06:57 Nov-21-2005 P V SASTRY R & D, NDT tecniques metallurgy TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D, India, Joined Jan 2003 195
Re: Radigraphic testing ----------- Start Original Message ----------- : Hi : i have a small doubt plz clarify. : whether RT can be carried out for weld/profile shots in a live pipeline( containg fluids, gases)may be water, sour services, natural gas etc etc. ------------ End Original Message ------------
Yes. Radiography can very well be carried out even when the pipe line is filled with a fluid. But care has to be taken while caliculating the exposure time to offset the abosrbtion of radiation by the fluid across the given diameter of the pipe. Also too much of turbulence of the fluid(other than gases), if present, will interfere with the results.
More than 30 years back, a construction engineer expressed a similar doubt with an interesting extenstion. He was quite worried that the fluid may become radioactive after the exposure. It took some convincing before he allowed the radiography of the accumulator piping.