1. What is the GPH to PSI Formula?

The GPH to PSI formula converts gallons per hour flow rate to pounds per square inch pressure, accounting for pump head and efficiency. It's essential for hydraulic system design and pump performance analysis.

2. How Does the Calculator Work?

The calculator uses the GPH to PSI equation:

Where:

• \( GPH \) — Flow rate in gallons per hour
• \( Head \) — Total dynamic head in feet
• \( Efficiency \) — Pump efficiency as decimal (0.0-1.0)
• 3960 — Conversion constant (ft·lb/min per HP)

Explanation: The equation converts volumetric flow rate to pressure by considering the energy required to move fluid against gravity and system resistance.

3. Importance of PSI Calculation

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

4. Using the Calculator

Tips: Enter GPH (must be >0), Head in feet (must be >0), and Efficiency as decimal (0.01-1.0, default 0.85). All values must be valid positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical pump efficiency value?
A: Centrifugal pumps typically range 0.7-0.9 (70-90%). Positive displacement pumps can exceed 0.9.

Q2: Why is 3960 the conversion constant?
A: It combines unit conversions: 1 HP = 550 ft·lb/sec = 33,000 ft·lb/min, and 1 gallon water ≈ 8.34 lb → 33,000/8.34 ≈ 3960.

Q3: Does this account for pipe friction?
A: No, the head input should include all system losses (static head + friction head).

Q4: Can I use this for fluids other than water?
A: This formula is specific to water. For other fluids, you'd need to account for different densities.

Q5: What's the relationship between GPM and GPH?
A: GPM × 60 = GPH. This calculator uses GPH, so convert if you have GPM measurements.