B31.3: 704-760 C, minimum holding time 2 hrs. Holding time 1hr/in.
B31.1: 730-775 C, minimum holding time 30 minutes. Holding time 1hr/in. Note: As it is a dissimilar material welding and a nickel based consumable is recommended therefore minimum holding temperature shall be 700 C.
Octane
On Fri, Oct 4, 2013 at 7:33 PM, Abhishek Rai <abhishekkrrai@gmail.com> wrote:
Dear Sir,--Please confirm the requirement of PWHT b/w welding of P91 & SS 304.the operating temperature of piping is 640 deg c .
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