This is the fourth video in our Pump Operator Training Series reviewing how to calculate Elevation Gains and Losses and also how to account for Appliance Loss.
Michael Poulin The automatic nozzle will maintain the same nozzle pressure as the flow changes. So, on the nozzle you will see the pressure the nozzle operates at, or a range of pressures and flows the nozzle operates at. The only way to truly know what your pressure loss is would be to flow test it. That being said you should follow the same general rules of thumb and elevation pressure losses when using an automatic nozzle. The only thing different with the automatic nozzle is that as the flow increases or decreases the nozzle pressure stays relatively the same. If it is a 100 psi automatic then I would add 25 for the loss in the piping and then add any pressure loss due to elevation of the aerial (Height/2).
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I seeing your videos and its great to refresh several things.....keep doing well I got a question...this scenario...i got a 100' ladder truck full rise and transmission or pto fail....but still need for attack and i got one pump 1.500 still work along with ladder for water supply because the truck was the first on scene can I use the pump for making pressure to keep that ladder in operation without pto???? Could this formula be apply for that? Thanks for any answer you can bring and once again keep knowledge roll for support our brothers in call!
Most likely of you loose the PTO you will loose everything including hydraulics, you pump, power, etc. the only way to continue flowing water would be to have an engine pump into you. Basically use the waterway pump pump from a different source. However, if you loose the PTO it should be a pretty serious emergency and you would need to use hydraulic overrides in order to get your ladder down. If no one was on the ladder than I might could see some situations where you would leave the ladder elevated to just flow water from above. Most likely you wouldn't be able to control the nozzle though. Thanks for the kind words.
