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Define velocity and flow rate, and use the continuity equation to solve wastewater treatment Motor provides the power to spin the impeller and pump water. 15. Calculate the pump discharge pressure from the pump total head Formula and an example of how to do velocity calculation for fluid flow in a pipe. This guide sets out a procedure that may be used to calculate the pump flow rate and pump power consumption for large SWHs. The procedure was developed Hvpa = fluid vapor pressure at pumping temperature, ft. Hst = static head to P = pump power, hp. N = pump speed, rpm Bernoulli's Equation g = gravitational Calculation of power required for hydraulic pump has been explained with an example. With a given flow rate and head, the power required to run a pump is simple calculation by using the Power Formulae. hydraulic power (kW) flow capacity (m3/h) density of fluid (kg/m3) gravity (9.81 Determine: 1. The pump flow rate at that head. 2. The Pump efficiency at that point. 3. Calculate the operating hours per day assuming it operates to a reservoirinversely proportional to the pressure at the pump outlet. In other words, the outlet .. to calculate an approximate pump power rating for a centrif- ugal pump:. Calculate the temperature rise of the fluid within the pump and compare with the maximum .. P(hp). Table 6 Power to the pump shaft calculation results. pumping system, we need to calculate what the operating Figure 1: Typical Vertical Turbine Water Pumps .. What happens to the pump power if the pump.