prEN ISO 16828

Non-destructive testing - Ultrasonic testing - Time-of-flight diffraction technique for detection and sizing of discontinuities (ISO/DIS 16828:2024)

ISO 16828:2012 defines the general principles for the application of the time-of-flight diffraction (TOFD) technique for both detection and sizing of discontinuities in low alloyed carbon steel components. It can also be used for other types of materials, provided the application of the TOFD technique is performed with necessary consideration of geometry, acoustical properties of the materials, and the sensitivity of the examination.
Although it is applicable, in general terms, to discontinuities in materials and applications covered by ISO 16810, it contains references to the application on welds. This approach has been chosen for reasons of clarity as to the ultrasonic probe positions and directions of scanning.
Unless otherwise specified in the referencing documents, the minimum requirements of ISO 16828:2012 are applicable.
Unless explicitly stated otherwise, ISO 16828:2012 is applicable to the following product classes as defined in ISO 16811: a) class 1, without restrictions; b) classes 2 and 3, restrictions apply as stated in Clause 9.
The inspection of products of classes 4 and 5 requires special procedures. These are also addressed in Clause 9.
Techniques for the use of TOFD for weld inspection are described in ISO 10863.
The related acceptance criteria are given in ISO 15626.

Zerstörungsfreie Prüfung - Ultraschallprüfung - Beugungslaufzeittechnik zum Auffinden und Ausmessen von Inhomogenitäten (ISO/DIS 16828:2024)

Essais non destructifs - Contrôle par ultrasons - Technique de diffraction du temps de vol pour la détection et le dimensionnement des discontinuités (ISO/DIS 16828:2024)

L'ISO 16828:2012 définit les principes généraux pour l'application de la technique de diffraction du temps de vol (TOFD) pour la détection et le dimensionnement des discontinuités dans les composants en acier au carbone faiblement allié. Elle peut également être employée pour d'autres types de matériaux, à condition que l'application de la technique TOFD tienne compte de la géométrie, des propriétés acoustiques des matériaux et de la sensibilité de l'examen.
Bien qu'elle soit applicable, en termes génériques, aux discontinuités des matériaux et applications couvertes par l'ISO 16810, elle contient des références aux applications sur les soudures. Cette approche a été choisie pour des raisons de clarté en termes de position des traducteurs ultrasonores et de direction de balayage.
Sauf indications contraires dans les documents de référence, les exigences minimales de l'ISO 16828:2012 sont applicables.
Sauf dispositions contraires explicites, l'ISO 16828:2012 s'applique aux classes de produits suivantes, telles que définies dans l'ISO 16811: classe 1: sans restriction; classes 2 et 3: les restrictions spécifiées s'appliquent comme établi dans l'Article 9.
L'examen des produits de classes 4 et 5 requiert des modes opératoires particuliers, qui sont également traités dans l'Article 9.
Les techniques d'utilisation de la méthode TOFD pour l'examen des soudures sont décrites dans l'ISO 10863.
Les critères d'acceptation associés sont donnés dans l'ISO 15626.

Neporušitvene preiskave - Ultrazvočne preiskave - Metoda zvočne poti za odkrivanje in ocenjevanje velikosti nezveznosti (ISO/DIS 16828:2024)

General Information

• Status: Not Published
• Publication Date: 11-Jan-2026
• ICS: 19.100 - Non-destructive testing
• Technical Committee: CEN/TC 138 - Non-destructive testing
• Drafting Committee: CEN/TC 138/WG 2 - Ultrasonic testing
• Current Stage: 4060 - Closure of enquiry - Enquiry
• Start Date: 09-Sep-2024
• Completion Date: 09-Sep-2024
• Ref Project: oSIST prEN ISO 16828:2024 - Non-destructive testing - Ultrasonic testing - Time-of-flight diffraction technique for detection and sizing of discontinuities (ISO/DIS 16828:2024)

Relations

• Revises: EN ISO 16828:2014 - Non-destructive testing - Ultrasonic testing - Time-of-flight diffraction technique as a method for detection and sizing of discontinuities (ISO 16828:2012)
• Effective Date: 22-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2024
Neporušitvene preiskave - Ultrazvočne preiskave - Metoda zvočne poti za
odkrivanje in ocenjevanje velikosti nezveznosti (ISO/DIS 16828:2024)
Non-destructive testing - Ultrasonic testing - Time-of-flight diffraction technique for
detection and sizing of discontinuities (ISO/DIS 16828:2024)
Zerstörungsfreie Prüfung - Ultraschallprüfung - Beugungslaufzeittechnik zum Auffinden
und Ausmessen von Inhomogenitäten (ISO/DIS 16828:2024)
Essais non destructifs - Contrôle par ultrasons - Technique de diffraction du temps de vol
pour la détection et le dimensionnement des discontinuités (ISO/DIS 16828:2024)
Ta slovenski standard je istoveten z: prEN ISO 16828
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 16828
ISO/TC 135/SC 3
Non-destructive testing —
Secretariat: DIN
Ultrasonic testing — Time-of-flight
Voting begins on:
diffraction technique for detection
2024-06-17
and sizing of discontinuities
Voting terminates on:
ICS: 19.100
2024-09-09
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Reference number
ISO/DIS 16828:2024(en)
DRAFT
ISO/DIS 16828:2024(en)
International
Standard
ISO/DIS 16828
ISO/TC 135/SC 3
Non-destructive testing —
Secretariat: DIN
Ultrasonic testing — Time-of-flight
Voting begins on:
diffraction technique for detection
and sizing of discontinuities
Voting terminates on:
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
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BE CONSIDERED IN THE LIGHT OF THEIR
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Published in Switzerland Reference number
ISO/DIS 16828:2024(en)
ii
ISO/DIS 16828:2024(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Quantities, units and symbols . 2
5 General . 3
5.1 Principle of the technique .3
5.2 Requirements for surface condition and couplant .5
5.3 Materials and process type .5
6 Qualification of test personnel . 5
7 Requirements for test equipment. 6
7.1 General .6
7.2 Instrument and display .6
7.3 Probes .8
7.4 Scanning .8
8 TOFD setup procedures . 9
8.1 General .9
8.2 Probe selection and probe separation .9
8.2.1 Probe selection.9
8.2.2 Probe separation .10
8.3 Time window setting .10
8.4 Sensitivity setting .10
8.5 Scan increment setting .10
8.6 Setting of scanning speed .11
8.7 Checking of system performance.11
9 Interpretation and analysis of data .11
9.1 Basic analysis of discontinuities .11
9.1.1 General .11
9.1.2 Characterization of discontinuities .11
9.1.3 Estimation of discontinuity position . 12
9.1.4 Estimation of discontinuity length . 12
9.1.5 Estimation of discontinuity depth and height. 13
9.2 Detailed analysis of discontinuities .14
9.2.1 General .14
9.2.2 Additional scans .14
9.2.3 Additional algorithms . 15
10 Detection and sizing in complex geometries .15
11 Limitations of the TOFD technique .16
11.1 General .16
11.2 Accuracy and resolution .16
11.2.1 General .16
11.2.2 Inaccuracy in the lateral position.16
11.2.3 Timing inaccuracy .17
11.2.4 Inaccuracy in sound velocity .17
11.2.5 Inaccuracy in probe centre separation.17
11.2.6 Spatial resolution .17
11.3 Dead zones . .17
12 TOFD testing without data recording.18

iii
ISO/DIS 16828:2024(en)
13 Test procedure .18
14 Test report .18
Annex A (informative) Reference blocks .20
Bibliography .
...