What size supply pipe must be used from a 5000 litre water tank to supply 4 bars of pressure to a house that is 20m below and 300m away from the tank?
Plumbing – Water Supply pressure
plumbing
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Best Answer
It's a trick question, you can never get 4 bar of pressure with only a 20 m head.
The pressure due to a vertical column of liquid is equal to the density x height of the column x the acceleration due to gravity (little g = 9.8 m/s2).
Your height is 20m
Density of water is 1000 kg/m3
g = 9.8
So, pressure is 196,000 Pascals
100,000 Pascal per bar, so you have 1.96 bar as the max pressure you could get, independent of flow rate or pipe size.