DIN EN 14584-2013 Non-destructive testing - Acoustic emission testing - Examination of metallic pressure equipment during proof testing - Planar location of AE sources German versi.pdf

1、July 2013 Translation by DIN-Sprachendienst.English price group 11No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 1

2、7.140.20; 77.040.20!%English version EN 14584:2013,English translation of DIN EN 14584:2013-07Zerstrungsfreie Prfung Schallemissionsprfung Prfung von metallischen Druckgerten whrend der Abnahmeprfung Planare Ortungvon Schallemissionsquellen;Englische Fassung EN 14584:2013,Englische bersetzung von DI

3、N EN 14584:2013-07Essais non destructifs mission acoustique Vrification des quipements mtalliques sous pression pendant lpreuve Localisation planaire des sources dEA;Version anglaise EN 14584:2013,Traduction anglaise de DIN EN 14584:2013-07SupersedesDIN EN 14584:2005-11www.beuth.deDocument comprises

4、 pagesIn case of doubt, the German-language original shall be considered authoritative.1906.13DIN EN 14584:2013-07 2 A comma is used as the decimal marker. National foreword This document (EN 14584:2013) has been prepared by Technical Committee CEN/TC 138 “Non-destructive testing” (Secretariat: AFNO

5、R, France). The responsible German body involved in its preparation was the Normenausschuss Materialprfung (Materials Testing Standards Committee), Working Committee NA 062-08-23 AA Ultraschallprfung. Amendments This standard differs from DIN EN 14584:2005-11 as follows: a) Subclauses 5.4 and 7.1.2

6、have been modified; b) in Table 1, the last two example values have been changed; c) in Subclause 7.2.2, a new sentence has been added after the 2nd paragraph; d) in Subclause 7.2.4, the last sentence has been replaced by a NOTE; e) in Subclause 8.1, item d) and a NOTE have been added; f) Table 2 ha

7、s been modified; g) a NOTE has been added after Table 3; h) Clause 9 “Test documentation” has been revised to include further information; i) Clause 10 “Test report” has been added; j) Figure A.1 has been improved. Previous editions DIN EN 14584: 2005-11 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE

8、NORM EN 14584 May 2013 ICS 17.140.20; 77.040.20 Supersedes EN 14584:2005English Version Non-destructive testing - Acoustic emission testing - Examination of metallic pressure equipment during proof testing - Planar location of AE sources Essais non destructifs - mission acoustique - Vrification des

9、quipements mtalliques sous pression pendant lpreuve - Localisation planaire des sources d EA Zerstrungsfreie Prfung - Schallemissionsprfung - Prfung von metallischen Druckgerten whrend der Abnahmeprfung - Planare Ortung von Schallemissionsquellen This European Standard was approved by CEN on 7 March

10、 2013. CEN members are bound to comply 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 obtain

11、ed on application to the CEN-CENELEC 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-

12、CENELEC Management 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,

13、Italy, Latvia, Lithuania, Luxembourg, 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 Marni

14、x 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14584:2013: EEN 14584:2013 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Qualification of personnel 4 5 Gen

15、eral 5 5.1 Initial considerations .5 5.2 Application of load.5 5.3 Sensors .5 5.4 Location 5 5.5 Preliminary information 6 5.6 Written instruction requirements .6 6 Instrumentation 7 7 Testing 7 7.1 Pre-test measurements .7 7.1.1 Wave propagation 7 7.1.2 Determination of maximum allowed sensor spaci

16、ng.8 7.2 Test steps 10 7.2.1 General guidelines 10 7.2.2 In situ verification . 10 7.2.3 Background noise. 10 7.2.4 Pressurisation . 11 8 Interpretation of results . 11 8.1 Grading criteria . 11 8.2 Real-time control. 12 8.3 AE source location cluster severity grading . 13 9 Test documentation 13 10

17、 Test report . 14 Annex A (normative) Procedure for the correction of peak amplitude with distance 15 DIN EN 14584:2013-07 EN 14584:2013 (E) 3 Foreword This document (EN 14584:2013) 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 November 2013, and conflicting national standards shall be withdrawn at the latest by November 2013. Attention is drawn to the possibility that

19、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 14584:2005. Changes from the previous edition include: Clause 1: Applicability. Clause 4: Qualificati

20、on of responsible test personnel AT2. Clause 8: Insertion of a further evaluation criteria about the occurrence of high energetic burst signals within a cluster. Annex A: Some clarifications for the recalculation according to the attenuation curve. According to the CEN-CENELEC Internal Regulations,

21、the national standards organisations 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, Lat

22、via, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN 14584:2013-07 EN 14584:2013 (E) 4 1 Scope This European Standard describes the method for conducting acoustic emission testing (AT)

23、 of metallic pressure equipment during acceptance pressure testing using a planar location method. This standard is applicable also for subsequent tests for requalification. General principles of Acoustic Emissions are described in EN 13554. The objectives of the AE testing are to provide 100 % volu

24、metric testing to define regions of the structure which are acoustically active with burst type AE, e.g. as a result of evolution of sub-critical discontinuities, thus increasing the reliability of the acceptance test. The test provides a reference map for comparison with results of future tests. 2

25、Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendme

26、nts) applies. EN 1330-1:1998, Non destructive testing Terminology Part 1: List of general terms EN 1330-2:1998, Non destructive testing Terminology Part 2: Terms common to the non-destructive testing methods EN 1330-9:2009, Non-destructive testing Terminology Part 9: Terms used in acoustic emission

27、testing EN 13477-1, Non-destructive testing Acoustic emission Equipment characterisation Part 1: Equipment description EN 13477-2, Non-destructive testing Acoustic emission Equipment characterisation Part 2: Verification of operating characteristic EN 13554:2011, Non-destructive testing Acoustic emi

28、ssion testing General principles EN ISO 9712:2012, Non-destructive testing Qualification and certification of NDT personnel (ISO 9712:2012) EN ISO/IEC 17025:2005, General requirements for the competence of testing and calibration laboratories (ISO/IEC 17025:2005) 3 Terms and definitions For the purp

29、oses of this document, the terms and definitions given in EN 1330-1:1998, EN 1330-2:1998 and EN 1330-9:2009 apply. 4 Qualification of personnel Testing shall be carried out by proficient, suitably trained and qualified personnel at minimum level 2 according to EN ISO 9712. To demonstrate appropriate

30、 qualification, it is recommended that personnel be certified according to EN ISO 9712 or an equivalent formalised system. Operating authorisation for a qualified person shall be issued by the employer in accordance with a written procedure. NDT operations, unless otherwise agreed, shall be authoris

31、ed by a competent and qualified NDT supervisory individual (Level 3 according to EN ISO 9712 or equivalent) approved by the employer. DIN EN 14584:2013-07 EN 14584:2013 (E) 5 NOTE For pressure equipment, see Directive 97/23/EC, Annex I 3.1.3: “For pressure equipment in categories III and IV, the per

32、sonnel must be approved by a third party organisation recognised by a Member State“. 5 General 5.1 Initial considerations The main target of the AE test is to detect, locate and monitor acoustic emission sources caused by phenomena generated by the applied load to the equipment, e.g. crack growth an

33、d yielding. The properties and structural state of the material, the type and magnitude of the applied stress and stress rate are significant factors affecting the emission. All relevant located AE sources shall be evaluated by other NDT methods. 5.2 Application of load The application of stress to

34、the equipment shall be made using internal pressure following the procedure specified in the relevant product standard. The rate of the application of pressure shall be limited to avoid burst signal overlap. The pressurising system shall permit pressurisation at a steady controllable rate and shall

35、allow the pressure to be held constant at the hold points. For pneumatic pressurisation, the pressurisation rate would not normally exceed 1 % of test pressure per minute, and for hydraulic loading, 5 % per minute. The intermediate hold periods, if necessary according to the AE activity or the pre-d

36、efined pressure schedule, will normally be 5 min to 10 min. The final hold period at the test pressure shall have a minimum duration of 15 min. Intermediate hold periods are strongly recommended, especially if pressurisation rates exceed 0,5 % per minute for pneumatic or 2 % per minute for hydraulic

37、 tests. Prior to starting the test, all the necessary actions shall be taken to identify and to reduce potential sources of extraneous noise. Dependent upon the results of the initial loading, a reduction of the load to working pressure or lower, followed by re-pressurisation, may be required. 5.3 S

38、ensors The most commonly used frequency range is 100 kHz to 300 kHz. Lower frequency monitoring allows detection at greater distances and higher frequency monitoring provides improved rejection of external noise. Selection of frequency range may optimise location accuracy by avoiding the detection o

39、f multiple wave modes. The equipment surface below the sensors shall be cleaned to ensure the maximum coupling efficiency. The sensor coupling shall be as specified in the written test instruction. The sensors may be directly attached to the structure using magnetic devices or an adhesive. The effec

40、tiveness and reliability of the acoustic coupling shall be verified. The characteristics of the type of the acoustic coupling used shall not affect the structure adversely. 5.4 Location The location of AE sources is performed using t measurement. The accuracy is normally within 5 % of the maximum us

41、ed sensor spacing (dmax,u) (see 7.1.2) and shall be measured and verified using an artificial source. The artificial source shall have an amplitude equivalent to the Hsu-Nielsen source minus the value of K. Alternatively a Hsu-Nielsen source may be used and the detection DIN EN 14584:2013-07 EN 1458

42、4:2013 (E) 6 threshold raised to the evaluation threshold during these location accuracy checks. If the accuracy is not within 5 %, appropriate action shall be taken. For difficult geometry, e.g. nozzles, manholes, reference measurements shall be made. 5.5 Preliminary information Prior to the test,

43、the AE Test Organisation shall collect the following information, as relevant: a) relevant product standard; b) type of equipment or structure specifications; c) assembly and/or layout drawings with sufficient details of the structure; d) material specifications, including heat treatment, if applica

44、ble; e) proposed pressure/stress application sequence; f) potential acoustic noise interference sources and the isolating mechanism applied; g) where possible, locations of known discontinuities and the general results of prior NDT. 5.6 Written instruction requirements The AE test organisation shall

45、 provide a written test instruction, which shall include but not necessarily be restricted to the following: a) explicit indication of the purpose of the test and limitations, if any; b) sensor type, frequency and manufacturer; c) method of sensor attachment; d) type of acoustic coupling used; e) ty

46、pe of surface preparation; f) type of AE equipment used with its main characteristics; g) energy measurement method to be used; h) value of K from relevant product standard, if available; i) sensor location maps representing the structure or part of it; j) description of equipment verification proce

47、dure; k) description of the in situ verification (see 7.2.2); l) pre-defined pressure schedule; m) recorded data and recording method; n) available on-line presentation of data; o) real-time evaluation criteria; DIN EN 14584:2013-07 EN 14584:2013 (E) 7 p) post analysis procedure with adopted filteri

48、ng technique, if used; q) final report requirements; r) qualification/certification of the personnel. The test instruction shall be prepared in accordance with EN ISO 9712:2012, Table D.1. 6 Instrumentation An AT system shall consist of sensors and equipment for signal conditioning and processing, a

49、nd for displaying and recording data according to EN 13477-1. The AT instrument shall be capable of measuring at least the following parameters on all channels: a) AE burst count; b) burst signal peak amplitude; c) burst signal duration; d) burst signal rise time; e) burst signal energy; f) arrival time (leading edge and/or peak); and on the external input: external parameters, such as pressure and/or other stress parameters. In order to allow a real-time control of the pressure equipment under test