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10 Ιουλ 2023 · Calculating the head of a submersible pump is crucial to ensure efficient and effective pumping. Following the step-by-step guide, you can determine the total head required for your pumping needs. Factors such as the pump’s capacity, pipe diameter and length, and the depth of the water source can affect the head calculation.
26 Σεπ 2019 · The submersible pump stage calculation tells you how many stages are required. You find it by dividing the total dynamic head (TDH) by the length of each stage. The TDH is the equal to the sum of the pumping level, head length, drop pipe friction loss and check value friction.
Calculate the total head and select the pump. Calculate the NPSH available and check with respect to the NPSH required. Calculate the specific speed and predict the pump efficiency. Calculate the suction specific speed and Thoma number and check the prediction of the Thoma number regarding cavitation.
Example: (This example is for a submersible bore pump) 1 – Static Head = from the ‘Pump Set Depth’ to the discharge pipework outlet at its highest point. Let’s say as an example it is 45 metres (35m below ground and 10m above ground).
To determine field head and overall pump efficiency: a. Field Head = laboratory head minus total friction loss. (1) Total friction loss = loss in drop pipe + check valve(s) b. Overall Pump Efficiency = Water HP x (motor eff. % - cable loss %) Laboratory H.P. c. Water Horsepower = GPM x Head 3960 d. Laboratory Horsepower = GPM x Head x Sp. Gr.
2 Οκτ 2017 · Since a submersible pump motor is an induction motor, its speed is proportional to the frequency of the electrical power supply. This relationship between variables involved in pump performance (such as head, flow rate, shaft speed) and power is known as “Affinity Laws” (also called “Pump Laws”).
To calculate the size of a submersible pump, you need to determine the required flow rate (measured in gallons per minute) and calculate the Total Dynamic Head (TDH), which includes factors like vertical lift, service pressure, pumping level, and friction loss.
