1、BRITISH STANDARD Cryogenic vessels Safety devices for protection against excessive pressure Part 2: Bursting disc safety devices for cryogenic service The European Standard EN 13648-2:2002 has the status ofa British Standard ICs 23.060.40 BS EN 13648-212002 NO COPYING WITHOUT BSI PERMISSION EXCEPT A
2、S PERMITTED BY COPYRIGHT LAW BS EN 13648-212002 National foreword This British Standard is the official English language version of The UKparticipation in its preparation was entrusted toTechnica1 Committee PVE/l 8, Cryogenic vessels, which has the responsibility to: EN 13648-212002. - - aid enquire
3、rs 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 in the UK. - A list of organizations re
4、presented 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 Ind
5、ex?, or by using the ?Search?faci1ity ofthe BSI Electronic Catalogue or ofBritish Stan dards Online. This publication does not purport to include all the necessary provisions of a contract. Users of this publication are responsible for their correct application. Compliance with a British Standard do
6、es not ofitself confer immunity from legal obligations. 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 3 July 2002 Summary of pages This docum
7、ent comprises a front cover, an inside front cover, the EN title page, pages 2 to 8, 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.No. I Date I Comments O BSI 3 July 2002 I
8、SBN O 580 39973 7 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13648-2 May 2002 ICs 23.060.40 English version Cryogenic vessels - Safety devices for protection against excessive pressure - Part 2: Bursting disc safety devices for cryogenic service Rcipients cryogniques - Dispositifs de prote
9、ction contre les supressions - Partie 2: Dispositif de scurit disque de rupture pour service cryognique Kryo-Behlter - Sicherheitseinrichtungen gegen Druckberschreitung - Teil 2: Berstscheibeneinrichtungen This European Standard was approved by CEN on 5 April 2002 CEN members are bound to comply wit
10、h the CENKENELEC 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 Management Centre
11、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 Management Centre has the same status as the official versi
12、ons. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION EUROPISC
13、HES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Management Centre: rue de Stassart, 36 B-1050 Brussels O 2002 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13648-2:2002 E EN 13648-212002 (E) Contents page Foreword 3 1 2 3 4
14、 4.1 4.2 4.2.1 4.2.2 4.2.3 4.3 4.3.1 4.3.2 4.3.3 4.3.4 4.3.5 4.3.6 5 5.1 5.2 5.2.1 5.2.2 6 7 8 Scope 4 Normative references 4 Terms and definitions 5 Requirements . 5 General 5 Design . 5 Design temperature . 5 Coincident temperature . 5 Sublimating cryogens . 6 Materials 6 General 6 Metallic materi
15、als . 6 Corrosion resistance . 6 Oxygen compatibility . 6 Acetylene compatibility . 6 Non-metallic materials . 6 Production testing . 7 Additional tests for bursting disc safety devices with non-replaceable bursting disc assemblies 7 Leak tests 7 Visual examination 7 Cleanliness . 7 Pressure and bur
16、st tests . 7 Marking . 7 Prevention of substitution 7 Annex ZA (informative) Clauses of this European Standard addressing essential requirements or other provisions of EU Directives 8 2 EN 13648-212002 (E) Foreword This document (EN 13648-2:2002) has been prepared by Technical Committee CEN/TC 268 “
17、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 November 2002, and conflicting national standards shall be withdrawn at the latest by
18、 November 2002. 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 of EU Directive(s). For relationship with EU Directive(s), see informative annex ZA, which is an integral part of this
19、document. This document also supports the objectives of the framework Directives on Transport of Dangerous Goods. This standard has been submitted for reference into the RID and/or the technical annexes of the ADR. This European Standard is composed of the following Parts EN 13648-1, Cryogenic vesse
20、ls - Safety devices for protection against excessive pressure - Part I : Safety valves for cryogenic service ; EN 13648-2, Cryogenic vessels - Safety devices for protection against excessive pressure - Part 2 : Bursting discs safety devices for cryogenic service ; prEN 13648-3, Cryogenic vessels - S
21、afety devices for protection against excessive pressure - Part 3 : Determination of required discharge - Capacity and sizing. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belg
22、ium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. 3 EN 13648-212002 (E) 1 Scope This European Standard specifies the requirements for the design, manufacture an
23、d testing of bursting disc safety devices for cryogenic service, .e. for operation with cryogenic fluids below - 10 “C in addition to operation at ambient temperature. It is a requirement of this standard that the bursting disc safety device(s) comply with prEN IS0 4126-2. In the event of different
24、requirements, this standard takes precedence over that standard. This standard is restricted to bursting disc safety devices not exceeding a size of DN 100 designed to relieve single phase vapours or gases. A bursting disc assembly can be specified, constructed and tested such that it is suitable fo
25、r use with more than one gas or with mixtures of gases. NOTE cryogenic vessel. Such methods are provided in prEN 13648-3. This standard does not provide methods for determining the capacity of bursting disc safety devices for a particular 2 Normative references This European Standard incorporates, b
26、y 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 of any of these publications apply to this European stan
27、dard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 1251-1 :2000, Cryogenic vessels - Transportable vacuum insulated vessels of not more than I O00 litres volume - Part I: Fundamental
28、requirements. EN 1252-1 :1998, Cryogenic vessels - Materials - Part I: Toughness requirements for temperatures below - 80 OC. EN 1797-1, Cryogenic vessels - Gas/material compatibility - Part I: Oxygen compatibility. EN 12300:1998, Cryogenic vessels - Cleanliness for cryogenic service. EN IS0 6708:19
29、95, Pipework components - Definition and selection of DN (nominal size) (IS0 6708: 1995). prEN 1252-2, Cryogenic vessels - Materials - Part 2: Toughness requirements for temperatures between - 80 OC and - 20 OC. EN 13458-1, Cryogenic vessels - Static vacuum insulated vessels - Part I: Fundamental re
30、quirements. EN 13530-1, Cryogenic vessels - Large transportable vacuum insulated vessels - Part I: Fundamental requirements. prEN 13648-3, Cryogenic Vessels - Safety devices for protection against excessive pressure - Part 3: Determination of required discharge - Capacity and sizing. prEN IS0 4126-2
31、, Safety devices for protection against excessive pressure - Part 2: Bursting disc safety devices (ISO/FDIS 4 126-2:2002). 4 EN 13648-212002 (E) 3 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply in addition to those given in prEN IS0 4126-2
32、. 3.1 DN (nominal size) alphanumeric designation of size for components of a pipework system, which is used for reference purposes. It comprises the letters DN followed by a dimensionless whole number which is indirectly related to the physical size, in millimetres, of the bore or outside diameter o
33、f the end connections EN IS0 6708:1995 3.2 pressure pressure for which the value is equal to the algebraic difference between the absolute pressure and the atmospheric pressure 3.3 specified minimum temperature lowest temperature for which the bursting disc safety device is specified 3.4 specified m
34、aximum temperature highest temperature for which the bursting disc safety device is specified 3.5 coincident temperature temperature of the bursting disc associated with a bursting pressure and which is the expected temperature of the bursting disc at the pressure in the emergency situation 3.6 cryo
35、genic fluids fluid defined as cryogenic fluid in EN 1251-1:2000 or prEN 13458-1 or prEN 13530-1 NOTE This includes totally evaporated liquids and supercritical fluids. 3.7 bursting disc safety device with a non-replaceable bursting disc assembly bursting disc safety device whose bursting disc assemb
36、ly is permanently joined to the bursting disc holder by the manufacturer 4 Requirements 4.1 General The bursting disc safety device shall satisfy all the requirements of prEN IS0 4126-2 except in event of different requirements, where this standard takes precedence. 4.2 Design 4.2.1 Design temperatu
37、re The specified minimum temperature shall be equal to the equilibrium temperature at atmospheric pressure of the coldest fluid to be relieved. The specified maximum temperature shall be + 65 “C unless a higher temperature is specified in the purchase order. 4.2.2 Coincident temperature The coincide
38、nt temperature shall be 20 “C unless otherwise specified by the purchase order 5 EN 13648-212002 (E) 4.2.3 Sublimating cryogens Where the bursting disc safety device is specified as suitable for service with products that, when vented to atmosphere from a pressure anywhere between the devices specif
39、ied maximum and minimum bursting pressures and at a temperature anywhere between the devices specified maximum and minimum temperatures, condense from gas or vapour directly to solid, e.g. CO, , the design shall be such as to avoid reduction of the discharge area below that required due to accumulat
40、ion of solid product. 4.3 Materials NOTE This clause indicates important material properties for safe use of safety valves (absence of brittleness, gas compatibility, etc.). It does not address all the PED essential requirements relevant to materials (e.g. no recommended materials are listed). 4.3.1
41、 General Materials shall be compatible with the process fluid. 4.3.2 Metallic materials Metallic materials shall be in conformance with EN 1252-1:1998 or prEN 1252-2 as appropriate to the specified minimum temperature. The strength of the materials shall be adequate for their duty at the maximum spe
42、cified tem perature. 4.3.3 Corrosion resistance In addition to normal atmospheric corrosive agents associated with industrial atmospheres the environment surrounding cryogenic vessels is characteristically one of persistent low ambient temperatures together with high humidity. Thus particular care m
43、ust be taken to ensure that the selected materials of the bursting disc, together with any coating, and of the bursting disc safety device are appropriate such that premature failure or any other malfunction cannot occur. Aluminium discs shall be coated with a corrosion resistant polymer on the atmo
44、spheric side only. Some copper alloys are susceptible to stress corrosion cracking, consequently careful consideration shall be given before selection of these materials for components under stress. 4.3.4 Oxygen compatibility If the specified minimum temperature is equal to or below the boiling poin
45、t of air or the bursting disc assembly is intended for service with oxygen or oxidising products, the materials shall be oxygen compatible in accordance with EN 1797-1. 4.3.5 Acetylene compatibility Metallic materials shall contain less than 70 % copper if specified for use with mixtures containing
46、acetylene. 4.3.6 Non-metallic materials Non-metallic materials are, so far, well established for use for non-integral bursting discs and for seals and gaskets. If such materials are to be used for structural parts, such as the holder, they shall have properties appropriate to the application and at
47、least meet the requirements of 4.3.2. Non-metallic materials shall also : - have mechanical properties that will allow the bursting disc safety device to pass the tests defined in clause 5 ; - meet the requirements of 4.3.4. 6 EN 13648-212002 (E) 5 Production testing 5.1 Pressure and burst tests The
48、y shall be performed in accordance with the requirements of prEN IS0 4126-2. Bursting discs with a corrosion resisting coating shall have the effectiveness of that coating demonstrated prior to pressure testing. The pressure test medium shall be clean water for hydraulic tests or oil free air or an
49、inert gas such as nitrogen for pneumatic tests. 5.2 Additional tests for bursting disc safety devices with non-replaceable bursting disc assemblies 5.2.1 Leak tests Each bursting disc safety device with a non-replaceable bursting disc assembly shall be subjected to an appropriate leak test that will demonstrate the integrity of the joint between the bursting disc and its holder. Typical tests might include, but are not restricted to, a mass spectrometer sensing helium calibrated for a leak of 10 - mbar I/s, with vacuum on the vent side or a pneumatic leak test under water w
