If you have a multi story building and with 40 psi water pressure coming in at what height do you put a booster pump?
This depends on what your target pressure is.
If the height of the pipe is H in feet, the pressure at the bottom of the pipe from the column of water is 0.036127292 * H * 12 where 0.036127292 is the density of water in lbs/in^3. Thus, if your initial water pressure is I, the pressure at H feet will be I - 0.036127292 * H * 12
So you will have
Height | Pressure
0 ft | 40 psi
10 ft | 35 psi
20 ft | 31 psi
30 ft | 27 psi
40 ft | 23 psi
50 ft | 18 psi
60 ft | 14 psi
70 ft | 10 psi
80 ft | 5 psi
90 ft | 1 psi
100 ft | 0 psi
One will be required above 90 ft. You'll probably want one above 40 ft.
Derivations: eq means equals. This wiki eats equals signs.
D eq diameter of the pipe in inches, H eqheight in feet
D / 2 eq R
Area (A)(in^2) eq pi * R ^ 2
Volume (V)(in^3) eq A * H * 12 eq pi * R ^ 2 * H * 12
Water weight (W)(lbs) eq V * 0.036127292 eq pi * R ^ 2 * H * 12 * 0.036127292
Pressure (P)(psi) eq W / A eq V * 0.036127292 eq pi * R ^ 2 * H * 12 * 0.036127292 / pi * R ^ 2 eq H * 12 * 0.036127292
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