SIST EN 15495:2008

SLOVENSKI oSIST prEN 15495:2006

PREDSTANDARD
may 2006
Neporušitveno preskušanje – Akustična emisija – Preverjanje kovinske tlačne
opreme med preskušanjem – Območje namestitve senzorjev akustične emisije
Non destructive testing - Acoustic emission - Examination of metallic pressure
equipment during proof testing - Zone location of AE sources
ICS 17.140.01; 19.100 Referenčna številka
oSIST prEN 15495:2006(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

---------------------- Page: 1 ----------------------
EUROPEAN STANDARD
DRAFT
prEN 15495
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2006
ICS

English Version
Non Destructive testing - Acoustic emission - Examination of
metallic pressure equipment during proof testing - Zone location
of AE sources
Essais non destructifs - Émission acoustique - Vérification Zerstörungsfreie Prüfung - Schallemissionsprüfung -
des équipements métalliques sous pression pendant Prüfung von metallischen Druckgeräten während der
l'épreuve - Localisation par zone des sources d'EA Abnahmeprüfung - Zonenortung von
Schallemissionsquellen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 138.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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 are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 15495:2006: E
worldwide for CEN national Members.

---------------------- Page: 2 ----------------------
prEN 15495:2006 (E)
Contents Page
Foreword.3
1 Scope .4
2 Normative references .4
3 Definitions .4
4 Personnel Qualifications.5
5 General.5
5.1 Application of load.5
5.2 Sensors.5
5.3 Zone location.6
5.4 Preliminary information .6
5.5 Written instruction requirements.6
6 Instrumentation.7
7 Testing .8
7.1 Pre-Test Measurements .8
7.1.1 Wave propagation.8
7.1.2 Determination of maximum allowed sensor spacing.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 Equipment Pressurisation .10
8 Interpretation of results .11
8.1 Test stop criteria.11
8.1.1 Test stop during the initial proof loading.11
8.1.2 Test stop during subsequent loadings .11
8.2 AE zone grading criteria .12
9 Documentation.13

2

---------------------- Page: 3 ----------------------
prEN 15495:2006 (E)
Foreword
This document (prEN 15495:2006) has been prepared by Technical Committee CEN/TC 138 “Non-destructive
testing”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
3

---------------------- Page: 4 ----------------------
prEN 15495:2006 (E)
1 Scope

The purpose of this standard is to describe the methods for conducting acoustic emission (AE) examination of
metallic pressure equipment during acceptance pressure testing using a zone location procedure. General
principles of Acoustic Emissions are described in EN 13554.
The objectives of the AE testing are to provide 100% volumetric testing to define and grade zones of the structure
which are acoustically active with burst type AE. The method should be regarded as supplementary to planar
location. Planar location provides the source identification and characterisation. Zone location may also be applied
in such cases where location of AE sources by planar location procedures according to EN 14584 is not possible.
The method identifies the need for further evaluation of follow-up by other NDT in localized zones.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications.
These normative references are cited at the appropriate places 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 its amendment or revision. For undated references the
version valid at the time of publication of the standard containing the reference shall be used.
EN 1330-1, Non-destructive testing – Terminology – Part 1: General terms
EN 1330-2, Non-destructive testing – Terminology – Part 2: Terms common to the non-destructive
testing methods
EN 1330-9, Non-destructive testing – Terminology – Part 9: Terms used in Acoustic Emission 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 characteristics
EN 13554, Non-destructive testing - Acoustic emission - General principles
EN 14584, Non-destructive testing - Acoustic emission – Examination of metallic pressure equipment during
proof testing – Planar location of AE sources….
EN 473, Non-destructive testing - Qualification and certification of NDT personnel - General principles
EN ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories
3 Definitions
For the purpose of this European Standard, the terms and definitions given in EN 1330-1, EN 1330-2 and EN
1330-9 shall apply.


4

---------------------- Page: 5 ----------------------
prEN 15495:2006 (E)
4 Personnel Qualifications

It is assumed that acoustic emission testing is performed by qualified and capable personnel. In order to prove
this qualification, it is recommended to certify the personnel in accordance with EN 473.
NOTE For pressure equipment see directive 97/23/EC, annex 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 General
The main target of the AE test is to identify and monitor zones of high acoustic emission activity and intensity
caused by phenomena e.g. crack growth and yielding generated by the applied load to the equipment.
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 zones showing significant activity shall be completely evaluated by other NDT methods. Evaluation
according to EN 14584 may help to reduce the area to inspect.
5.1 Application of load
The application of the load to 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 established so as
to avoid burst signal overlap. The pressurising system shall permit pressurisation at a steady controllable rate
and shall allow the pressure to be held constant at the hold points. The pressurisation rate would not normally
exceed 1% of test pressure per minute for pneumatic and 5% of the test pressure per minute for hydraulic test.
The intermediate hold periods, if necessary according the AE activity or the pre-defined pressure schedule,
will normally are 5 min to 10 min. The final hold period at the test pressure shall have a minimum duration of
15 min.

NOTE Intermediate hold periods are strongly recommended, especially if pressurisation rates exceed 0.5 % per
minute for pneumatic or 2 % per minute for hydraulic 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.
5.2 Sensors
The frequency range shall be chosen so that the expected AE has sufficient energy in the chosen frequency
range and the test result is unaffected by external noise sources. The most commonly used frequency range
is 100 kHz to 300 kHz. Lower frequency monitoring allows detection at greater distances and high frequency
monitoring provides improved rejection of external noise.
The equipment surface below the sensors shall be prepared to ensure the maximum coupling efficiency. The
sensor couplant shall be as specified in the written test instruction. The sensors may be directly attached to
the structure using magnetic devices or suitable adhesive.
...