1、BSI Standards PublicationBS EN ISO 4126-6:2014Safety devices for protectionagainst excessive pressurePart 6: Application, selection andinstallation of bursting disc safety devicesBS EN ISO 4126-6:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO4126-6:201
2、4. It supersedes BS EN ISO 4126-6:2003 which iswithdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PSE/18/6, Industrial valves, steam traps, actuators andsafety devices against excessive pressure - Safety devices againstexcessive pressure.A list of organizations rep
3、resented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580
4、 72095 6ICS 13.240; 23.060.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 June 2014.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NO
5、RME EUROPENNE EUROPISCHE NORM EN ISO 4126-6 June 2014 ICS 13.240 Supersedes EN ISO 4126-6:2003English Version Safety devices for protection against excessive pressure - Part 6: Application, selection and installation of bursting disc safety devices (ISO 4126-6:2014) Dispositifs de scurit pour protec
6、tion contre les pressions excessives - Partie 6: Application, slection et installation des dispositifs de sret disque de rupture (ISO 4126-6:2014) Sicherheitseinrichtungen gegen unzulssigen berdruck - Teil 6: Berstscheibeneinrichtungen; Anwendung, Auswahl und Einbau (ISO 4126-6:2014) This European S
7、tandard was approved by CEN on 22 May 2014. 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 national standard without any alteration. Up-to-date lists and bibliographical references concerning
8、such national standards may be obtained on application to the CEN-CENELEC 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 translation under the responsibility of a CEN member into its
9、own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany
10、, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NO
11、RMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 4126-6:2014 EBS EN ISO 4126-6:2014EN ISO 4126-6:2014 (E) 3 Foreword This document (EN ISO 4126-6:2014)
12、has been prepared by Technical Committee ISO/TC 185 “Safety devices for protection against excessive pressure” in collaboration with Technical Committee CEN/TC 69 “Industrial valves” the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, e
13、ither by publication of an identical text or by endorsement, at the latest by December 2014, and conflicting national standards shall be withdrawn at the latest by December 2014. 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 supersedes EN ISO 4126-6:2003. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard:
15、Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, S
16、weden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 4126-6:2014 has been approved by CEN as EN ISO 4126-6:2014 without any modification. BS EN ISO 4126-6:2014ISO 4126-6:2014(E) ISO 2014 All rights reserved iiiContents PageForeword ivIntroduction vi1 Scope . 12 Norma
17、tive references 13 Terms and definitions . 14 Symbols and units . 55 Application . 66 Selection 86.1 Selection of bursting disc safety devices 86.2 Selection of the performance tolerance 107 Installation 127.1 General 127.2 Location of bursting disc safety devices 127.3 Installation of bursting disc
18、 safety devices . 12Annex A (informative) Information to be supplied by the purchaser .14Annex B (informative) Guidelines for determining the replacement period of a bursting disc 16Annex C (informative) Pressure relief system discharge capacity .18Annex D (informative) Flow testing of bursting disc
19、 safety devices .21Annex E (informative) Type testing of non-reclosing bursting disc safety devices 35Annex F (informative) Performance characteristics of bursting disc safety devices 37Bibliography .39BS EN ISO 4126-6:2014ISO 4126-6:2014(E)ForewordISO (the International Organization for Standardiza
20、tion) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be
21、represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to
22、develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
23、 ISO/IEC Directives, Part 2. www.iso.org/directivesAttention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the
24、 development of the document will be in the Introduction and/or on the ISO list of patent declarations received. www.iso.org/patentsAny trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO s
25、pecific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT), see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 185, Safety dev
26、ices for protection against excessive pressure.This second edition cancels and replaces the first edition (ISO 4126-6:2003), which has been technically revised.The main technical modifications are:a) Revision to Annex C to refer to Part 7 for capacity calculations;b) Annex D was deleted as this info
27、rmation is found in Part 7;c) Annex E was revised to include methodology for establishing flow resistance values for bursting discs opened in incompressible fluid;d) Annex F was added to include existing and additional guidelines for type testing;e) Annex G was added to provide a place for informati
28、ve information relative to bursting disc tolerances and operating parameters.ISO 4126 consists of the following parts, under the general title Safety devices for protection against excessive pressure: Part 1: Safety valves Part 2: Bursting disc safety devices Part 3: Safety valves and bursting disc
29、safety devices in combination Part 4: Pilot operated safety valves Part 5: Controlled safety pressure relief systems (CSPRS) Part 6: Application, selection and installation of bursting disc safety devicesiv ISO 2014 All rights reservedBS EN ISO 4126-6:2014ISO 4126-6:2014(E) Part 7: Common data Part
30、9: Application and installation of safety devices excluding stand-alone bursting disc safety devices Part 10: Sizing of safety valves for gas/liquid two-phase flow Part 11: Performance testing1)Part 7 contains data, which is common to more than one of the parts of ISO 4126 to avoid unnecessary repet
31、ition.1) In development. ISO 2014 All rights reserved vBS EN ISO 4126-6:2014ISO 4126-6:2014(E)IntroductionSafety devices for the protection of pressure equipment against excessive pressure include pressure relief devices such as safety valves and bursting disc safety devices which, dependent upon th
32、e application, may be used either as the sole pressure relieving devices or in conjunction with each other.Operating problems frequently arise due to the use of pressure relieving devices not having been properly selected for the intended service or properly selected but whose performance is adverse
33、ly affected by improper handling, wrong installation or lack of maintenance, any of which may affect the safety of the pressure equipment being protected.It is important to consider not only the pressure relief devices but also the whole of the pressure relief system so as not to reduce the relievin
34、g capacity below that required or adversely affect the proper operation of the pressure relieving devices.A bursting disc safety device is a non-reclosing pressure relief device which typically comprises a bursting disc, which is a pressure-containing and pressure-sensitive part designed to open by
35、bursting at a predetermined pressure, and a bursting disc holder. There are many different types of bursting disc safety devices manufactured in corrosion resistant materials, both metallic and non-metallic, to cover a wide range of nominal sizes, burst pressures and temperatures. They are used to p
36、rotect pressure equipment such as vessels, piping, gas cylinders or other enclosures from excessive pressure and/or excessive vacuum.This standard covers the important considerations necessary in the application, selection and installation of bursting disc safety devices to give the required protect
37、ion against excessive pressure and/or excessive vacuum.vi ISO 2014 All rights reservedBS EN ISO 4126-6:2014INTERNATIONAL STANDARD ISO 4126-6:2014(E)Safety devices for protection against excessive pressure Part 6: Application, selection and installation of bursting disc safety devices1 ScopeThis Inte
38、rnational standard gives guidance on the application, selection and installation of bursting disc safety devices used to protect pressure equipment from excessive pressure and/or excessive vacuum.Annex A provides a checklist for the information to be supplied by the purchaser to the manufacturer.Ann
39、ex B gives guidance on the replacement period of a bursting disc.Annex C provides guidance for determining the discharge capacity, for single phase fluids, of a pressure relief system that contains a bursting disc safety device.Annex D is a non-mandatory procedure for establishing the flow resistanc
40、e of a burst bursting disc assembly.Annex E is a non-mandatory procedure for type testing of bursting disc safety devices.Annex F provides typical performance characteristics for various bursting disc safety device types.The requirements for the manufacture, inspection, testing, marking, certificati
41、on and packaging of bursting disc safety devices are given in ISO 4126-2.2 Normative referencesThe following referenced documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For und
42、ated references, the latest edition of the referenced document (including any amendments) applies.ISO 4126-2, Safety devices for protection against excessive pressure Part 2: Bursting disc safety devicesISO 4126-3, Safety devices for protection against excessive pressure Part 3: Safety valves and bu
43、rsting disc safety devices in combination3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 4126-2 and the following apply.3.1bursting disc safety devicenon-reclosing pressure relief device actuated by differential pressure and designed to function by th
44、e bursting of the bursting disc(s), and which is the complete assembly of installed components including, where appropriate, the bursting disc holder3.2bursting disc assemblycomplete assembly of components, which are installed in the bursting disc holder to perform the desired function ISO 2014 All
45、rights reserved 1BS EN ISO 4126-6:2014ISO 4126-6:2014(E)3.3bursting discpressure-containing and pressure-sensitive component of a bursting disc safety device3.4bursting disc holderthat part of a bursting disc safety device, which retains the bursting disc assembly in position3.5conventional domed bu
46、rsting disc (also referred to as, forward acting)bursting disc which is domed in the direction of the bursting pressure (i.e. where the bursting pressure is applied to the concave side of the bursting discNote 1 to entry: See ISO 4126-2:2003, Figure 1).3.6slotted lined bursting discbursting disc mad
47、e up of two or more layers, at least one of which is slit or slotted to control the bursting pressure of the bursting disc3.7reverse domed bursting disc (also referred to as, reverse acting)bursting disc which is domed against the direction of the bursting pressure (i.e. where the bursting pressure
48、is applied to the convex side of the bursting discNote 1 to entry: See ISO 4126-2:2003, Figure 2).3.8flat bursting discbursting disc having one or more layers which is flat when installed. It may be made of a ductile or brittle material3.9graphite bursting discbursting disc manufactured from graphit
49、e, impregnated graphite, flexible graphite or graphite composite and designed to burst due to bending or shearing forces3.10specified bursting pressurebursting pressure quoted with a coincident temperature when defining the bursting disc requirements (used in conjunction with a performance tolerance, see 3.14)3.11specified maximum bursting pressuremaximum bursting pressure quoted with the coincident temperature when defining the bursting disc requirements (used in conjunction with specified minimum bursting pressure, see 3.12)3.12specified m
