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Measure the vertical distance from the top of the water in the tank to the point of use. Multiply that distance by 0.44 to get the answer in psi.

Example: if the top of the tank is 20 feet above the point of use, the water pressure at the point of use will be 8.8 psi.

Note, this does not account for friction losses in the pipe. If the pipe runs a long distance from the tank to the point of use, there will be pressure losses in the pipe, especially if the pipe is a small diameter. The larger diameter, the less those pressure losses will be.

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14y ago
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5mo ago

The pressure of gravity-fed water tanks depends on the height of the water column above the outlet. For every 2.31 feet of elevation, you gain 1 psi of water pressure. So, if your tank is 20 feet high, you would have approximately 10 psi of water pressure at the outlet.

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Q: What is thePressure of gravity fed water tanks?
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