RE: PWHT on a live Fuel Gas Line

From: <Sajit>
Date: Sat Jan 27 2007 - 13:31:00 EST

It may not be possible to have PWHT on a hot tap fitting welded on to a live line. It will be a case where the WPS have to include the parameters to arrive at a compromise weldment that will have a close enough result that which is achievable otherwise through the PWHT.

In a similar case of hot tap welding on to a sour service gas pipeline, Gasunie, a dutch hot tap specialist welding services company was asked whether the welding procedure will be able to achieve the weld hardness required by NACE. The answer was no.

Sajit

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From: <a href="/group/PipingDesign/post?postID=5wxRGv3wJ8TcdKdZxuFV_ZoX_apoXdeKYVaSZFnYmNZeCiY-f5pOeZUfmjHY4K2kw3T9iuuoFydBLe4Ipsf_ytVU4w">PipingDesign@yahoogroups.com</a> [mailto:<a href="/group/PipingDesign/post?postID=5wxRGv3wJ8TcdKdZxuFV_ZoX_apoXdeKYVaSZFnYmNZeCiY-f5pOeZUfmjHY4K2kw3T9iuuoFydBLe4Ipsf_ytVU4w">PipingDesign@yahoogroups.com</a>] On Behalf Of dd jdh
Sent: Saturday, January 27, 2007 11:57 AM To: pipe
Subject: [PipingDesign] PWHT on a live Fuel Gas Line

hi every one,

I have a 42" Split Tee Hot Tapping connection on a 550 psig design pressure 200 deg F design temp. petroleum fuel gas line.But the split Tee provided is of 30mm.Ofcourse should go for PWHT.

Is this feasible on a live fuel gas line or whether there will be any other alternative.

Thanks in advance,

regards,

Sadanandan.M.K
PE,
Middle East

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Received on Sat Jan 27 13:31:00 2007