For branching types, reference charts are provided in STDs. You can refer the same for offshore piping as well as onshore. For basis of selecting Stub In and Stub On connection and the requirement of reinforcement for same, you can obtain details from ASME B 31.3.
But it is not advisable to go for pipe to pipe direct connection inplace of proper fittings for branching. As stated by Christopher, it will only result in poor quality work.
regards,
rakesh
"Paul Bowers" <pbowers@pipingdesign.com>
05/04/2004 08:58 AM
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Re: [PipingDesign] Banching from pipes
Yeah, it sounds like he's talking about stub-ins/stub-ons.
Paul
> >By a comparison between direct pipe to pipe connection and making use
of
> >fittings or self reinforced fittings for taking branch ,it goes
without
> >saying that the quality and easiness of the job would be much better
in
> >the latter case but regarding cost the former would be cheaper.
> If I understand you correctly, a 'direct pipe to pipe connection'
means a
> hole manually burned in the run, and the branch hand burned and ground
to
> the contour of the run. If the joint isn't fit up properly it will be
a
> starting point for a fatigue or corrosion failure, and if it isn't
> cleaned up with no protruding edges, it'll be a mess for fluid flow.
My
> own opinion is that if such an operation truly is cheaper, it's
because
> weld quality is compromised, and that isn't really cheaper at all
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[Non-text portions of this message have been removed] Received on Tue May 11 23:43:00 2004
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