Thanks for reply me FikYa but i was referening when i replace a new pipe of a system, so the question is What NDT can i use in case of new replacement of a piece of pipe? thats depends of what kind of service is because you have for example in API 570 Service 1 or 2 or 3 depends of the fluid systems or ASME 31.3 Fluid Type D or M or for Normal Service