1. What is a Pipe Flow Rate Calculator?

Definition: This calculator estimates the volumetric flow rate of liquid through a circular pipe based on the pipe's radius and flow velocity.

Purpose: It helps engineers, plumbers, and technicians determine liquid flow rates in piping systems for design and analysis purposes.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Volumetric flow rate (L/s)
• \( r \) — Pipe radius (m)
• \( V \) — Flow velocity (m/s)
• \( \pi \) — Mathematical constant (~3.14159)

Explanation: The cross-sectional area of the pipe (πr²) is multiplied by the flow velocity to get flow rate in m³/s, then converted to L/s.

3. Importance of Flow Rate Calculation

Details: Accurate flow rate estimation ensures proper pipe sizing, system performance, and compliance with design specifications.

4. Using the Calculator

Tips: Enter the pipe radius in meters and flow velocity in m/s. All values must be > 0. Results are given in liters per second (L/s).

5. Frequently Asked Questions (FAQ)

Q1: What's a typical flow velocity in pipes?
A: For water systems, typical velocities are 0.5-2.5 m/s (1-2 m/s for optimal balance between friction loss and pipe size).

Q2: Can I use diameter instead of radius?
A: Yes, but you must divide diameter by 2 to get radius before calculation (radius = diameter/2).

Q3: Why is the result in L/s?
A: Liters per second is a common unit for flow measurement in UK plumbing and engineering applications.

Q4: Does this work for any liquid?
A: Yes, as long as you know the velocity. Note that viscosity affects velocity for different liquids at same pressures.

Q5: How accurate is this calculation?
A: This gives theoretical maximum flow. Actual flow may be less due to friction, pipe roughness, fittings, and other factors.