EN 17290:2021
(Main)Non-destructive testing - Ultrasonic testing - Examination for loss of thickness due to erosion and/or corrosion using the TOFD technique
Non-destructive testing - Ultrasonic testing - Examination for loss of thickness due to erosion and/or corrosion using the TOFD technique
This document specifies the application of the time-of-flight diffraction (TOFD) technique in testing of metals for quantifying loss of thickness due to erosion and/or corrosion.
This document applies to all types of corrosion and/or erosion damage, particularly those defined in EN ISO 16809.
This document applies to unalloyed or low-alloyed steels.
It applies to components with a nominal thickness ≥ 6 mm. For smaller thicknesses, feasibility tests are performed to validate the test technique.
For other materials, feasibility tests are essential, too.
The TOFD technique can be used as a stand-alone technique or in combination with other non-destructive testing techniques, for in-service testing, in order to detect material loss caused by erosion and/or corrosion.
This technique is based on analysis of TOFD images using reflected and/or diffracted ultrasonic signals.
This document does not specify acceptance levels.
Zerstörungsfreie Prüfung - Ultraschallprüfung - Prüfung für den Verlust der Dicke aufgrund von Erosion und/oder Korrosion unter Anwendung der Beugungslaufzeittechnik (TOFD)
Dieses Dokument legt die Anwendung der Beugungslaufzeittechnik (TOFD, en: time of flight diffraction) bei der Prüfung von Metallen zur Quantifizierung von Dickenverlusten durch Erosion und/oder Korrosion fest.
Dieses Dokument ist anzuwenden für alle Arten von Korrosions und/oder Erosionsschäden, insbesondere für die in EN ISO 16809 festgelegten.
Dieses Dokument ist anzuwenden für unlegierte oder niedrig legierte Stähle.
Sie ist anzuwenden für Bauteile mit einer Nenndicke von ≥ 6 mm. Für kleinere Dicken werden Machbarkeitsprüfungen durchgeführt, um die Prüftechnik zu bestätigen.
Auch für andere Werkstoffe sind Machbarkeitsprüfungen unerlässlich.
Die TOFD Technik kann als eigenständige Technik oder in Kombination mit anderen zerstörungsfreien Prüftechniken für betriebsbegleitende Prüfungen angewendet werden, um durch Erosion und/oder Korrosion verursachten Werkstoffverlust festzustellen.
Diese Technik basiert auf der Auswertung von TOFD Bildern unter Verwendung von reflektierten und/oder gebeugten Ultraschallsignalen.
Dieses Dokument legt keine Zulässigkeitsgrenzen fest.
Essais non destructifs - Contrôle par ultrasons - Examen de la perte d’épaisseur due à l’érosion et/ou à la corrosion par la technique TOFD
Le présent document spécifie l’application de la technique de diffraction du temps de vol (TOFD) pour le contrôle des métaux, afin de quantifier la perte d’épaisseur due à l’érosion et/ou à la corrosion.
Le présent document s’applique à tous les types d’endommagements par l’érosion et/ou par la corrosion, en particulier ceux définis dans l’EN ISO 16809.
Le présent document s’applique aux aciers non alliés ou faiblement alliés.
Il s’applique à tous les composants ayant une épaisseur nominale ≥ 6 mm. Pour les plus petites épaisseurs, des essais de faisabilité sont réalisés pour valider la technique.
Pour les autres matériaux, il est également indispensable de réaliser des essais de faisabilité.
La technique TOFD peut être utilisée de manière autonome ou en combinaison avec d’autres techniques d’essais non destructifs pour le contrôle en cours de service, afin de détecter la perte de matériau causée par l’érosion et/ou par la corrosion.
Cette technique repose sur l’analyse d’images TOFD représentant des signaux ultrasonores réfléchis et/ou diffractés.
Le présent document ne spécifie pas les niveaux d’acceptation.
Neporušitvene preiskave - Preskušanje z ultrazvokom - Preiskava za ugotavljanje izgube debeline zaradi erozije in/ali korozije z uporabo tehnike TOFD
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2021
Neporušitvene preiskave - Preskušanje z ultrazvokom - Preiskava za ugotavljanje
izgube debeline zaradi erozije in/ali korozije z uporabo tehnike TOFD
Non-destructive testing - Ultrasonic testing - Examination for loss of thickness due to
erosion and/or corrosion using the TOFD technique
Zerstörungsfreie Prüfung - Ultraschallprüfung - Prüfung für den Verlust der Dicke
aufgrund von Erosion und/oder Korrosion unter Anwendung der Beugungslaufzeittechnik
(TOFD)
Essais non destructifs - Contrôle par ultrasons - Examen de la perte d’épaisseur due à
l’érosion et/ou à la corrosion par la technique TOFD
Ta slovenski standard je istoveten z: EN 17290:2021
ICS:
19.100 Neporušitveno preskušanje Non-destructive testing
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 17290
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2021
EUROPÄISCHE NORM
ICS 19.100
English Version
Non-destructive testing - Ultrasonic testing - Examination
for loss of thickness due to erosion and/or corrosion using
the TOFD technique
Essais non destructifs - Contrôle par ultrasons - Zerstörungsfreie Prüfung - Ultraschallprüfung -
Examen de la perte d'épaisseur due à l'érosion et/ou à Prüfung für den Verlust der Dicke aufgrund von
la corrosion par la technique TOFD Erosion und/oder Korrosion unter Anwendung der
Beugungslaufzeittechnik (TOFD)
This European Standard was approved by CEN on 5 March 2021.
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, Turkey 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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17290:2021 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 5
4 General specifications . 5
4.1 General . 5
4.2 Limits of the test technique . 5
5 Qualification of personnel . 5
6 Test equipment . 5
6.1 Instrument . 5
6.2 Probes and TOFD set-up . 5
6.3 Encoder . 6
6.4 Combined equipment . 6
6.5 Reference blocks . 6
6.6 Couplant. 6
7 Application of the technique . 6
7.1 Surface condition . 6
7.2 Temperature . 6
7.3 Marking . 6
7.4 Selection of probes and PCS . 7
7.5 Instrument settings . 8
7.6 Testing . 9
8 Interpretation and analysis of TOFD images . 10
8.1 Validation of TOFD images . 10
8.2 Relevant indications . 10
8.3 Determination of dimensions and location . 11
9 Test report . 15
Annex A (informative) Example of a reference block . 17
Annex B (informative) Examples of typical TOFD images of loss of thickness due to erosion
and/or corrosion . 19
Bibliography . 22
European foreword
This document (EN 17290:2021) has been prepared by 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 April 2022, and conflicting national standards shall be
withdrawn at the latest by April 2022.
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.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations 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, Turkey and the
United Kingdom.
1 Scope
This document specifies the application of the time-of-flight diffraction (TOFD) technique in testing of
metals for quantifying loss of thickness due to erosion and/or corrosion.
This document applies to all types of corrosion and/or erosion damage, particularly those defined in
EN ISO 16809.
This document applies to unalloyed or low-alloyed steels.
It applies to components with a nominal thickness ≥ 6 mm. For smaller thicknesses, feasibility tests are
performed to validate the test technique.
For other materials, feasibility tests are essential, too.
The TOFD technique can be used as a stand-alone technique or in combination with other non-
destructive testing techniques, for in-service testing, in order to detect material loss caused by erosion
and/or corrosion.
This technique is based on analysis of TOFD images using reflected and/or diffracted ultrasonic signals.
This document does not specify acceptance levels.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 ISO 5577, Non-destructive testing — Ultrasonic testing — Vocabulary (ISO 5577)
EN ISO 9712, Non-destructive testing — Qualification and certification of NDT personnel (ISO 9712)
EN ISO 10863:2020, Non-destructive testing of welds — Ultrasonic testing — Use of time-of-flight
diffraction technique (TOFD) (ISO 10863:2020)
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)
EN ISO 17659, Welding — Multilingual terms for welded joints with illustrations (ISO 17659)
EN ISO 22232-1, Non-destructive testing — Characterization and verification of ultrasonic test equipment
— Part 1: Instruments (ISO 22232-1)
EN ISO 22232-2, Non-destructive testing — Characterization and verification of ultrasonic test equipment
— Part 2: Probes (ISO 22232-2)
EN ISO 22232-3, Non-destructive testing — Characterization and verification of ultrasonic test equipment
— Part 3: Combined equipment (ISO 22232-3)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 5577, EN ISO 10863 and
EN ISO 16828 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
4 General specifications
4.1 General
The TOFD technique can be applied for thickness measurement on the body of components e.g. plates
and pipes, and on welded joints.
Testing and determination of thickness shall be carried out from the side opposite to the
eroded/corroded surface.
4.2 Limits of the test technique
For testing pipes and components in service, the limits described in EN ISO 16828 apply. The presence
of internal discontinuities can hamper the testing for loss of wall thickness.
When applied on welded joints, special precautions shall be taken for the following situations:
a) misalignment;
b) tapering; and
c) weld on permanent support.
Feasibility tests on representative welds are recommended before using the TOFD technique.
5 Qualification of personnel
The personnel performing the testing and interpreting the results shall have corresponding training
and experience in the field of ultrasonic testing. Additionally, the personnel shall be qualified to
properly perform TOFD UT in accordance with the requirements in EN ISO 9712 or equivalent.
6 Test equipment
6.1 Instrument
The ultrasonic instrument used for testing shall comply with the requirements of EN ISO 22232-1.
6.2 Probes and TOFD set-up
The ultrasonic probes used for the TOFD technique shall comply with the requirements of
EN ISO 22232-2.
The selection of probe characteristics is covered in 7.4.
The maximum diffraction efficiency occurs when the included angle is about 120°. The probes should be
arranged such that the beam axes intersect at about this angle in the depth region to be tested.
Deviations of more than –35° or +45° from this value may cause the diffracted echoes to be weak and
should not be used unless detection capabilities can be demonstrated.
The probe support mechanism shall ensure constant probe centre separation (PCS) within ± 1 mm and
constant alignment between the index points.
6.3 Encoder
Information on the position shall be provided by an encoding system.
The encoding system shall be compatible with the acceptance levels specified for the spatial resolution.
6.4 Combined equipment
Any combined equipment (instrument, probes and cables) that is used shall comply with the
requirements of EN ISO 16828 and EN ISO 22232-3.
6.5 Reference blocks
The use of one or more reference blocks is recommended.
The reference block(s) should be
...
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