Operating From Draft
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Operating From Draft

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Pump Operation

Pump Operation

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Operating From Draft Presentation Transcript

  • 1. OPERATING FROM DRAFT Paulding County Fire DRAFTING OPERATIONS
  • 2. First Considerations
    • Selecting a site
    • Stability of the ground
    • Safety of the operator
    • Amount of water available
    • Type of water
    • Accessibility of water
    • Always know locations of water sources
  • 3. Clearance and Depth
    • 24 inches over and around strainer
    • Insures maximum capacity can be reached
    • Creation of whirlpool effect
    • Allows air into pump
  • 4. Water
    • Any kind of water can be used
    • Salt Water and Non-potable water can cause corrosion
    • Dirty Water – Can cause strainer clog
    • Worst type to be used: Dirty or Sandy
    • Causes the impeller to wear faster
    • Causes abrasive action to the internal components of the pump
    WATER
  • 5. Con’t
    • Reduction in the pump capacity
    • Bad water affects pump packing
    • Leaks in turn lead to problems with airtight pump
    • Which also affects pump capacity
    • Inability to pull vacuum
  • 6. Atmosheric Pressure
    • When operating from draft
    • Always maintain water in the booster tank
    • Drafting is accomplished by evacuating air from the pump and allowing atmospheric pressure to push water in
    • Atmospheric pressure = 14.7 psi
    • 14.7 psi has to overcome elevation pressure and friction loss in the suction hose.
    Atmospheric Pressure
  • 7. Cont
    • The higher the lift, the greater the elevation pressure, the less friction loss that can be overcome, the more the capacity of the pump is decreased
  • 8. Class A Pumpers
    • All Class A Pumpers are rated to pump their capacities at 10 feet of lift, if the lift is lower the capacity is increased, and vice versa
    • A pumper in good condition can lift water approximately 23 to 24 feet
    • For effective operation the maximum lift is about 20 feet and the amount of water that can be supplied is approximately 60%
    Class A Pumpers
  • 9. Connecting and Drafting
    • Do not place the unit in pump until you can be assured that all connections are made
    • Make sure that all the gaskets are in place
    • Make sure there is no sand or grit inside the couplings
    • If available, use a floating strainer
  • 10. Cont
    • Make sure that all connections are made airtight
    • If necessary, do this with a rubber mallet
    • It is usually easier to connect the fittings of the hose and drop the strainer into the water followed by pulling the unit into the desired location
    • A roof ladder can be used if the slope is steep
  • 11. Priming the Pump
    • Before priming, check the following
    • All drains and valves are closed
    • All unused openings are capped to make an airtight seal
    • Throttle the pump up to approximately 1000 rpms
    Priming the Pump
  • 12. Cont
    • After the pump has been made airtight, slowly activate the primer
    • Vacuum will read on the compound gauge
    • Vacuum should read approximately 1 inch of mercury for every 1 foot of lift
    • Vacuum is read from the surface of the water to the eye of the impeller
  • 13. Cont
    • As the primer operates, vacuum increases and water is forced into the hose
    • When the body of the pump fills with water a steady stream of water will be discharged onto the ground
    • Once the pump has been primed, the master gauge will register pressure
  • 14. Cont
    • The entire priming action should take approximately 10 to 15 seconds
    • Priming should never take more than 30 to 45 seconds
    • Most of the E-ones will prime fairly fast
    • The most common cause of failure is air leaks
    • If you cannot pull prime in 30 seconds, shut down and reevaluate all of the connections
  • 15. Cont
    • If all attempts at priming have failed and all intakes, discharges, openings, and valves have been checked; shut down the pump and attempt to contact maintenance. Explore the possibility of pump failure
  • 16. Problems That Occur
    • Air Leaks on the intake side of pump
    • Whirlpool allowing air to enter the pump
    • Air leakage due to defective pump packing
    • Air leaks on the intake side of the pump are the most common problems
  • 17. Cont
    • The first place to check is the suction hose and connections
    • If the water tank is empty, the tank to pump line may be the source of leakage
    • Again reevaluate all valves, openings etc.
  • 18. Intake Clogging
    • How do we know the strainer is clogged?
    • A sudden increase in vacuum pressure
    • Cure for the problem
    • Drop the engine rpms until the pressure drops, attempt to clear the blockage and restore the flow.
    • Collapse in the liner of hard suction
    Intake Clogging
  • 19. Cont
    • The only cure for an internal liner collapse on a hard suction hose is to shut down the operation and replace the hard suction hose
  • 20. Shutting Down Operations
    • When Shutting down operations, slowly throttle down rpms or engine speed to an idle
    • Take the pump out of gear and allow the pump to drain
    • Always operate the primer for a few seconds afterward to allow lubrication of the primer
  • 21. Questions Questions ?