Free Pipe Velocity Calculator
Find the average flow velocity inside a pipe given the volumetric flow rate and pipe diameter.
L/s
mm
Average Velocity
1.91 m/s
Average Velocity vs Volumetric Flow Rate (Q)
Pipe Flow Velocity
Velocity is derived from the continuity equation by dividing flow rate by cross-sectional area.
Formula
V = Q / A = 4 Q / (pi D^2)
where Q is the volumetric flow rate and D is the pipe inner diameter. Maintaining velocities within recommended ranges (1-3 m/s for water) avoids excessive pressure loss and erosion.
Example Calculation
15 L/s flowing through a 100 mm diameter pipe.
- 01Q = 15 L/s = 0.015 m^3/s
- 02A = pi x 0.1^2 / 4 = 0.007854 m^2
- 03V = 0.015 / 0.007854 = 1.91 m/s
Frequently Asked Questions
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