ISO/TS 24399:2025

Thermoplastic pipes for the conveyance of fluids — Inspection of polyethylene butt fusion joints using time of flight diffraction testing ISO/TS 24399:2025

Publication date:   Jan 23, 2025

General information

60.60 Standard published   Jan 23, 2025

ISO

ISO/TC 138/SC 5 General properties of pipes, fittings and valves of plastic materials and their accessories -- Test methods and basic specifications

Technical Specification

23.040.20   Plastics pipes | 23.040.60   Flanges, couplings and joints

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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 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]

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PUBLISHED
ISO/TS 24399:2025
60.60 Standard published
Jan 23, 2025