1. What is PSI from GPM and Pipe Diameter Calculator?

Definition: This calculator estimates the pressure (PSI) in a pipe system based on flow rate (GPM), pipe diameter, and fluid density.

Purpose: It helps engineers, plumbers, and fluid system designers determine the pressure generated by fluid flow through pipes.

2. How Does the Calculator Work?

The calculator uses the formulas:

Where:

• \( P \) — Pressure (psi)
• \( V \) — Velocity (ft/s)
• \( \rho \) — Fluid density (lb/ft³)
• \( Q \) — Flow rate (GPM)
• \( A \) — Cross-sectional area of pipe (ft²)

Explanation: The flow rate is converted to velocity, then the dynamic pressure is calculated based on the velocity and fluid density.

3. Importance of Pressure Calculation

Details: Proper pressure estimation ensures pipe systems are designed to handle the expected loads, preventing failures and ensuring efficient operation.

4. Using the Calculator

Tips: Enter the flow rate in GPM, pipe diameter in inches, and fluid density (default 62.4 lb/ft³ for water). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the 448.83 conversion factor?
A: This converts GPM to ft³/s (1 GPM = 0.002228 ft³/s) and adjusts for area units (1/448.83 ≈ 0.002228).

Q2: What's a typical fluid density for water?
A: Fresh water at 60°F is about 62.4 lb/ft³. Salt water is about 64 lb/ft³.

Q3: Does this account for pipe friction losses?
A: No, this calculates dynamic pressure only. For total system pressure, add static pressure and friction losses.

Q4: What velocity is considered good for water pipes?
A: Typically 4-8 ft/s for supply lines, 2-5 ft/s for drainage.

Q5: How does pipe diameter affect pressure?
A: Smaller diameters increase velocity at the same flow rate, resulting in higher dynamic pressure.