1. What is the Well Pump Flow Rate Equation?

The well pump flow rate equation calculates the theoretical flow rate of a pump based on its physical characteristics and operating conditions. This helps determine appropriate pump sizing for water well applications.

2. How Does the Calculator Work?

The calculator uses the pump flow rate equation:

Where:

• \( Q \) — Flow rate (m³/s)
• \( D \) — Diameter of the pump (meters)
• \( n \) — Rotational speed (revolutions per second)
• \( H \) — Total dynamic head (meters)
• \( g \) — Acceleration due to gravity (9.81 m/s²)

Explanation: The equation calculates the theoretical maximum flow rate based on pump dimensions and operating conditions.

3. Importance of Pump Sizing

Details: Proper pump sizing ensures efficient operation, prevents overworking the pump, and matches the water demand of the household or application.

4. Using the Calculator

Tips: Enter the pump diameter, rotational speed, total dynamic head, and gravity (default is 9.81 m/s²). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical flow rate for residential well pumps?
A: Most residential well pumps deliver between 5-20 gallons per minute (GPM), depending on household needs.

Q2: How does head affect pump performance?
A: Higher head (vertical lift + friction loss) reduces the effective flow rate of the pump.

Q3: What's the relationship between diameter and flow rate?
A: Flow rate increases with the square of the diameter - doubling the diameter quadruples the flow rate.

Q4: Why is speed important in pump sizing?
A: Higher rotational speeds increase flow rate but may reduce pump life due to increased wear.

Q5: How accurate is this theoretical calculation?
A: This provides a theoretical maximum - actual flow rates will be lower due to efficiency losses and system restrictions.