A 16-inch diameter pipe of schedule 120 has a 1.219-inch thickness.
An 8-inch diameter pipe of schedule 120 has a 0.719-inch thickness.
Since the 8-inch weldolet is SA-335-P11, presumably so too is the 16-inch pipe, which is an ASME P-No. 4 classification.
Presuming that the weldolet attachment weld is a full penetration weld into the pipe, then the controlling, or governing, thickness of the weldment assembly is 1.219 inches.
Therefore, the PWHT soak time must be a minimum of 1-1/4 hours.
However, it there is a finishing fillet weld whose throat thickness exceeds the pipe thickness, then the throat thickness governs the PWHT soak time, at 1 hr/inch of thickness.
Regards,
D. Thompson
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of smith
Sent: Monday, November 27, 2017 7:55 AM
To: Materials & Welding
Subject: [MW:27064] B31.1 pwht for P11 WELDOLET requirement.
hello.
I need to know about PWHT time for RUN PIPE 16" S120 to 8" S120 P11 WELDOLET PWHT hold time. if anyone know how to figure this time please guide me.
thank you.
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