In response to a post by BobH...
A data point...
My compressor pumps my 80 gallon tank, plus the compressed air hoses (150 ft plus dryer), from 0 PSI to 125 PSI, in exactly four minutes.
Compressor pump-up time (BobH)
Mar 10, 2009
17 Replies
Thanks, BobH
How do you pull that initial vacuum?
And why?
Gunner
"Human nature is bad. Good is a human product A warped piece of wood must be steamed and forced before it is made straight; a metal blade must be put to the whetstone before it becomes sharp. Since the nature of people is bad, to become corrected they must be taught by teachers and to be orderly they must acquire ritual and moral principles." ?Sun Tzu
I suspect he means PSIG. Some gages bother to mention it, some don't... --Glenn Lyford
But doesnt he start off with 14.6 +/- PSIG before he turns it on?
Gunner
"Human nature is bad. Good is a human product A warped piece of wood must be steamed and forced before it is made straight; a metal blade must be put to the whetstone before it becomes sharp. Since the nature of people is bad, to become corrected they must be taught by teachers and to be orderly they must acquire ritual and moral principles." ?Sun Tzu
OK, given the , we'll assume a certain amount of chain yanking. He should have 14.7 PSIA or so.
Pete Keillor
What does your pressure gauge show when your compressor tank is open,
0 or 14.7? i
PSIG.
How much pressure does an open tank hold, if you say atmospheric pressure is zero?
Quincy QR-25 Model 390, 15hp motor, tank opened until guage read 0.
200 gallon tank. Exit valve closed, so this is only the tank. 20psi = 26s 40psi = 60s 60psi = 1:34 80psi = 2:10 100psi = 2:47 120psi = 3:24 125psi = 3:34
No, he starts at 0 PSIG, which is around 14.6 PSIA. His 125 PSIG also equates to about 139.6 PSIA.
Gunner, stop teasing these guys!
Bob
Todd Rich wrote: (snip)
What? I didn't even get a "You suck!" out of this?
you suck. I am very envious. Not that I could use that kind of CFM.
i
Zero, of course; pressure is measured as a differential, just like voltage.
Now, if you take that empty tank at zero pressure, cap it up, and fling it into space, *then* it will be at 14.7 PSI.
Jon
Then you can start the compressor in "space" and see how quickly it will pump up the tank.
No, it still holds 1 atm. Saying it is zero doesn't make it so.
What's that in hectopascals?
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