APWHT, BPWHT RT films

This is a subject which becomes very hot when literature and experience comes face to face. Just as you have mentioned that you haven't experienced any discontinuity caused by PWHT in thirty years, some people also have the same opinion based upon their experience. But yet there are some who have an opposite response to that, having different experience.

I personally believe that RT or UT before PWHT is sufficient when you are dealing with carbon steel or those alloys having Cr less than 5% like P1, P11 and P22 etc as the crack susceptibility is lower. But yes I have experienced some cracks during PWHT process while dealing with P5 and P9 alloys due to higher crack susceptibility.

Going by book, it is a too good practice to have RT or UT (preferably) after PWHT cycle also but practically when you are talking about large construction projects, such practice would eat up much and much of your construction progress.

You would definitely find these links useful where a lot of discussion was held with other experts. http://www.hghouston.com/dcforum/DCForumID2/352.html & http://forums.thepetrostreet.com/viewtopic.php?f=14&t=5&sid=ea85d93dbbef71870546de63e818ae37

Regards,

Ashfaq Anwer

http://thepetrostreet.com

Thanks Mr Ashfaq