1、February 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; 23.060.40!
2、$Uv_“1508360www.din.deDDIN EN 13648-1Cryogenic vessels Safety devices for protection against excessive pressure Part 1: Safety valves for cryogenic serviceEnglish version of DIN EN 13648-1:2009-02Kryo-Behlter Sicherheitseinrichtungen gegen Druckberschreitung Teil 1: Sicherheitsventile fr den Kryo-Be
3、triebEnglische Fassung DIN EN 13648-1:2009-02SupersedesDIN EN 13648-1:2002-09www.beuth.deDocument comprises 16 pagesDIN EN 13648-1:2009-02 2 National foreword This standard has been prepared by Technical Committee CEN/TC 268 “Cryogenic vessels” (Secretariat: AFNOR, France). The responsible German bo
4、dy involved in its preparation was the Normenausschuss Druckgasanlagen (Pressurized Gas Installations Standards Committee), Technical Committee NA 016-00-05 AA Kryo-Behlter; Spiegelausschuss zu CEN/TC 268 und ISO/TC 220. Amendments This standard differs from DIN EN 13648-1:2002-09 as follows: a) Cla
5、use 5 “Testing” has been revised and brought in line with the current rules of presentation. Previous editions DIN EN 13648-1: 2002-09 EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 13648-1November 2008ICS 23.020.40; 23.060.40 Supersedes EN 13648-1:2002 English VersionCryogenic vessels - Safety d
6、evices for protection againstexcessive pressure - Part 1: Safety valves for cryogenic serviceRcipients cryogniques - Dispositifs de protection contreles surpressions - Partie 1: Soupapes de sret pourservice cryogniqueKryo-Behlter - Sicherheitseinrichtungen gegenDruckberschreitung - Teil 1: Sicherhei
7、tsventile fr denKryo-BetriebThis 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 EuropeanStandard the status of a national standard without any alteration. Up-to-date list
8、s and bibliographical references concerning such nationalstandards 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 any other language made by translationunder the respons
9、ibility of a CEN member into its own language and notified to the CEN Management Centre has 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
10、, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassar
11、t, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13648-1:2008: EEN 13648-1:2008 (E) 2 Contents page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Requirements.6 4.1 General6 4.2 D
12、esign .7 4.2.1 Design temperature .7 4.2.2 Drainage7 4.2.3 Stem guiding 7 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 Oxygen compatibility 8 4.3.5 Acetylene compatibility.8 4.3.6 Non-metallic materials 8
13、 5 Testing 8 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 Cleanliness .11 8 Marking .12 Annex ZA (informative) Relationship between this E
14、uropean Standard and the Essential Requirements of EC Directive 97/23/EC (PED) 13 Bibliography 14 DIN EN 13648-1:2009-02 EN 13648-1:2008 (E) 3 Foreword This document (EN 13648-1:2008) has been prepared by Technical Committee CEN/TC 268 “Cryogenic vessels”, the secretariat of which is held by AFNOR.
15、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 by May 2009. Attention is drawn to the possibility that some of the el
16、ements 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 prepared under a mandate given to CEN by the European Commission and the Europ
17、ean 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 composed of the following Parts: EN 13648-1, Cryogenic vessels Safety de
18、vices 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 cryogenic service; EN 13648-3, Cryogenic vessels Safety devices for protection
19、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 this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Repu
20、blic, 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 13648-1:2009-02 EN 13648-1:2008 (E) 4 1 Scop
21、e 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 to operation at ambient temperature. It is a requirement of this Eur
22、opean 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 which is partially liquid because of its low temperature (including to
23、tally 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 categories are designed to relieve single phase vapours or gases. A va
24、lve 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 97/23/EC) and category 3 of TPED (Directive 99/36/EC). NOTE 3 This Eu
25、ropean 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 indispensable for the application of this document. For dated references,
26、 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 -80C EN 1252-2, Cryogenic vessels Materials Part 2: Toughness requir
27、ements 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 pressure Part 1: Safety valves (ISO 4126-1:2004) EN ISO 4126-4:2004, S
28、afety 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 size) alphanumeric designation of size for components of a pipework sys
29、tem, 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 connections adapted from EN ISO 6708:1995 3.2 pressure gauge pressure that
30、 is the value which is equal to the algebraic difference between the absolute pressure and the atmospheric pressure DIN EN 13648-1:2009-02 EN 13648-1:2008 (E) 5 3.3 specified minimum temperature lowest temperature for which the safety valve is specified 3.4 safety valve category A safety valve which
31、 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 valve category B safety valve which would not be expected to relie
32、ve 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 supercritical fluids. The refrigerated but non-toxic gases given in
33、Table 1 and mixtures of them are referred to as cryogenic fluids. DIN EN 13648-1:2009-02 EN 13648-1:2008 (E) 6 Table 1: Refrigerated but non-toxic gases Item and group Identification number, name and description a3 A Asphyxiant gases 1913 Neon, refrigerated liquid 1951 Argon, refrigerated liquid 196
34、3 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 liquid, N.O.S. b3 O Oxidizing gases 1003 Air, refrigerated li
35、quid 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 Hydrogen, refrigerated liquid 1972 Methane, refrigerated liquid or n
36、atural 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 Gas, refrigerated liquid, flammable, N.O.S ba Item and group, i
37、dentification 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 plus overpressure NOTE For set pressure and overpressure definition
38、s 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 applied. DIN EN 13648-1:2009-02 EN 13648-1:2008 (E) 7 4.2 Design 4
39、.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 of water within it, even when the specified outlet connection
40、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 that the effectiveness of the guiding cannot be defeated by nor
41、mal 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. 4.2.5 Sublimating cryogens Where the valve is specified as suitab
42、le 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 or vapour directly to solid, for example CO2, the design shal
43、l 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 valves (prevention of embrittlement, gas compatibility, etc.). N
44、OTE 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 process fluid. The materials of all components shall have me
45、chanical 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 resistance In addition to resistance to normal atmospheric corros
46、ion (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 careful consideration shall be given before selection of these mat
47、erials for components under stress. DIN EN 13648-1:2009-02 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 valve is intended for service with oxygen or oxidising p
48、roducts, 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 materials Non-metallic materials are, so far, well establishe
49、d 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 requirements 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 wit
