HALE AP, Technical Manual

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C-1
APPENDIX C.
ANCILLARY PUMP EQUIPMENT
In addition to the basic parts of Hale booster pumps described above, the following items are
available to enhance pump operation:
•
Priming Systems
•
Temperature Control Devices
C.1. PRIMING SYSTEMS
Priming pumps are used to evacuate air in the suction hose and the pump. The vacuum created
allows atmospheric pressure to push water from the static source through the suction hose and
into the pump. Hale booster pumps use Rotary Vane Positive Displacement type pumps for prim-
ing. See Figure 50.
Figure 51. Rotary Vane Positive Displacement Type Priming Pump
C.1.1 Priming Pump
A priming pump draws air out of the pump body and suction piping allowing water to enter. The
priming pump has a rotor mounted off-center (eccentric) to the housing. The eccentric position
creates a large gap (air space) at the suction inlet which decreases to no gap (air space) at the
discharge outlet. The vanes in the rotor slide in grooves and are held against the housing by cen-
trifugal force. As each vane turns toward the discharge outlet, it recedes into the rotor as the air
space decreases compressing the air and forcing it out the discharge. As the rotor continues past
the discharge point, the vanes move outward in the grooves remaining against the housing to
catch more air at the suction inlet to begin the next cycle. See Figure 50 and Figure 51.