Hale MBP Booster - Manual (Page 19)

❑ Introduction
18 Silencer Series Booster Pump, p/n: 029-0020-83-0
Pump Body
(See Figure 2-4: “Over-
view of Hale Booster
Pump and Gearbox.”)
As water discharges
from the impeller, it
enters the volute (pump
body). The volute is
shaped so that its area
increases from the cut-
water to its full capacity
at the volute throat. This
gradual increase in size
maintains a constant
average velocity through
the volute.
Standard APS and MBP
volutes are constructed
from fine-grain cast iron. For areas where salt water is commonly used, a
bronze version of the Model APS is available.
The volute is a single piece, and must be removed to service the impeller,
clearance rings, and mechanical seal. Removal of the volute can often be
accomplished without removing the pump and gearbox assembly from the
apparatus.
Mechanical Seal
The mechanical seal is
common to Hale booster
pumps. (See Figure 2-5:
“Mechanical Seal Over-
view.”)
The stationary seat is in
constant contact with a
rotating seal ring to pre-
vent leakage. The seal-
ing diaphragm is made of
a rubber elastomer spe-
cifically designed for high-
temperature operations.
Figure 2-4: Overview of Hale Booster Pump and
Gearbox
Figure 2-5: Mechanical Seal Overview