IES
Mechanical EngineeringP0

Pipe Velocity Calculator

Calculate fluid velocity in a pipe from flow rate and pipe diameter.

Inputs
Enter your values below
Result
Flow Velocity
—
Enter values and click Calculate
Formula
flow ÷ (π × (diameter ÷ 2)²)
Result unit: m/s

v = Q / A where A = π(D/2)². Flow rate in m³/s, diameter in m, result in m/s. Typical liquid velocity: 1-3 m/s.

Introduction

Calculate fluid velocity inside a pipe. For liquid lines, recommended velocity is 1-3 m/s; for gas lines, 10-30 m/s; for suction lines, under 1.5 m/s to avoid cavitation.

Calculation Example

100 m³/h through 150mm pipe gives 1.57 m/s velocity.

Inputs: flow=100, diameter=150
Result: 1.57 m/s

Engineering Applications

  • •Pipe sizing
  • •Pump system design
  • •Hydraulic calculations
  • •Flow measurement

Frequently Asked Questions

What is a good pipe velocity for water?

1-2 m/s for general water service, 0.5-1.5 m/s for pump suction, and up to 3 m/s for short discharge runs.

Why does velocity matter?

Too high causes erosion, noise, and high pressure drop. Too low means oversized pipe and higher cost, plus sediment deposition in slurry service.

Related Calculators

Pipe Flow CalculatorReynolds Number CalculatorPressure Drop Calculator (Darcy-Weisbach)

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Disclaimer: Calculations are for reference and educational purposes only. Always verify results independently for engineering design. See full disclaimer.