Height Sizing Correction for Submarine Pipeline AUT Zone Discrimination Method

The reasons that large quantitative errors existed in submarine pipeline AUT zone discrimination height sizing were analyzed through the theoretical analysis method and the height sizing quantitative correction methods were proposed. The accuracy and reliability of the correction method was verified, and received the third party acceptance. For root, surface and inter defects, AUT zone discrimination height sizing accuracy was improved to less than 1mm after adopting sizing correction and showed advantages of different location defects being with different evaluating methods. It can provide better quality assurance for future submarine pipeline laying.