2. Types of pumps
• There are three main types that will
be covered;
– Rotary gear
– Rotary vane
– Centrifucal
• Centrifucal pumps are the most
common type of pump found today,
we will go into its use in depth
3. Rotary Gear Pumps
• Rotary pumps
work by using tight
tolerance gears to
push water
• Tolerances are so
tight that this
pump will pump air
4. Rotary Vane Pumps
• These pumps work
like the rotary gear
pumps, but have
vanes that can
extend and retract
• This pump resists
the effects of wear
much better
5. Parts of the centrifical pump
Throttle controls
the rotation speed
of the impellor.
More throttle =
more pressure
15. Discharge Manifold
• The water being
discharged from
the pump is forced
into a manifold; the
junction for all
discharge lines
• The manifold has
all of the discharge
valves that are
controled from the
pump panel
16. Using the relief valve
Relief Valves are
Used to sharp
increases in
pressure from
going all the way
through the
attack lines and
harming the
nozzle crew
Excess
pressure is
dumped into
the intake
side of the
pump
19. Centrifucal Pump Problems
• There are several conditions that can
reduce the life or destroy the pump;
– Running the pump with nothing flowing
or circulating
– Cavitating the pump
– Running the pump dry
20. Pump Running, but not
Discharging
• Water that is held in
closed lines and in the
pump will be warmed by
the friction of the
running pump
• If let go long enough, the
water can boil and
cavitate the pump
• Check to see if your
hoselines are warm or
hot
21. Pump Cavitation
• This occurs when
there is too much air
in the pump, or there
is more water being
discharged than is
coming into the pump
• Sounds like gravel
rolling around on the
inside of the pump
casing
22. Running the Pump Without
Water
• Pumps need the
water for cooling,
lubrication, and to
swell the packing
• Without water in
the pump, the heat
from friction will
quickly destroy a
pump
