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  1. #21
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    Quote Originally Posted by chiefengineer11 View Post
    What pump/apparatus is it on?
    It's on an 1981 Thibault Aerial. It's a 1050gpm hale pump.


  2. #22
    Forum Member FIREMECH1's Avatar
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    Quote Originally Posted by KuhShise
    Going from series (pressure) to parallel (volume), as FIREMECH states, will lower the discharge pressure (by about 1/2) and might place the attack line in danger if they are using automatic nozzles since it is possible to drop below the 100 psi minimum on the line.
    Anybody care to educate me on automatic nozzles and the 100psi min ???

    FM1
    I'm the one Fire and Rescue calls, when they need to be Rescued.

    Quote Originally Posted by EastKyFF
    "Firemens gets antsies. Theys wants to goes to fires. Sometimeses they haves to waits."

  3. #23
    Forum Member FWDbuff's Avatar
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    Quote Originally Posted by FIREMECH1 View Post
    Anybody care to educate me on automatic nozzles and the 100psi min ???

    FM1
    Thats the required minimum pressure (at the nozzle) for most automatic nozzles to function properly.
    "Loyalty Above all Else. Except Honor."

  4. #24
    Forum Member FIREMECH1's Avatar
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    What do you mean by "operate properly"?? The only nozzles I deal with are the deck gun and waterway nozzles. I have no clue what the hand nozzles do, or how they operate (except your basic open/close stream/fog manual type).

    FM1
    I'm the one Fire and Rescue calls, when they need to be Rescued.

    Quote Originally Posted by EastKyFF
    "Firemens gets antsies. Theys wants to goes to fires. Sometimeses they haves to waits."

  5. #25
    Forum Member Johngagemn's Avatar
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    An automatic nozzle is designed to always maintain 100 psi nozzle pressure. As you increase or decrease the pressure at the nozzle it will increase or decrease the flow rate through the nozzle in order to maintain the 100 psi. If you drop below 100 psi due to inadequate pump pressure the nozzle performs poorly and you have a very low flow rate.
    Just a guy...

    Lieutenant - Woodbury, MN FD (Retired)
    Road Captain - Red Knights MC, MN4

    Disclaimer: The facts and opinions expressed above are mine, and mine alone, and are not intended to represent the views of any company I have ever worked for, past or present.

  6. #26
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    Cool Other Resources.....

    A few resources you can also use for this type of information are: The "Good Ole Boys" (trust me, they know their stuff......), the Manufacturer's Manual, the Pump Panel/the area of the Pump Panel (look for Instructions/Directions on changing from Pressure to Volume) and also IFSTA Pumper, believe it's the 2nd Edition that's current.

    Ask your Engineer/Chauffeur or whatever your Department calls them. Also don't be afraid to ask Senior FFs that you trust.

    That's just my 2 cents to help ya.....
    "Be LOUD, Be PROUD..... It just might save your can someday when goin' through an intersection!!!!!"

    Life on the Truck (Quint) is good.....

    Eat til you're sleepy..... Sleep til you're hungry..... And repeat.....

  7. #27
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    Quote Originally Posted by drakescrossing View Post
    When i learned to pump we pulled out the parade piece--a 54 lafrance. Evertyhing was manual on that baby. Then we got to work with governors later.
    Same here other than she was a 69 lafrance. We got our first governors controlled engine a couple years ago and I hate the damn thing. I'll take a hand throttle and PRV any day.

  8. #28
    Forum Member FIREMECH1's Avatar
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    Quote Originally Posted by Johngagemn
    An automatic nozzle is designed to always maintain 100 psi nozzle pressure. As you increase or decrease the pressure at the nozzle it will increase or decrease the flow rate through the nozzle in order to maintain the 100 psi. If you drop below 100 psi due to inadequate pump pressure the nozzle performs poorly and you have a very low flow rate.
    Thanks for the info, and welcome aboard.

    FM1
    I'm the one Fire and Rescue calls, when they need to be Rescued.

    Quote Originally Posted by EastKyFF
    "Firemens gets antsies. Theys wants to goes to fires. Sometimeses they haves to waits."

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