1/8" per foot bare minimum to 1/4" per foot ( a better minimum yet) 1/4" or more being the best. Steeper drop the better. diameter and distance usually not a factor.
2"
A standard sink drain pipe is typically 1 1/2 inches in diameter.
The size of a standard sink drain pipe is typically 1 1/2 inches in diameter.
A 1.5 to 2-inch diameter pipe is typically used for a sink drain.
The recommended size for a sink drain pipe is typically 1.5 to 2 inches in diameter.
Increase pitch or increade piping diameter
The recommended diameter for a 2-inch drain pipe in a residential plumbing system is typically 2 inches.
1/8 " - 11/2".
The standard kitchen sink drain pipe size is 1 1/2 inches in diameter.
no, in fact most plumbing codes require a 2" drain/trap for washing maching drain.
No, it is not recommended to use a 1 1/2 inch pipe for a shower drain as it may not provide sufficient drainage capacity for the water flow from a shower. It is typically recommended to use a 2 inch pipe for a shower drain to ensure proper drainage.
The building code where I live requires a drain pipe to slope approximately 1/4 inch per foot (+ or - 1/8 inch). The recommended pitch for a 50 foot drain would be 12-1/2 inches.