Re: PWHT on a live Fuel Gas Line

Normally, we dont we perform hot tap if PWHT is required. But if its something that can not wait and can be done safely and assure the joint integrity then the NBIC alternative to PWHT may be the only way to go.

• In PipingDesign@yahoogroups.com, "Sajit Viswan" <sxviswan@...> wrote:
  >
  > 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
  >
  >
  >
  > _____
  >
  > From: PipingDesign@yahoogroups.com
  [mailto:PipingDesign@yahoogroups.com] 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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