【正文】 UROP201。ISCHE NORM ICS English version Nondestructive testing Leak testing Criteria for method and technique selection (includes amendment A1:2022) Essais non destructifs Contr244。233。it233。res de choix de la m233。rungsfreie Pr252。fung Kriterien zur Auswahl eines Pr252。lt 196。 Europ233。isches Komitee f252。 1999 All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1779:1999 + A1:2022 E Page 2 EN 1779:1999 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Definitions 4 4 Personnel qualification 4 5 Units 4 6 Tightness requirements 4 7 Leak testing 5 8 General principles of method and technique selection 9 Annex A (normative) Specific features of leak testing methods 12 Annex B (informative) Conversion factors for leakage rate units 18 Page 3 EN 1779:1999 Foreword This European Standard has been prepared by Technical Committee CEN/TC 138 Nondestructive testing, 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of an identical text or by endorsement, at the latest by February 2022, and conflicting national standards shall be withdrawn at the latest by February 2022. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. According to the CEN/CENELEC Internal Regulations, the national standards anizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Foreword to amendment A1 This document EN 1779:1999/A1:2022 has been prepared by Technical Committee CEN/TC 138 “Nondestructive testing”, the secretariat of which is held by AFNOR. This Amendment to the European Standard EN 1779:1999 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2022, and conflicting national standards shall be withdrawn at the latest by June 2022. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. According to the CEN/CENELEC Internal Regulations, the national standards anizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom. Page 4 EN 1779:1999 1 Scope This European Standard describes criteria for the selection of the most suitable method and technique for the assessment of leak tightness by indication or measurement of a gas leakage. Annex A, normative, allows a parison of standard test methods. Leak detection using hydrostatic tests, ultrasonic or electromagic methods is not included in this document. This standard can be used for equipment which can be evacuated or pressurized. 2 Normative references This standard incorporates by 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 standard only when incorporated in it by amendment or revision. For undated references the latest edition of the reference applies. EN 473 Qualification and certification of NDT personnel General principles EN 13308 Nondestructive testing Terminology Part 8: Terms used in leak tightness testing 3 Definitions For the purposes of this standard, the definitions given in EN 13308 apply. 4 Personnel qualification It is assumed that leak testing is performed by qualified and capable personnel. In order to prove this qualification, it is remended to certify the personnel in accordance with EN 473. 5 Units The leakage rate is defined as the pVthroughput of a specific fluid which passes through a leak under specific conditions and is expressed in Pascals cubic metre per second. In the past, the leakage rate was expressed in various units, these are given in informative Annex B. 6 Tightness requirements The leak tightness of an object is usually determined by measurement of its gas leakage rate. Leak tightness is monly described as the flow rate of fluid into or from the test object. For a gas, leak tightness may be conveniently indicated by the variation of pressure with time under specified conditions. For testing, however, . when drafting specifications and procedures, the leak tightness shall be expressed as leakage rate in units of gas throughput (Pa?m3/s) for a specific gas at specified temperature and at specified pressure conditions. Zero leakage rate shall not be specified. The required leak tightness shall be related to the function of the object under consideration. Page 5 EN 1779:1999 NOTE 1: Examples of relationship between leakage rate and the object: leakage rates in the order of 5 x 10 4 Pa?m3/s can be acceptable for pressed air cylinders (this corresponds to a pressure variation of 5000 Pa in a 10 l volume in 24 hours or 0,5 l loss measured at atmospheric pressure)。 the operating temperature. The suitability of the system for a given task is indicated by the functional tightness. NOTE 3 : To take into account factors that are unquantifia