Vacuum Pipes - Velocities

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Air velocity 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 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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Related Topics

• Gas and Compressed Air - Gas properties, capacities of pipelines, sizing of relief valves - air, LNG, LPG and more

Related Documents

• Vacuum - Vacuum is defined as air pressure below atmospheric pressure
• Vacuum - Evacuation Time - Vacuum pumps - calculating flow rate and required evacuation time
• Vacuum - Expanded Air Ratio - Converting standard air volume flow to actual air volume flow
• Vacuum Pressure - Converting Units - Vacuum converting units - % vacuum - mm Mercury - psi - torr - micron - kPa
• Vacuum and Flow Measurement - Measuring volume flow in vacuum