1. What is the GPH to PSI Conversion?

The GPH to PSI conversion calculates the pressure (in pounds per square inch) generated by a pump based on its flow rate (in gallons per hour), head (in feet), and efficiency. This is important for understanding pump performance in hydraulic systems.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• \( GPH \) — Flow rate in gallons per hour
• \( Head \) — Total dynamic head in feet
• \( Efficiency \) — Pump efficiency as a decimal (0.0 to 1.0)
• 3960 — Conversion constant

Explanation: The formula converts the hydraulic power (flow rate × head) to pressure, accounting for the pump's efficiency.

3. Importance of PSI Calculation

Details: Accurate PSI calculation is crucial for proper pump selection, system design, and ensuring adequate pressure for various applications like irrigation, industrial processes, and water supply systems.

4. Using the Calculator

Tips: Enter GPH (must be > 0), Head in feet (must be > 0), and Efficiency as a decimal between 0.0001 and 1.0 (default is 0.85 for 85% efficiency).

5. Frequently Asked Questions (FAQ)

Q1: What is a typical pump efficiency value?
A: Most pumps operate between 50-85% efficiency. High-quality centrifugal pumps may reach 85-90% efficiency.

Q2: How does head relate to pressure?
A: Head (in feet) can be converted to PSI by dividing by 2.31 (for water at standard conditions).

Q3: Why is 3960 used in the formula?
A: 3960 is a conversion factor that accounts for unit conversions (550 ft-lb/sec per HP × 60 sec/min × 12 in/ft / 8.34 lb/gal).

Q4: Can this be used for any liquid?
A: The formula works for water. For other liquids, you'd need to account for specific gravity.

Q5: What if I know GPM instead of GPH?
A: Convert GPM to GPH by multiplying by 60 (since there are 60 minutes in an hour).