ISO/DTS 24399

ISO/TC 138/SC 5 N
Date:  2022-06-2707
ISO/TC 138/SC 5/WG 17
Secretariat:  NEN
Thermoplastic pipes for the conveyance of fluids – Inspection of polyethylene
butt fusion joints using time of flight diffraction testing

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Document type: Preliminarily Draft Technical Specification
Document subtype:
Document stage:  (20) Preparatory
Document language:  E
STD Version 2.7f
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Content
Foreword . iv
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 required for test procedure development . 3
5.2 Specific information required by the operator before testing . 3
5.3 Written test procedure . 4
6 Personnel qualifications . 4
7 Equipment . 4
7.1 General . 4
7.2 Ultrasonic instrument and display . 5
7.3 Ultrasonic probes . 5
7.4 Scanning mechanisms . 5
7.5 Couplant. 5
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 . 6
8.1.4   Time-to-depth
conversion………………………………………………………………………………………………. . 7
8.1.5   Sensitivity settings
………………………………………………………………………………………………………….7
8.2     Reference
sample…………………………………………………………………………………………………………… 8
8.2.1 General . 8
8.2.2 Reference block . 8
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 . 9
10.2 Scan increment . 9
10.3 Component geometry . 10
10.4 Preparation of scanning surfaces . 10
10.5 Component temperature . 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 . 11
11.3 Identification of relevant indications . 11
11.4 Classification of relevant indications . 11
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11.5 Determination of location and size of indications . 12
11.6 Assessment of indications . 12
12 Test report . 12

Annex A (Informative) Example of reference reflectors and reference blocks . 14
A.1 Reference reflectors . 14
A.2 Reference blocks . 16
A.2.1 Reference block with SDHs and a surface notch – Single block use . 16
A.2.2 Reference block with SDHs and a surface notch – Multi-block use . 17
Annex B (Informative) Example procedures for producing imperfections in butt fusion
joints . 18
B.1 Planar lack of fusion . 18
B.2 Particulate contamination. 19

Bibliography…………………………………………………………………………………………………………………………
….22
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Foreword
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The committee responsible for this document isThis document was prepared by Technical Committee
ISO/TC 138, Plastics pipes, fittings and valves for the 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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DRAFTTECHNICAL SPECIFICATION ISO/DTS22499

Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
ISO/DTS22499
TECHNICAL SPECIFICATION ISO/DTS 24399:2022(E)

Thermoplastic pipes for the conveyance of fluids — Inspection
of polyethylene butt fusion joints using time of flight
diffraction testing
1 Scope
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, whereby the presence of imperfections such as voids, inclusions, lack of
fusions, misalignment and particulate contamination in the BF joints can be detected. The document is
only applicable to polyethylene pipes and fittings without a barrier to ultrasonic waves.
This document also provides requirement for procedure qualification and guidance for personnel
qualifications which are essential for the application of this test method.
This document also covers the equipment, the preparation and performance of the test, the indication
assessment and the reporting for polyethylene BF joints. The acceptance criteria are not covered in this
document.
NOTE 1:  At the present time laboratory experience
...