Water Pump quick sizing

To calculate the size of a water pump based on temperature, flow, pump efficiency by type, and total required head, you can follow these steps:

1. Determine the required flow rate (Q) of water in liters per minute or cubic meters per hour. This can be based on the demand of the system or application that the pump is serving.

2. Determine the required total head (H) of the system in meters or feet. This can be based on the height difference between the source and the destination of the water, the frictional losses in the piping, and any other losses in the system.

3. Determine the density (ρ) of the water at the operating temperature. This can be obtained from tables or calculated using the appropriate equations of state.

4. Determine the desired pump efficiency (η) based on the type of pump being used. The efficiency of different types of pumps varies, so it is important to use the appropriate value for the specific type of pump.

5. Calculate the power (P) required to drive the pump using the following formula:

P = (Q * H * ρ) / (η * 3,600)

where P is the power required in kilowatts, Q is the flow rate in cubic meters per hour, H is the total head in meters, ρ is the density of the water in kilograms per cubic meter, η is the desired pump efficiency, and 3,600 is a conversion factor from seconds to hours.

6. Select a pump that can deliver the required power, based on its performance curve, which relates flow rate, head, and power consumption. The pump should have a power rating that is equal to or greater than the calculated power requirement.

7. Check that the selected pump is suitable for the operating temperature range of the system, and that it can handle any other specific requirements of the application, such as the presence of solids or corrosive substances.

Overall, calculating the size of a water pump requires a careful consideration of the flow rate, total head, pump efficiency, and other factors that affect the performance of the pump. By following the above steps, you can ensure that the pump selected is suitable for the specific requirements of the system or application.