Submersible Pump Calculations

Calculating the specifications for a submersible pump involves several factors to ensure the pump's performance meets the requirements of your specific application. Here are the key parameters and steps involved in submersible pump calculations:
1. Total Dynamic Head (TDH): TDH is the total resistance or pressure that the pump needs to overcome to deliver water from the source to the destination. It is the sum of the following components:

• Vertical Lift: The height from the water source (well) to the discharge point.
• Friction Loss: The resistance due to water flow through pipes, fittings, and other components.
• Elevation Changes: Any changes in elevation between the source and discharge point.

2. Flow Rate (Q): The desired rate at which water needs to be pumped, usually measured in gallons per minute (GPM) or liters per second (L/s).
3. Pump Efficiency (η): The efficiency of the pump, usually expressed as a percentage. It indicates how effectively the pump converts input power into hydraulic power.
4. Suction Lift (if applicable): If the pump is used for lifting water from a lower level, consider the suction lift, which is the vertical distance between the water level and the pump's intake.
5. Specific Gravity (if applicable): For applications involving fluids other than water, consider the specific gravity of the fluid.

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​Steps to Calculate Submersible Pump Specifications:

Calculate Total Dynamic Head (TDH):

• TDH = Vertical Lift + Friction Loss + Elevation Changes
• Determine Required Flow Rate (Q):
  • Calculate the desired flow rate based on your application requirements. This could be influenced by factors such as water demand, irrigation needs, or industrial processes.

Select a Pump:

• Consult the pump manufacturer's specifications and performance curves to choose a pump that can provide the required flow rate and TDH.
• The performance curves show the pump's flow rate at various TDH values, helping you select the appropriate pump model.

Check Suction Lift:

• If you have a suction lift (pumping from a lower level), ensure the selected pump is capable of handling the required lift.

Calculate Pump Power Requirement:

• Pump Power (P) = (Flow Rate × TDH) / (Η × 3,960)
•  3,960 is a constant that converts the units (GPM and feet) to horsepower.
• Check Horsepower Rating:
  • Ensure the pump's horsepower rating is sufficient to handle the calculated pump power requirement.

Electrical Requirements:

• Verify that the electrical supply at the installation site can provide the required voltage and current for the pump.
• Consider Pump Control:
  • Depending on the application, you may need to install a control box, pressure switch, or other components to regulate the pump's operation.

It's important to note that these calculations provide a basic framework for selecting a submersible pump. Depending on the complexity of your application and specific conditions, you may need to consider additional factors, such as pump efficiency variations at different operating points, motor protection, and safety measures.
Always refer to the pump manufacturer's documentation and guidelines for accurate and detailed pump selection and installation instructions. If you're unsure, consider consulting a professional engineer or pump specialist to ensure the proper selection and installation of the submersible pump for your specific needs. For more info contact ebara pump suppliers in uae or call us at +971 4 252 2966.