Project Specific AUT Automatic Ultrasonic Testing Validation to Determine Height Sizing Accuracy for Pipeline Girth Weld ECA Acceptance Criteria.

Abstract

Objective of project specific AUT (Automated Ultrasonic Testing using Zonal Discrimination) Procedure validation is to verify that the implementation of pre-qualified AUT system performance for the inspection of project specific Pipeline girth welds without changing any essential parameter of system qualification processes. As per the requirement of DNV-OS-F101, the purpose of the project specific AUT validation is not to perform any new PoD (Probability of detection) analysis. However, to verify the reliability aspects of the system in terms of HSA (height sizing accuracy) to meet the AUT system qualification requirement is to ascertain the project specific AUT procedure adequately capable of detecting and sizing of the smallest critical defects. This is achieved through a detailed validation programme using the project specific welding procedure and pipe material representing actual pipelay scenario.