1. What is Pipe Diameter Calculation from Flow Rate?

Definition: This calculator determines the required pipe diameter based on the flow rate and fluid velocity.

Purpose: It helps engineers and designers select the appropriate pipe size for fluid transport systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( D \) — Pipe diameter (feet)
• \( Q \) — Flow rate (gallons per minute)
• \( V \) — Fluid velocity (feet per second)
• \( \pi \) — Pi (approximately 3.1416)
• 7.481 — Conversion factor (gallons to cubic feet)

Explanation: The formula calculates the minimum pipe diameter needed to maintain the desired flow rate at the specified velocity.

3. Importance of Pipe Diameter Calculation

Details: Proper pipe sizing ensures efficient fluid transport, prevents excessive pressure drops, and avoids velocity-related issues like water hammer or erosion.

4. Using the Calculator

Tips: Enter the flow rate in GPM and desired velocity in ft/s (default 5 ft/s for water). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical velocity for water in pipes?
A: For water, 3-5 ft/s is common for general applications, up to 10 ft/s for non-critical systems.

Q2: How does pipe material affect the calculation?
A: The material affects friction loss but not the basic diameter calculation. However, you should select standard pipe sizes above the calculated diameter.

Q3: Can I use this for gases or other fluids?
A: Yes, but ensure proper velocity ranges for the specific fluid (typically lower for gases).

Q4: What if I get a very small diameter?
A: Consider minimum practical pipe sizes and check velocity isn't too high for your application.

Q5: How does temperature affect the calculation?
A: Temperature affects fluid viscosity and density, but this simple calculator assumes water-like properties.