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# Vacuum Pipes - Pressure Loss vs. Air Flow

Pressure drop in vacuum pipelines:

### Air Flow - scfm - and Pressure Drop - in Hg/100 ft

The diagram is based on initial vacuum pressure 20 in Hg (67% vacuum) and steel pipes schedule 40.

• 1 in Hg = 3.37 kPa
• 1 scfm = 0.472 nl/s

## Related Topics

### • Fluid Flow and Pressure Loss

Pipe lines - fluid flow and pressure loss - water, sewer, steel pipes, pvc pipes, copper tubes and more.

### • Gases and Compressed Air

Air, LNG, LPG and other common gas properties, pipeline capacities, sizing of relief valves.

## Related Documents

### Air - SCFM versus ACFM and ICFM

Actual air compressor capacity (ACFM) vs. standard air capacity (SCFM) and inlet air capacity (ICFM).

### Inches vs. Feet, Yards and Meters - Conversion Chart

Convert between inches, feet, yards and meters.

### Vacuum

Vacuum is defined as air pressure below atmospheric pressure.

### Vacuum - Air Expansion Ratio

Convert vacuum air volume to standard air volume

### Vacuum - Evacuation Time

Vacuum pumps - calculate flow rate and required evacuation time.

### Vacuum - Flow Measurement

Measure air volume flow in vacuum.

### Vacuum - Pressure Units Converter

Converting between vacuum units like % vacuum - mm Mercury - psi - torr - micron - kPa.

### Vacuum Pipes - Flow Velocities

Air velocity diagrams for vacuum pipe lines.

### Vacuum Pumps - Exhaust Pipe Capacities

Capacities of vacuum pump exhaust pipes.

### Water - Boiling Points at Vacuum Pressure

Online calculator, figures and tables giving the boiling temperatures of water in varying vacuum, SI and Imperial units.

### Water vs. Steam - Critical and Triple Points

Critical point is where vapor and liquid are indistinguishable and triple point is where ice, water and vapor coexist in thermodynamic equilibrium.

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