Pipe Velocity Calculator
Formula Application and Conversion
v = Q / A
Where A is the cross-sectional area of a circular pipe, calculated as: A = π d² / 4. Since 4 / π ≈ 1.273, the final formula simplifies to:
v = 1.273 × Q / d²
Where GMP = flow rate, and Inch = pipe inner diameter, so
v = 0.4084 × qgpm / din²
Pipe Flow Velocity Calculator
Enter values and click Calculate.
This formula is frequently used in the piping industry. You can use it to solve the following problems:
- Pipe sizing
- Flow velocity control (to prevent scouring or sedimentation)
- Pump selection
- Preliminary calculations for pressure drop estimation
This allows you to directly determine:
- Whether the flow velocity is appropriate for water or oil transport (typically within the 1–3 m/s range)
- Flow velocity control in ERW / LSAW / SSAW pipeline designs
- Whether scouring of the inner wall or sedimentation will occur
