1、January 2009DEUTSCHE NORM English price group 10No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 23.020.40; 23.060.01!$
2、UM+“1504208www.din.deDDIN EN 1626Cryogenic vessels Valves for cryogenic serviceEnglish version of DIN EN 1626:2009-01Kryo-Behlter Absperrarmaturen fr tiefkalten BetriebEnglische Fassung DIN EN 1626:2009-01SupersedesDIN EN 1626:1999-05www.beuth.deDocument comprises 14 pagesDIN EN 1626:2009-01 2 Natio
3、nal foreword This standard has been prepared by Technical Committee CEN/TC 286 “Cryogenic vessels” (Secretariat: AFNOR, France). The responsible German body involved in its preparation was the Normenausschuss Druckgasanlagen (Pressurized Gas Installations Standards Committee), Technical Committee NA
4、 016-00-05 AA Kryo-Behlter; Spiegelausschuss zu CEN/TC 268 und ISO/TC 220. Amendments This standard differs from DIN EN 1626:1999-05 as follows: a) Clause 5 “Testing” has been revised. b) Clause 2 “Normative references” has been updated. c) The term “nominal pressure (PN)” (3.2) has been replaced by
5、 “pressure rating”. d) Figure A.1 “Valve test system” has been revised. Previous editions DIN EN 1626: 1999-05 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1626 November 2008 ICS 23.020.40; 23.060.01 Supersedes EN 1626:1999 English Version Cryogenic vessels - Valves for cryogenic service Rci
6、pients cryogniques - Robinets pour usage cryognique Kryo-Behlter - Absperrarmaturen fr tiefkalten Betrieb This European Standard was approved by CEN on 13 September 2008. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
7、 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 CEN Management Centre or to any CEN member. This European Standard exists in three official versions (English,
8、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 CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyp
9、rus, 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 STANDARDIZATION CO
10、MIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1626:2008: EEN 1626:2008 (E) Contents Foreword . 3 1 Scope 4 2
11、Normative references 4 3 Terms and definitions . 5 4 Requirements. 5 5 Testing 7 6 Cleanliness . 9 7 Marking . 9 Requirements of EC Directive 97/23/EC (PED) . 12 Annex ZA (informative) Relationship between this European Standard and the Essential Annex A (informative) Recommended methods for leak ti
12、ghtness testing of cryogenic valves 10 DIN EN 1626:2009-01 2 PageEN 1626:2008 (E) 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 status of a national s
13、tandard, 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 of patent rights. CEN
14、 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 essential requirements
15、 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 European Standard: Austria,
16、 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. DIN EN 1626:2
17、009-01 3 EN 1626:2008 (E) 1 Scope This European Standard specifies the requirements for the design, manufacture and testing of valves for cryogenic service, i.e. for operation with cryogenic fluids below - 10 C as well as at ambient conditions to allow for start-up and run-down. It specifies additio
18、nal 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 low temperature (including totally evaporated liquids and supercritical fluids). It applies to sizes up to DN 150 i
19、ncluding 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 designed and tested to satisfy a pressure rating (PN or Class). Valves may then be selected with a PN or Class equal to or
20、 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 application of this document. For dated references, only the edition cited applies. For undated references, the latest e
21、dition 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 of valves EN 736-2, Valves - Terminology - Part 2: Definition of components of valves EN 736-3, Valves - Terminolog
22、y - 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, Cryogenic vessels - Transportable vacuum insulated vessels of not more than 1000 litres volume Part 1: Fundamental requ
23、irements 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 selection of PN EN 1759-1, Flanges and their joint Circular flanges for pipes, valves, fittings and accessories, C
24、lass 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 procedures and acceptance criteria - Mandatory requirements EN 12266-2, Industrial valves - Testing of valves - Pa
25、rt 2: Tests, test procedures and acceptance criteria - Supplementary requirements EN 12300, Cryogenic vessels - Cleanliness for cryogenic service EN 12516-1, Industrial valves Shell design strength Part 1: Tabulation method for steel valve shells EN 12516-2, Industrial valves - Shell design strength
26、 - 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 other than steel DIN EN 1626:2009-01 4 EN 1626:2008 (E) EN ISO 6708, Pipework components - Definition and selection
27、of DN (nominal size) (ISO 6708:1995) 3 Terms and definitions For the purposes of this document, 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) a
28、s defined in accordance with EN 1333 and EN 1092-1 or Class rating as defined in EN 1759-1 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 in
29、tended to be operated only occasionally i.e. with a frequency below 20 cycles a year 4 Requirements 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-
30、4. In addition, the following requirements apply: 4.1.1.1 Toughness requirements Materials 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
31、not to control elements for example). Non ferrous materials which can be shown to have no ductile/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
32、Oxygen compatibility If the specified minimum temperature is equal to or below the boiling 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
33、 compatible in accordance with EN 1797. 4.1.1.4 Flammable gas compatibility For hydrogen service, see EN 1797. DIN EN 1626:2009-01 5 EN 1626:2008 (E) 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 used i
34、n 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 su
35、itability 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 the
36、 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 sh
37、all 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 position
38、s 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 up
39、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 Val
40、ve 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 exten
41、sion 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). DIN EN 1626:2009-01 6 EN 1626:2008 (E) 4.2.7 Seat (seating assembly) Valves may have metal/metal or metal/soft or soft/soft seat
42、ing 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/shaft shall be secured so that it cannot be blown out of the body in the event of the gland bein
43、g 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 R N.m, except for valve seating and unseating, when it shall not exceed 500 x R Nm. For a hand-wh
44、eel, 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 specified above without damage. A lower value is permitted if there is a limiting torque or stroke d
45、evice. 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 operation may have torque or linear force requirements deviating from the above. The sample valve tes
46、ts 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 ensure electrical continuity to prevent build-up of static electricity. For flammable fluids, an
47、y 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 applicable valve product standards. If these standards refer to EN 12266-1 and EN 12266-2, closure te
48、st 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 t
49、he 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 Clause 4. 5.2.3 Ambient condition tests 5.2.3.1 Initial tests The sample valve shall first pass the tests as described in 5.1. DIN EN 1626:2009-01 7 EN 1626:2008 (E) 5.2.3.2 Strength test The valve in a partially open position shall be hydraulically tested for at least 1 min with a pressure 4 times PN (or the maximum rated pressure) for valves with a PN lower than PN 100 (or Class lower th
