It's likely a certification issue, given that I don't know how the
code(s) cover pressure welding vs. non-pressure welding for this type of
thing. Who welds the dummy leg to the pipe? Shop or field? If the
assembly was shop-tested, would the elbow's buttweld be affected by
welding over it for the dummy leg? As I've mentioned, I don't know
enough about it to make an intelligent decision.
Paul
> Paul,
>
> I can not recall seeing that particular detail however it would not
worry
> me to use it. I don't think the stresses generated are likely to be
> greater than those on a dummy leg welded to a 90 degree elbow. I
expect
> you are concerned about the stresses generated at the joint between
the
> elbow and the leg. The bending moment is spread over a much larger
area at
> the contract point in this case compared to the 90 degree elbow case
so I
> would expect the stresses to be less.
>
> Gordon Reddek
>
> "Paul Bowers" <pbowers@pipingdesign.com>
> 16/04/2004 09:50 AM
> Please respond to PipingDesign
>
> To: <PipingDesign@yahoogroups.com>
> cc:
> Subject: [PipingDesign] Horizontal Dummy Leg Question
>
>
> Has anyone ever seen a horizontal dummy leg used on a 45 degree elbow?
>
> Here's a quick sketch:
>
> <a href="http://www.pipingdesign.com/drawings/dummy.jpg">http://www.pipingdesign.com/drawings/dummy.jpg</a>
>
> It is assumed that the non-penetrating weld between the DL and the
elbow
> would overlap, although the sketch doesn't show this.
Received on Thu Apr 15 22:29:00 2004
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