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BS EN 17290:2021

BS EN 17290:2021

$142.49

Non-destructive testing. Ultrasonic testing. Examination for loss of thickness due to erosion and/or corrosion using the TOFD technique

Published By Publication Date Number of Pages
BSI 2021 26
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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.

PDF Catalog

PDF Pages PDF Title
2 National foreword
5 European foreword
6 1 Scope
2 Normative references
3 Terms and definitions
7 4 General specifications
4.1 General
4.2 Limits of the test technique
5 Qualification of personnel
6 Test equipment
6.1 Instrument
6.2 Probes and TOFD set-up
6.3 Encoder
8 6.4 Combined equipment
6.5 Reference blocks
6.6 Couplant
7 Application of the technique
7.1 Surface condition
7.2 Temperature
7.3 Marking
7.4 Selection of probes and PCS
9 7.5 Instrument settings
7.5.1 Time window
10 7.5.2 Time-to-depth conversion
7.5.3 Sensitivity setting
7.5.4 Checking of the combined equipment
11 7.6 Testing
7.6.1 General
7.6.2 Scan plan
7.6.3 Complementary evaluation
7.6.4 Scan increment
7.6.5 Scanning speed
12 8 Interpretation and analysis of TOFD images
8.1 Validation of TOFD images
8.2 Relevant indications
8.3 Determination of dimensions and location
8.3.1 General
13 8.3.2 Flat objects
14 8.3.3 Convex objects
16 8.3.4 Concave objects
17 8.3.5 Maximum height of an eroded and/or corroded area
8.3.6 Location of a discontinuity
8.3.7 Length of a discontinuity
9 Test report
19 Annex A (informative) Example of a reference block
21 Annex B (informative) Examples of typical TOFD images of loss of thickness due to erosion and/or corrosion
24 Bibliography

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BS EN 17290:2021
$142.49