1. What is Water Pressure at 125 GPM Calculator?

Definition: This calculator determines the water pressure generated when flowing at 125 gallons per minute (GPM) through a pipe of given area.

Purpose: It helps engineers and plumbers understand the pressure requirements for water systems operating at 125 GPM flow rate.

2. How Does the Calculator Work?

The calculator uses the formulas:

Where:

• \( P \) — Pressure (psi)
• \( V \) — Velocity (ft/s)
• \( \rho \) — Water density (lb/ft³)
• \( A \) — Pipe cross-sectional area (ft²)

Explanation: First calculates velocity from flow rate and area, then computes pressure using the dynamic pressure formula converted to psi.

3. Importance of Water Pressure Calculation

Details: Proper pressure calculation ensures adequate water supply, prevents pipe damage, and helps in selecting appropriate pipe sizes.

4. Using the Calculator

Tips: Enter the pipe area in square feet and water density (default 62.4 lb/ft³ for fresh water). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why 125 GPM specifically?
A: 125 GPM is a common flow rate for many residential and commercial applications, but the formula can be adapted for other flow rates.

Q2: What's a typical water density value?
A: Fresh water at 60°F is about 62.4 lb/ft³. Saltwater or hot water would have different densities.

Q3: How does pipe size affect pressure?
A: Smaller pipe areas result in higher velocities and consequently higher pressure drops.

Q4: Does this account for friction losses?
A: No, this calculates dynamic pressure only. For complete system analysis, include friction losses.

Q5: What's the 448.83 conversion factor?
A: It converts GPM to ft³/s (1 GPM = 0.002228 ft³/s, and 1/0.002228 ≈ 448.83).