| 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. |
| VALVE SIZE | (MAX) FLOW RATE |
|---|---|
| 4″ DIAMETER | 160 GPM |
| 4″ DIAMETER | 160 GPM |
| 6″ DIAMETER | 360 GPM |
| 8″ DIAMETER | 600 GPM |
| 10″ DIAMETER | 900 GPM |
| 12″ DIAMETER | 1400 GPM |
PVC models are the most economical way to prevent bulk hydrocarbon spills. Corrosion resistant PVC construction is an ideal choice for warm climates.
Used in lieu of PVC units in colder climates, which may eliminate the necessity for an electric freeze protection package.
The best option if fire is possible. By extending the pipe thru the sump wall, there is no connection inside the sump to burn and fail.
For over 40 years AFL has supplied high quality, durable environmental systems to virtually every large industrial, utility and transportation company in the U.S.A. along with many military bases across the world. AFL is truly ‘engineering a better environment’. For a quote on your next project, contact us today!
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