Page 208 - Chemical process engineering design and economics

Compressors, Pumps, and Turbines 191

Table 5.1 Vacuum-Pump Characteristics

Single-Stage
Inlet
Vacuum Pump Type 3 Flow Rate" Compression Minimum
Suction
3
m /h Ratio Pressure 1
—— bai ———
Steam-Jet Ejector
One Stage 1 7.0-1. 7x1 0 6 6.0 0.1
Two Stages 0.016
Three Stages 1.3xlO~ 3
Four Stages 2.7x10"
Five Stages 2.7xlO~ 5
Six Stages 4.0x10-*
Positive Displacement
Rotary Piston
One Stage" 5.1-1.4xl0 3 l.OxlO 5 2.7xlO' 5
Two Stages UxlQ- 6
Rotary Vane
Dry Operation 30.0-l.OxlO 4 l.OxlO 5 6.7X10' 2
Oil Sealed 85.0-1.4xl0 3 UxlO' 3
Oil Sealed' (1 stage) 5.1-85.0 2.7xlO" 5
0
Oil Sealed (2 stages) 1.3xlO- 6
Rotary Blower
One Stage 51.0-5.1x10" 2.3 0.4
Two Stages 8.0xlO~ 2
Liquid Ring
Water Sealed (1 6 °C)
One Stage 51.0-5.1x10" 10.0 0.1
Two Stages 5.3xlO~ 2
Oil Sealed 1.3X10' 2
a) Source: Reference 3
3
b) To convert to ft /min multiply by 0.589.
c) Discharge pressure limited to 1.22 bar (1.20)
to convert to atm multiply by 0.987.
d) Maximum temperature = 370 K (666 °R)
e) Spring-loaded vanes

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