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NFPA may help
Measure the head(Delivery-Suction),
Calculate power(Can get it from the motor),
Calculate Friction losses,
Then Power=QXHXDensityxg,
Q=Water flow
which is pumped to the pipes. Then by the following formula the velocity can be calculated: Mass flow = Density * Velocity * Pipe Area
(G) Calculate your “Total Pressure Head” and enter it on your Design Data Form. Now for the flow formula: Multiply the pump Horsepower times 2178 (a constant value) and then divide by the Total Pressure Head in feet. So for the example with a 2 h.p.
Each figure can be calculated using simple math. How the concepts are developed is explained below. The engine pressure is calculated by plugging numbers into each figure and adding or subtracting them.
.D2√P (D = nozzle diameter; √P = square root of pressure)
For example, a one-inch smooth bore tip will have a discharge of gpm:. × ×7. = gpm.
Power=QXHXDensityxg,
Q=Water flow
H= Head
g= Gravity
i couldnt find the anser, but i want a detailed answer if anyone is willing to chat online and discuss.