Hale 2CBP - Manual (Page 7)

Introduction Sec I-3
Booster Pumps
Two-Stage Booster Pump
The Hale Two-Stage Booster Pump (2CBP)
has two impellers connected in series for high-
pressure operation. The output of the first
impeller is supplied to the intake of the second
impeller. This second impeller adds additional
pressure and directs the water to the discharge.
Since the two-stage booster pump only
operates in series, the final water pressure is
the inlet pressure plus the pressure added by
both impellers. The volume of water delivered
at the discharge, however, is the same. Figure
1-4 shows the flow of water through a Hale
2CBP booster pump.
COMPONENTS OF A BOOSTER
PUMP
Booster pumps are made up of:
o
Pump Body
o
Impeller and Shaft Assembly
o
Mechanical Seal
o
Gearbox
Figure 1-5 shows these basic parts of a Hale
booster pump. These parts are briefly
described in the following section.
Pump Body
The Hale single-stage booster pump body is a
single-piece casting. Service of the impeller,
clearance rings, and mechanical seal is
accomplished by removing the pump body from
the pump head and gearbox.
The pump body is constructed from fine grain
cast iron. For areas where salt water is
commonly used, a bronze version of the booster
pump is available.
Impeller and Shaft Assembly
The impeller provides velocity to the water. The
impeller is made of high quality bronze and is
mounted on a stainless steel shaft that is
rotated by the gearbox. Water enters the
rotating impeller at the intake (or eye). The
vanes guide water from the inlet to the
discharge. Vanes curve away from the direction
of rotation so water moves toward the outer
edge (see Figure 1-2). The shrouds form the
sides of the impeller and keep the water
Figure 1-4: 2-Stage waterflow
(Top half of 2CBP shown only.)
Figure 1-5: Parts of the Hale Booster Pump