In considering the amount of water to be stored two important considerations are: 1) the rate of water yield from the source, and 2) is a reserve for fire fighting purposes desired.
If the water source provides plenty of water to meet the peak demand, then not much storage will be required. Either pressure-cell or a pressure tank installation may be used, and the pump will be able to take care of extra demands.
If the well or spring has a limited yield, intermediate storage is required.
PRESSURE TANK SELECTION CHART | ||||||
---|---|---|---|---|---|---|
Pressure-switch Settings pounds per square inch | ||||||
Pump Capacity gal per min | 20-40 | 30-50 | 40-60 | 50-70 | 60-80 | 70-100 |
Pressure-tank Sizes gallons | ||||||
4 | 42 | 82 | 120 | 120 | 120 | 120 |
8 | 82 | 120 | 180 | 220 | 315 | 315 |
12 | 120 | 180 | 220 | 315 | 315 | 315 |
15 | 144 | 220 | 315 | 525 | 525 | 525 |
18 | 180 | 315 | 315 | 525 | 525 | 525 |
24 | 220 | 315 | 525 | 525 | 1000 | 1000 |
32 | 315 | 525 | 525 | 1000 | 1000 | 1000 |
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