Hale Q Series Muscle - Manual (Page 24)

 Introduction
24 MUSCLE (Midship) Pumps Installation, Operation, and Maintenance Manual
p/n: 029-0020-63-0
For example, if the inlet pressure is 30 PSI (207 kPa) and the flow of each impeller is
500 GPM (1,892 LPM) at 150 PSI (1034 kPa), the pressure and volume at the dis-
charge is: 180 PSI (1241 kPa).
Pressure (Series) Operation
For Pressure operation the impellers are connected in series. The output of the impel-
ler supplied from the pump intake is added to the input of the next impeller. (See Fig-
ure 2-6: “Two-Stage Pump PRESSURE Operation.”).
Figure 2-6: Two-Stage Pump PRESSURE Operation
The pressure at the pump discharge is the sum of the pressure of the two impellers,
plus the pressure of the intake. The amount of water delivered to the discharge is the
same amount that entered the first impeller. Using the preceding example, when in
series operation, the discharge pressure is 330 PSI, (2275 kPa) and the discharge
volume is 500 GPM (1,892 LPM)
Volume vs. Pressure Operation
Selection of volume versus pressure operation is determined by three factors:
 Generally, the pump should be operated so that the it provides the desired perfor-
mance at the LOWEST engine speed.
 Set to VOLUME (parallel) operation for higher flows. (See Figure 2-4: “Two-Stage
Pump VOLUME Operation” on page 22.)
 Set to PRESSURE (series) operation when higher water pressures are required.
(See Figure 2-6: “Two-Stage Pump PRESSURE Operation” on page 24.)