EN IS0 28921-2 EUROPEANSTANDARD NORME EUROPEENNE EUROPAISCHE NORM February 2017 ICS 23.060.01 Supersedes EN 12567:2000 English Version Industrial valves - Isolating valves for low-temperature applications - Part 2: Type testing (IS0 28921-2:2015) Robinetterie industrielle - Robinets d'isolement pour Industriearmaturen - Absperrventile fur die application a basses températures - Partie 2: Essais de Anwendung im Niedertemperaturbereich - Teil 2: type (IS0 28921-2:2015) Typprifung (IS0 28921-2:2015) This European Standard was approved by CEN on 10 January 2017. European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references member. This European Standard exists in three official versions (English, French, German). A version in any other language made by 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, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. cen EUROPEAN COMMITTEE FOR STANDARDIZATION COMITE EUROPEEN DE NORMALISATION EUROPAISCHES KOMITEE FUR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels @ 2017 CEN Ref. No. EN IS0 28921-2:2017 E All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. EN IS0 28921-2:2017 (E) European foreword The text of IS0 28921-2:2015 has been prepared by Technical Committee IS0/TC 153 “Valves" of the International Organization for Standardization (ISO) and has been taken over as EN IS0 28921-2:2017 by 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, either by publication of an identical text or by endorsement, at the latest by August 2017, and conflicting national standards shall be withdrawn at the latest by August 2017. Attention is drawn to the possibility 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 EN IS0 28921-1 and EN IS0 28921-2 supersede EN 12567:2000. 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, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of IS0 28921-2:2015 has been approved by CEN as EN IS0 28921-2:2017 without any modification. IS0 28921-2:2015(E) Contents Page Foreword iv 1 Scope 2 Normative references 3 Terms and definitions 4 Test conditions 2 4.1 Valve selection. 2 4.2 Testing criteria and selection of valve design 4.2.1 General 2 4.2.2 Representative valve design selection 4.2.3 Selection and qualification of sealing elements 4.3 Requirements for test valve, direction for installation and conditions. 4.4 Preparation for low temperature test. 3 4.4.1 General 3 4.4.2 Valve tests 3 4.4.3 Test equipment. 3 Low temperature testing requirements 5 4 5.1 Safety provisions 4 5.2 Cooling of the valve 4 5.3 Test gas .4 5.4 Equipment 5.4.1 General 4 5.4.2 Test equipment 6 5.4.3 Instruments calibration 6 6 Information to be supplied by the purchaser 6 Annex A (normative) Test procedure for type testing of valves at low temperature 7 Annex B (informative) Information to be supplied by the purchaser. ..13 Annex C (informative) Low-temperature type test record .14 Bibliography .18 @ IS0 2015 - All rights reserved iii IS