Pressure Calculation Worksheet#
Complete this worksheet for the most pressure-demanding lateral, print it and submit it to the City with the irrigation plan.
| a. Pressure available at point-of-connection | psi | ||
| b. Pressure loss through the meter | - | psi | |
| c. Pressure loss through the backflow prevention device | - | psi | |
| d. Pressure loss in mainline pipe from backflow prevention device to remote control valve | - | psi | |
| e. Pressure loss through remote control valve | - | psi | |
| f. Pressure loss in lateral pipe form remote control valve to most remote sprinkler | - | psi | |
| g. Elevation change from point-of-connection to most remote sprinkler (0.43 psi per foot of elevation, (+) if sprinkler is lower, (-) if sprinkler is higher) | +/- | psi | |
|
h. Miscellaneous losses through other valves, strainers, etc. (in some cases, this will not be applicable) |
- | psi | |
| i. Total possible pressure loss (total of b through h) | - | psi | |
| j. Remaining pressure (subtract i from a) | psi | ||
| k. Minimum pressure required at sprinkler | psi | ||
| l. Difference (subtract j from k)* | psi |
If value of l. is negative, a booster pump may be needed. If the value is more than +15 psi, pressure reduction may be necessary for this and/or other zones.
Did You Know?
Replacing older water heaters, air conditioners, furnaces and boilers with efficient ENERGY STAR® models can save energy and increase home comfort.
Even small projects like planting a shrub require you to plan before digging. Know what’s below. Call 811 before you dig.
The fireplace damper and doors should be closed when not in use. It prevents warmed or cooled air from easily escaping the house.