Jörg Wermelinger, Sunwoong Choi
# 2021 Amsterdam
In the development of an international standard on non-destructive test for polyethylene electrofusion socket (EF) joints, the inspection capability of the phased array ultrasonic test (PAUT) in assessing flaws in the joints was needed to establish procedure qualification of the test method. For this, a worldwide inter-laboratory round robin test on PAUT was carryout at ISO/TC138/SC5/WG17 working group . This involved polyethylene EF joints containing various known defects that were inspected independently by the PAUT participants, followed by the destructive testing of the joints to confirm the PAUT assessments. The results were presented in terms of percentage of detection, percentage of correct classification, and percentage of false call. These indicated that PAUT is a viable non-destructive test method for inspecting polyethylene EF joints with a high-quality level when the required procedure qualification and personnel qualification for inspection are closely followed. Accordingly, the procedure qualification requirement of ISO/TS 16943 was established. It was also shown that the strip bend test of ISO 21751 modified with the new optimized device has proven to be useful as the destructive test for the EF joints.