prEN ISO 16827

SLOVENSKI STANDARD
01-april-2024
Neporušitvene preiskave - Ultrazvočne preiskave - Karakterizacija in velikosti
nezveznosti (ISO/DIS 16827:2024)
Non-destructive testing - Ultrasonic testing - Characterization and sizing of discontinuities
(ISO/DIS 16827:2024)
Zerstörungsfreie Prüfung - Ultraschallprüfung - Beschreibung und Größenbestimmung
von Inhomogenitäten (ISO/DIS 16827:2024)
Essais non destructifs - Contrôle par ultrasons - Caractérisation et dimensionnement des
discontinuités (ISO/DIS 16827:2024)
Ta slovenski standard je istoveten z: prEN ISO 16827
ICS:
19.100 Neporušitveno preskušanje Non-destructive testing
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 16827
ISO/TC 135/SC 3
Non-destructive testing —
Secretariat: DIN
Ultrasonic testing —
Voting begins on:
Characterization and sizing of
2024-02-23
discontinuities
Voting terminates on:
2024-05-17
Essais non destructifs — Contrôle par ultrasons —
Caractérisation et dimensionnement des discontinuités
ICS: 19.100
THIS DOCUMENT IS A DRAFT CIRCULATED
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Reference number
ISO/DIS 16827:2024(en)
DRAFT
ISO/DIS 16827:2024(en)
International
Standard
ISO/DIS 16827
ISO/TC 135/SC 3
Non-destructive testing —
Secretariat: DIN
Ultrasonic testing —
Voting begins on:
Characterization and sizing of
discontinuities
Voting terminates on:
Essais non destructifs — Contrôle par ultrasons —
Caractérisation et dimensionnement des discontinuités
ICS: 19.100
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2024
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
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BE CONSIDERED IN THE LIGHT OF THEIR
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TO SUBMIT, WITH THEIR COMMENTS,
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Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 16827:2023(en)
ii
ISO/DIS 16827:2023(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principles of characterization of discontinuities . 1
4.1 General .1
4.2 Requirements for surface condition .2
5 Pulse-echo techniques . 2
5.1 General .2
5.2 Location of discontinuity .2
5.3 Orientation of discontinuity .3
5.4 Assessment of multiple indications .3
5.5 Shape of discontinuity .4
5.5.1 Simple classification .4
5.5.2 Detailed classification .5
5.6 Maximum echo height of indication .5
5.7 Size of discontinuity.5
5.7.1 General .5
5.7.2 Maximum echo height techniques .5
5.7.3 Probe movement sizing techniques .6
5.7.4 Selection of sizing techniques .8
5.7.5 Sizing techniques with focusing probes .8
5.7.6 Use of mathematical algorithms for sizing .8
5.7.7 Special sizing techniques .9
6 Through-transmission technique . 9
6.1 General .9
6.2 Location of discontinuity .9
6.3 Evaluation of multiple discontinuities .10
6.4 Reduction of signal amplitude .10
6.5 Sizing of discontinuity .11
Annex A (normative) Analysis of multiple indications .12
Annex B (normative) Techniques for the classification of discontinuity shape . 14
Annex C (informative) Sizing technique using the maximum echo height .23
Annex D (normative) Sizing techniques using probe movement .25
Annex E (normative) Iterative sizing technique .38
Annex F (normative) Mathematical algorithms for the estimation of the actual size of a
discontinuity .43
Annex G (informative) Examples of special sizing techniques .49
Bibliography .52

iii
ISO/DIS 16827:2023(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent
rights identified during the development of the document will be in the Introduction and/or on the ISO list of
patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 135, Non-destructive testing, Subcommittee
SC 3, Ultrasonic testing.
This second edition cancels and replaces the first edition (ISO 16827:2012), which has been technically
revised.
The main changes are as follows:
— figures have been updated,
— references have been updated,
— a hint has been added in the scope that the technique can also be used with phased array.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
ISO/DIS 16827:2023(en)
Introduction
The following documents are linked:
ISO 16810, Non-destructive testing — Ultrasonic testing — General principles
ISO 16811, Non-destructive testing — Ultrasonic testing — Sensitivity and range se
...