Horizontal Pipe Discharge Through Roof

The grade on the horizontal pipe also dictates how far the pipe can travel before it encroaches into the useful building space and as such requiring a vertical downpipe.

Horizontal pipe discharge through roof. If it slopes upward the indicated discharge will be too high. Then by the formula the flow in the pipe in gallons per minute is. 1 place the ruler on top of the discharge pipe and extend it out far enough out so that the plumb bob or ruler spans the length of the jet flow portion of discharge see figure xxx 2 slide the ruler back along the pipe as needed to measure the jet flow segment of discharge. New york state just raised plumbing vent pipe code from 12 inches to 18 inches above the roof and at least 10 feet horizontal distance from any opening to the building i e.

In modern roof drainage design a horizontal gravity pipe could be sloped to take up to two thirds water with a one third air mix depending on gradient. 2 56 times 24 times 2 squared divided by the square root. Then measure vertically to the top of the liquid discharge y say it is 25 inches. Window or fresh air intake.

For example â measure a distance x of 24 inches across the top of the flowing discharge from the end of a 2 inch diameter pipe. The most accurate results will be obtained when the pipe is truly horizontal. If it slopes downward the indicated discharge will be too low.