Hale Q Series Muscle - Manual (Page 20)

 Introduction
20 MUSCLE (Midship) Pumps Installation, Operation, and Maintenance Manual
p/n: 029-0020-63-0
 FLOW If the pressure (kPa) is held constant, the flow increases with an increase
in the speed of rotation. Flow is measured in the number of gallons of fluid per
minute (GPM or LPM) that a pump can deliver when supplied from draft.
A centrifugal pump has the ability to fully utilize any positive suction inlet pressure,
reducing the amount of work done by the pump.
For example, if the required discharge pressure is 120 PSI (827 kPa) and the inlet
pressure is 45 PSI (310 kPa), the pump must only produce the difference in pressure
or 75 PSI (517 kPa). This contributes to improved performance with reduced mainte-
nance. Additionally, decreased maintenance is aided by a centrifugal pump having
few moving parts.
Pump Stages
The number of impellers on a common shaft determines the number of pump stages.
The Hale single-stage pumps provide the same normal operating and rating test pres-
sures as the Hale two-stage pumps. The two-stage pump provides an additional level
of operating pressures if required.
Single-Stage
Hale single-stage pumps use a one (1) impeller to develop the required volume and
pressure. (See Figure 2-2: “Water Flow, Typical Hale Single-Stage Pump.”)
Figure 2-2: Water Flow, Typical Hale Single-Stage Pump