Fluid Velocity Calculator
v = Q / A. Calculate fluid velocity from volumetric flow rate and pipe inner diameter.
Velocity
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ft/s
Velocity
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m/s
Pipe Area
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in²
Flow Rate
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ft³/s
How this was calculated
v = Q / A
A = π(D/2)² where D is inner diameter.
1 gpm = 0.002228 ft³/s. v(ft/s) = Q(ft³/s) / A(ft²).
Typical pipe velocities: liquids 3-10 ft/s, gases 30-100 ft/s.
Need help with piping design, flow assurance, or hydraulic analysis?
Book a free strategy call →Understanding Fluid Velocity in Pipes
Fluid velocity is a critical parameter in piping system design. Too low a velocity causes settling of solids and slugging; too high causes erosion, vibration, and excessive pressure drop.
In oilfield applications, API RP 14E provides guidelines for maximum erosional velocity: Ve = C / sqrt(rho), where C typically ranges from 100-150 for continuous service.
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