Re: [MW:19415] REGARDING PWHT OF AIR VESSEL

if the fiber elongation exceeds the specified limit PWHT is required, since in your case vessel is subjected to PWHT, you need not worry about it as the dished along with entire vessel will be heat treated.

On 30 November 2013 11:02, Pinaki Boxi <boxi.pinaki@gmail.com> wrote:

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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