ISO/TS 24399:2025
(Main)Thermoplastic pipes for the conveyance of fluids — Inspection of polyethylene butt fusion joints using time of flight diffraction testing
Thermoplastic pipes for the conveyance of fluids — Inspection of polyethylene butt fusion joints using time of flight diffraction testing
This document describes the time of flight diffraction (TOFD) testing of polyethylene butt fusion (BF) joints, including pipe-to-pipe, pipe-to-fitting and fitting-to-fitting joints, used for the conveyance of fluids. This document provides a test to detect imperfections such as voids, inclusions, lack of fusions, misalignment and particulate contamination in the BF joints. The document only applies to polyethylene pipes and fittings without a barrier to ultrasonic waves. This document also provides requirements for procedure qualification and guidance for personnel qualifications, which are essential for applying this test technique. This document covers the equipment, the preparation and performance of the test, the indication assessment and the reporting for polyethylene BF joints. Acceptance criteria are not covered in this document. NOTE 1 At present, laboratory experiences exist on the use of TOFD for polyethylene butt fusion joints and/or reference blocks of wall thickness between 8 mm to 100 mm.[1][2][3][4][5][6] Field experience on butt fusion joints in high density polyethylene (HDPE) pipes has been reported.[7] NOTE 2 Interlaboratory testing has shown that TOFD is a viable method for enhancing the integrity assessment of butt fusion joints.[13]
Tubes en matières thermoplastiques pour le transport des fluides — Contrôle des assemblages par soudage bout à bout en polyéthylène au moyen de la technique par diffraction des temps de vol
General Information
Standards Content (Sample)
Technical
Specification
ISO/TS 24399
First edition
Thermoplastic pipes for the
2025-01
conveyance of fluids — Inspection of
polyethylene butt fusion joints using
time of flight diffraction testing
Tubes en matières thermoplastiques pour le transport des fluides —
Contrôle des assemblages par soudage bout à bout en polyéthylène
au moyen de la technique par diffraction des temps de vol
Reference number
© ISO 2025
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ii
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General . 3
5 Information required prior to testing . 3
5.1 Items to be defined for the procedure development . .3
5.2 Specific information required by the operator before testing .3
5.3 Written test procedure .3
6 Personnel qualifications . . 4
7 Equipment . 4
7.1 General .4
7.2 Ultrasonic instrument and display .4
7.3 Ultrasonic probes .4
7.3.1 General .4
7.3.2 Probe selection.4
7.3.3 Probe separation .5
7.4 Scanning mechanisms .6
7.5 Couplant .6
8 Range and sensitivity settings . 6
8.1 Settings . . .6
8.1.1 General .6
8.1.2 Range setting — test volume .6
8.1.3 Time window .7
8.1.4 Time-to-depth conversion .7
8.1.5 Sensitivity settings . .7
8.2 Reference sample.7
8.2.1 General .7
8.2.2 Reference block . .7
8.2.3 Reference reflectors .8
8.3 Checking of the settings .8
9 Equipment checks . 8
10 Test procedure . 8
10.1 Procedure qualification .8
10.2 Scan increment .9
10.3 Component geometry .9
10.4 Preparation of scanning surfaces .9
10.5 Temperature of fusion joint tested .10
10.6 Testing .10
10.7 Data storage .10
11 Interpretation and analysis of test data .10
11.1 General .10
11.2 Assessing the quality of the test data .10
11.3 Identification of relevant indications .11
11.4 Classification of relevant indications .11
11.5 Determination of location and size of indications .11
11.6 Assessment of indications .11
12 Test report .11
Annex A (informative) Example of reference reflectors and reference blocks .13
iii
Annex B (informative) Example procedures for producing imperfections in butt fusion joints
[14]
.................................................................................................................................................................................................................................................. 17
Bibliography .21
iv
Foreword
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transport of fluids, Subcommittee SC 5, General properties of pipes, fittings and valves of plastic materials and
their accessories -- Test methods and basic specifications.
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Technical Specification ISO/TS 24399:2025(en)
Thermoplastic pipes for the conveyance of f
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