Sanitary Drain Pipe Sizing

In this article i will review some information on drainage pipe systems including definitions gravity flow in stacks drainage fixture units dfus and horizontal pipe slope and sizing.

Sanitary drain pipe sizing.

Sizes the piping needed on the acreage to. A sanitary drainage system generally consists of. Building drains and sewers for si. When combined with a laundry tub the drain pipe must be a minimum of 2 inches in diameter.

1 inch 25 4 mm 1 inch per foot 83 3 mm m. And a building sewer from the building drain to the point of disposal. A particular pipe size on a given grade will only carry a certain amount of water. The steeper the grade of the installed pipe the more water it will carry.

Checks the capacity of drain tile on existing drainage systems. A fixture unit is equal to one cubic foot of water drained in an 1 1 4 pipe over one minute 7 48 us gpm 0 47 l s. Maximum drainage fixture units dfu in stacks and horizontal fixture branches 0 no water closet permitted 1 maximum two water closets. And toilet requires a drain pipe of 3 inches in diameter unless two toilets are on the same drain and.

The table indicates that the minimum slope for a building drain with 44 dfu is 1 8 per one foot of pipe and the minimum pipe diameter at 1 8 slope is 4 finally you can use ipc table 916 1 see figure 4 to size vent piping using the dfu values from step one and waste stack sizes from steps two and three.