1. What is a Pipe Size Calculator from Flow Rate?

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

Purpose: It helps engineers, plumbers, 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 Proper Pipe Sizing

Details: Correct pipe sizing ensures efficient flow, prevents excessive pressure drops, avoids erosion damage, and maintains system performance.

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 supply lines, 5-10 ft/s for drainage.

Q2: How does pipe material affect the calculation?
A: Material affects friction loss but not the basic diameter calculation shown here.

Q3: Can I use this for gases or other fluids?
A: Yes, but adjust velocity limits based on fluid properties and application.

Q4: What if I get a very small diameter?
A: Consider minimum practical sizes and check velocity doesn't exceed maximum recommended values.

Q5: How do I convert the result to inches?
A: Multiply the result by 12 (1 foot = 12 inches).