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Pump theory


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Pump theory

  1. 1. Pump types and theory
  2. 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. 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. 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. 5. Parts of the centrifical pump Throttle controls the rotation speed of the impellor. More throttle = more pressure
  6. 6. How the centrifical pump works
  7. 7. How the centrifical pump works
  8. 8. How a centrifical pump works
  9. 9. Water supply for the pump Booster tank Intake from steamers and 2 ½
  10. 10. Tank to pump
  11. 11. Tank fill Water being supplied to steamer intake into pump, flowing discharges and filling tank at the same time
  12. 12. Two stage pumps
  13. 13. two stage pump in volume
  14. 14. Two stage pump in pressure
  15. 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. 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. 17. Using the relief valve
  18. 18. Using the relief valve
  19. 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. 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. 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. 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. 23. Conclusion