Pump types and theory
Types of pumpsThere are three main types that will be covered;Rotary gearRotary vaneCentrifucalCentrifucal pumps are the most common type of pump found today, we will go into its use in depth
Rotary Gear PumpsRotary pumps work by using tight tolerance gears to push waterTolerances are so tight that this pump will pump air
Rotary Vane PumpsThese pumps work like the rotary gear pumps, but have vanes that can extend and retract This pump resists the effects of wear much better
Parts of the centrifical pumpThrottle controls the rotation speed of the impellor. More throttle = more pressure
How the centrifical pump works
How the centrifical pump works
How a centrifical pump works
Water supply for the pumpBooster tankIntake from steamers and 2
Tank to pump
Tank fillWater being supplied to steamer intake into pump, flowing discharges and filling tank at the same time
Two stage pumps
two stage pump in volume
Two stage pump in pressure
Discharge ManifoldThe water being discharged from the pump is forced into a manifold; the junction for all discharge linesThe manifold has all of the discharge valves that are controled from the pump panel
Using the relief valveRelief Valves areUsed to sharp increases in pressure from going all the way through the attack lines and harming the nozzle crewExcess pressure is dumped into the intake side of the pump
Using the relief valve
Using the relief valve
Centrifucal Pump ProblemsThere are several conditions that can reduce the life or destroy the pump;Running the pump with nothing flowing or circulatingCavitating the pumpRunning the pump dry
Pump Running, but not DischargingWater that is held in closed lines and in the pump will be warmed by the friction of the running pumpIf let go long enough, the water can boil and cavitate the pumpCheck to see if your hoselines are warm or hot
Pump CavitationThis occurs when there is too much air in the pump, or there is more water being discharged than is coming into the pumpSounds like gravel rolling around on the inside of the pump casing
Running the Pump Without WaterPumps need the water for cooling, lubrication, and to swell the packingWithout water in the pump, the heat from friction will quickly destroy a pump
Conclusion
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