10-07-11, 09:36 AM | #1 |
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Minimum plumbing slope for drainage?
I'm trying to figure out the tank to solar panel slope I'll need. I believe the general rule is 1/4" every foot. Is it possible to get away with less than this?
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10-07-11, 01:35 PM | #2 | |
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01-16-12, 08:24 PM | #3 | |
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01-26-12, 08:17 PM | #4 |
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The code required slope for drainage pipes is specified to maintain what's known as a "scouring velocity" - this is to keep solids in suspension and prevent accumulations. The Manning formula - Wikipedia, the free encyclopedia would be the formalization of this. International Plumbing Code specifies 1/4 inch per foot minimum slope for pipes <3", and 1/8 inch per foot for 3-6" pipes.
Do you need to be concerned with solids in suspension? |
01-26-12, 10:00 PM | #5 |
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Thanks for the update mrd.
I do not have to be concerned with solids suspension. The question was in regards to for a drain back system for a solar hot water setup. In the end I decided to do a pressurized loop instead of a drain back just due to the grade of my land.
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03-16-12, 10:18 AM | #6 |
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standard plumbing falls are 1 in 40 for 4 inch drain (2.5%) and 1 in 60 for 6 inch but any fall for liquid is ok if its just water and time is not an issue
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03-16-12, 12:07 PM | #7 | |
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International plumbing code does not legally superseded all local plumbing code. I know this to be true in the state where I live, Oregon, USA. Here, although physics and International Plumbing Code would allow lower slopes, local code specifies slightly greater slope, and construction cannot legally proceed until a local inspector, who is bound by the local code, approves the particulars of the installation upon inspection. I fully realize that DIY and legality may diverge, so it is wise to be aware of all aspects of the situation. -AC_Hacker
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