EN ISO 18081:2024
(Main)Non-destructive testing - Acoustic emission testing (AT) - Leak detection by means of acoustic emission (ISO 18081:2024)
Non-destructive testing - Acoustic emission testing (AT) - Leak detection by means of acoustic emission (ISO 18081:2024)
This document specifies the general principles required for leak detection by acoustic emission testing (AT). It is addressed to the application of the methodology on structures and components, where a leak flow as a result of pressure differences appears and generates acoustic emission (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 techniques, instrumentation and presentation of AE results are discussed. Also included are guidelines for the preparation of application documents which describe specific requirements for the application of the acoustic emission testing.
Annex A gives procedures for some leak-testing applications.
Zerstörungsfreie Prüfung - Schallemissionsprüfung - Dichtheitsprüfung mittels Schallemission (ISO 18081:2024)
Dieses Dokument legt die allgemeinen Grundlagen fest, die für die Dichtheitsprüfung mittels Schallemissionsprüfung (en: acoustic emission testing, AT) erforderlich sind. Es behandelt die Anwendung der Methodik auf Konstruktionen und Bauteile, bei denen ein Leckagestrom aufgrund von Druckdifferenzen auftritt und Schallemission (en: acoustic emission, AE) hervorruft.
Es beschreibt Phänomene der AE-Entstehung und den Einfluss der Art des Fluids, der Spaltform, der Wellenausbreitung und der Umgebung.
Die verschiedenen Anwendungstechniken, Prüfgeräte und Darstellungen der AT-Ergebnisse werden erörtert. Außerdem sind Leitlinien für die Erstellung der Anwendungsdokumente, die spezielle Anforderungen an die Anwendung der Schallemissionsprüfung beschreiben, enthalten.
Anhang A enthält Techniken für einige Anwendungen der Dichtheitsprüfung.
Essais non destructifs - Essais d’émission acoustique - Détection de fuites par émission acoustique (ISO 18081:2024)
Le présent document définit les principes généraux exigés pour la détection de fuites au moyen d’essais d’émission acoustique. Il 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 émission acoustique (EA).
Il décrit les phénomènes de génération d’EA et l’influence de la nature des fluides, de la forme de l’espace, de la propagation des ondes et de l’environnement.
Les différentes techniques d’application, l’instrumentation et la présentation des résultats de l’EA sont abordées. Le présent document contient également les lignes directrices relatives à la préparation des documents d’application, qui décrivent les exigences spécifiques pour l’application des essais d’émission acoustique.
L’Annexe A fournit des modes opératoires pour certaines applications de détection de fuites.
Neporušitvene preiskave - Akustična emisija - Preskušanje tesnosti z akustično emisijo (ISO 18081:2024)
Standard ISO 18081:2016 določa splošna načela za preskušanje tesnosti z akustično emisijo (AT). Obravnava uporabo metodologije pri konstrukcijah in komponentah, pri katerih pride do uhajanja zaradi tlačne razlike, kar povzroči akustično emisijo (AE).
Opisuje nastanek akustične emisije in njen vpliv na naravo tekočine, obliko vrzeli, širjenje valov in okolje.
Obravnavane so različne metode uporabe, različni instrumenti in predstavitev rezultatov akustične emisije. Vključene so tudi smernice za pripravo dokumentov za uporabo, ki opisujejo posebne zahteve za uporabo metode akustične emisije.
Navedeni so različni primeri uporabe.
Če v referenčnih dokumentih ni navedeno drugače, se uporabljajo minimalne zahteve tega mednarodnega standarda.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2024
Nadomešča:
SIST EN ISO 18081:2017
Neporušitvene preiskave - Akustična emisija - Preskušanje tesnosti z akustično
emisijo (ISO 18081:2024)
Non-destructive testing - Acoustic emission testing (AT) - Leak detection by means of
acoustic emission (ISO 18081:2024)
Zerstörungsfreie Prüfung - Schallemissionsprüfung - Dichtheitsprüfung mittels
Schallemission (ISO 18081:2024)
Essais non destructifs - Contrôle par émission acoustique - Détection de fuites par
émission acoustique (ISO 18081:2024)
Ta slovenski standard je istoveten z: EN ISO 18081:2024
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
July 2024
EUROPÄISCHE NORM
ICS 19.100 Supersedes EN ISO 18081:2016
English Version
Non-destructive testing - Acoustic emission testing (AT) -
Leak detection by means of acoustic emission (ISO
18081:2024)
Essais non destructifs - Essais d'émission acoustique - Zerstörungsfreie Prüfung - Schallemissionsprüfung -
Détection de fuites par émission acoustique (ISO Dichtheitsprüfung mittels Schallemission (ISO
18081:2024) 18081:2024)
This European Standard was approved by CEN on 28 June 2024.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 18081:2024 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 18081:2024) has been prepared by Technical Committee ISO/TC 135 "Non-
destructive testing" in collaboration with Technical Committee CEN/TC 138 “Non-destructive 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 January 2025, and conflicting national standards shall
be withdrawn at the latest by January 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 18081:2016.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 18081:2024 has been approved by CEN as EN ISO 18081:2024 without any modification.
International
Standard
ISO 18081
Second edition
Non-destructive testing — Acoustic
2024-07
emission testing (AT) — Leak
detection by means of acoustic
emission
Essais non destructifs — Essais d’émission acoustique —
Détection de fuites par émission acoustique
Reference number
ISO 18081:2024(en) © ISO 2024
ISO 18081:2024(en)
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
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Published in Switzerland
ii
ISO 18081:2024(en)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Qualification of test personnel . 2
5 Principle of acoustic emission testing . 2
5.1 The acoustic emission phenomenon .2
5.2 Influence of different media and different phases .2
5.3 Influence of pressure differences .3
5.4 Influence of geometry of the leak path .4
5.5 Influence of wave propagation .4
6 Applications . 5
7 Testing equipment . 5
7.1 General requirements .5
7.2 Sensors . .5
7.2.1 Typical frequency ranges (band widths) .5
7.2.2 Mounting technique .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 AE instruments .7
7.4 Single and multi-channel AT instruments .7
7.4.1 Single-channel instruments .7
7.4.2 Multi-channel instruments .7
7.5 Determination of features (RMS, ASL vs. hit or continuous AE vs. burst AE) .7
7.6 System verification using artificial leak noise sources .7
8 Test procedure for leak detection . 8
8.1 Mounting of sensors .8
8.2 Additional features to be determined .9
8.3 Background noise.9
8.3.1 General .9
8.3.2 Environmental noise .9
8.3.3 Process noise .9
8.4 Data acquisition .9
9 Location procedures . 10
9.1 General .10
9.2 Single-sensor location based on AE wave attenuation .10
9.3 Multi-sensor location based on Δt values (linear, planar) .11
9.3.1 Threshold level and peak level timing technique.11
9.3.2 Cross-correlation technique .11
10 Data presentation .12
10.1 Numerical data presentation (level meter) . 12
10.2 Parametric dependent function . 12
10.3 Frequency spectrum .
...
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