ASME B31.3-PWHT TWICE ON THE SAME JOINTS

Nalla · **Joined:** Fri Feb 20, 2009 3:28 am **Posts:** 25

Dear Friends
Process Piping - Carbon Steel Piping - 6" Sch XXS ( 21.9mm )- PWHT done on the same butt joint twice. RT done after 1st PWHT-It passed.Is it acceptable to ASME B31.3?
What harm done the joint ( weld metal & HAZ ) undergone PWHT twice, in terms of Mechanical Properties.... etc.
Thanks

ahmed osman · **Joined:** Sat Mar 28, 2009 2:32 pm **Posts:** 2

dear sir,

which kind of heat treatment you used ?
if it is just stress releve it will not affect the mechanical properities
if you will use temprature above tranformation temp. " Normalizing or annealing " you will change the mech. properities

Nalla · **Joined:** Fri Feb 20, 2009 3:28 am **Posts:** 25

Dear Friend
PWHT TO STRESS RELIEF
Btw, For P1 Group Material is it mandatory as per ASME B31.3 to do MPI after PWHT?
Thanks

ASME B31.3-PWHT TWICE ON THE SAME JOINTS

Who is online