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Re: O/Tsewage length (Sorry)
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Posted by Bus Driver on March 21, 2007 at 04:43:05 from (66.44.253.99):
In Reply to: Re: O/Tsewage length (Sorry) posted by Larry from Mich. on March 20, 2007 at 17:09:57:
Most codes require a minimum pitch of 1/8" per foot of length for 3" or 4" lines. The idea that 1/8" will move solids along, but that certain steeper pitches will let the solids drop out and the water continue on is simply an old myth. Material that is moving stops only if some force is applied to make it stop, one of Newton's Laws of Motion. So if sewage solids are flowing at 1/8" per foot, why would they stop at pitches of 1/2" per foot? If you park your car on a slope and not set any means to prevent rolling, will it roll on a gentle slope and stop buy itself on a steeper slope? The codes specify only a minimum pitch for gravity drain lines. Anything steeper is acceptable.
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