80 gallon tank fill time?

[Badasssapper67]

Hey all,
I have upgraded my compressor, by upgrade I mean bigger capacity, if I can get it to work right haha.
I used to have a big box store type single stage two piston 60 gal set up. It was more quiet than my cheapo Costco oiless but it couldn't keep up while working on my caterpillar or other large farm equipment.
Now I have a two stage Dayton pump with an ebay single phase 5 hp Baldor motor (1750 rpm) and 80 gallon tank.
My question is, guys with an 80 gallon tank, how long does it take to fill it with 120lbs pressure? Mine is taking 12 minutes or more.
If there's interest I'll take some pictures, but Im not tech savy and I have to get help to do that so I don't want to ask if nobody is intereste

 

[rockwithjason]

my husky takes a while but i dont know exactly how long. i will time it when i go out later

one of the big issues is the pulley diameters. if it's taking too long you may have too low of a drive ratio to the pump. the pump should have an rpm rating on it's name plate. you can figure the actual rpms by taking the motor rpms and applying the drive ratio from the existing pulleys. also check for loose belts and mounting bolts.

 

[shoot summ]

My 60 gallon is pretty quick, will measure it in a bit, but 0-150 is under 5 minutes if I remember correctly.

Many factors involved here, the pump's capability, the speed you are running it, etc, 12 minutes seems kind of long to me.

ETA, drained the tank today, 0psi, fired up the compressor, took 6 minutes, 6 seconds to get to 155PSI.

My pump is rated higher, I'm turning it a little slower than it's rated as I was having heat issues with the motor when I was running it at the rated speed.

 

[PSYKO_Inc]

As for pulley diameters, the RPM rating on the pump is a maximum. You want to check how many amps the motor is pulling with a clamp meter and make sure you don't exceed the motor's amp rating. The faster the pump spins, the more air it moves, but it takes more amps to make that happen. I'd guess your pump is designed for a 3450 RPM motor, so your 1750 RPM motor is only turning it at half the speed it should be. A bigger pulley on the motor with solve it, but check the amps first and foremost.

 

[pcmeiners]

It all depends primarily on the true CFM output of the compressor; most manufacturers measure CFM differently, not adhering to the rules . Ambient air temperature, and humidity also play a part. Most high end 2 stage compressors are setup to fill an 80 gallon in approx 5-7 minutes.

 

[stonesfan68]

This will get you close:

cfm (ft3/min) = Gallons * (final pressure - initial pressure)
________________________________________________
______________7.48 * Patm * pump up time (minutes)

or

cfm = 80 x (120- 0) / (7.48 * 14.7 * 12) = 7.3 cfm

 

[larry_g]

One big thing missing is the specs on the pump. Dayton has put out a varity of pumps and the identification of the pump is critical. Once to pump specs are identified THEN pulley ratios can be discussed.

So find out all the information about the pump head you can and post it up. Pictures would be nice. Also if you have a two stage pump, is your tank rated for 200 psi working pressure? If you can give us a current reading off the running motor?

lg
no neat sigline