1/8 per ft
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1/8" per foot.
Absolutely NOT you 2" minimum
Pipe bore is the actual minimum inside diameter of a pipe, which is not necessarily the nominal pipe size.
It depends on the pipe schedule and diameter... For example. Schedule 40 1 Inch pipe has a minimum burst pressure pressure rating of 1440PSI and an operational PSI of 270. Google can provide a complete chart. Just search "PVC Pipes - Pressure Ratings"
Plumbing pitch is the amount of fall you have on your waste. All waste, not on a pump system, has to have fall toward the destination of the waste (septic tank, sewer, etc.) The pitch is basically a downhill tilt of the pipe it requires to drain the liquid and solid waste from the pipe utilizing gravity. standard fall on a waste pipe is 1/8 of an inch per foot. the reasoning behind this is that your solid waste runs with your liquid waste minimizing clogs and optimizing drainage.