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1、BS EN 13648-1:2008 ICS 13.240;23.020.40;23.060.40 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Cryogenic vessels Safety devices for protection against excessive pressure Part 1: Safety valves for cryogenic service This British Standard was published under t
2、he authority of the Standards Policy and Strategy Committee on 28 February 2009 BSI 2009 ISBN 978 0 580 58011 6 Amendments/corrigenda issued since publication DateComments BS EN 13648-1:2008 National foreword This British Standard is the UK implementation of EN 13648-1:2008. It supersedes BS EN 1364
3、8-1:2002 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee PVE/18, Cryogenic vessels. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provi
4、sions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. BS EN 13648-1:2008 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13648-1 November 2008 ICS 23.020.40; 23.060.40Supersedes EN 13648-1:2002 E
5、nglish Version Cryogenic vessels - Safety devices for protection against excessive pressure - Part 1: Safety valves for cryogenic service Rcipients cryogniques - Dispositifs de protection contre les surpressions - Partie 1: Soupapes de sret pour service cryognique Kryo-Behlter - Sicherheitseinrichtu
6、ngen gegen Druckberschreitung - Teil 1: Sicherheitsventile fr den Kryo-Betrieb This European Standard was approved by CEN on 5 October 2008. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a nati
7、onal 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, French, German). A version in
8、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, Cyprus, Czech Republic, Denmark,
9、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 COMIT EUROPEN DE NORMALISATION
10、EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2008 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13648-1:2008: E BS EN 13648-1:2008 EN 13648-1:2008 (E) 2 Contents page Foreword3 1 Scope 4 2
11、Normative references4 3 Terms and definitions .4 4 Requirements.6 4.1 General6 4.2 Design.7 4.2.1 Design temperature.7 4.2.2 Drainage7 4.2.3 Stem guiding7 4.2.4 Inserts .7 4.2.5 Sublimating cryogens .7 4.3 Materials .7 4.3.1 General7 4.3.2 Metallic materials.7 4.3.3 Corrosion resistance.7 4.3.4 Oxyg
12、en compatibility 8 4.3.5 Acetylene compatibility.8 4.3.6 Non-metallic materials 8 5 Testing8 5.1 Production testing.8 5.2 Type testing for cryogenic service 8 5.2.1 General8 5.2.2 Seat leakage test8 5.2.3 Cryogenic tests9 6 Determination of the certified derated coefficient of discharge (Kdr)11 7 Cl
13、eanliness.11 8 Marking.12 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EC Directive 97/23/EC (PED) 13 Bibliography14 BS EN 13648-1:2008 EN 13648-1:2008 (E) 3 Foreword This document (EN 13648-1:2008) has been prepared by Technical Committee CEN/
14、TC 268 “Cryogenic vessels”, the secretariat of which is held by AFNOR. 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 May 2009, and conflicting national standards shall be withdrawn at the latest
15、 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 and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 13648-1:2002. This document has been prepare
16、d under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EC Directive(s) 97/23/EC. For relationship with EC Directive(s), see informative Annex ZA, which is an integral part of this document. This European Standard is c
17、omposed of the following Parts: EN 13648-1, Cryogenic vessels Safety devices for protection against excessive pressure Part 1: Safety valves for cryogenic service; EN 13648-2, Cryogenic vessels Safety devices for protection against excessive pressure Part 2: Bursting disc safety devices for cryogeni
18、c service; EN 13648-3, Cryogenic vessels Safety devices for protection against excessive pressure Part 3: Determination of required discharge Capacity and sizing. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement
19、 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
20、the United Kingdom. BS EN 13648-1:2008 EN 13648-1:2008 (E) 4 1 Scope This European Standard specifies the requirements for the design, manufacture and testing of safety valves for cryogenic service, that is to say for operation with cryogenic fluids (as defined in EN 1251-1) below 10 C in addition t
21、o operation at ambient temperature. It is a requirement of this European Standard that the valves comply with EN ISO 4126-1 or EN ISO 4126-4. In the event of different requirements, the requirements for cryogenic service are applied. NOTE 1 A cryogenic fluid (refrigerated liquefied gas) is a gas whi
22、ch is partially liquid because of its low temperature (including totally evaporated liquids and supercritical fluids). This European Standard is restricted to valves not exceeding a size of DN 100 for category B. The valves of category A are limited to DN 25 and set pressures up to 40 bars. Both cat
23、egories are designed to relieve single phase vapours or gases. A valve can be specified, constructed and tested such that it is suitable for use with more than one gas or with mixtures of gases. NOTE 2 All safety valves covered in this European Standard correspond to category IV of PED (Directive 97
24、/23/EC) and category 3 of TPED (Directive 99/36/EC). NOTE 3 This European Standard does not provide methods for determining the capacity of relief valve(s) for a particular cryogenic vessel. Such methods are provided in EN 13648-3. 2 Normative references The following referenced documents are indisp
25、ensable 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 1252-1, Cryogenic vessels Materials Part 1: Toughness requirements for temperatures below -
26、80C EN 1252-2, Cryogenic vessels Materials Part 2: Toughness requirements for temperatures between -80C and -20C EN 1797, Cryogenic vessels Gas/material compatibility EN 12300, Cryogenic vessels Cleanliness for cryogenic service EN ISO 4126-1:2004, Safety devices for protection against excessive pre
27、ssure Part 1: Safety valves (ISO 4126- 1:2004) EN ISO 4126-4:2004, Safety devices for protection against excessive pressure Part 4: Pilot operated safety valves (ISO 4126-4:2004) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 DN (nominal siz
28、e) alphanumeric designation of size for components of a pipework system, which is used for reference purposes and which comprises the letters DN followed by a dimensionless whole number that is indirectly related to the physical size, in millimetres, of the bore or outside diameter of the end connec
29、tions adapted from EN ISO 6708:1995 3.2 pressure gauge pressure that is the value which is equal to the algebraic difference between the absolute pressure and the atmospheric pressure BS EN 13648-1:2008 EN 13648-1:2008 (E) 5 3.3 specified minimum temperature lowest temperature for which the safety v
30、alve is specified 3.4 safety valve category A safety valve which might be expected to relieve periodically during operation of the cryogenic vessel due to the absence of an alternative relieving or control device EXAMPLE A pressure regulating vent valve designed for frequent operation. 3.5 safety va
31、lve category B safety valve which would not be expected to relieve during normal operation due to the provision of an alternative relieving or control device 3.6 cryogenic fluid gas which is partially liquid because of its low temperature NOTE The cryogenic fluids include evaporated liquids and supe
32、rcritical fluids. The refrigerated but non-toxic gases given in Table 1 and mixtures of them are referred to as cryogenic fluids. BS EN 13648-1:2008 EN 13648-1:2008 (E) 6 Table 1: Refrigerated but non-toxic gases Item and group Identification number, name and description a 3 A Asphyxiant gases 1913
33、Neon, refrigerated liquid 1951 Argon, refrigerated liquid 1963 Helium, refrigerated liquid 1970 Krypton, refrigerated liquid 1977 Nitrogen , refrigerated liquid 2187 Carbon dioxide, refrigerated liquid 2591 Xenon, refrigerated liquid 3136 Trifluoromethane, refrigerated liquid 3158 Gas, refrigerated
34、liquid, N.O.S. b 3 O Oxidizing gases 1003 Air, refrigerated liquid 1073 Oxygen, refrigerated liquid 2201 Nitrous oxide, refrigerated liquid, oxidizing 3311 Gas, refrigerated liquid, oxidizing, N.O.S b . 3 F Flammable gases 1038 Ethylene, refrigerated liquid 1961 Ethane, refrigerated liquid 1966 Hydr
35、ogen, refrigerated liquid 1972 Methane, refrigerated liquid or natural gas, refrigerated liquid, with high methane content 3138 Ethylene, acetylene and propylene mixture, refrigerated liquid, containing at least 71,5 % ethylene with not more than 22,5 % acetylene and not more than 6 % propylene 3312
36、 Gas, refrigerated liquid, flammable, N.O.S b a Item and group, identification number, name and description according to the United Nations. b N.O.S. = not otherwise specified. 3.7 relieving pressure pressure used for the sizing of a safety valve which is greater than or equal to the set pressure pl
37、us overpressure NOTE For set pressure and overpressure definitions see EN ISO 4126-1. 4 Requirements 4.1 General The valve shall satisfy all the requirements of EN ISO 4126-1 or EN ISO 4126-4 except in cases where these Standards include diverging requirements, then this European Standard shall be a
38、pplied. BS EN 13648-1:2008 EN 13648-1:2008 (E) 7 4.2 Design 4.2.1 Design temperature The valve shall be suitable for operation at all temperatures between the specified minimum temperature and + 65 C. 4.2.2 Drainage The design of the valve or its installation shall be such as to avoid accumulation o
39、f water within it, even when the specified outlet connection is fitted. 4.2.3 Stem guiding The design of guiding shall avoid malfunction of the valve due to deposition and freezing of atmospheric moisture on and within the valve during normal operation. The valve shall be sufficiently robust such th
40、at the effectiveness of the guiding cannot be defeated by normal handling. 4.2.4 Inserts Where soft disc inserts are used to ensure leak tight shut off (see 5.2.2), the design shall be such as to prevent cold flow of the insert to a degree that results in the valve failing to operate correctly. 4.2.
41、5 Sublimating cryogens Where the valve is specified as suitable for service with products that, when vented to atmosphere from any pressure between the valves relieving pressure and re-seating pressure and at any temperature within the valves specified operating temperature range, condense from gas
42、or vapour directly to solid, for example CO2, the design shall be such as to avoid the valve failing to operate correctly due to deposition of solid product within the valve body or its outlet. 4.3 Materials 4.3.1 General This clause indicates important material properties for safe use of safety val
43、ves (prevention of embrittlement, gas compatibility, etc.). NOTE It does not address all the PED essential requirements relevant to materials (in particular no recommended materials are listed). Materials that may come into contact with the process fluid during operation shall be compatible with the
44、 process fluid. The materials of all components shall have mechanical properties suitable for their minimum operating temperatures. 4.3.2 Metallic materials Metallic materials shall be in conformance with EN 1252-1or EN 1252-2 as appropriate to the specified minimum temperature. 4.3.3 Corrosion resi
45、stance In addition to resistance to normal atmospheric corrosion (or adequate protection), particular care shall be taken to ensure that the valve cannot be rendered inoperative by accumulation of corrosion products. Some copper alloys are susceptible to stress corrosion cracking, consequently caref
46、ul consideration shall be given before selection of these materials for components under stress. BS EN 13648-1:2008 EN 13648-1:2008 (E) 8 4.3.4 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
47、 valve is intended for service with oxygen or oxidising products, the materials shall be oxygen compatible in accordance with EN 1797. 4.3.5 Acetylene compatibility Metallic materials shall contain less than 70 % copper if specified for use with mixtures containing acetylene. 4.3.6 Non-metallic mate
48、rials Non-metallic materials are, so far, well established only for use on the disc or seat to provide leak tightness across the seat when the valve is closed. If such materials are to be used for structural parts, they shall have properties appropriate to the application and at least meet the requi
49、rements of 4.3.2. Non-metallic materials shall also: have mechanical properties that will allow the valve to pass the type testing defined in 5.2 ; be oxygen compatible if relevant (see 4.3.4 above). 5 Testing 5.1 Production testing It shall be performed in accordance with the requirements of EN ISO 4126-1 or EN ISO 4126-4. Where a pressure test is required the test medium shall be clean water for hydraulic tests or oil free air or an inert gas such as nitrogen for pneumatic tests. 5.2 Type testing for cryo
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