Non-destructive testing of helically welded pipes made of thermomechanically rolled materials used for sending of combustibles

In the first part of the paper it has been presented the short information on methods of fabrication of helically welded pipes used for transporting of combustibles. In the second one it has been given the NDT methods used during inspection of the pipes in production plants. In the next parts it has been described the NDT methods for steel pipes focusing first of all on visual, ultrasonic and radiographic ones. The paper has been ended with the information about prospects of gas industry development in Poland and in the world.