![]() ![]() The simulations and the computation of the POD curves are performed using the software CIVA developed by the CEA-LIST. The methodology to obtain these curves is divided into different steps that are derived from the ASTM standard practices and Det Norske Veritas (DNV) recommendations for these AUT inspection procedures using hit/miss analysis. The first AUT system for testing girth welds of the oil pipeline was tested in early 1980s. The determination of POD curves based on the simulation of the inspection method is presented in the case of the automated ultrasonic (AUT) inspection of girth welds using the zonal discrimination approach. Since few decades, parallel with developing automatic welding systems of the pipeline girth welds, extensive trials has been executed to develop Automatic UT as well for testing the same welds to overcome on the all disadvantages of RT and manual UT. Simulation based POD calculations have recently been introduced in the NDT community. Furthermore the reeling process used for the pipeline installation require severe weld flaw detection capabilities. POD curves were before exclusively obtained thru expensive and time consuming experimental campaigns. REFERENCE LIST EQUIPMENT FOR AUTOMATED ULTRASONIC TESTING OF WELDED AND SEAMLESS PIPES of 4 REFERENCE LIST EQUIPMENT FOR. An implication of this construction method is that the pipeline girth welds have to be made with an austenitic welding consumable (typically Inconel), which is very difficult to inspect using ultrasonic testing method. It plays an important role in the qualification process of nondestructive testing (NDT) methods since it gathers the influence of all the parameters that can alter the detectability of the flaw and, therefore, gives a measure of the performance of the NDT method (in terms of detection capabilities). ![]() ![]() A probability of detection (POD) curve relates the detectability of a flaw to its size. ![]()
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