SIST EN ISO 16809:2025

SLOVENSKI STANDARD
01-oktober-2025
Neporušitvene preiskave - Ultrazvočno merjenje debeline (ISO 16809:2025)
Non-destructive testing - Ultrasonic thickness determination (ISO 16809:2025)
Zerstörungsfreie Prüfung - Dickenbestimmung mit Ultraschall (ISO 16809:202)
Essais non destructifs - Détermination de l'épaisseur par ultrasons (ISO 16809:2025)
Ta slovenski standard je istoveten z: EN ISO 16809:2025
ICS:
19.100 Neporušitveno preskušanje Non-destructive testing
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 16809
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2025
EUROPÄISCHE NORM
ICS 19.100 Supersedes EN ISO 16809:2019
English Version
Non-destructive testing - Ultrasonic thickness
determination (ISO 16809:2025)
Essais non destructifs - Détermination de l'épaisseur Zerstörungsfreie Prüfung - Dickenbestimmung mit
par ultrasons (ISO 16809:2025) Ultraschall (ISO 16809:2025)
This European Standard was approved by CEN on 14 June 2025.

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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 16809:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 16809:2025) 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 December 2025, and conflicting national standards
shall be withdrawn at the latest by December 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 16809:2019.
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 16809:2025 has been approved by CEN as EN ISO 16809:2025 without any modification.

International
Standard
ISO 16809
Third edition
Non-destructive testing —
2025-06
Ultrasonic thickness determination
Essais non destructifs — Détermination de l'épaisseur par
ultrasons
Reference number
ISO 16809:2025(en) © ISO 2025
ISO 16809:2025(en)
© ISO 2025
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 16809:2025(en)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Modes of determination . 1
5 General requirements . 3
5.1 Ultrasonic instruments .3
5.2 Probes .3
5.3 Couplant .3
5.4 Reference blocks .4
5.5 Test objects .4
5.6 Qualification of test personnel .4
6 Application of the techniques. 4
6.1 Surface condition and surface preparation .4
6.2 Technique .5
6.2.1 General .5
6.2.2 Determination during manufacture .5
6.2.3 Determination of residual wall thickness in service .6
6.3 Selection of probe.6
6.4 Selection of ultrasonic instrument .7
6.5 Special test conditions .7
6.5.1 General .7
6.5.2 Materials different from the material of the reference block.7
6.5.3 Determination at temperatures below 0 °C .7
6.5.4 Determination at elevated temperatures .8
6.5.5 Hazardous atmospheres .8
7 Instrument setting . 8
7.1 General .8
7.2 Methods of setting .8
7.2.1 General .8
7.2.2 Ultrasonic instruments with numerical display .9
7.2.3 Ultrasonic instruments with A-scan presentation .9
7.3 Checks of settings .10
8 Influence on accuracy .11
8.1 Operational conditions .11
8.1.1 Surface conditions .11
8.1.2 Temperature of the test object .11
8.1.3 Metallic coating .11
8.1.4 Non-metallic coating . 12
8.1.5 Geometry . 13
8.1.6 Material homogeneity . 13
8.2 Test equipment .14
8.2.1 Resolution .14
8.2.2 Range .14
8.3 Evaluation of accuracy.
...