Pumping Flashcards
Parts of pump
Discharge
Impeller
Volute
Guide vanes
Eye
Pump capacity rating
LDMH 1500 -5700 L/min
LDMH 1000 - 3800 L/min
@1000kpa
What does the tank to pump valve do
Allows you to use onboard water while in the open position.
Hydrant use in the closed
Can be operated at anytime
What does the drain valves do?
Allow you to drain pressure from charged deliveries
What does the pump drain valve do?
Completely drains pump casing
High pressure hose is..
25/19mm 90m long
What gauges are on pump panel?
Compound gauge
Main pump gauge
HP gauge
Flow meters
How do you know the pressure relief valve is activated?
Green light on
Drop in RPM
Slight noise
Signs of cavitation?
Compound gauge low or in vacuum
Collector lines going soft
Discharge pressure reducing
Temp fix of cavitation?
Reduce revs
Gate back
Shut off deliveries
Open tank to pump
Permanent fix of cavitation?
More water in.
Additional collectors
Additional standpipe
Causes of cavitation?
Lift too high for volume/pressure being discharged
Draughting hose diameter too small for volume being discharged
Restriction of draughting hose
Water temp too high
Hydrant supply being overrun
Indicators of cavitation?
Revs go up due to less resistance
Sound like pebbles going through pump
Compound gauge
Reduced flow
High pressure ratio and max pressure?
2:1 of main pump
4200kpa max
Supplementary cooling
Open unused HP line to ground
Open unused HP to tank inspection
Open branches regularly
Connect a delivery to tank filler
Disengage HP when not in use
Throttle back when high pressures aren’t required
Monitor..
Must have two collectors connected
Will over run supply very easily
Should be turned off/on when pump at idle
Pneumatic valves won’t work under pressure
What is cavitation?
In a vacuum water will boil at a much lower temperature, therefore when the pressure on the suction side of the pump falls below the vapour pressure of water, there will be local boiling and a cloud of vapour bubbles will form. These are carried to the region of the inlet of the pump, where the cavities suddenly collapse causing damage to the impeller
Emergency shut down reset:
Reset emergency stop button
Return throttle to idle
Select neutral
Disengage both pumps
Turn ignition off and wait 10 seconds
Restart engine
Engage pumps
Select D on transmission
Recommence pumping
What is the pressure relief valve?
The pressure relief valve provides a means of maximum delivery pressure from the main pump.
Has no effect on HP pump/hose
Only used when tank to pump is closed
Delivers 200kpa relief
Air in pump?
Will not cause cavitation but produce similar signs.
Main difference is crackling a branch
Will cause the pump to run away
What type of primer does ACTFR use?
Rotary sliding vane
Factors effecting lift
Creating flow
Change of direction as water enters strainer
Friction in strainer/hose
Restriction in hose
Altitude
Atmospheric pressure
Entry loss(turbulence & change of direction at impeller
Mechanical condition of pump
3 types of relay
Open circuit relay
Closed circuit relay
Tanker relay
What kind of seal does the pump use?
Ceramic mechanical seal
Pump cooling volumes
Varley 60L/min
Series 4 18L/m
