Re: [Fwd: Ground flush requirement for piping welds.]

From: <Christopher>
Date: Sat Oct 30 2004 - 13:19:00 EDT

On Oct 30, 2004, at 8:07 AM, Paul Bowers wrote:

> We have to give a decision.

you better find yourself an actual welding engineer with pipe fabrication experience. In the first place, you don't want to be sitting in a meeting and telling someone you got your answer from a bunch of people you never met and know nothing whatever about and who have never seen the piping system in question. That's no better than gossip.

You may also have weld procedure issues that you haven't mentioned, since position and specific NDT requirements bear on the issue. Just calling out tig welds is meaningless. The term TIG isn't even correct usage any more.

> Now the debate at site is if the welds are unaccessible position in
> case
> of field welds, then inspection is not possible and if tig technology
> is
> alternatively used then ground flush reqt to be waved off.
Another problem is with language. The sentences I quoted are absolutely meaningless, but that could be that I don't speak Polish. If field welds aren't accessible for NDT, they may very well not be accessible for proper welding. TIG (properly gas tungsten arc or GTA) welding won't make any difference here. If the spec calls for surface grinding the welds have to be surface ground--you haven't mentioned why you're grinding the welds, although that may a fault with my understanding of Polish.

Christopher Wright P.E. |"They couldn't hit an elephant at <a href="/group/PipingDesign/post?postID=6RPV6pWDg5HwpfGUmLMSEyyrA37qtWE0MhLLT-CVs56NAO9lTWGweqDzRdlvR9wyigkqgYyQGoqFtX51EZE">chrisw@skypoint.com</a> | this distance" (last words of Gen.

...................................| John Sedgwick, Spotsylvania 1864)

<a href="http://www.skypoint.com/~chrisw/">http://www.skypoint.com/~chrisw/</a> Received on Sat Oct 30 13:19:00 2004