Mr.Senthil..
The main purpose of doing immediate PWHT without post heating is to avoid hydrogen induced cracking.. To my knowledge there is no code requirement or specification mentioning about the time after which you can do the PWHT.
But please note that delaying the PWHT after welding will improve the condition for hydrogen induced cold cracking. So the PWHT has to be carrried out immediately after completion of welding.
best regards,
M.S.Muthu selvam.
On Tue, Oct 5, 2010 at 10:42 PM, senthil raja <senthilrajabarathi@gmail.com> wrote:
Hi,
I m Senthil working in L&T. I m presently in MRPL project,
Mangalore. In our client(EIL) specification it is given that post
heating shall be carried out for the alloy steels (Cr-Mo) where PWHT
cannot be carried out immediately.
I need to know what is the time limit within which PWHT shall be
carried out without post heating. What is the standard or code which
can be reffered for this.
Kindly share your experience sirs & friends,
regards,
Senthil Raja.
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