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Pipe Velocity Calculator Sizing

Pipe Velocity Formula:

\[ v = \frac{Q}{\pi \times r^2} \]

m³/s
meters
m/s

1. What is a Pipe Velocity Calculator?

Definition: This calculator determines the fluid velocity in a pipe based on the flow rate and pipe radius.

Purpose: It helps engineers and plumbers ensure proper flow characteristics in piping systems.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ v = \frac{Q}{\pi \times r^2} \]

Where:

  • \( v \) — Velocity (meters per second, m/s)
  • \( Q \) — Flow rate (cubic meters per second, m³/s)
  • \( r \) — Pipe radius (meters, m)
  • \( \pi \) — Pi (approximately 3.1416)

Explanation: The flow rate is divided by the pipe's cross-sectional area (πr²) to determine the fluid velocity.

3. Importance of Pipe Velocity Calculation

Details: Proper velocity calculation ensures efficient flow, prevents erosion, and maintains system pressure requirements.

4. Using the Calculator

Tips: Enter the flow rate in m³/s and pipe radius in meters. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical pipe velocity range?
A: For water systems, 0.5-2.5 m/s is common, with 1-1.5 m/s often being ideal.

Q2: How do I calculate flow rate if I know velocity?
A: Rearrange the formula: \( Q = v \times \pi \times r^2 \).

Q3: Can I use diameter instead of radius?
A: Yes, just divide diameter by 2 to get radius before calculation.

Q4: Does this work for any fluid?
A: Yes, as long as you have the volumetric flow rate (not mass flow rate).

Q5: What if I have a rectangular pipe?
A: Use cross-sectional area (width × height) instead of πr² in the formula.

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