BS EN 1626-2008 Cryogenic vessels - Valves for cryogenic service《低温容器 低温设施用阀门》.pdf

1、BS EN 1626:2008ICS 23.020.40;23.060.01NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDCryogenic vessels Valves for cryogenicserviceLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 03/06/2009 08:00, Uncontrolled Copy, (c) BSIThis British Standardwas publish

2、ed under theauthority of the StandardsPolicy and StrategyCommittee on 28 February2009 BSI 2009ISBN 978 0 580 58010 9Amendments/corrigenda issued since publicationDate CommentsBS EN 1626:2008National forewordThis British Standard is the UK implementation of EN 1626:2008. Itsupersedes BS EN 1626:1999

3、which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PVE/18, Cryogenic vessels.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a cont

4、ract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 03/06/2009 08:00, Uncontrolled Copy, (c) BSIBS EN 1626:2008EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN

5、1626November 2008ICS 23.020.40; 23.060.01 Supersedes EN 1626:1999 English VersionCryogenic vessels - Valves for cryogenic serviceRcipients cryogniques - Robinets pour usagecryogniqueKryo Behlter - Absperrarmaturen fr tiefkalten BetriebThis European Standard was approved by CEN on 13 September 2008.C

6、EN 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 appl

7、ication 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 ha

8、s 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, Portu

9、gal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means res

10、ervedworldwide for CEN national Members.Ref. No. EN 1626:2008: ELicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 03/06/2009 08:00, Uncontrolled Copy, (c) BSIBS EN 1626:2008EN 1626:2008 (E) 2 Contents Foreword . 3 1 Scope 4 2 Normative references 4 3 Terms and definitions . 5 4 Requirements. 5

11、5 Testing 7 6 Cleanliness . 9 7 Marking . 9 Annex A (informative) Recommended methods for leak tightness testing of cryogenic valves 10 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EC Directive 97/23/EC (PED) . 12 Licensed Copy: Wang Bin, ISO/E

12、XCHANGE CHINA STANDARDS, 03/06/2009 08:00, Uncontrolled Copy, (c) BSIBS EN 1626:2008EN 1626:2008 (E) 3 Foreword This document (EN 1626:2008) has been prepared by Technical Committee CEN/TC 268 “Cryogenic vessels”, the secretariat of which is held by AFNOR. This European Standard shall be given the s

13、tatus of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2009, and conflicting national standards shall be withdrawn at the latest by May 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject

14、of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document will supersede EN 1626:1999. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports e

15、ssential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this Europe

16、an 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 K

17、ingdom. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 03/06/2009 08:00, Uncontrolled Copy, (c) BSIBS EN 1626:2008EN 1626:2008 (E) 4 1 Scope This European Standard specifies the requirements for the design, manufacture and testing of valves for cryogenic service, i.e. for operation with cryo

18、genic fluids below - 10 C as well as at ambient conditions to allow for start-up and run-down. It specifies additional requirements for cryogenic service for the appropriate valve product standard. NOTE a cryogenic fluid (refrigerated liquefied gas) is a gas which is partially liquid because of its

19、low temperature (including totally evaporated liquids and supercritical fluids). It applies to sizes up to DN 150 including vacuum jacketed cryogenic valves. This European Standard is not applicable to safety valves and valves for liquefied natural gas (LNG). It is intended that the valve be designe

20、d and tested to satisfy a pressure rating (PN or Class). Valves may then be selected with a PN or Class equal to or greater than the maximum allowable pressure (PS) of the equipment with which it is to be used. 2 Normative references The following referenced documents are indispensable for the appli

21、cation 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 19, Industrial valves - Marking of metallic valves EN 736-1, Valves - Terminology - Part 1: Definition of types

22、of valves EN 736-2, Valves - Terminology - Part 2: Definition of components of valves EN 736-3, Valves - Terminology - Part 3: Definition of terms EN 1092-1, Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 1: Steel flanges EN 1251-1, Cryo

23、genic vessels - Transportable vacuum insulated vessels of not more than 1000 litres volume Part 1: Fundamental requirements EN 1252-1, Cryogenic vessels - Materials - Part 1: Toughness requirements for temperatures below - 80 C EN 1333, Flanges and their joints - Pipework components - Definition and

24、 selection of PN EN 1759-1, Flanges and their joint Circular flanges for pipes, valves, fittings and accessories, Class designated Part 1: Steel flanges, NPS to 24 EN 1797, Cryogenic vessels - Gas/material compatibility EN 12266-1, Industrial valves - Testing of valves - Part 1: Pressure tests, test

25、 procedures and acceptance criteria - Mandatory requirements EN 12266-2, Industrial valves - Testing of valves - Part 2: Tests, test procedures and acceptance criteria - Supplementary requirements EN 12300, Cryogenic vessels - Cleanliness for cryogenic service EN 12516-1, Industrial valves Shell des

26、ign strength Part 1: Tabulation method for steel valve shells EN 12516-2, Industrial valves - Shell design strength - Part 2: Calculation method for steel valve shells EN 12516-4, Industrial valves Shell design strength Part 4: Calculation method for valve shells manufactured in metallic materials o

27、ther than steel Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 03/06/2009 08:00, Uncontrolled Copy, (c) BSIBS EN 1626:2008EN 1626:2008 (E) 5 EN ISO 6708, Pipework components - Definition and selection of DN (nominal size) (ISO 6708:1995) 3 Terms and definitions For the purposes of this docum

28、ent, the terms and definitions given in EN 736-1, EN 736-2 and EN 736-3, and the following apply. 3.1 nominal size (DN) defined in accordance with EN ISO 6708 3.2 pressure rating either nominal pressure (PN) as defined in accordance with EN 1333 and EN 1092-1 or Class rating as defined in EN 1759-1

29、3.3 specified minimum temperature lowest temperature the valve is specified for 3.4 valve category A valves intended to be operated with normal frequency (above 20 cycles a year) 3.5 valve category B valves intended to be operated only occasionally i.e. with a frequency below 20 cycles a year 4 Requ

30、irements 4.1 Materials 4.1.1 Metallic materials Metallic materials to be used in the construction of cryogenic valves shall be suitable for general valve uses as defined in EN 12516-1, EN 12516-2 and EN 12516-4. In addition, the following requirements apply: 4.1.1.1 Toughness requirements Materials

31、which exhibit a ductile/brittle transition shall have minimum impact test values specified in EN 1252-1. These requirements apply only to the critical parts of the valve exposed to cryogenic temperatures (and not to control elements for example). Non ferrous materials which can be shown to have no d

32、uctile/brittle transition do not require additional impact tests. 4.1.1.2 Corrosion resistance Materials shall be resistant to or protected from normal atmospheric corrosion and to the medium handled. 4.1.1.3 Oxygen compatibility If the specified minimum temperature is equal to or below the boiling

33、point of air (approximately 190 C at atmospheric pressure) or the valve is intended for oxygen service the materials which are, or likely to be, in contact with oxygen or an oxygen enriched air shall be oxygen compatible in accordance with EN 1797. 4.1.1.4 Flammable gas compatibility For hydrogen se

34、rvice, see EN 1797. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 03/06/2009 08:00, Uncontrolled Copy, (c) BSIBS EN 1626:2008EN 1626:2008 (E) 6 Copper alloys less than 70 % of copper shall be used for fluids containing acetylene. 4.1.2 Non metallic materials Non metallic materials to be use

35、d in packing, seats and glands shall: - have mechanical properties which will allow the valves to pass the sample valve test for category A valves as defined in this standard (see 5.2); - be oxygen compatible, if applicable, see 4.1.1.3. If non metallic materials are used for structural parts, their

36、 suitability shall be proven. 4.2 Design 4.2.1 General The valves shall fulfil their function in a safe manner within the temperature range from + 65 C to their specified minimum temperature and the pressure range intended for use. 4.2.2 Packing gland Valves can have an extended stem. The length of

37、the extension shall be sufficient to maintain the stem packing at a temperature high enough to permit operation within the normal temperature range of the packing material. Valves without an extended stem shall have a stem packing capable of operating at the specified minimum temperature. The handle

38、 shall be designed to remain operable for the duration of the sample valve test in accordance with 5.2.3.2. Gland designs incorporating a gland nut with a male or female thread shall be such that the nut shall not unscrew unintentionally, for example when the valve is operated. 4.2.3 Operating posit

39、ions Valves with an extended stem shall be capable of operation with the valve stem at any position from the vertical to 25 above the horizontal. 4.2.4 Trapped liquid Cavities where liquid can be trapped and build up detrimental pressures due to evaporation or expansion of the liquid during warming

40、up of the valve are not permitted. NOTE For ball and gate valves this requirement can be met by the provision of a pressure relief hole or passage or other means, e.g. pressure relieving seats, to relieve pressure in the bonnet and body cavities to the upstream side of the valve. 4.2.5 Valve bonnet

41、Valve bonnets may be brazed, welded, bolted, screwed or union type. Union type bonnets shall not be used on valves greater than DN 50. Union nuts shall be locked to the body. Screwed bonnets shall also be secured by a union nut or another device offering equivalent safety. 4.2.6 Securing of gland ex

42、tension For bronze or copper alloy valves of PN 100 or greater, the gland extensions shall be mechanically secured in the bonnet prior to brazing. (For instance by screwing). Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 03/06/2009 08:00, Uncontrolled Copy, (c) BSIBS EN 1626:2008EN 1626:200

43、8 (E) 7 4.2.7 Seat (seating assembly) Valves may have metal/metal or metal/soft or soft/soft seating assembly. Soft seat materials shall be adequately supported to prevent cold flow of the seat material or shall be backed by a secondary metal seat. 4.2.8 Blow-off safety of the spindle The valve stem

44、/shaft shall be secured so that it cannot be blown out of the body in the event of the gland being removed while the valve is under pressure. 4.2.9 Torque The maximum torque to operate manual valves under service conditions, when applied at the rim of the hand wheel or lever, shall not exceed 350 x

45、R N.m, except for valve seating and unseating, when it shall not exceed 500 x R Nm. For a hand-wheel, R is the radius of the wheel in meters. For a lever R is the length of the lever in meters minus 0,05 m. The valve shall be robust enough to withstand 1000 R N.m or equivalent in linear force as spe

46、cified above without damage. A lower value is permitted if there is a limiting torque or stroke device. Stems/shafts torsional strength within the pressure boundary shall be designed to exceed the torsional strength of the stem/shaft to the packing by at least 10 %. Valves intended for actuator oper

47、ation may have torque or linear force requirements deviating from the above. The sample valve tests shall then be performed including a proper actuator to operate the valve. 4.2.10 Electrical continuity and explosion proofness All valves shall have a maximum electrical resistance of 1000 in order to

48、 ensure electrical continuity to prevent build-up of static electricity. For flammable fluids, any equipment attached to or associated with a valve shall be suitable for the hazard zone. 5 Testing 5.1 Production tests The production test shall be performed in accordance with the requirements of appl

49、icable valve product standards. If these standards refer to EN 12266-1 and EN 12266-2, closure test leakage rate A is required. 5.2 Type testing 5.2.1 Selection of sample valves One sample valve shall be tested. It shall be representative of the valves to be produced. If a range of valves of identical design but with different size is to be tested, one sample of the smallest and one sample of the largest shall be tested. 5.2.2 Verification of the design A second sample valve shall be inspected to ensure that the design satisfies the requirements of