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Husky 60

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Transcript

  • 1. Foam Team Training Series “ Husky 60 Foam System”
  • 2. Introduction
    • The Husky 60 Foam Proportioning system is a demand system using a balanced pressure principal.
    • This means that the foam concentrate pressure is automatically regulated to be equal to the water pressure by controlling the foam proportional output.
    • Each output that is foam capable has its own proportioner.
  • 3. Introduction
    • The foam concentrate is pulled from the foam tank by the foam pump and discharged to the metering valve that has been activated.
    • The automatic system is maintained by the output of the hydrostatic pump which is run directly off of the water pump.
  • 4. Important Numbers
    • The MAX pressure for this system is 250 psi.
    • Being a Husky 60 means that this Foam concentrate pump will have a max output of 60 gallons per min. (Foam concentrate)
  • 5. 3% Operation
    • At 3% operation:
      • We can flow 2000* total gpm:
        • 1940 gpm of water
        • 60 gpm of foam concentrate
    • *E-1 is only rated at 1750, however you might get close to 2000 based on previous pump tests with a good water supply.
  • 6. 6% Operation
    • At 6% Operation:
      • 1000 gpm
        • 940 gpm water
        • 60 gpm foam concentrate
  • 7. Compatibility
    • The Husky Foam system is compatible with all known Class B and Class A foam concentrates but it should not be mixed without thoroughly cleaning out the system.
  • 8. Manual Override Selector Valve
    • This valve should normally be set to auto
    • This two function valve determines the operating mode of the proportioning system.
      • Automatic – System will automatically balance foam concentrate pressure to water pressure
      • Manual – System will respond to operator adjustment of the manual control valve
  • 9. Manual Override Control Valve
    • Normally backed out to zero (Fully counter-clockwise)
    • This is only operational when the selector valve is in manual mode.
    • Manual operation of this valve determines the pressure of the foam concentrate pump.
  • 10. Foam Concentrate Tank
    • The foam tank is designed to store all types of foam concentrate.
    • Design features typically include:
      • 1” drain valve
      • Expansion dome with a locking fill hatch and pressure vacuum vent
        • The dome allows for changes in atmospheric pressure and temperature
  • 11. Foam Concentrate Tank
    • Foam tank levels must be maintained at the half-full mark in the expansion dome at all times to reduce the air to foam interaction
    • The pressure vacuum vent helps to regulate the atmospheric pressures during normal, suction and filling operations.
  • 12. Foam Concentrate Tank Shut-Off
    • This valve should always be off unless calling for foam concentrate
  • 13. Foam Concentrate Pump
    • The foam concentrate pump is a positive displacement rotary gear self-priming pump driven by the water pump.
    • The foam concentrate pump is operational only when the water pump is engaged.
    • The pump can be stored “dry” or “wet”
  • 14. Duplex Pressure Gauge
    • Located on the pump panel, the gauge indicates the foam concentrate pressure (red needle) and the water pressure (black needle) simultaneously.
    • When both needles indicate the same pressure then the system is balanced and functioning normally.
  • 15. External Foam Pick-up Connection
    • A quarter turn ball valve is located on the pump panel to pick-up additional foam concentrate as needed.
  • 16. Normal Standby Mode
    • Manual override selector – automatic
    • On/Off selector – Off
    • Tank B Control Valve – Closed
    • Metering/Shutoff Valves – Closed
    • Manual Override Control valve – Zero (Fully counter-clockwise)
  • 17. Normal Foam Operation
    • Manual override selector – automatic
    • On/Off selector – On
    • Tank B Control Valve – Open
    • Metering/Shutoff Valves – Desired %
    • Manual Override Control valve - Zero
  • 18. Foam Tank Filling Instructions
    • Park the vehicle on a level surface
    • When filling manually into the expansion dome hatch, use a fill tube that can reach down to the bottom of the tank to prevent any aeration.
    • Pour the concentrate down the center of the round fill tube, this tube allows the concentrate to fill beneath the surface of the foam to reduce aeration.
  • 19. Filling using the foam pump
    • Connect the external foam pickup tube to the external foam supply
    • Open the ball valve
    • Place the Manual override selector valve in the manual position
    • Ensure that the pressure regulating valve is fully backed out
    • Engage the water pump
  • 20. Filling using the foam pump
    • Adjust the foam pump speed using the pressure regulator valve
    • Slowly partially open the foam tank fill valve
    • Have a spotter on top watching the fill dome as it fills. DO NOT fill too fast, and when concentrate starts to enter the dome stop the fill procedure.
  • 21. Filling using the foam pump
    • When the tank is full, turn the pressure regulation valve fully out (counter-clockwise)
    • Place the manual override selector valve back into the automatic position.
    • Disengage the water pump.
  • 22. Starting a Foam Operation
    • Connect to a water supply
    • Place the desired foam tank selector switch in the open position
    • Turn the foam system on
    • Open the metering shutoff valve where foam is desired, turning the selector past the desired setting and then back.
    • Increase engine speed to desired pressure.
  • 23. Stopping Foam Operations
    • Close the metering valves
    • Decrease engine speed/pressure
    • Turn the system off
    • Allow the lines to continue to flow until they run clear.
    • Close the foam concentrate supply valves to the foam pump
    • Open the minor flush and discharge flush valves to flush out the downstream side of the metering valves
  • 24. Stopping Foam Operations
    • Refill the foam concentrate storage tank to the one-half full level in the expansion dome.
    • Return all valves and switches to their normal stand-by positions
  • 25. Manual Mode
    • Should the auto-balancing system fail take the following steps:
      • Turn the Husky manual override selector valve to the manual position
      • Set the pump discharge to the desired pressure
      • Open the desired metering valve to the required percentage
  • 26. Manual Mode
      • Increase the foam concentrate pressure by rotating the manual override control knob clock-wise until the red and black needle align
      • As additional lines are opened, the manual override may have to be adjusted to maintain the proper balance
  • 27. Foam Operation from an external source
    • Locate the supply near the pump panel ensuring that you have sufficient quantity to not run the pump dry
    • Connect the pick up tube and insert into the foam supply
    • Open the external concentrate valve
    • Turn the foam tank selector off
    • Ensure the foam tank fill valve is closed
  • 28. Foam Operation from an external source
    • If foam was not flowing using the onboard tank reverse 3 and 4
    • If cavitation of the foam pump occurs, open the foam pump drain valve to evacuate the air, allow the pump to prime then close the valve.
  • 29. Periodic Operation
    • The foam pump should be operated on a routine basis to ensure the system is ready to go
    • The two acceptable methods of operating the foam pump is:
      • Actual foam operation utilizing normal flow procedures
      • Operating in manual mode with all metering valves closed
  • 30. Periodic Operation
    • Manual mode testing
      • Place the pump in gear
      • Switch the manual override selector valve into manual mode
      • Verify that the foam concentrate tank supply valve for the primary agent is open
      • With all metering valves closed make sure the Husky is OFF
      • Slowly increase the foam pressure to about 50 psi as shown on the red needle using the manual override control valve
  • 31. Periodic Operation
      • Allow the system to run for no longer than 40 seconds
      • De activate the Husky system, shutdown the water pump and truck returning the manual override selector to their normal standby position