Page 103 - Root Cause Failure Analysis
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94 Root Cause Failure Analysis
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Figure 7-10 ?bo-screw, low-pitch screw pump.
of liquid in opposed streams toward the center, thus eliminating hydraulic thrust. The
removal of liquid from the suction end by the screws produces a reduction in pressure,
which draws liquid through the suction line.
Vane
The sliding-vane pump shown in Figure 7-1 1, another type of positive-displacement
pump, is used with viscous fluids. It consists of a cylindrical bored housing with a
SwingingType
&loving vane
Figure 7-11 Lobe-type pump (Mobley 1989).
