1. #26
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    There are some days, or nights, that Mr. Murphy climbs on your shoulder and whisper's in your ear "I'm here". And it's all downhill from there. Happened to me a few months ago on fire in a dormitory, everything the could go wrong did.

  2. #27
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    Doing some thinking the other day I can see some serious dangers associated with -EDIT-PSI mode in the event of a burst line or a pressure relief (on a receiving engine pump panel intake or an aerial relief valve) valve popping causing the governor to speed the engine up and trying to maintain the pressure.

    I can see the point about having the source engines in RPM, I also see this is probably a necessity in relay in order to prevent all the pumps from fighting each other. In a relay, I am thinking the only rig that need be in PSI mode would be the attack end engine?

    Anyone have any thoughts on these thoughts of mine?
    Last edited by MG3610; 07-28-2009 at 04:54 PM.

  3. #28
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    Quote Originally Posted by MG3610 View Post
    Doing some thinking the other day I can see some serious dangers associated with RPM mode in the event of a burst line or a pressure relief (on a receiving engine pump panel intake or an aerial relief valve) valve popping causing the governor to speed the engine up and trying to maintain the pressure.

    I can see the point about having the source engines in RPM, I also see this is probably a necessity in relay in order to prevent all the pumps from fighting each other. In a relay, I am thinking the only rig that need be in PSI mode would be the attack end engine?

    Anyone have any thoughts on these thoughts of mine?
    MG3610,

    Class 1 tells you in there instruction video that only the first engine in the relay should be in PSI mode, all others should be in RPM.

    Chief1ff

    Mark

  4. #29
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    Default Governor RPM Mode

    "And in PSI mode you can get wide fluctuations in pressure if you have a incoming feed line particularly from another pumper or nurse tanker.Better to use rpm in those instances. T.C."

    The above issue was one we struggled with and with some help from Class 1 we figured it out. Tankers are used extensively in my FD, and are equipped with governors as well as the engines. We instruct our engineers to utilize RPM mode unless thay are the attack engine - actually pumping handlines, ladderpipe, fdc, etc. The attack engine must provide pressure control (PSI mode) but this is not required of supply apparatus. In fact, a governor eqipped tanker supplying a governor equipped engine both in PSI will induce oscillations in the pressure of both engines. It's like to governors are constantly adjusting to compensate for the other one doing the same thing. It's weird, but we stopped it with the procedure I described above.

    We also instruct engineers to use RPM mode when:

    Drafting (until a draft is established then change to PSI mode)
    Charging LDH hose (when charged change to PSI if you are the attack engine)
    Supplying another engine in relay
    When pumping with low residual pressure (less than 10, and I know what NFPA says about this)

    I would like to add that we have been thrilled with the FRC Pump Boss. The Class 1 Captain has been quite challenging, but once our folks get to know the quirks they do fine with them.

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