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The fire fighting system pump head can be calculated using hazzan willam equation.
Step1
Identify the longest pipe route and water flow rate.
Step2
Calculate the losses in pipes, fittings, valves, equipment etc., in the longest path and add safety.
Steop3
Ensure that the inlet line has sufficient NPSH (Net positive suction head) added.
by calculating losses of fitting that installed at the pipe line and the vertical distance between thae farest sprinkler and pump room
