Generally 1/8" to 1/4" per foot. Any more than that the liquid waste may run faster than the solids and not carry the solids down.
ASME B31.1
Wouldnt that depend on the diameter of the piping?=12" drainage requires less pitch then 4"=
Piping is installing pipes such as waste /vent/ soil / gas/ water/ etc.
A line used to predetermine the fall /pitch of the drainage or venting lines
What pressure or are you asking drainage THEN What pitch are you using
by calculating the fixture unit requirements and the pitch of the piping for proper drainage
4
*
It needs a vacume line or your pipeing is blown. Or you dont have enough psi to make it work how you want.
The maximum number of drainage fixture unit on a 2" drain line depends on the slope of the drain line. 21 units are allowed if the slope is 1/4' per foot, and 26 units are allowed if the slope of the line is 1/2" per foot.
Dirty water drains will normally be of 100mm internal diameter, laid to a fall of not less than 1 in 60 to avoid settlement of solids or semi-solid material. The maximum distance between manholes in straight lines shall be 90m.
The pitch of a sewer line refers to the slope or angle at which the pipe is installed to facilitate proper drainage. Typically, a sewer line should have a pitch of 1% to 2%, meaning a drop of 1 to 2 inches per 10 feet of pipe. This slope helps wastewater flow smoothly toward the municipal sewer system or septic tank, preventing clogs and ensuring efficient drainage. Proper pitch is crucial for maintaining a functional sewer system.