BS ENISO 4126-1:2013 Incorporating corrigendum October 2013 BSl Standards Publication Safety devices for protection against excessive pressure Part 1: Safety valves bsi. ..making excellence a habit: sefrom IHS BRITISH STANDARD BS EN ISO 4126-1:2013 National foreword This British Standard is the UK implementation of EN ISO 4126-1:2013. It supersedes BS EN ISO 4126-1:2004 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee PSE/18, Industrial valves, steam traps, actuators and safety devices against excessive pressure to PSE/18/6, Industrial valves, steam traps, actuators and safety devices against excessive pressure - Valve actuators. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Additional information Attention is drawn to 6.2 and the implications that hydrostatic pressure testing may be waived for certain types of safety valves. This might result inmanufacturersusingthis standardfailingtomeetthe essential safety requirements of 3.2.2, in the Pressure Equipment Regulations 1999 (as amended). This matter was raised with the Commission Working Group "Pressure" and a guideline issued to clarify the position (WGP Guideline 8/14 can be found on the European Commission website, http://ec.europa.eu/enterprise). Attention is drawn to National Annex NA (informative) and National Annex NB (informative), which are based on BS 6759-1:1984, BS 6759-2:1984 and BS 6759-3:1984. National Annex NA gives advice on performance testing of safety valves for hot water duty for UK users of this European Standard, and enables type test approval to be obtained. National Annex NB provides further supplementary information on materials, springs and the operating system, and guidance on safety valve mounting and installation. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. @ The British Standards Institution 2013. Published by BSI Standards Limited 2013 ISBN9780580845758 ICS 13.240 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2013. Amendments/corrigenda issued since publication Date Text affected 31 October 2013 National Annex NA implemented, additional National foreword text added networking permited without license from IHS EN ISO 4126-1 EUROPEANSTANDARD NORME EUROPEENNE EUROPAISCHE NORM July 2013 ICS 13.240 English Version Safety devices for protection against excessive pressure - Part 1: Safety valves (ISO 4126-1:2013) Dispositifsdesécuritepourprotectioncontrelespressions Sicherheitseinrichtungen gegen unzulassigen Uberdruck - excessives-Partie1:Soupapesdesurete(IsO4126- Teil 1: Sicherheitsventile (ISO 4126-1:2013) 1:2013) This European Standard was approved by CEN on 28 December 2012. Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards maybeobtained onapplicationtotheCEN-CENELEC ManagementCentreortoany CENmember. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation 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. Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Siovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. cen EUROPEANCOMMITTEEFOR STANDARDIZATION COMITEEUROPEENDENORMALISATION EUROPAISCHESKOMITEEFURNORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels @2013CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 4126-1:2013: E