Horizontal Pipe Discharge Through Roof

The most accurate results will be obtained when the pipe is truly horizontal.

Horizontal pipe discharge through roof.

Then by the formula the flow in the pipe in gallons per minute is. May be measured at horizontal distances x from the pipe exit of 6 12 or 18 inches. Window or fresh air intake. 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.

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. If it slopes downward the indicated discharge will be too low. 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. 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.

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. If it slopes upward the indicated discharge will be too high.