[MW:19413] REGARDING PWHT OF AIR VESSEL

Respected sir,

Description of vessel:- 18097m length X 4.1m dia

Shell course thickness :- 24mm 

2:1 Elliptical Head thickness :- 28mm after forming it will be come 25mm

Material :- SA516 Gr70

Service :- Air

As per section VIII div-I UCS-79 reduction by cold forming the as rolled thickness is more than 10./. at any location where the extreme fiber elongation exceeds 5./.

PWHT is required.

But as per drawing it is on PWHT,

i am really confused regarding forming of 2:1 Elliptical Head PHWT.

So pls conformed me  2:1 Elliptical Head PHWT is required or not, if no so what base of section - VIII div-I it is not required, or PWHT is required what base of section - VIII div-I it is required,

 

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Thanks & Regards
Pinaki Boxi.
Fujairah, AUE.

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