1、BRITISH STANDARD BS EN 13185:2001 Incorporating Amendment No. 1 Non-destructive testing Leak testing Tracer gas method The European Standard EN 13185:2001, with the incorporation of amendment A1:2003 has the status of a British Standard ICS 19.100 BS EN 13185:2001 This British Standard, having been
2、prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 May 2001 BSI 5 February 2004 ISBN 0 580 37216 2 National foreword This British Standard is the official English language version of EN 13185:2001
3、, including amendment A1:2003. Together with BS EN 13184:2001 it supersedes BS 3636:1963 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee WEE/46, Non-destructive testing, which has the responsibility to: A list of organizations represented on this comm
4、ittee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” faci
5、lity of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligation
6、s. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This docume
7、nt comprises a front cover, an inside front cover, the EN title page, pages 2 to 18, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments 14965 5 February 2004
8、Revision to Foreword page and deletion of Annex ZA EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13185 March 2001 + A1 December 2003 ICS 19.100 English version Non-destructive testing Leak testing Tracer gas method (includes amendment A1:2003) Essais non destructifs Contrle dtanchit Mthode pa
9、r gaz traceur (inclut lamendement A1:2003) Zerstrungsfreie Prfung Dichtheitsprfung Prfgasverfahren (enthlt nderung A1:2003) This European Standard was approved by CEN on 18 January 2001, and amendment A1 was approved by CEN on 20 November 2003. CEN members are bound to comply with the CEN/CENELEC In
10、ternal 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 Management Centre or to any CEN membe
11、r. 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 Management Centre has the same status as the official versions. CEN members ar
12、e the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EU
13、ROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2001 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13185:2001 + A1:2003 EPage 2 EN 13185:2001 Contents Page Foreword 3 1
14、 Scope.4 2 Normative references.4 3 Terms and definitions 4 4 Personnel qualification 4 5 Principles of detection .4 6 Generation and detection of tracer gas flow .5 6.1 Tracer gas flows into the object (Group A techniques)5 6.2 Tracer gas flows out of the object (Group B techniques) 5 7 Apparatus s
15、ee prEN 13625:2001 5 8 Object preparation6 9 Group A techniques, tracer gas flowing into the object.6 9.1 Initial system set up procedure.6 9.2 Vacuum technique (total) test procedure (A.1) .7 9.3 Vacuum technique (partial) test procedure (A.2) 8 9.4 Vacuum technique (local) test procedure (A.3).8 1
16、0 Group B techniques, tracer gas flowing out of object9 10.1 Initial system set up procedure.9 10.2 Ammonia test procedure (B.1) .10 10.3 Vacuum box test procedure (B.2.1, B.2.2)12 10.4 Accumulation technique procedures (B.3, B.6) 12 10.5 Sniffing test (B.4) 14 10.6 Pressure evacuation procedure ( B
17、.5)15 11 Test report.17 Annex A (informative) Accumulation technique calibration leak connected to enclosure of unknown volume 18 Page 3 EN 13185:2001 Foreword This European Standard has been prepared by Technical Committee CEN/TC 138, Non-destructive testing, the Secretariat of which is held by AFN
18、OR. 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 September 2001, and conflicting national standards shall be withdrawn at the latest by September 2001. This document has been prepared under a m
19、andate given to CEN by the European Commission and the European Free Trade Association. Annex A is informative. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Re
20、public, 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 13185:2001/A1:2003 has been prepared by Technical Committee CEN/TC 138 “Non-destructive
21、testing”, the secretariat of which is held by AFNOR. This Amendment to the European Standard EN 13185:2001 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2004, and conflicting national standards shall be withdrawn
22、 at the latest by June 2004. 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 organizations of the following countries are bound to implement this
23、 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 13185:2001 1 Scope This standard describes the t
24、echniques to be applied for the detection of a leak, using a tracer gas and a tracer gas specific leak detector. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate place
25、s 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 European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referr
26、ed to applies (including amendments). EN 473, Qualification and certification of NDT personnel General principles. EN 1330-8, Non-destructive testing Terminology Part 8: Terms used in leak tightness testing. EN 1779, Non-destructive testing Leak testing Criteria for method and technique selection. p
27、rEN 13192:2001, Non-destructive testing Leak test Calibration of gaseous reference leaks. prEN 13625:2001, Non-destructive testing Leak test Guide to the selection of instrumentation for the measurement of gas leakage. 3 Terms and definitions For the purposes of this European Standard, the terms and
28、 definitions given in EN 1330-8 apply. 4 Personnel qualification It is assumed that leak testing is performed by qualified and capable personnel. In order to provide this qualification, it is recommended to certify the personnel in accordance with EN 473 or equivalent. NOTE For pressure equipment se
29、e directive 97/23/EC (Annex I, paragraph 3.1.3): “For pressure equipment in categories III and IV, the personnel must be approved by a third party organization recognized by a Member State”. 5 Principles of detection A partial pressure difference of tracer gas is created across the boundary of the o
30、bject to be tested. The tracer gas, having passed through the leak, is revealed by its physical or chemical properties. Chemical detection is generally based on reactions that cause a local colour change (the object surface shall therefore be visible). Detection based on physical properties usually
31、involves a sensor, for example: a mass spectrometer, tuned for the specific tracer gas used (generally helium-4); an alkali ion diode, for halogen gas, and electron-capture equipment (i.e. for SF 6 ); a Pirani gauge, for tracer gas with thermal conductivity different from that of the ambient atmosph
32、ere; a photometer, with band-pass filter in the frequency range of the tracer gas absorption or emission. Page 5 EN 13185:2001 These types of detection generally give an electrical signal which varies with the tracer gas partial pressure. 6 Generation and detection of tracer gas flow Two basic techn
33、iques are used, see EN 1779. 6.1 Tracer gas flows into the object (Group A techniques) A pressure difference across the wall is obtained either by evacuation of the object, e.g. through a connection or by placing it in a pressurized chamber. Usually the test object is evacuated. Tracer gas is then a
34、pplied to the external surface using a probe jet or by enclosing the object (totally or partially) in a hood or chamber filled with the tracer gas. Tracer gas leakage into the test object is detected by a sensor within or connected to the internal volume. 6.2 Tracer gas flows out of the object (Grou
35、p B techniques) The object is filled with a tracer gas. A pressure difference across the wall is obtained either by pressurization of the object, e.g. through a connection or by placing it in a vacuum chamber. The tracer gas is collected on the outside surface by a sampling probe or by accumulation
36、into a hood or chamber. Tracer gas can also be detected by chemical reactions. A special technique (bombing) may also be used. This involves pressurization of a sealed object to force tracer gas into its internal cavities, if a leak exists. The object is then placed in a vacuum chamber and escaping
37、tracer gas is detected (usually this procedure is used only with helium-4). This method is applicable to specimens with small free internal volumes (in the order of a few cubic centimetres). 7 Apparatus see prEN 13625:2001 The test apparatus can include part or all of the following: 7.1 Leak detecto
38、r or chemical reagents able to detect the selected tracer gas. 7.2 Calibration leaks, calibrated for discharge into vacuum and/or against atmospheric pressure; refer to prEN 13192:2001. 7.3 Pressure and temperature gauges 7.4 Tracer gas or certified gas mixture. 7.5 Auxiliary vacuum systems 7.6 Hood
39、, vacuum or pressurizing chamber, jet or sampling probe. 7.7 Purging dry gas, liquid nitrogen (for cold trap), if necessary. 7.8 Equipment for tracer gas treatment-recovery. 7.9 Equipment for test area ventilation. 7.10 Data recording equipment. Page 6 EN 13185:2001 8 Object preparation The object t
40、o be tested shall be adequately cleaned, degreased and dried. Openings and apertures which are not involved in the test must be closed with test seals, e.g. plugs, welding, suitable material and gaskets. Whenever possible, testing should be carried before plating, painting or the application of ultr
41、asonic couplant. If the object has to be evacuated, the presence of porous or plastic materials should be avoided. This helps to avoid spurious indications (virtual leaks), and shortens the clean-up time. The connections between the object, the pumping system, the leak detector (LD) and the calibrat
42、ion leaks used shall be suitable and checked for tightness. 9 Group A techniques, tracer gas flowing into the object. These techniques are applicable to an object that can be evacuated or withstand an external test pressure. The tracer gas is applied on the outer surface of the object and the LD is
43、connected to the internal volume. If the LD is of Mass Spectrometer type (MLSD), the pumping system of the MSLD itself can be used to evacuate directly small items under test. Larger objects need an auxiliary pumping system. In this case, the loss of sensitivity shall be considered, as only part of
44、the tracer gas will enter the LD. Three techniques may be used refer to EN 1779: - Vacuum technique (Total) A.1 The object, placed in an enclosure (a bag or a chamber), is evacuated and connected to the detector. The enclosure is then filled with the tracer gas or a gas mixture containing the tracer
45、 gas. This technique allows the evaluation of the leakage rate but does not permit precise location of the leaks. When the purpose of the leak testing is the determination of the acceptability of the test object against a specified leakage rate, only the integral technique shall be used. In this cas
46、e, the tracer gas concentration, pressure and temperature shall be measured and the homogeneity of the gas mixture shall be ensured. Further the enclosure shall be gas-tight and, preferably, rigid. - Vacuum technique (Partial) A.2 The object to be tested is evacuated and connected to the detector. S
47、uspect areas are then covered by a suitable gas-tight enclosure filled with tracer gas. - Vacuum technique (Local) A.3 The object to be tested is evacuated and connected to the detector. Suspect areas on the external surface of the object are sprayed with tracer gas. Leaks can be localized using thi
48、s technique but it is not possible to measure the total leakage rate. 9.1 Initial system set up procedure 9.1.1 The LD shall be adjusted in accordance with manufacturers instructions, using a calibration leak (if required the leak shall be “standard”). If an MSLD is used, a leak for discharge to vac
49、uum has to be connected directly to the inlet of the LD, or the built-in leak for the calibration is to be used. 9.1.2 The object is connected to the LD and then evacuated to a suitable pressure, either by LD pumping system or by an auxiliary pumping system. This is determined by the maximum inlet pressure of the LD. 9.1.3 The initial background signal shall be measured. 9.1.4 The maximum signal for the specified calibration leak connecte
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