Hale SMR - Manual (Page 25)

Stainless Max Series Pumps 2-11
Introduction
The gearbox cooler circulates pump water to transfer heat from the
gearbox oil to the pump discharge. It is standard equipment on
pumps with a capacity of 750 GPM (2,839LPM) or greater and
optional equipment on all other pumps.
Priming Systems
Priming pumps are used to evacuate air in
the suction hose and the pump. The
vacuum created allows atmospheric pres-
sure to push water from the static source
through the suction hose and into the
pump.
Note: Hale SM series pumps use Rotary Vane
Positive Displacement type pumps for priming. (See Figure 2-11:
“ESP Priming Pump.”) Also see Figure 2-12: “Rotary Vane Priming
Pump.”
A priming pump draws air out of the pump body and discharge
piping allowing water to enter. The priming pump has a rotor
mounted off-center (eccentric) to the pump body housing. The
vanes in the rotor slide in
grooves and are held
against the body housing
by centrifugal force. As a
vane turns toward the
discharge, it recedes into
the rotor compressing the
air. As the rotor continues
past the discharge, the
vane advances outward
from the groove and
against the body housing.
During this cycle, the
space between the rotor
and housing case fills with
air. The vanes, acting as
wipers, force air out of the
discharge, creating a
vacuum in the main pump allowing atmospheric pressure to push
water into the hose and suction side of the pump.
The Hale ESP series priming pump is an environmentally friendly
primer that does not require a separate lubricant reservoir. The
vanes and pump body are self-lubricating for maintenance free
operation.
Figure 2-11: ESP
Priming Pump
Figure 2-12: Rotary Vane Priming Pump
Suction
Discharge
Rotor
Vanes
Ground to
Chassis