1. What is the Well Pump Pressure Formula?

The well pump pressure formula calculates the pressure generated by a pump based on flow rate and system resistance. It follows the fundamental hydraulic principle: Pressure = Flow × Resistance.

2. How Does the Calculator Work?

The calculator uses the pressure formula:

Where:

• \( Flow \) — Water flow rate in gallons per minute (gpm)
• \( Resistance \) — System resistance in pounds per square inch per gallon per minute (psi/gpm)

Explanation: The formula calculates the pressure required to overcome the resistance in a piping system at a specific flow rate.

3. Importance of Pressure Calculation

Details: Accurate pressure calculation is crucial for proper pump selection, system design, and ensuring adequate water delivery throughout the plumbing system.

4. Using the Calculator

Tips: Enter flow rate in gpm and resistance in psi/gpm. Both values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is typical flow rate for residential well pumps?
A: Most residential well pumps deliver 5-20 gpm, depending on household size and water requirements.

Q2: How do I determine system resistance?
A: System resistance is calculated based on pipe diameter, length, fittings, elevation changes, and fixture requirements.

Q3: What pressure is needed for a standard home?
A: Most homes require 40-60 psi at the pressure tank for proper operation of fixtures and appliances.

Q4: Does pipe size affect resistance?
A: Yes, smaller diameter pipes create higher resistance to flow, requiring more pressure to maintain the same flow rate.

Q5: Should I include safety factors in my calculation?
A: Yes, it's recommended to add 10-20% to the calculated pressure to account for system aging and unexpected resistance.