thanks, ben. now its clear to me

it should be asme sec 8, div 1. In our plant also, such exchangers r there and not post weld heat treated. By the way, one query id there: what is the logic behind difference between governing thickness for pwht in sec 8 div 1 & b31.3 for same material?

@ Fizza, nice link... Very useful.

ASME SECTION IX QW422

Dear sirs,

What is meant by "stationary header" and "floating header" wrt fin fan coolers? (air fin coolers)

Regards,

Excellent presentation, dear Usman sir. Great...

Dear friends ,
I have a doubt in the governing thickness for PWHT for two
different codes i .e. ASME Section VIII Div- 1 and ASME B 31 .3 .
ASME B 31 .3 :
In Chapter V , as per clause 331 .1. 3 " When components are joined
by welding, the thickness to be used in applying the heat
treatment ...

Thanks for quick response....

Dear sirs,

We have a 36" dia CS piping with insulation + steam tracing. The piping is internally aluminized. Following is the details:

MoC: A672 C60 Cl 12, internally aluminized

Size: 36" x 7.92 mm thk

Service: Acid gases (sulfur rich)

Operating Conditions: Pressure- 0.6 kg/cm2, Temp- cyclic ...