1. What is the Water GPM from PSI Equation?

The GPM (gallons per minute) from PSI equation calculates water flow rate based on pipe diameter and pressure. It's commonly used in plumbing, irrigation, and fire protection systems to estimate water flow.

2. How Does the Calculator Work?

The calculator uses the equation:

Where:

• \( GPM \) — Flow rate in gallons per minute
• \( d \) — Diameter of the pipe (inches)
• \( PSI \) — Pressure in pounds per square inch

Explanation: The equation shows that flow rate increases with the square of pipe diameter and with the square root of pressure.

3. Importance of Flow Rate Calculation

Details: Accurate flow rate estimation is crucial for designing water systems, selecting pump sizes, and ensuring adequate water supply for various applications.

4. Using the Calculator

Tips: Enter pipe diameter in inches and pressure in PSI. All values must be valid (diameter > 0, PSI > 0).

5. Frequently Asked Questions (FAQ)

Q1: What does the constant 5.45 represent?
A: This empirical constant accounts for unit conversions and typical water flow characteristics through circular pipes.

Q2: How accurate is this calculation?
A: It provides a good estimate for water at standard temperature through smooth pipes. Actual flow may vary due to friction, pipe material, and temperature.

Q3: Can this be used for other liquids?
A: No, this equation is specific to water. Other liquids would require adjustments for viscosity and density.

Q4: What's the typical GPM for household plumbing?
A: Standard household fixtures typically require 2-5 GPM, while whole-house systems may need 6-12 GPM depending on the number of fixtures.

Q5: How does pipe length affect the calculation?
A: This simplified equation doesn't account for pipe length. Longer pipes will have more friction loss, reducing actual flow rate.