Page 176 - Chemical Process Equipment - Selection and Design

148 FLUID TRANSPORT EQUIPMENT

Gas in
Figure

Discharge port

\Drive shaft
Pressure Rise ,%
(a) (b)

.G 140
x
130
ca
5 120
W
8 80
5 70
60
t
50
2 40
2 30
e
1000 2000 3000 4000 5000 6000 7000
Viscosity in Seconds,Saybolt Universal
(d)
Figure 7.19. Some rotary positive displacement compressors. (a) A two-lobe blower. (b) Performance of a two-lobe blower
(Roots-Connersuille Co.). (c) A screw pump with one power and two idle rotors (Kristal and Ann&, 1940). (d) Performance of 3.5" screw
pump handling oils at 1150 rpm against 325 psig (Kristal and Annett, 1940). (e) Principle of the liquid ring seal compressor (Nash Engineering
Co.). (f) A sliding vane blower (Beach-Russ Co.).