Hale 2CBP - Manual (Page 5)

Introduction Sec I-1
Booster Pumps
SECTION I:
INTRODUCTION
OVERVIEW
Hale Products currently has 3 models of booster
pumps in production:
o
AP
o
CBP
o
2CBP
Unless otherwise indicated, these procedures
will apply to all models of Hale booster pumps:
Any variations in operations and maintenance of
the different models will be addressed within the
context of this manual.
Hale booster pumps are the favorite of fire
fighters throughout the world. Booster pumps
can be used as initial attack pumps or as
auxiliary pumps in conjunction with the
apparatus main pump. Covering a range of
capacities from 20 Gallons Per Minute (GPM)
(76 Liters per Minute, LPM) to 500 GPM (1,893
LPM), Hale booster pumps offer the versatility,
dependability, reliability, and ease of operation
so necessary to effective fire fighting.
Hale Booster Pumps are of a compact size and
lightweight design for easy mounting on the
apparatus chassis. The pump is coupled to the
gearbox and the apparatus builder need only
supply the transmission PTO (power takeoff)
and connecting shaft.
Principles Of Operation
This section reviews the principles of operation
of Hale booster pumps and provides a
description of the pump components.
Centrifugal Force
Hale booster pumps are centrifugal pumps that
operate on the principle that centrifugal force is
created by a rapidly spinning disk. Figure 1-1
shows an amount of water has been placed at
the center of a disk. The disk is rotated and
the water is thrown outward from the center to
the edge of the disk. The velocity at which the
water travels from the center directly relates to
the diameter of the disk and the speed of
rotation. When water is confined in a closed
container (such as the pump body), the velocity
is converted to pressure; pressure is therefore,
dependant on the speed of rotation.
There are three inter-related factors that
regulate the performance of a centrifugal pump:
o
Speed (RPM): If the speed of rotation
increases with the flow held constant, the water
pressure increases.
o
Pressure: Pressure is usually measured
in pounds per square inch (PSI) or (BAR). If
pressure changes and speed is constant, the
flow will change inversely. That is, if pressure
increases, flow decreases.
o
Flow: Flow is usually measured in the
number of gallons of water per minute (GPM)
or liters per minute (LPM) that a pump can
deliver when supplied from draft. If the
pressure is held constant, the flow will increase
with an increase in the speed of rotation.
Figure 1-1: Centrifugal force
from a rotating disk