A site test comparison of real time radiography with conventional film radiography for the fitness-for-purpose assessment of butt welds in offshore pipelines

The paper reports a site test comparison of conventional film radiography with real time radiography (RTR) for the fitness-for-purpose assessment of butt welds in offshore pipelines. The basis for the work, the RTR technology, existing applications of RTR, status of governing codes, and operational utilisation are all briefly outlined. The RTR system was site tested on board a pipelaying barge operating on the North Sea. The tests for the comparison were based on six considerations: image qualification, cycle time, total cost, reliability, record keeping ability, and safety of personal. These tests are described and the results are discussed. The site testing has shown that RTR is certainly feasible for use on board an operating laybarge, and offers many advantages over conventional film radiography. (UK)