I have a question about what is the need for DPT test on Tube-Tubesheet Welding. what is the effect of using DPT and what type of defect it can detect and whether it result is reliable or not.
If there is any other method for testing the Tube-Tubesheet Welding of cost effective, please inform me and also give a guidance to do.
My higher management people feel DPT is a waste of money and time, it result will not reliable and does not show anything. Previously i had a experience on one of our equipment passed the DPT but failed in the Pressure Testing and we had to repair it, later we found we had used wrong electrode ( instead for stainless steel we used Carbon steel). My manager refer to this incident and telling it is a waste of doing. I tried to explain him it is not because of DPT but due to the wrong electrode but he is not ready to accept that and he tell, choosing electrode is depend on production and only i want the answer why it passed DPT and failed Hydrostatic test, so DPT is waste
I feel to do DPT is better to asses defect opened to surrounding and also the finish of the welding.
Please help me in this topic and also suggest some other method to test the welding .
Thanks a Lot for all