1、BSI Standards PublicationBS EN ISO 4126-5:2013Safety devices for protectionagainst excessive pressurePart 5: Controlled safety pressure reliefsystems (CSPRS)Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted wi
2、thout license from IHS-,-,-BS EN ISO 4126-5:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO4126-5:2013. It supersedes BS EN ISO 4126-5:2004 which iswithdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PSE/18/6, Industria
3、l valves, steam traps, actuators andsafety devices against excessive pressure - Safety devices againstexcessive pressure.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a cont
4、ract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 66505 9ICS 13.240Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authorit
5、y of theStandards Policy and Strategy Committee on 31 July 2013.Amendments issued since publicationDate Text affectedCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EUROPEAN STAN
6、DARD NORME EUROPENNE EUROPISCHE NORM EN ISO 4126-5 July 2013 ICS 13.240 Supersedes EN ISO 4126-5:2004English Version Safety devices for protection against excessive pressure - Part 5: Controlled safety pressure relief systems (CSPRS) (ISO 4126-5:2013) Dispositifs de scurit pour protection contre les
7、 pressions excessives - Partie 5: Dispositifs de scurit asservis (CSPRS) (ISO 4126-5:2013) Sicherheitseinrichtungen gegen unzulssigen berdruck - Teil 5: Gesteuerte Sicherheitsventile (CSPRS) (ISO 4126-5:2013) This European Standard was approved by CEN on 28 December 2012. CEN members are bound to co
8、mply 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 such national standards may be obtained on application to the CEN-CENEL
9、EC 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 own language and notified to the CEN-CENELEC Management Centre has the
10、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, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembou
11、rg, 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 NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All
12、 rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 4126-5:2013: ECopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS
13、 EN ISO 4126-5:2013EN ISO 4126-5:2013 (E) 3 Foreword This document (EN ISO 4126-5:2013) has been prepared by Technical Committee ISO/TC 185 “Safety devices for protection against excessive pressure“ in collaboration with the Technical Committee CEN/TC 69 “Industrial valves” the secretariat of which
14、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 January 2014, and conflicting national standards shall be withdrawn at the latest by January 2014. Attention is drawn to the possi
15、bility 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 ISO 4126-5:2004. This document has been prepared under a mandate given to CEN by the Euro
16、pean Commission and the European Free Trade Association, and supports essential requirements of EU Directive. For relationship with EU Directive, see informative Annex ZA, which is an integral part of this document. According to the CEN-CENELEC Internal Regulations, the national standards organizati
17、ons of the following countries are bound to implement this European Standard: 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
18、, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 4126-5:2013 has been approved by CEN as EN ISO 4126-5:2013 without any modification. Copyright European Committee for Standardization Pr
19、ovided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 4126-5:2013EN ISO 4126-5:2013 (E) 4 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC (PED) This E
20、uropean Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association to provide one means of conforming to Essential Requirements of the New Approach Directive 97/23/EC (PED). Once this standard is cited in the Official Journal of the Eur
21、opean Communities under that Directive and has been implemented as a national standard in at least one Member State, compliance with the normative clauses of this standard given in Table ZA.1 confers, within the limits of the scope of this standard, a presumption of conformity with the corresponding
22、 Essential Requirements of that Directive and associated EFTA regulations. Table ZA.1 Correspondence between this International Standard and Directive 97/23/EC (PED) Sub-clauses of this International Standard Essential Requirements of Directive 97/23/EC (PED) Essential Requirements Annex I of PED 5,
23、6,7,8,9 Safety accessories 2.11.1 5.1.6 Safety of operation 2.3 5.1.7 Drain and venting 2.5 6.3 Proof test 3.2.2 10 Marking and labelling 3.3 WARNING: Other requirements and other EU Directives may be applicable to the products falling within the scope of this standard. Copyright European Committee
24、for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 4126-5:2013ISO 4126-5:2013(E) ISO 2013 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions . 14
25、 Symbols and units . 75 Design 75.1 General . 75.2 Valve end connections 95.3 Minimum requirements for springs 105.4 Materials 106 Production testing .106.1 Purpose . 106.2 General 106.3 Hydrostatic testing . 116.4 Pneumatic testing 116.5 Adjustment of set or cold differential test pressure 126.6 Se
26、at leakage test 126.7 Pressure seals . 127 Type testing.127.1 General 127.2 Tests to determine operating characteristics 147.3 Tests to determine flow characteristics 157.4 Determination of the coefficient of discharge .177.5 Certification of coefficient of discharge 177.6 Certification of CSPRS 178
27、 Determination of CSPRS performance 179 Sizing of CSPRS .1710 Marking and sealing .1810.1 Marking 1810.2 Sealing of a CSPRS . 19Bibliography .20Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license
28、 from IHS-,-,-BS EN ISO 4126-5:2013ISO 4126-5:2013(E)ForewordISO (the International Organization for Standardization) 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. Ea
29、ch member body interested in a subject for which a technical committee has been established has the right to be 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 Internatio
30、nal Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standards
31、 adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that some of the elements of this document may be the subject of
32、patent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 4126-5 was prepared by Technical Committee ISO/TC 185, Safety devices for protection against excessive pressure.This second edition cancels and replaces the first edition (ISO 4126-5:2004), which has b
33、een technically revised. It also incorporates the Technical Corrigenda ISO 4126-5:2004/Cor 1:2006 and ISO 4126-5:2004/Cor 2:2007.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 saf
34、ety devices Part 3: Safety valves and bursting disc 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 devices Part 7: Common data Part 9: Application and
35、 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 that is common to more than one of the parts of ISO 4126 to avoid unnecessary repetition.1) Under devel
36、opment.iv ISO 2013 All rights reservedCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 4126-5:2013INTERNATIONAL STANDARD ISO 4126-5:2013(E)Safety devices for protection
37、against excessive pressure Part 5: Controlled safety pressure relief systems (CSPRS)1 ScopeThis part of ISO 4126 specifies the requirements for controlled safety pressure relief systems (CSPRS) irrespective of the fluid for which they are designed.It is applicable for main valves having a flow diame
38、ter of 4 mm and above which are for use at pressures of 0,1 bar gauge and above. No limitation is placed on temperature.This is a product standard and is not applicable to applications.2 Normative referencesThe following referenced documents are indispensable for the application of this document. Fo
39、r dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 4126-7:2013, Safety devices for protection against excessive pressure Part 7: Common data3 Terms and definitionsFor the purposes of this do
40、cument, the following terms and definitions apply.3.1controlled safety pressure relief systemCSPRSsystem consisting of a main valve in combination with a control unitNote 1 to entry: See Figure 1 for the components of a CSPRS.Note 2 to entry: On reaching the set pressure, the operating forces on the
41、 main valve are by means of the control unit automatically applied, released or so reduced that a main valve discharges a specified quantity of the fluid so as to prevent the predetermined pressure being exceeded. The system is so designed that the main valve re-closes and prevents a further flow of
42、 fluid after normal pressure conditions of service have been restored.Note 3 to entry: Specific types of CSPRS are installed to protect the downstream system by preventing further fluid input (safety shut-off valve). In this case the closing function shall meet the same requirements as the opening f
43、unction of the relief valve (see 5.1.5).3.2main valvevalve consisting of the parts of a CSPRS through which the discharge capacity is achieved, and the actuator3.3relieving principleprinciple in which a main valve opens when the operating force is released or reduced, and in which the main valve clo
44、ses when the operating force is re-appliedNote 1 to entry: See Figure 2, Type 1. ISO 2013 All rights reserved 1Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 4126-5:20
45、13ISO 4126-5:2013(E)3.4loading principleprinciple in which a main valve opens when the operating force is applied, and in which the main valve closes when the operating force is removedNote 1 to entry: See Figure 2, Type 2.3.5control unitunit which establishes the opening and closing of the main val
46、veNote 1 to entry: The arrangement shall consist of redundant individual control paths in operation (see 5.1.13 and 5.1.15). The individual control path may consist of pressure tapping line, pressure sensor, sensing line, control module and control line see Figures 1 a), 1 b) and 1 c), principle for
47、 two control paths.3.6pressure tapping lineline to the pressure sensor3.7sensing lineline between the pressure sensor and control module3.8control lineline between the control module and the main valve3.9pressure sensorcomparator in which a predetermined adjustable value of pressure is compared with
48、 the actual system pressureNote 1 to entry: On reaching the predetermined pressure, a signal is transmitted to the control unit. The signal to the control unit is removed when the system pressure has been lowered to a predetermined pressure.3.10control modulemodule which transforms the signal from t
49、he pressure sensor into a force to operate the actuator of the main valve3.11closed circuit principleprinciple characterized by the fact that on failure of the external control energy, the control unit effects the loading or relief of the main valve3.12open circuit principleprinciple characterized by the fact that on fail
