FprEN ISO 18081

Non-destructive testing - Acoustic emission testing (AT) - Leak detection by means of acoustic emission (ISO/FDIS 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/FDIS 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 Technik 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 Anwendungen der Dichtheitsprüfung.

Essais non destructifs - Essais d’émission acoustique - Détection de fuites par émission acoustique (ISO/FDIS 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/FDIS 18081:2024)

General Information

• Status: Not Published
• Publication Date: 26-Aug-2024
• ICS: 19.100 - Non-destructive testing
• Technical Committee: CEN/TC 138 - Non-destructive testing
• Drafting Committee: CEN/TC 138/WG 7 - Acoustic emission testing
• Current Stage: 6055 - CEN Ratification completed (DOR) - Publishing
• Start Date: 28-Jun-2024
• Completion Date: 28-Jun-2024
• Ref Project: kSIST FprEN ISO 18081:2024 - Non-destructive testing - Acoustic emission testing (AT) - Leak detection by means of acoustic emission (ISO/FDIS 18081:2024)

Relations

• Revises: EN ISO 18081:2016 - Non-destructive testing - Acoustic emission testing (AT) - Leak detection by means of acoustic emission (ISO 18081:2016)
• Effective Date: 19-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN ISO 18081:2023
01-oktober-2023
Nadomešča:
SIST EN ISO 18081:2017
Neporušitveno preskušanje - Akustična emisija - Preskušanje tesnosti z akustično
emisijo (ISO/DIS 18081:2023)
Non-destructive testing - Acoustic emission testing (AT) - Leak detection by means of
acoustic emission (ISO/DIS 18081:2023)
Zerstörungsfreie Prüfung - Schallemissionsprüfung - Dichtheitsprüfung mittels
Schallemission (ISO/DIS 18081:2023)
Essais non destructifs - Contrôle par émission acoustique - Détection de fuites par
émission acoustique (ISO/DIS 18081:2023)
Ta slovenski standard je istoveten z: prEN ISO 18081
ICS:
17.140.99 Drugi standardi v zvezi z Other standards related to
akustiko acoustics
19.100 Neporušitveno preskušanje Non-destructive testing
oSIST prEN ISO 18081:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN ISO 18081:2023
oSIST prEN ISO 18081:2023
DRAFT INTERNATIONAL STANDARD
ISO/DIS 18081
ISO/TC 135/SC 9 Secretariat: SAC
Voting begins on: Voting terminates on:
2023-08-22 2023-11-14
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
ICS: 19.100
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
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POTENTIAL TO BECOME STANDARDS TO
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Reference number
NATIONAL REGULATIONS.
ISO/DIS 18081:2023(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2023

oSIST prEN ISO 18081:2023
ISO/DIS 18081:2023(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 18081
ISO/TC 135/SC 9 Secretariat: SAC
Voting begins on: Voting terminates on:

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
ICS: 19.100
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
© ISO 2023
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
NOT BE REFERRED TO AS AN INTERNATIONAL
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on STANDARD UNTIL PUBLISHED AS SUCH.
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
IN ADDITION TO THEIR EVALUATION AS
or ISO’s member body in the country of the requester. BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
ISO copyright office
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STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
CH-1214 Vernier, Geneva
POTENTIAL TO BECOME STANDARDS TO
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WHICH REFERENCE MAY BE MADE IN
Reference number
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NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 18081:2023(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
Published in Switzerland
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
ii
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2023

oSIST prEN ISO 18081:2023
ISO/DIS 18081:2023(E)
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 . 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 Test equipment .6
7.1 General requirements . 6
7.2 Sensors . . 6
7.2.1 Typical frequency ranges (band widths) . 6
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) . 7
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 . 8
8 Test procedure for leak detection .8
8.1 Mounting of sensors . 8
8.2 Additional determined features . 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 . 10
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 . 13
10.3 Frequency spectrum .13
11 Data interpretation .14
11.1 Leak validation . 14
11.1.1 On-site (during test) and off-site (post analysis) . 14
11.1.2 Correlation with pressure. 14
11.1.3 Rejection of false indications . 14
iii
oSIST prEN ISO 18081:2023
ISO/DIS 18081:2023(E)
11.2 Leakage rate estimation . 14
11.3 Demand for follow-up actions . 15
12 Quality management documents .15
12.1 Test procedure . 15
12.2 Test instruction . 15
13 Test documentation and reporting .16
13.1 Test documentation . . 16
13.2 Test report .
...