RE: [Spam] Re: Underground Sloped Piping

Thank you guys for your input. being relatively new, it's easy to confuse me when I see two charts/references SUPPOSED to be telling me the same thing and they're giving me different numbers. Throws up a red flag. But upon further explanation and some common sense, I can see how numbers vary. Manning's number are purely from the engineering standpoint, while 1/8" per foot or 1'/100' is a number came up with because it meets minimum standards AND is easy to install off of.

From: <a href="/group/PipingDesign/post?postID=8-ujC8y_riMNqyovbeyPcUXMCvn6CfmMrS6j4D5yRTKFzPAH1s2CFzPbQ1tyS64Hi0NLsi797QYF82-XwxAvuauMTS-M">PipingDesign@yahoogroups.com</a> [mailto:<a href="/group/PipingDesign/post?postID=8-ujC8y_riMNqyovbeyPcUXMCvn6CfmMrS6j4D5yRTKFzPAH1s2CFzPbQ1tyS64Hi0NLsi797QYF82-XwxAvuauMTS-M">PipingDesign@yahoogroups.com</a>] On Behalf Of <a href="/group/PipingDesign/post?postID=3RU_GOkAPeA9r61N4hX4BTrx4N0h7Gx7J17yuLyhpLnHAqIGrxZ6qkVGC5RxNpH6ZfmukJFXVbDWEw">bbullough@foth.com</a> Sent: Friday, February 01, 2008 9:30 AM
To: <a href="/group/PipingDesign/post?postID=8-ujC8y_riMNqyovbeyPcUXMCvn6CfmMrS6j4D5yRTKFzPAH1s2CFzPbQ1tyS64Hi0NLsi797QYF82-XwxAvuauMTS-M">PipingDesign@yahoogroups.com</a> Subject: RE: [Spam] Re: [PipingDesign] Underground Sloped Piping

Michael:

I asked this question of a plumber years ago. His reply was very instructive. Yes, it's a velocity thing, and the larger the pipe, etc., the less slope is needed to theoretically keep solids suspended and fluid flowing, but it comes down to being able to assure slope and measure slope, avoiding any low spots. The minimum slope that could be reasonably measured and assured was about 1/8 inch per foot, or 1%. It's easier now to measure with lasers and other high-tech devices, but the standard as been what was practical. The slight deviations are all "about" the same number. Short runs are easily measured with a bubble level to within 1/8 in/ft, longer slopes 1 ft/100 ft with a transit, and they are all about the same number.

... Bruce D. Bullough ...
Lead Process Engineer
Foth Production Systems, LLC
8550 Hudson Boulevard North, Suite 100
Lake Elmo, MN 55042
Direct: +651-288-8598 Fax: +651-288-8551
<a href="http://www.foth.com">http://www.foth.com</a>

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"Michael Roble" <<a href="/group/PipingDesign/post?postID=uea5TiTuMsbj-Xazxqblsx5sedAYFvoAkSoiQm--5A5UImMBT_DlZ50EzVIztgLv9Okv5-FKSI-7Jig">mroble@spcdmg.com</a> <mailto:mroble%40spcdmg.com> > Sent by: <a href="/group/PipingDesign/post?postID=8-ujC8y_riMNqyovbeyPcUXMCvn6CfmMrS6j4D5yRTKFzPAH1s2CFzPbQ1tyS64Hi0NLsi797QYF82-XwxAvuauMTS-M">PipingDesign@yahoogroups.com</a>
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02/01/2008 05:38 AM
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RE: [Spam] Re: [PipingDesign] Underground Sloped Piping

<<<Michael - It's all a relation between flow / pipe size / & velocity, >>

Yeah, that's what I noticed, it just seemed that one slope was given a factor based on run/drop alone, and another one involved both PLUS velocity
and pipe size. Caused a little confusion on my end, but upon looking at it further the chart seems to give a "minimum" slope based on velocity and volume (pipe size) as calculated by some engineer at some point.

It appears that after that minimum on that chart is determined someone just
goes and rounds it to 1/8" per foot (or whatever it is for the given size) to make it something easy to deal with, then makes a factor on THAT.

<<<p.s. I found the identical chart in my old Fluor design guide - date:
1958
- not much changes in this industry - huh >>>

Yeah, tell me about it! My group leader gave me the chart yesterday, and last night right before I left my message on here I Googled it, and the chart was the first selection in the search results. So obviously there's nothing "secret" about this stuff. hehe

.

[Non-text portions of this message have been removed] Received on Fri Feb 01 11:54:00 2008