oSIST prEN 17290:2018
(Main)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 or erosion damage, particularly those defined in ISO 16809.
This test applies to unalloyed or low-alloyed steel materials.
It applies to components with a nominal thickness ≥ 6 mm. For smaller thicknesses feasibility tests will be performed to validate the technique.
For other materials, feasibility tests are essential too.
The TOFD technique can be used here as a stand-alone technique or in combination with other non-destructive testing techniques, during manufacturing and for testing in-service, in order to detect material loss caused by erosion and/or corrosion.
This technique is based on analysis of TOFD images established 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 (en: time of flight diffraction, TOFD) bei der Prüfung von Metallen zur Quantifizierung von Dickenverlusten durch Erosion und/oder Korrosion fest.
Dieses Dokument gilt für alle Arten von Korrosions- oder Erosionsschäden, insbesondere für die in ISO 16809 festgelegten.
Diese Prüfung gilt für unlegierte oder niedrig legierte Stahlwerkstoffe.
Sie gilt für Bauteile mit einer Nenndicke von ≥ 6 mm. Für kleinere Dicken werden Machbarkeitsprüfungen durchgeführt, um die Technik zu bestätigen.
Auch für andere Werkstoffe sind Machbarkeitsprüfungen unerlässlich.
Die TOFD-Technik kann hier als eigenständige Technik oder in Kombination mit anderen zerstörungsfreien Prüftechniken verwendet werden, während der Herstellung oder für die betriebsbegleitende Prüfung, um durch Erosion und/oder Korrosion verursachten Werkstoffverlust festzustellen.
Diese Technik basiert auf der Auswertung von TOFD Bildern, die mit reflektierten und/oder gebeugten Ultraschallsignalen erstellt wurden.
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 la corrosion ou par l’érosion, en particulier ceux définis dans l’ISO 16809.
Ce contrôle s’applique aux matériaux en acier non allié ou faiblement allié.
Il s’applique à tous les composants ayant une épaisseur nominale ≥ 6 mm. Pour les plus petites épaisseurs, des essais de faisabilité seront 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 ici de manière autonome ou en combinaison avec d’autres techniques d’essais non destructifs, lors de la fabrication et 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 établies à l’aide de 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)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Neporušitveno preskušanje - Preskušanje z ultrazvokom - Preiskava za ugotavljanje izgube debeline zaradi erozije in/ali korozije z uporabo tehnike TOFDZerstörungsfreie 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 TOFDNon-destructive testing - Ultrasonic testing - Examination for loss of thickness due to erosion and/or corrosion using the TOFD technique19.100Neporušitveno preskušanjeNon-destructive testingICS:Ta slovenski standard je istoveten z:prEN 17290oSIST prEN 17290:2018en,fr,de01-november-2018oSIST prEN 17290:2018SLOVENSKI
STANDARDoSIST prEN 17290:2018
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
DRAFT prEN 17290
September
t r s z ICS
s {ä s r r English Version
Nonædestructive testing æ Ultrasonic testing æ Examination for loss of thickness due to ethe TOFD technique Essais non destructifs æ Contrôle par ultrasons æ la corrosion par la technique TOFD
Zerstörungsfreie Prüfung æ Ultraschallprüfung æ Prüfung für den Verlust der Dicke aufgrund von This draft European Standard is submitted to CEN members for enquiryä It has been drawn up by the Technical Committee
If this draft becomes a European Standardá CEN members are bounwhich stipulate the conditions for giving this European Standard the status of a national standard without any alterationä
This draft European Standard was established by CEN in three ofer language made by translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
Recipients of this draft are invited to submitá with their commentsá notification of any relevant patent rights of which they are aware and to provide supporting documentationä
Warning ã This document is not a European Standardä It is distributed for review and commentsä It is subject to change without notice and shall not be referred to as a European Standardä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:Rue de la Science 23,
B-1040 Brussels
t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä prEN
s y t { rã t r s z EoSIST prEN 17290:2018prEN 17290:2018 (E) 2 Contents Page European foreword ....................................................................................................................................................... 4 1 Scope .................................................................................................................................................................... 5 2 Normative references .................................................................................................................................... 5 3 Terms and definitions ................................................................................................................................... 6 4 General specifications ................................................................................................................................... 6 4.1 General ................................................................................................................................................................ 6 4.2 Limits of the technique .................................................................................................................................. 6 5 Test equipment ................................................................................................................................................ 6 5.1 Instrument ......................................................................................................................................................... 6 5.2 Probes and TOFD set-up ............................................................................................................................... 6 5.3 Encoder ............................................................................................................................................................... 6 5.4 Combined equipment .................................................................................................................................... 7 5.5 Reference blocks ............................................................................................................................................. 7 5.6 Couplant.............................................................................................................................................................. 7 6 Application of the technique ....................................................................................................................... 7 6.1 Surface condition ............................................................................................................................................ 7 6.2 Temperature ..................................................................................................................................................... 7 6.3 Marking ............................................................................................................................................................... 7 6.4 Selection of probes and PCS ........................................................................................................................ 7 6.5 Instrument settings ........................................................................................................................................ 8 6.5.1 Time window .................................................................................................................................................... 8 6.5.2 Time-to-depth conversion ........................................................................................................................... 9 6.5.3 Sensitivity setting ............................................................................................................................................ 9 6.5.4 Checking of the combined equipment ..................................................................................................... 9 6.6 Testing .............................................................................................................................................................. 10 6.6.1 General ............................................................................................................................................................. 10 6.6.2 Scan plan ......................................................................................................................................................... 10 6.6.3 Complementary evaluation ...................................................................................................................... 10 6.6.4 Scan increment .............................................................................................................................................. 10 6.6.5 Displacement speed .................................................................................................................................... 10 7 Interpretation and analysis of TOFD images ..................................................................................... 11 7.1 Validation of TOFD images ....................................................................................................................... 11 7.2 Relevant indications ................................................................................................................................... 11 7.3 Determination of dimensions and location ........................................................................................ 11 7.3.1 General ............................................................................................................................................................. 11 7.3.2 Discontinuity height .................................................................................................................................... 15 7.3.3 Location of a discontinuity in the plane parallel to the scanning surface ............................... 15 7.3.4 Length of discontinuity .............................................................................................................................. 16 8 Qualification of personnel ........................................................................................................................ 16 9 Test report ...................................................................................................................................................... 16 Annex A (informative)
Example of a reference block .................................................................................... 18 Annex B (informative)
Examples of typical TOFD images of thickness loss due to corrosion/erosion ........................................................................................................................................ 20 oSIST prEN 17290:2018
prEN 17290:2018 (E) 3 Annex C (informative)Example of reference coordinates for the localization of thickness loss ..................................................................................................................................................................... 23 Bibliography ................................................................................................................................................................. 24
oSIST prEN 17290:2018prEN 17290:2018 (E) 4 European foreword This document (prEN 17290:2018) has been prepared by Technical Committee CEN/TC 138 “Non-destructive testing”, the secretariat of which is held by AFNOR. This document is currently submitted to the CEN Enquiry. oSIST prEN 17290:2018
prEN 17290:2018 (E) 5 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 or erosion damage, particularly those defined in ISO 16809. This test applies to unalloyed or low-alloyed steel materials. It applies to components with a nominal thickness
· 6 mm. For smaller thicknesses feasibility tests will be performed to validate the technique. For other materials, feasibility tests are essential too. The TOFD technique can be used here as a stand-alone technique or in combination with other non-destructive testing techniques, during manufacturing and for testing in-service, in order to detect material loss caused by erosion and/or corrosion. This technique is based on analysis of TOFD images established 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 12668-1, Non-destructive testing - Characterization and verification of ultrasonic examination equipment – Part 1: Instruments EN 12668-2, Non-destructive testing - Characterization and verification of ultrasonic examination equipment – Part 2: Probes EN 12668-3:2013, Non-destructive testing - Characterization and verification of ultrasonic examination equipment – Part 3: Combined equipment 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 10863:2011, Non-destructive testing of welds - Ultrasonic testing - Use of time-of-flight diffraction technique (TOFD) (ISO 10863:2011) EN ISO 15626:2013, Non-destructive testing of welds - Time-of-flight diffraction technique (TOFD) - Acceptance levels (ISO 15626:2011) 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) oSIST prEN 17290:2018
prEN 17290:2018 (E) 6 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN ISO 5577, EN ISO 16828 and EN ISO 10863 apply. 4 General specifications 4.1 General The TOFD technique can be applied for thickness measurement on the body of components, pipes and along welded joints. Testing and determination of thickness shall be carried out from the opposite side of the corroded surface. 4.2 Limits of the technique For pipes, components and instrument sleeves 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 for use shall be taken when discontinuities of the following types are present: a) separation; b) misalignment; c) tapering; and d) weld on permanent support. Feasibility tests on representative welds are recommended before using the TOFD technique. 5 Test equipment 5.1 Instrument The ultrasonic instrument used for the examination complies with the requirements of EN 12668-1 and EN ISO 16828. 5.2 Probes and TOFD set-up The ultrasonic probes used for the TOFD technique shall comply with the requirements of EN 12668-2 and EN ISO 16828. The selection of probe characteristics is covered in 6.4. 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 probe centre separation (PCS) within ± 1 mm and constant alignment between the index points. 5.3 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. oSIST prEN 17290:2018
prEN 17290:2018 (E) 7 5.4 Combined equipment Any combined equipment (instrument, probes and cables) that is used shall comply with the requirements of EN ISO 16828 and at least fulfil the checks specified in EN 12668-3:2013, 3.2.1, 3.2.2, 3.4.2, 3.4.3, 3.4.4, and 5.7.4 of this document. 5.5 Reference blocks The use of one or more reference blocks is recommended. The reference blocks should be made of a material with acoustic properties equivalent to those of the test object, at least with regard to sound velocity, surface condition, and geometry. When using the TOFD technique for thickness measurement of welded joints, at least one reference block with a weld is recommended. Thickness of reference blocks is recommended to be between 0,8 and 1,2 times the thickness of the test object with a maximum difference in thickness of 20 mm compared to the test object. The geometry of reference reflectors depends on the profile of corrosion to be covered by the test. They may be flat-bottomed holes, hemispherically-bottomed holes, side-drilled holes, EDM notches. The characteristics of the reference reflectors (type, size, geometry, dimensions, position, accuracy of implementation) shall be in accordance with the expected performance levels. An example of a reference block is given in Annex A. 5.6 Couplant The same couplant shall be used for the settings and for the testing. 6 Application of the technique 6.1 Surface condition The test surface being examined shall be free of paint, loose scale, dried coupling medium and any other product or surface irregularity that may interfere with the transmission of ultrasound into the test object, or that may hinder free movement of the probes or probe holders. The surface roughness, Ra, shall not be greater than 12,5 µm. The surface should be ground if needed. It is allowed to perform testing through the paint (adherent coating) on parts of piping, provided that the test performance is checked. 6.2 Temperature The surface temperature of the obj
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