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Here's the situation:
I am running a sewer line from my second unit at the back of the lot, and tying into an existing 4" clay pipe sewer near the front of the lot.
I have decent slope, about 1/2" per foot.
The second unit generates an absolute maximum of 14 fixture units (assuming 2 sinks, 1 toilet, washing machine, dishwasher, and a shower).
It would seem from the UPC, CPC TABLE 7-5 that I can use a 3" ABS pipe without a problem from the new unit all the way (100 feet, straight run)to the wye connection at the existing 4" clay pipe.
So my question is, will a 3" pipe provide better and more hassle-free performance? Or is a 4" better, and worth the nominal extra expense?
My local building dept goes by the california plumbing code which quotes the UPC, which as far as I can tell allows either 3" or 4" for this purpose.
I really don't mind spending the extra $100 for 4" ABS IF it gives me better performance.
On the other hand if for some reason 3" pipe yields a better flowing pipe (venturi effect? particulate flow? vortex inertia?) then I will use it. the smaller trough radius of 3" pipe sure must handle the loads differently than the 4". Is bigger always better in moving solid waste? Maybe it is. Anybody know for sure?
I am running a sewer line from my second unit at the back of the lot, and tying into an existing 4" clay pipe sewer near the front of the lot.
I have decent slope, about 1/2" per foot.
The second unit generates an absolute maximum of 14 fixture units (assuming 2 sinks, 1 toilet, washing machine, dishwasher, and a shower).
It would seem from the UPC, CPC TABLE 7-5 that I can use a 3" ABS pipe without a problem from the new unit all the way (100 feet, straight run)to the wye connection at the existing 4" clay pipe.
So my question is, will a 3" pipe provide better and more hassle-free performance? Or is a 4" better, and worth the nominal extra expense?
My local building dept goes by the california plumbing code which quotes the UPC, which as far as I can tell allows either 3" or 4" for this purpose.
I really don't mind spending the extra $100 for 4" ABS IF it gives me better performance.
On the other hand if for some reason 3" pipe yields a better flowing pipe (venturi effect? particulate flow? vortex inertia?) then I will use it. the smaller trough radius of 3" pipe sure must handle the loads differently than the 4". Is bigger always better in moving solid waste? Maybe it is. Anybody know for sure?
