SIST EN ISO 18081:2017
(Main)Non-destructive testing - Acoustic emission testing (AT) - Leak detection by means of acoustic emission (ISO 18081:2016)
Non-destructive testing - Acoustic emission testing (AT) - Leak detection by means of acoustic emission (ISO 18081:2016)
This European Standard specifies the general principles required for Leak Detection by the acoustic emission (AE) testing. The Standard is addressed to the application of the methodology on structures and components, where a leak flow as result of pressure differences appears and generates AE.
It describes phenomena of the AE generation and influence of the nature of fluids, shape of the gap, wave propagation and environment.
The different application methods, instrumentation and presentation of AE results will be discussed. It also includes the guidelines for the preparation of application documents, which describe specific requirements for the application of the AE method.
Different application examples will be given.
Unless otherwise specified in the referencing documents, the minimum requirements of this standard are applicable.
Zerstörungsfreie Prüfung - Schallemission - Dichtheitsprüfung mittels Schallemission (ISO 18081:2016)
Diese Europäische Norm legt die allgemeinen Grundlagen fest, die für die Dichtheitsprüfung mittels Schallemission (en: acoustic emission, AE) erforderlich sind. Die Norm behandelt die Anwendung der Technik bei Strukturen und Bauteilen, bei denen ein Leckagestrom aufgrund von Druckdifferenzen auftritt und Schall-emission hervorruft.
Sie beschreibt Phänomene der Entstehung von Schallemission und den Einfluss der Art des Fluid, der Spaltform, der Wellenausbreitung und der Umwelt.
Es werden verschiedene Anwendungsverfahren, Messgeräte und Darstellungen der Ergebnisse der Schallemission erörtert. Die Norm enthält außerdem die Richtlinien für die Erstellung der Anwendungs-dokumente, die spezielle Anforderungen an die Anwendung der Schallemissionsprüfung beschreiben.
Die Norm enthält verschiedene Anwendungsbeispiele.
Sofern in den in Bezug genommenen Dokumenten nichts anderes festgelegt ist, gelten die Mindest-anforderungen dieser Norm.
Essais non destructif - Émission acoustique - Détection de fuite par émission acoustique (ISO 18081:2016)
La présente Norme européenne définit les principes généraux exigés pour la détection de fuites au moyen de l'essai par émission acoustique (EA). Cette norme traite de l'application de la méthodologie sur les structures et les composants, lorsqu'un écoulement de fuite dû à des différences de pression se produit, et génère une EA.
Elle décrit les phénomènes de génération d'EA et l’impact de la nature des fluides, de la forme de l'espace, de la propagation des ondes et de l'environnement.
Les différentes méthodes d'application, l'instrumentation et la présentation des résultats de l'EA vont être décrites. La présente norme contient également les lignes directrices relatives à la préparation des documents d'application, qui décrivent les exigences spécifiques pour l'application de la méthode par EA.
Différents exemples d'application vont être donnés.
Sauf spécification contraire dans les documents de référence, les exigences minimales de la présente norme sont applicables.
Neporušitveno preskušanje - Akustična emisija - Preskušanje tesnosti z akustično emisijo (ISO 18081:2016)
Ta evropski standard določa splošna načela za preskušanje tesnosti z akustično emisijo (AE). Standard je namenjen uporabi metodologije pri konstrukcijah in komponentah, pri katerih pride do uhajanja zaradi tlačne razlike, kar povzroči akustično emisijo.
Opisuje nastanek akustične emisije in njen vpliv na naravo tekočine, obliko vrzeli, širjenje valov in okolje.
Obravnavane bodo različne metode uporabe, različni instrumenti in predstavitev rezultatov akustične emisije. Vključuje tudi smernice za pripravo dokumentov za uporabo, ki opisujejo posebne zahteve za uporabo metode akustične emisije.
Navedeni bodo različni primeri uporabe.
Minimalne zahteve tega standarda so veljavne, razen če je v referenčnih dokumentih drugače določeno.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-marec-2017
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Non-destructive testing - Acoustic emission testing (AT) - Leak detection by means of
acoustic emission (ISO 18081:2016)
Zerstörungsfreie Prüfung - Schallemission - Dichtheitsprüfung mittels Schallemission
(ISO 18081:2016)
Essais non destructif - Émission acoustique - Détection de fuite par émission acoustique
(ISO 18081:2016)
Ta slovenski standard je istoveten z: EN ISO 18081:2016
ICS:
17.140.99 Drugi standardi v zvezi z Other standards related to
akustiko acoustics
19.100 Neporušitveno preskušanje Non-destructive testing
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 18081
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2016
EUROPÄISCHE NORM
ICS 19.100
English Version
Non-destructive testing - Acoustic emission testing (AT) -
Leak detection by means of acoustic emission (ISO
18081:2016)
Essais non destructifs - Contrôle par émission Zerstörungsfreie Prüfung - Schallemissionsprüfung -
acoustique - Détection de fuites par émission Dichtheitsprüfung mittels Schallemission (ISO
acoustique (ISO 18081:2016) 18081:2016)
This European Standard was approved by CEN on 22 April 2016.
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 obtained 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-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, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 18081:2016 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 18081:2016) has been prepared by Technical Committee CEN/TC 138 “Non-
destructive testing” the secretariat of which is held by AFNOR, in collaboration with Technical
Committee ISO/TC 135 “Non-destructive testing”.
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 December 2016, and conflicting national standards
shall be withdrawn at the latest by December 2016.
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.
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,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 18081:2016 has been approved by CEN as EN ISO 18081:2016 without any modification.
INTERNATIONAL ISO
STANDARD 18081
First edition
2016-06-01
Non-destructive testing — Acoustic
emission testing (AT) — Leak
detection by means of acoustic
emission
Essais non destructifs — Contrôle par émission acoustique —
Détection de fuites par émission acoustique
Reference number
ISO 18081:2016(E)
©
ISO 2016
ISO 18081:2016(E)
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
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ii © ISO 2016 – All rights reserved
ISO 18081:2016(E)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Personnel qualification . 2
5 Principle of acoustic emission method . 2
5.1 The AE phenomenon. 2
5.2 Influence of different media and different phases . 3
5.3 Influence of pressure differences . 4
5.4 Influence of geometry of the leak path . 4
5.5 Influence of wave propagation . 4
6 Applications . 5
7 Instrumentation . 5
7.1 General requirements . 5
7.2 Sensors . 5
7.2.1 Typical frequency ranges (band widths) . 5
7.2.2 Mounting method . 6
7.2.3 Temperature range, wave guide . 6
7.2.4 Intrinsic safety . 6
7.2.5 Immersed sensors . 6
7.2.6 Integral electronics (amplifier, RMS converter, ASL converter, band pass). 6
7.3 Portable and non-portable AT instruments . 6
7.4 Single and multichannel AT equipment . 6
7.4.1 Single-channel systems . 6
7.4.2 Multi-channel systems . 6
7.5 Measuring features (RMS, ASL vs. hit or continuous AE vs. burst AE) . 7
7.6 Verification using artificial leak noise sources . 7
8 Test steps for leak detection . 7
8.1 Sensor application . 7
8.2 Measured features . . 8
8.3 Background noise . 8
8.3.1 Environmental noise . 8
8.3.2 Process noise . 8
8.4 Data acquisition . 8
9 Location procedures . 9
9.1 General considerations . 9
9.2 Single sensor location based on AE wave attenuation. 9
9.3 Multi-sensor location based on Δt values (linear, planar) . 9
9.3.1 Threshold level and peak level timing method. 9
9.3.2 Cross correlation method .10
9.4 Wave type and wave mode based location .11
10 Data presentation .11
10.1 Numerical data presentation (level-meter) .11
10.2 Parametric dependent function (e.g. pressure) .11
10.3 Frequency spectrum .12
11 Data interpretation .12
11.1 Leak validation .12
11.1.1 On-site (during test) and off-site (post analysis) .12
11.1.2 Correlation with pressure .
...
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