Detection of Creep Degradation on Collapsed Membrane Wall From P265GH Pressure Purpose Steel by Ultrasonic Testing

Creep failure of the pressure vessels operated at high temperatures in power and petrochemical industry is a frequent reason of its collapse. Some ultrasonic properties, as the ultrasonic waves’ velocity, are sensitive to change of material properties due to thermally induced degradation processes, especially plastic deformation. The article discusses possible applications of ultrasonic testing to detect creep degradation process based on results of measurements performed on collapsed membrane wall from P265GH pressure purpose steel. The methodology may help with selection of potentially critical areas on pressure equipment under operation prior its further investigation while performing e.g. residual life assessment.