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1、BRITISH STANDARD BS EN 12434:2000 Incorporating Corrigendum No. 1 Cryogenic vessels Cryogenic flexible hoses The European Standard EN 12434:2000 has the status of a British Standard ICS 23.020.40; 23.040.70 ? Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:00:45 GMT+00:00 2006, Uncontrolle
2、d Copy, (c) BSI BS EN 12434:2000 This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 15 October 2000 BSI 4 October 2002 ISBN 0 580 36420 8 National
3、 foreword This British Standard is the official English language version of EN 12434:2000, including Corrigendum February 2001. The UK participation in its preparation was entrusted to Technical Committee PSE/18, Cryogenic vessels, which has the responsibility to: A list of organizations represented
4、 on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or b
5、y using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immun
6、ity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them
7、in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 18, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. N
8、o. DateComments 14115 Corrigendum No. 1 4 October 2002Correction to the technical committee details cited in the EN foreword Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:00:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12434 August 20
9、00 ICS 23.020.40; 23.040.70 Incorporating corrigendum February 2001 English version Cryogenic vessels - Cryogenic flexible hoses Rcipients cryogniques - Tuyaux flexibles cryogniquesKryo-Behlter - Kryoschlauchleitungen This European Standard was approved by CEN on 7 July 2000. CEN members are bound t
10、o comply with the CEN/CENELEC 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 Centr
11、al Secretariat 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 Central Secretariat has the same status as t
12、he official versions. 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 STANDARDIZATIO
13、N COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Central Secretariat: rue de Stassart, 36 B-1050 Brussels 2000 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12434:2000 E Licensed Copy: sheffieldun sheffieldun, na, S
14、at Oct 28 07:00:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 2 EN 12434:2000 Contents Page Foreword3 1Scope 4 2Normative references4 3Terms and definitions4 4General requirements5 4.1Design and construction.5 4.2Materials .6 4.3Cleanliness.6 4.4Mechanical properties.6 4.4.1Burst pressure .6 4.
15、4.2Pressure cycles6 4.4.3Bending.6 4.4.4Resistance to abuse6 4.4.5Low temperature resistance.6 4.4.6Leak tightness6 4.4.7Electrical properties 7 5Hose sample tests .7 5.1General7 5.2Non-destructive tests and inspection8 5.2.1Identification of materials .8 5.2.2Dimensional check 8 5.2.3Cleanliness ch
16、eck8 5.2.4Pressure test8 5.2.5Leak tests .8 5.2.6Crushing test9 5.3Destructive tests9 5.3.1Hydraulic pressure cycling.9 5.3.2Rolling bend cycling test 9 5.3.3Hydraulic bursting test9 5.3.4Examination of sectional cut10 6Production testing.10 6.1Pressure test10 6.2Leak test .10 7Marking.10 8Cleaning1
17、0 9Periodic examination.10 10Test certificate11 Annex A (normative) Typical hose assembly.12 Annex B (normative) Rolling bend cycling test for metallic hose assemblies and hose assemblies made of materials with a record of satisfactory use in cryogenic service 13 Annex C (normative) Rolling bend cyc
18、ling test for hose assemblies constructed from materials or composites not commonly used in cryogenic service15 Annex D (informative) Guidelines for periodic examination of transfilling hoses.17 Annex ZA (informative) Clauses of this European Standard addressing essential requirements or other provi
19、sions of EU directives. .18 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:00:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 3 EN 12434:2000 Foreword This European Standard has been prepared by Technical Committee CEN/TC 268 “Cryogenic vessels”, the secretariat of which is held by BSI
20、. 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 February 2001, and conflicting national standards shall be withdrawn at the latest by February 2001. This European Standard has been prepared unde
21、r a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this standard. According to the CEN/CENELEC Internal Regu
22、lations, 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, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the
23、United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:00:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 4 EN 12434:2000 1 Scope This standard gives design, construction, type and production testing, and marking requirements for non insulated cryogenic flexible hose used for t
24、he transfer of cryogenic fluids within the following range of operating conditions : ? working temperature: from - 270 C to + 65 C ; ? maximum nominal pressure: 80 bar ; ? nominal size (DN): from 10 to 100. End fittings for mounting of any couplings are within the scope of this standard, but the cou
25、plings are subject to other standards. It is intended that the hose be designed and tested to satisfy the generally accepted nominal pressure e.g. PN 40. Hoses may then be selected with a PN equal to or greater than the maximum allowable pressure (PS) of the equipment to which it is to be used. 2 No
26、rmative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions
27、of any of these publications 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 1252-1, Cryogenic vessels - Materials - Part 1 : Toughness requirements for
28、temperatures below - 80 C EN 1333, Pipework components - Definition and selection of PN EN 1797-1, Cryogenic vessels - Gas/materials compatibility - Oxygen compatibility EN 12300, Cryogenic vessels - Cleanliness for cryogenic service EN ISO 6708, Pipework components - Definition and selection of DN
29、(nominal size) (ISO 6708:1995) ISO 7369:1995, Pipework - Flexible metallic hoses - Vocabulary of general terms 3 Terms and definitions For the purposes of this Standard, in addition to those given in ISO 7369:1995, the following terms and definitions apply : 3.1 hose A flexible leak tight inner tube
30、 either corrugated metal, elastomer or plastic. 3.2 braid A layer, or layers, of cylindrically woven wires covering the hose and attached to the flexible hose assembly end fittings, serving the function of restraining the flexible hose against elongation. 3.3 protection coil or cover An outer coil o
31、r cover fitted to protect the main hose and braid against damage and abrasion. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:00:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 5 EN 12434:2000 3.4 end fitting A fitting (of material compatible with material and product transferred) atta
32、ched to each end of the hose and braid (when fitted). 3.5 hose assembly A hose with end fittings attached, complete with braid and/or other covering, ready for service. 3.6 nominal size (DN) As defined in EN ISO 6708. 3.7 nominal pressure (PN) As defined in EN 1333. NOTE 1PN ? PS (as defined in PED)
33、 NOTE 2See also the last sentence of the scope. 3.8 working temperature range The highest and lowest temperature to which the hose assembly is to be subjected. 3.9 cyclic life Minimum number of complete cycles which, at the test conditions, the hose assembly is designed to withstand without failure.
34、 4 General requirements 4.1 Design and construction The nominal pressure used during tests (see clause 5) shall be greater than or equal to the nominal pressure (PN) specified. In addition, the nominal pressure (PN) shall not be less than the maximum allowable pressure (PS) of the equipment to which
35、 it is to be used. A hose is typically made from corrugated metal, from strip steel. The corrugation may be parallel or helicoil. The nominal pressure stamped on the hose assembly shall be greater than or equal to the maximum pressure in service. If elastomers or composites are used, additional requ
36、irements shall be applied in accordance with 5.3.2.2. A braid is commonly fitted over the inner tube. This, generally, consists of woven wire in one or two layers, in stainless steel or a high strength copper alloy. It may have a cover, which shall be compatible with the surroundings and, normally,
37、with the conveyed fluid. The design shall ensure that pressurisation, or corrosion, between the inner tube and the outer braid or sheath is prevented. End fittings shall be designed as a rigid seal to the ends of a hose to ensure : ? a tight fixing to the hose ; ? a strong joint between the braid an
38、d hose to stabilise the hose against elongation at nominal pressure. An area for marking shall be provided on one of the end fittings. A typical cryogenic hose assembly is shown in annex A. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:00:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Pag
39、e 6 EN 12434:2000 4.2 Materials All materials shall be compatible with the fluid conveyed. End connections and couplings shall be made of materials compatible with the materials of the flexible hose assembly. A material is said to be compatible when it does not lead to any violent reaction (ignition
40、,etc.) or any slow reaction (ageing) with the conveyed gases, and has a little permeability. The materials used in a cryogenic hose assembly service shall : ? maintain sufficient ductility at the lowest working temperature (as specified in EN 1252-1) ; ? be oxygen compatible, if specified for oxygen
41、 or nitrous oxide service (as specified EN 1797-1) ; ? contain less than 70 % copper, in the alloy as well as the soldering materials, if it is specified for mixtures containing acetylene. 4.3 Cleanliness Hose assemblies specified for all cryogenic fluids shall be cleaned in accordance with EN 12300
42、. NOTEMeasures should be taken during manufacture to remove or avoid hydrocarbons, moistures, particles or other contaminations inside the hose assembly. 4.4 Mechanical properties 4.4.1 Burst pressure The burst pressure shall be at least three times the nominal pressure within the temperature range
43、of 270 C to + 65 C. Failure shall occur only in the body of the hose and braid and not in their connections. 4.4.2 Pressure cycles Hose assemblies shall have a minimum cyclic life 10 000 cycles when pressurised from 1 bar to nominal pressure repeatedly in accordance with 5.3.1. 4.4.3 Bending Hose as
44、semblies shall have a minimum cyclic life of 50 000 cycles when repeatedly rolled at nominal pressure in accordance with 5.3.2. 4.4.4 Resistance to abuse Hose assemblies should have a sufficient resistance to detoriation of the braid when they are dragged on the ground. For additional protection of
45、the braid, e.g. a coil can be used. Hose assemblies shall withstand to a crushing test, simulating a person stepping on the hose assembly, in accordance with 5.2.6. 4.4.5 Low temperature resistance All components of the hose assemblies which become cold during operation shall retain their toughness
46、at the lowest design temperature. 4.4.6 Leak tightness Hose assemblies shall be leak tight in accordance with 6.2. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 07:00:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 7 EN 12434:2000 4.4.7 Electrical properties Hose assemblies specified for
47、 flammable products shall be electrically conducting from one end to the other (electric resistance less than 0,5 ?). 5 Hose sample tests 5.1 General The hose sample test procedures shall include : a) Inspection and non-destructive tests : 1) inspection: dimensions, cleanliness, material identificat
48、ion and marking ; 2) tests: pressure test, leak and crushing tests. b) Destructive tests : ? pressure cycling, bursting test, rolling bend cycling and examination of sectional cut. The tests shall be recorded in a written report which shall be retained. Four hoses ( A, B, C and D ) are necessary to
49、perform hose sample tests for each hose sample of hose assembly. The tests and order of tests (1, 2, 3) are summarised in Table 1. Table 1 Testing scope and sequence TestsHose assembly ABCD 1 Non destructive tests a) Identification of materials b) Dimensional check c) Cleanliness check d) Pressure test 1111 e) Leak test43 f) Crushing test22-2 2 Destructive tests a) Hydraulic pressure cycling3- b) Rolling bend cycling-32- c) Hydraulic bursting45-3 d) Examination of a sectional cut-4- Licen
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