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Acceptance criteria for non-destructive testing of PE electrofusion joints

 

Peter Postma

Papers # 2016 Berlin

On request of the Dutch DSO’s and in cooperation with all important Dutch stakeholders (producers, suppliers, contractors and the regulator), Kiwa Technology investigated the relevancy of defects found with Phased Array Ultrasonic Testing (PAUT) and if it was possible to determine acceptance criteria. The project showed that using the PAUT nondestructive testing (NDT) method, mainly voids are found, and that there is a relationship between presence of voids and destructive test results. Based on the results, preliminary acceptance criteria are proposed.

On request of the Dutch DSO’s and in cooperation with all important Dutch stakeholders (producers, suppliers, contractors and the regulator), Kiwa Technology investigated the relevancy of defects found with Phased Array Ultrasonic Testing (PAUT). The objective was twofold:

  • Can relevant defects, that occur in practice, be found with PAUT?
  • Is it possible to setup acceptance criteria?

The project showed that with PAUT mainly voids are found in electrofusion joints made in practice. It was not possible to detect so called cold welds (brittle failure) directly. Still, there is a relationship between the presence of deviations and brittle failure in a peel decohesion test (ISO 13954 [1]). Based on these results, the stakeholders agreed on preliminary acceptance criteria.

Related keywords : Electrofusion joint, non-destructive testing, PAUT.
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