Re: Horizontal Dummy Leg Question

Thanks all for the replies.

Here's a better image, scanned from my archives (source info removed to protect the guilty, I.E., me):

http://www.pipingdesign.com/drawings/dummy.pdf

This appears to be a shop fab trunnion and it gives a minimum spacing between fitting and dummy leg weld.

Paul

From: <Gordon.Reddek@Alcan.com>

> This all depends on the situation. I would expect only one code to
apply,
> be it an ASME, API or whatever other code covers the industry you are
> dealing with. The relevant code should dictate how welding on the
outside
> of the pipe should be handled. Assuming you are dealing with a
serious
> line due to its pressure or contents, my expectation is the following:
> 1) The design of the joint must be approved by a competent stress
engineer
> 2) The integrity of the dummy leg weld will most probably be tested
with
> dye penetration or mag particle. They do not seem to trust X or gamma
ray
> on anything other than straight butt welds.
> 3) The leg MUST be welded on before heat treatment and hydrotest.
Welding
> to tested pipe is generally a no-no. Generally you will be allowed to
> weld on a longer leg and trim it to length on site, but performing the
> weld to the pressure pipe after testing is definitely not on.
>
> You need to establish the governing code and go by it.
Received on Fri Apr 16 22:03:00 2004