of this standard, the word “cylinder” includes tubes up to 450 litres water
20、capacity. This standard is applicable to cylinders that comprise a seamless metal liner reinforced over a substantial part of the parallel length by wound composite fibres of glass, carbon, aramid, or wire. This standard is not applicable to gas cylinders which are almost totally covered with fibres
21、 and commonly called ”fully-wrapped” cylinders. For fully-wrapped composite cylinders see EN 12245. NOTE sleeves. Where these are fitted they should be considered separately. The specification does not address the design, fitting and performance of removable protective 2 Normative references This Eu
22、ropean Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate place in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publication
23、s apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 1089-1, Transportable gas cylinders- Gas cylinder identification (excluding L PG) - Part I: Stampmarkin
24、g. EN 1964-1, Transportable gas cylinders - Specification for the design and construction of refillable transportable seamless steel gas cylinders of water capacities from 0,s litre up to and including 150 litres - Part I: Cylinders made of seamless steel with an R, value of less than I 100 MPa. prE
25、N 1964-2, Transportable gas cylinders - Specification for the design and construction of refillable transportable seamless steel gas cylinders from 0,s litres up to and including 150 litres - Part 2: Tensile strength (R, max) 2 I 100 MPa. EN 1964-3, Transportable gas cylinders - Specification for th
26、e design and construction of refillable transportable seamless steel gas cylinders of capacity from 0,s litres up to 150 litres - Part 3: Stainless steel cylinders. EN 1975, Transportable gas cylinders - Specification for the design and construction of refillable transportable seamless aluminium and
27、 aluminium alloy gas cylinders of capacity from 0,s I up to 150 1. EN 10002-1, Metallic materials - Tensile testing - Part I: Method of test (at ambient temperature) EN IS0 1 1 1 14-1, Transportable gas cylinders - Compatibility of cylinder and valve materials with gas contents - Part I: Metallic Ma
28、terials (IS0 I I I 14- I: 1997). EN IS0 11 120, Gas Cylinders - Refillable seamless steel tubes of water capacity between 150 I and 3000 I - Design, construction and testing (IS0 I I 120: 1999). EN IS0 13341, Transportable gas cylinders - Fitting of valves to gas cylinders (IS0 1334 I: 1997). 5 EN 1
29、2257:2002 (E) ASTM D 2290-92, Test method for apparent tensile strength of ring or tubularplastics and reinforced plastics by split disk method. ASTM D 2291 -83, Fabrication of ring test specimens for glass-resin composites. ASTM D 2343-95, Test method for tensile properties of glass fibre strands,
30、yarns and rovings used in reinforced plastics. ASTM D 401 8-93, Test methods for tensile properties of continuous filament carbon and graphite fiber tows. 3 Terms, definitions and symbols For the purposes of this European Standard, the following terms, definitions and symbols apply. 3.1 Terms and de
31、finitions 3.1 .I 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
32、 having compressive stresses and the fibres having tensile stresses internally when at zero internal gauge pressure 3.1.3 batch, (of fibres, wires or components of the resin system) homogeneous quantity of material, identified and certified as such by the supplier 3.1.4 batch, (of metallic liners) q
33、uantity 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 finished cylinders with liners) quantity of up to 200 finished cylinders plus finished cyl
34、inders required for destructive testing, of the same nominal diameter, thickness, length and design. The batch may contain different batches of liners (providing the batches are nominally the same and have had the same treatments), fibres and matrix materials 3.1.6 burst pressure highest pressure re
35、ached in a cylinder or liner during the relevant burst test 3.1.7 composite overwrap fibres and matrix taken together as a combined unit, or wire reinforcement 3.1.8 exterior coating layer of clear or pigmented material applied to the cylinder for protection or for cosmetic purposes 6 EN 12257:2002
36、(E) 3.1.9 fibre or strand load-carrying part of the composite overwrap e.g. glass, aramid or carbon 3.1 .I O hoop-wrapped cylinder cylinder with composite overwrap along the cylindrical portion of the liner which carries part of the circumferential stress 3.1 .I 1 liner metallic cylinder that contai
37、ns the gas and provides a substantial structural strength to the composite cylinder 3.1.12 matrix material which is used to bind and hold the fibres in place 3.1.13 rejected cylinder cylinder which in its present condition has not passed the test requirements 3.1.14 wire reinforcement load carrying
38、overwrap, using a metallic wire (e.g. steel), that does not require a matrix 3.2 Symbols Pb PbL Pbmin actual burst pressure of composite cylinder, in bar) above atmospheric pressure burst pressure of liner, in bar) above atmospheric pressure minimum burst pressure of composite cylinder obtained duri
39、ng design variant testing, in ba?) above atmospheric pressure Ph hydraulic test pressure of composite cylinder, in bar) above atmospheric pressure 4 Design and manufacture 4.1 General 4.1.1 A hoop-wrapped composite gas cylinder shall comprise the following parts: - An internal metal liner, which car
40、ries the total longitudinal load and a substantial circumferential load; and either - a composite overwrap formed by layers of continuous fibres in a matrix; or - wire reinforcement. - An optional exterior coating to provide external protection. When this is an integral part of the design it shall b
41、e permanent. 1) 1 bar = IO5 Pa = 0,l MPa. 7 EN 12257:2002 (E) The cylinder can also include additional parts such as rings, bases, etc. 4.1.2 Cylinders shall be designed with one or two openings along the central axis only. 4.2 Liner 4.2.1 Liner materials The liners shall be manufactured in accordan
42、ce with the relevant sections of the following European standards: a) seamless steel liners: EN 1964-1 or prEN 1964-2 as appropriate; b) seamless stainless steel liners: EN 1964-3; c) seamless aluminium alloy liners: EN 1975; d) steel tubes (.e. I50 I): EN IS0 11 120. The relevant sections are: mate
43、rials, thermal treatments, neck design, construction and workmanship, 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 I manufactured of stainless steel or al
44、uminium alloy 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 IS0 11114-1. 4.2.2 Design drawing A fully dimensioned drawing of the liner shall be supplied which includes the specification of t
45、he material and material properties. The following material properties shall be specified: - minimum yield stress; - minimum tensile strength; - minimum elongation; - minimum burst pressure; - compatibility with the contained gas as determined by EN IS0 11 114-1 4.2.3 Design of ends (heads and bases
46、) The design of the ends shall be in accordance with the general requirements of the relevant cylinder standard (as identified in 4.2.1). In order to achieve satisfactory stress distribution, the liner wall thickness shall increase progressively in the transition zone between the cylindrical shell a
47、nd the ends, particularly the base. 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 No 12 (see 5.2.12) and Test No 13 (see 5.2.13). 8 EN 12257:2002 (E) 4.2.
48、4 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 material. 4.3 Composite overwrap 4.3.1 Materials Material requirements for the fibre and the matrix, and for the wire where ap
49、propriate, shall be as specified by the cylinder manufacturer. 4.3.2 Winding Appropriate procedures shall be defined for the winding and curing process to ensure good repeatability and traceability. The following parameters shall be defined and monitored: - percentages of the components of the matrix system and their batch numbers; - the batch numbers of the fibres or wire used; - the number of strands used; - the winding tension per strand or wire, (if applicable); - the winding speed(s); - the winding angle and/or pitch for each layer; - resin bath temperature range, (if appl
