Re: Stress Relieving

• In PipingDesign@yahoogroups.com, sviswan@... wrote:
  >
  > The NACE fabrication requirement is about the control on the
  resulting
  > hardness of the weldment and not specifically that requiring PWHT.
  A WPS
  > that which can consistently give weld hardness within the limits
  of 22 HRC,
  > does not require to have the PWHT.
  >
  > Sajit
  > _____________________________
  

Reference to NACE was made in a reaction to S P Bhat remarks where he says:

For A 106 Gr B , P-No is 1 ( as per 31.1) & since the pipe thickness is less
than 19 mm both post weld & preheat are not required ( assuming ambient temp as
minimum 21 Deg C)

He further state that this was based on B31.1 (probably a power piping code user). I have not used B31.1 (basically we've used it in conjucntion with Section III while working in a nuke plant) for over 20 years having move to process industries. But perhaps by going over the NACE ( we normally pwht a weld joint in sour service) i was hoping that possibly he might again check the code requirement and perhaps consider PWHT. If my remarks have not added any value, my apology and request the admin to delete it. But b4 zapping it my i just add that Some of the best works related to welding of pipe in sour service was sponsored by NACE. Received on Wed Feb 27 00:19:00 2008