Example
Input: 50mm Pipe, 2m/s
Result: 14.1 m³/hour
Step-by-Step Guide
- Input Diameter: Internal pipe size (mm/in).
- Input Velocity: Speed of fluid (m/s).
- Calculate: Resulting Flow Rate.
What is Pipe Flow & Velocity Calculator?
Relates the volumetric flow rate (Q) to the cross-sectional area of the pipe (A) and the fluid velocity (V). Essential for plumbing and irrigation sizing.
👷 Builder's Tip: Measure twice, cut once. These calculations are theoretical; actual site conditions may affect requirements.
How it Works
Formula: Q = A * V.
Where Area = π * (Diameter/2)².
The tool allows solving for any variable if the other two are known.
FAQ
What is a safe velocity?
Typically 1.5 - 2 m/s for pressure lines, 1 m/s for suction.
ID vs OD?
Always use Internal Diameter (ID) for flow calcs.
Does pressure affect flow?
Indirectly; pressure overcomes friction to maintain velocity.
Gravity flow?
Use Manning's equation for partially full pipes (drains).
Units?
Be careful converting GPM to m³/h.
Conclusion
Managing velocity is crucial. Too high (>2m/s) causes noise and erosion; too low allows sediment buildup. Use this to size pipes correctly for pumps and gravity feeds.