Horizontal Pipe Discharge Through Roof

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.

Horizontal pipe discharge through roof.

Window or fresh air intake. 2 56 times 24 times 2 squared divided by the square root. 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. 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.

If it slopes upward the indicated discharge will be too high. 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. The epa and other guidelines somewhat follow the standard codes for plumbing vent pipes which generally are vented above the buildings roof. May be measured at horizontal distances x from the pipe exit of 6 12 or 18 inches.

The most accurate results will be obtained when the pipe is truly horizontal. Then by the formula the flow in the pipe in gallons per minute is. All open vent pipes that extend through a roof shall be terminated at least number typically 6 inches mm above the roof except that where a roof is to be used for any purpose other than weather protection the vent extensions shall be run at least 7 feet 2134 mm above the roof.