Thanks Inch, I think I have the hydraulics nailed pretty well. With a base demand of 200gpm and a 75psi to 70psi bleed down time of 2 minutes, an air volume of 5600 gallons is required. That is about what we have now with a 10000 gallon tank.
A bladder of several hundred cubic feet for that...
bimr: "Is this a new problem, a new system, or a problem that has occurred for a long time."
Thanks, should have said. This prob has been there for several years.
Short history: The tank date is 1999. There hadn't been much talent around or motivation to get things right. Recent newspaper...
Operatorjoe addl: Re: your suggestion that about the pumps as a source of air, the water is clear at a tee connection between the pump and the tank. I will double chk it though. ron
The pressure varies between about 70psi to 75psi as the pumps cycles on/off every few minutes. The sight gauge shows about half full. A pump run raises the level an inch or two from the turn on point.
Opjoe: If air was being pulled in by the pumps, the sight gauge would show falling water level...
Thank you for the response Littleinch. ("Littleinch", an epic pipeline I heard of as a kid. What a country we were![smile] ) -
Our system flows about 100 gpm to 2000 gpm and the boosters are on/off 25 to 75 hp pumps. So, the railroad car sized air-over-water tank/accumulator seems necessary...
Our small muni water system uses a ~10,000 gal hydro-pneumatic tank in combination with booster pumps to deliver water to our customers. A suitable elevated tank is not feasible. The system works OK, but air infuses into the flow in the tank causing a very objectionable temporary cloudiness at...
Re: the tank engines.
They were quite common, called "tank engines" and available surplus for many years after the war. They were Continental W-670's, 7 cylinder, rated 225 hp. Used often by crop dusters. (why overhaul? just get another tank engine)
On gasoline fueled armor:
Pilot sometimes...
R-680 Lycoming, I believe.
680 cu.in. 300 hp @ ~2100 rpm
They where one engine option for a Stinson Reliant.
I flew one so equiped in the 60's, an oldy-but-goody even then. Very smooth.
But in a motorcycle? I only believes it cuz I sees it.
Thx mohpower for the post. If I read that post just one more time, I think I'll have it down for good. That "ferro-resonance" has been a bit of a mystery 'til now.
I might add that I had used these regulators many years ago. There is one MAJOR shortcoming of these units that anyone...
Waross:"Remember that capacitor current increases as the square of the voltage..." Typo?
I think you meant VoltAmpsReactive increases by the square of the voltage.
Good comments on this prob though. And, yes, nice meter. $$?
I may be bugging you power side guys soon. Re: VSD's and soft starts...
Since side branching of a fuel hydrocarbon has a big effect on octane number, I am not sure one can be very predictive of fuel performance by using merely the carbon/hydrogen ratios.
For example, normal octane (C8H18) has very poor performance, but Tri Methyl Pentane, also (C8H18), and also...
sciguyjim -
I messed with radiating surfaces and coatings years ago.
What I remembered was that ALL paints are nearly black in the far infrared. Here is a link to a commercial site, the same outfit with those nasty pop-up ads, BTW. But the table is fairly complete...
lewish -
An Opamp can not swing its output to the rails. Thus if you use +/-5V as your supplies you can swing the output from -3.8 to +3.8 volts.
A pleasant surprise for those of us who had not done much opamp shopping recently. There are now a variety of rail to rail opamps at little...
re: telco
Sorry, just meant the telephone company - jargon.
If the modem path is through the wireless link, then through the telephone system to a remotely located modem, both systems will add noise, distortion and bandwidth limitation of their own. The sum of these will determine what the...
Here is a link on telephone interfacing. From what I have looked at, there is a lot there at the right level to help you.
http://www.hut.fi/Misc/Electronics/circuits/teleinterface.html
Just below the middle of that long page, are some op amp interface circuits that might be of interest.
Your...
