Pipe DN Recommendation

System type automatically sets velocity limits. Fire systems require high velocity, heating requires low velocity.
Total flow rate through the pipe
Pipe material affects inner diameter and roughness
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Smart Diameter Selection

This calculator recommends the optimal pipe diameter based on your system type and flow requirements.<br/><br/> Each system has specific velocity limits: <ul> <li><b>HVAC:</b> 0.5-1.5 m/s (noise control)</li> <li><b>Fire:</b> 2.0-6.0 m/s (emergency response)</li> <li><b>Water:</b> 0.6-2.0 m/s (balanced)</li> <li><b>Compressed Air:</b> 6-12 m/s (high velocity OK)</li> </ul>

Key Points:
  • System-specific velocity limits
  • Automatic standard pipe selection
  • Alternative options provided
  • Head loss calculation included
Calculation Steps:
  1. Enter all required parameters
  2. Click "Update Calculation"
  3. Review results and analysis
Formula Variables:
D Diameter (mm)
Q Flow Rate (m³/h)
V Velocity (m/s)
Re Reynolds (-)
f Friction Factor (-)