The general formula is:
Feet elevation divided by 2.31 equals PSI · · (Pounds per Square Inch)
i.e.
Ft Elevation / 2.31 = XX PSI
Example
A storage tank 46.2 feet
above the ground
The calculation -
46.2 / 2.31 = 20 psi
The amount of water in the reservoir has absolutely no affect on the pressure that it exerts
o The only determining factors are:
· Depth (Water Column or Height)
Water density
· (determined by altitude & temperature)
Example:
Fresh Water is based at 0.43 psi per foot of depth
Sea Water is based at 0.44 psi per foot of depth
The water pressure at a fresh water dam 100 feet deep is 43.3 psi
The pressure is the same whether the reservoir is 10 feet long or 25 miles long.
The beauty of an elevated water tank is that there is no mechanical aid needed to flow the water from the tank. You don't need electricity or other means to operate a pump to flow water.
Storage Tanks, Elevation and Natural (non-assisted pressure)
Water pressure at the outlet is determined by several factors
o Located at the bottom of a tank
o The temperature of the water
· Changes its specific gravity
o The height of the water column
· How high above the outlet (spigot) the
· water is exiting the tank
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