CEN/TR 14748:2004

SLOVENSKI STANDARD
01-januar-2005
Neporušitveno preskušanje – Metodologija za kvalifikacijo neporušitvenih
preskusov
Non-destructive testing - Methodology for qualification of non-destructive tests
Zerstörungsfreie Prüfung - Vorgehensweise zur Qualifizierung von zerstörungsfreien
Prüfungen
Essai non destructif - Méthodologie pour la qualification des méthodes d'essais non
destructifs
Ta slovenski standard je istoveten z: CEN/TR 14748:2004
ICS:
19.100 Neporušitveno preskušanje Non-destructive testing
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL REPORT
CEN/TR 14748
RAPPORT TECHNIQUE
TECHNISCHER BERICHT
October 2004
ICS 19.100
English version
Non-destructive testing - Methodology for qualification of non-
destructive tests
Essai non destructif - Méthodologie pour la qualification des Zerstörungsfreie Prüfung - Vorgehensweise zur
méthodes d'essais non destructifs Qualifizierung von zerstörungsfreien Prüfungen
This Technical Report was approved by CEN on 27 September 2004. It has been drawn up by the Technical Committee CEN/TC 138.
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, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TR 14748:2004: E
worldwide for CEN national Members.

Contents
Foreword.3
1 Scope .5
2 Normative references .6
3 Terms and definitions .6
4 General principles.8
5 Qualification phases, steps and responsibilities .8
Annex A (informative) Elements of NDT qualification process .14
A.1 Practical assessment .14
A.2 Technical justification .14
A.3 Qualification of NDT procedure.15
A.4 Training of NDT personnel.15
A.5 Qualification feedback .15
Annex B (informative) Input information to be made available prior to NDT qualification.16

Foreword
This document (CEN/TR 14748:2004) has been prepared by Technical Committee CEN/TC 138 “Non-destructive
testing”, the secretariat of which is held by AFNOR.

Introduction
Non–destructive tests (NDT) are typically one of a great number of activities within the quality assurance at
manufacture or during maintenance of industrial products, where the objective is to ensure a defined or agreed
product quality.
This is especially the case if the non-destructive tests are carried out according to standards or other accepted
technical codes.
Qualification of a non-destructive test may be necessary in the case of non standardised NDT or if the NDT does
not fully comply with the appropriate standard to ensure a defined or agreed product-quality. The objective of
qualification is to provide confidence in the non-destructive test itself and also in its continued performance. Non-
destructive tests, however, will not in themselves provide statements on product safety or on the lifetime of a
product.
Qualification should also be considered when there are reasons to provide additional assurance that the NDT can
meet the inspection requirements.
1 Scope
This document sets out basic principles and provides recommendations and general guidelines for carrying out
qualification of non-destructive tests.
The document deals with methods for qualifying non-destructive tests to determine whether they are capable of
attaining their objectives. It applies to all aspects of tests which influence their effectiveness.
The parties involved decide in their own responsibility on the need for a qualification of a non-destructive test. This
includes identification of the qualification-team and its technical competence.
There may be a need for qualification when there is a deviation from a European NDT Standard, or when new
techniques or methods are to be implemented for which there are no European Standards. Where there is a
European NDT Standard which applies, there is no need for qualification.
Table 1 summarises when qualification is required.
Table 1 — Need for qualification

A European Standard There is a deviation New technique
(EN) exists and
applies from EN
New method
↓ ↓ ↓
Qualification
No qualification dealing with the Qualification
deviation effect
This document is relevant to any non-destructive testing method and is therefore written in general terms, setting
out the principles that apply. It does not, in itself, constitute a specification for NDT qualification for a specific
component but is intended to be used as a basis for development of such specifications.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references,
only the edition cited applies. For undated references, the latest edition of the referenced document (including any
amendments) applies.
EN 473, Non-destructive testing - Qualification and certification of NDT personnel - General principles’
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
3.1
blind trial
trial in which those applying the non-destructive test to test pieces have no knowledge of the position of the
discontinuities in those test pieces (Type and orientation according to the NDT procedure)
3.2
essential parameters
parameters of the non-destructive tests, of the component and of the discontinuities that the test is intended to
detect or to size, which significantly affect the outcome of the test; the boundaries between which these parameters
can vary without significantly affecting the test are specified in the technical justification and/or NDT procedure as
appropriate
3.3
NDT equipment
means by which NDT is implemented. This includes both hardware and software
3.4
NDT method
discipline applying a physical principle in non-destructive testing (for example: eddy current test method)
3.5
NDT procedure
written description of how to apply a NDT technique to a specific test, including all essential parameters and
precautions to be observed. An NDT procedure can involve the application of more than one NDT method or
technique
3.6
NDT qualification
confirmation by examination and/or provision of objective evidence that the particular requirements for a specific
use of NDT are fulfilled. NDT qualification is one part of the whole qualification process
3.7
NDT system
all parts of the non-destructive test including equipment, NDT procedure and personnel, which can influence the
outcome and quality of the NDT
3.8
NDT technique
specific way in which the NDT method is utilised
NOTE For ultrasonic testing it may include, for example, pulse echo, tandem, TOFD, focused probes and so on, or the
combination of these which has been adopted.
3.9
open trial
trial in which those applying the non-destructive test to test pieces have specific knowledge of the discontinuities in
those test pieces
3.10
parties involved
parties involved are usually producer, supplier and/or purchaser who take responsibility for an industrial product
during manufacturing and/or service. In some cases, it may also include manufacturer, user, design department,
regulatory body, notified body, and/or third party body
3.11
physical reasoning
compilation of the detailed reasons for the selection of a particular non-destructive test
3.12
practical assessment
assessment of a non-destructive test by applying it to test pieces or to components containing natural defects
3.13
qualification dossier
assembly of all the information relevant to the qualification process
3.14
qualification process
process of demonstrating whether a specific NDT application is capable of fulfilling specific requirements
3.15
qualification programme
orderly list of actions to be carried out for the NDT qualification
3.16
qualification statement
document issued under the rules of a qualification system indicating that adequate confidence is provided that NDT
procedures, equipment and personnel or any combination of these are capable, for a specific test, of achieving the
stated objectives of the test
3.17
qualification team
person(s) that plan, conduct and accept NDT qualification, who are technically competent and acceptable to the
parties involved. The need for the qualification team to be separate from the parties involved is a matter to be
agreed by those involved
3.18
technical justification
collection of all the information which provides evidence about the capability of an NDT technique as applied to a
specific component
NOTE: It may include, for example, physical reasoning, mathematical modelling, results from test piece trials, field NDT results
or experimental studies as appropriate.
3.19
test piece
example or a simulation of the component for which the non-destructive test is to be qualified which will, as
appropriate, replicate size, geometry, material properties and defective condition(s) to be encountered on site.
4 General principles
Qualification of a non-destructive test may require assessment of an NDT system, composed of any combination of
NDT procedure, equipment and specific training of personnel.
This qualification consists of one of the following items:
a) practical assessment (blind or open trial) conducted on the component or simplified or representative test
pieces resembling the component to be inspected;
b) technical justification, which involves assembling all evidence on the effectiveness of the test including previous
experience of its application, experimental studies, mathematical modelling, physical reasoning etc;
c) appropriate mix of practical assessment and technical justification.
The appropriate mix of the above sources of evidence has to be judged separately for each particular case. The
use of technical justification should reduce practical assessment exercises. In some cases, it may be possible to
qualify NDT without any practical trials.
Further information on the concepts of practical assessment and technical justification is given in Annex A.
5 Qualification phases, steps and responsibilities
The qualification phases, steps and responsibilities, which may be taken to qualify NDT, are shown in Table 2. The
table also gives a reference to the relevant subclauses of this document that deal in more detail with each of the
steps. Within each of the five qualification phases, Table 2 does not necessarily indicate the order in which the
steps are taken.
Table 2: Qualification phases, steps and responsibilities
Phase Responsibility Reference
Step-N°
Phase 1: Prior to NDT qualification Subclause 5.1
Make available all required input information concerning 1 Parties involved subclause 5.1
component, relevant discontinuities, specific NDT

objectives
Define the NDT qualification objectives and which kind 2 Parties involved subclause 5.1
of results the qualification is aimed at

Define the field of application of the NDT qualification, 3 Parties involved subclause 5.1
e.g. oil industry, power industry, etc

Identify the qualification team 4 Parties involved subclause 5.1
Prepare the draft NDT procedure to be qualified, if 5 Parties involved, subclause 5.1
necessary qualification team as

Assemble the input data for the technical justification as appropriate
appropriate
Phase 2: Planning of NDT qualification Subclause 5.2
Prepare the qualification programme
6 Qualification team subclause 5.2
Agree on qualification programme
7 Parties involved, subclause 5.2
qualification team as
appropriate
Phase 3: Conducting NDT qualification Subclause 5.3
Conduct qualification programme
8 Qualification team subclause 5.3.1
Record the results and other additional information
9 Qualification team subclause 5.3.1.1
during qualification process
Evaluate the qualification results
10 Qualification team subclauses 5.3.1.2,
5.3.1.5, 5.3.1.8,
5.3.1.9
Compile NDT qualification dossier which has to discuss
11 Qualification team subclause 5.3.2
and to point out, whether the r
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