This is our second video in a series for pump operators. We will discuss how to calculate flow from a given nozzle and what the common nozzle pressures we use as they relate to each nozzle type.
I was just promoted to pumper engineer and after seeing your videos gave me the confidence in performing my duties and getting a better understand of the different components and responsibilty of the engineer. Thank you so much and STAY SAFE!
QUESTION: At the part of the video where you are calculating GPM for the combination fog nozzle, which i s expected to run @ 100 PSI,, then if you are running at the lower end of the GPM adjustment dial, let's say, 70 GPM then if you are still running the noxzzle @ 100 PSI from the pump, does this degrade the flow/stream coming out of the nozzle such as turbulance and sputtering output of the stream? As an example. On our Engine 2-0 (rescue pumper) Crosslay #1 has a combination nozzle labeled as 70~250 GPM @ 100 PSI. If we supply the watter @ 100 PSI but have the GPM dialed down to 70 GPM, is the quality of the stream floiwng out of the nozzle over pressured or does tthe Nozzle make mechanical adjustments to the 100 PSI to provide a properly flowing stream @ 70 GPM in that scenario?
Your governor setting does that… if you set the pump at 100psi… then go from let’s say 250gpm down to 70 your engine should automatically idle down and compensate for that then pick back up once it senses that it can
Excellent. I realize that the maths section where you work the formulas may not translate directly, but having popup texts at the parts of this video series where you conversationally throw numbers into the mix, then it would be beneficial.
I'm not exactly sure how the constant is reverse engineered but basically if you flow test hose and find the outlet pressure with a gauge and the nozzle pressure with a gauge you can find the friction loss through actual testing. You could then solve the equation with the given test results to "reverse engineer" things like the coefficient for the hose or the constant.
Hallo sir i'm Zhuu from indonesia, i have a question for you, when i see your formula i'm little bit confuse about d2. is that nozzle diameter or hose diameter or coupling diameter? please help me to understaind and thank you so much for your video, i'm really like it
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29 is the given constant. That variable will never change. It's actually 29.7 but some will round in an attempt to limit infinite numbers past the variable bc it's irrelevant with flow calcs.
