Jadnashua
Retired Defense Industry Engineer xxx
Air is a progressive spring, not linear. So, if you start at a lower pressure, the volume change is greater than if you start at a higher pressure.
Bob NH said:For the case where the tank is properly precharged for the "start" setting, a 30/50 setting has more available drawdown than a 40/60 setting because the air is compressed to a smaller volume in going from 30 psi to 50 psi than is the case when compressing from 40 psi to 60 psi.
Because the final "stop" volume of air is less, there is more water in the tank that can be "drawn down" before the pressure reaches 30 psi again and starts the pump.
Gary Slusser said:The higher the pressure the pump is run at, the less drawdown gallons in the pressure tanks. That's because with higher pressure, the velocity of the water is increased.
Hmmm something else for me to test, evaluate water usage with a 20/40 setting vs a 40/60 setting.... nah, I think not.Gary Slusser said:Do you agree that higher velocity causes more water use than the same house would use with lower pressure settings?
Not sure what you mean not so in the real world? The reason the max lift of water (sucking it up) is limited to 33.9 feet is because of the atmospheric pressure, at sea level that would be 14.7 PSIA, we know that for every foot of elevation we raise the water tank we get .433 psi/foot more. 14.7/.433 = 33.9 feet.speedbump said:Since Rancher was the only one to comment on my Tailpipe thread, maybe some of the engineers can explain why this is so in technical speak, but not so in the real world.
https://terrylove.com/forums/showthread.php?t=13381
You can't get 33.9 because that's true only in an absolute vacuum, at sea level, and you have other losses.
Gary Slusser said:Ok, so now I've jumped through your hoops while you've repeated your correction of my incomplete comment and we can talk about velocity. I'm sure you agree that higher pressure causes higher velocity? Do you agree that higher velocity causes more water use than the same house would use with lower pressure settings?
Wow, a gold star, another 99 of those and I'm qualified to be Sammy's apprentice.
You're assuming the person is not smart enough to turn it on and off faster, OK, you're right a higher pressure will use more water...Gary Slusser said:And all other water use such as showers, brushing teeth and all other water use where the water volume is not 'measured' as in your examples, will increase the volume of water used.
This is awkward, but...
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