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Ludwig's Applied Process Design for Chemical and Petrochemical Plants, 4th Edition by A. Kayode Coker, PhD

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Chapter 0 RULES OF THUMB: SUMMARY

COMPRESSORS, FANS, BLOWERS AND VACUUM PUMPS

1. Fans are used to raise the pressure by about 3% [12 in. (30 cm) water], blowers raise to less than 2.75 barg (40 psig), and compressors to higher pressures, although the blower range is commonly included in the compressor range.

2. For vacuum pumps use the following:

Reciprocating piston Type down to 133.3 Pa (1 torr)
Rotary piston type down to 0.133 Pa (0.001 torr)
Two lobe rotary type down to 0.0133 Pa (0.0001 torr)
Steam jet ejectors 1 stage down to 13.3 k Pa (100 torr)
  3 stage down to 133.3 Pa (1 torr)
  5 stage down to 6.7 Pa (0.05 torr)

3. A three-stage ejector needs 100 kg steam/kg air to maintain a pressure of 133.3 Pa (1 torr).

4.

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