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228 Chapter 5

lesser extent. Some characteristics of electric motors, steam, and gas turbines are
listed in Table 5.9.

Table 5.9: Characteristics of Compressor and Pump Drivers

Driver 3 Power Range d Speed rpm SpeedControl Efficiency
hp

Squirrel Cage 1 to 5,000 3600/N (less 2%) Constant 10hp-86%
e
Induction Motor N = 1 to 8 Speed 100hp-91%
l,OOOhp-94%
Wound Rotor 1 to 1,500 3,550-1,750-1,150 100 to 60% 10hp-86%

Induction Motor 870 - 700 - 580 100hp-91%
1,500 to 2,500 1,750-1,150-870 100 to 60% l,OOOhp-94%

Synchronous 100 to 20,000 3600/N Constant 90 to 97
Motor Speed
Steam Turbine 10 to 20,000 2,000 to 15,000 100 to 35% r| A =50to76%
(all)
Single Stage b up to 1,000 1,000 to 7,000

High Back 150 to 3, 000 5,000 to 10,000
Pressure 5
Single or
Multistage
Multistage 15
Medium 750 to 5,000 up to 10,000
Large 5,000 to 60,000 3,000 to 16,000

Gas Turbine 0 3,000 to 20,000 10,000
a) Source: Reference 24 except where indicated. e) N is the number of poles.
b) Source: Reference 26.
c) Simple cycle.
d) To convert to kW multiply by 0.7457.

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