Re: [PipingDesign] Pipelines and Slope

I'm not a pipeline guy either, but I do know that a standard sewer line slope is mnimum 1/8" per foot (about 1%). this facilitates draining. A 1% slope is about the minimum that could be measured back in the days before laser alignment. Even concrete pipe is adjustable to 1-2%. your 1/4" per foot is about 2% slope. I'd be surprised if a pipe didn't have 2% bend or displacement available. I know that it would require supports and hangers to accomdate the slope over longer distances. and geographic disparities need to be accounted for.

... Bruce D. Bullough ...
Sr. Technical Consultant
Foth Companies
8550 Hudson Boulevard North, Suite 100
Lake Elmo, MN 55042
Phone: (651) 288-8598 Fax: (651) 288-8551 cell: (651) 269-1514 http://www.foth.com

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Paul Bowers <pbowers@pipingdesign.com>
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[PipingDesign] Pipelines and Slope

I'm not a pipeline guy, so I have a question that may sound very basic.

If, say, a 5KM aboveground pipeline has to be sloped 1/4" per foot, how is it fabricated and installed? I suppose construction tolerances as well as support spacing and line deflection come into play here (no sense in sloping 1/4" if natural deflection is 1").

Is it fabricated "flat" and then layed "at an angle" by varying the shoe/saddle heights or are the buttwelds subtly "tweaked" with cutback elbows?

Paul

PS http://www.pipingdesign.com has been updated with a few new interesting links.

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Received on Fri Mar 27 00:05:00 2009