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Choose your valve size

Step 1: Calculate Rainfall

1.Use rainfall intensity chart to find rainfall amount in inches per hour (in./hr.) for the site, then calculate to determine feet per hour (ft./hr.)
Rainfall ___________ in./hr. divided by 12 in. = ___________ ft./hr.
2.Measure stormwater drainage area to be protected by oil stop valve , then determine square footage as follows:
Length ___________ ft. x Width ___________ ft. = ___________ sq. ft.
3.Multiply the rainfall (ft./hr.) in step 1. by the area (sq.ft.) in step 2 determine the oil stop valve flow rate in cubic feet per hour (cu.ft./hr.):
___________ ft./hr x ___________ sq.ft. = ___________ cu.ft./hr.
4.Multiply flow rate (cu.ft./hr.) from step 3 by 0.1247 to convert flow rate to U.S. gallon per minute (gpm):
___________ cu.ft./hr. x 0.1247 = ___________ gpm.

Step 2: Choose Valve Size

VALVE SIZE(MAX) FLOW RATE
4" DIAMETER160 GPM
4" DIAMETER160 GPM
6" DIAMETER360 GPM
8" DIAMETER600 GPM
10" DIAMETER900 GPM
12" DIAMETER1400 GPM

WARNING: EXCEEDING THESE FLOW RATES MAY CAUSE PREMATURE CLOSING.

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