1. Pump types and theory

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

6. How the centrifical pump works

7. How the centrifical pump works

8. How a centrifical pump works

9. Water supply for the pump
Booster tank
Intake from steamers and 2 ½

10. Tank to pump

11. Tank fill
Water being supplied to steamer intake into pump, flowing discharges and filling tank at the same time

12. Two stage pumps

13. two stage pump in volume

14. Two stage pump in 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

17. Using the relief valve

18. Using the relief valve

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

23. Conclusion