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gromeo52
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Join Date: Jul 2009
Posts: 1

Tie-ins to Existing Welded Piping Systems

07/05/2009 12:58 PM

i have a long run of existing ss pipe with no flanges,and need to cut in ss tee.where do i indicate field welds on isometric drawing.should this also be a field fit and weld as opposed to just a field weld.Is it more practical to cut pipe at existing fitting such as elbow.
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munneykhan
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Join Date: Aug 2008
Posts: 26
Good Answers: 2
#1

Re: Tie-ins to Existing Welded Piping Systems

07/06/2009 12:50 AM

it would be better and practically also if you consider fitting to pipe weld joint as a tie-in point.
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#2

Re: Tie-ins to Existing Welded Piping Systems

07/06/2009 3:57 AM

Is a "clamp, gate valve and trepanning" operation out of consideration as an alternative?

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steve moraga csi
Member

Join Date: Jan 2008
Location: California
Posts: 5
#3

Re: Tie-ins to Existing Welded Piping Systems

07/06/2009 12:45 PM

Hot tap!
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Anonymous Poster
#4
In reply to #3

Re: Tie-ins to Existing Welded Piping Systems

07/06/2009 1:02 PM

Good idea,but is this cost effective as opposed to welding.
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steve moraga csi
Member

Join Date: Jan 2008
Location: California
Posts: 5
#5

Re: Tie-ins to Existing Welded Piping Systems

07/06/2009 1:13 PM

If you are not in a hazardous operating environment/commodity, and can isolate your line, field cold cutting and welding is good to go...I work in a flammable hazardous environment, for our needs, hot-tapping is common...it can cost too much to evacuate a line, and can also disrupt the upstream and downstream manufacturing operations. But always....Safety First!
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Anonymous Poster
#6
In reply to #5

Re: Tie-ins to Existing Welded Piping Systems

07/06/2009 4:49 PM

I appreciate your response.Obviously,fabrication of pipe spools is more cost effective if you have flanged connections in system.Again,I appreciate your input.
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Anonymous Poster (2); munneykhan (1); PWSlack (1); steve moraga csi (2)

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