Vacuum Pipes - Velocities

Air velocities in vacuum pipes can be estimated with the diagrams below.

Standard and Actual Air Volume - cfm

The diagram is calculated for steel pipes schedule 40.

• Vacuum in %, torr, mm Mercury, psi and kPa

Example - Estimating the Vacuum Air Flow Velocity

Velocity in a NPS 3" steel pipe with standard air volume flow 100 scfm at 30% vacuum can be estimated to approximately 3000 fpm as indicated in the diagram below:

Standard and Actual Air Volume - l/s

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