Water supply pump sizing for residential, commercial, assembly , school, college, university buildings.
To size a water supply pump from an underground tank to an overhead tank, you need to consider factors such as the flow rate, pressure requirements, pipe friction losses, and the vertical distance between the tanks. Here are the general steps for pump sizing calculation:
Determine the required flow rate: Calculate the water demand based on the number of fixtures, peak usage, and desired flow rate. The flow rate is typically measured in gallons per minute (GPM) or liters per second (L/s).
Determine the required pressure: Determine the minimum pressure required at the highest point of the overhead tank. This value is often specified by plumbing codes or guidelines. It is typically given in pounds per square inch (psi) or meters of head.
Calculate the total dynamic head (TDH): TDH represents the total resistance or pressure that the pump needs to overcome. It is the sum of the vertical distance between the tanks, friction losses in the pipes, and any additional head losses due to fittings, valves, or other components.
Account for pipe friction losses: Calculate the friction losses in the pipe using an appropriate friction loss equation such as the Darcy-Weisbach equation or the Hazen-Williams equation. Consider the pipe length, pipe diameter, flow rate, pipe material, and fittings in the calculation.
Determine the pump head capacity: Add the vertical distance between the tanks (head), friction losses, and additional head losses to calculate the total pump head capacity required. This value is typically given in feet or meters of head.
Select an appropriate pump: Choose a pump that can provide the required flow rate and head capacity. Consider factors such as the pump curve, efficiency, power supply, and availability. Consult pump manufacturers' specifications and performance curves to select the right pump.
Account for safety factors and future growth: Consider safety factors and potential future increases in water demand when sizing the pump. It is generally recommended to provide a margin of safety by oversizing the pump or leaving room for future expansions.
It is important to note that pump sizing can be a complex process, and it is advisable to consult with a professionals like Kromatics.
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