1/4 inch per foot.
Chat with our AI personalities
Probably the wrong size flange. Is the flange a toilet collar? If so the pipe is probably 4 inch.
1% = 1/100 means 1 inch drop over 100 inches of drain pipe that is slightly more than 8 feet 1 in drop over 8 ft 4 in
Wouldn't recommend it as things may back up in the drain line. 4" line is the norm ... you want to get rid of waste, not keep it around longer.
With large diameters like that you will most probably need to insert a weld-on 12 inch - 10 inch reducer at the point where the reduction is required. The pipe and reducer perimeter edges should be bevelled, say 45 degrees, for good weld penetration especially if the pipe conveys fluid under pressure.
The volume of a 12 inch x 12 inch pipe is: 1,360 cubic inches