How long will it take to depressurize a 600 gallon air tank from 110 psi to 90 psi?

Answer 1

You can calculate the amount of available air by the following:

SCFavailable=Volume of tank(cf)x((P2-P1)/Patm)

Volume=600 gal/(7.5 gal/cf) = 80 cu.ft.

P2=Compressor High Set Point = 110 psi

P1=System Pressure Requirement = 90 psi

Patm= Depends on your location, but I'll assume 13.16 psig @ 3000'

Available Air = 121.6 cu.ft.

Divide by your calculated peak air consumption rate, I will assume 10 scfm.

121.6 cu.ft./10 scfm = ~ 12 minutes

You can calculate the time of recovery for your system by dividing by the amount your compressor supply rate.

If your air compressor is rated for 30 scfm @ 110 psi and you are continuously consuming 10 scfm while recovering at 30 scfm then take the available air and divide by the difference of your recovery rate and your consumption rate.

In this case it would take 6 minutes to fill your tank.

Your duty cycle for this example would be run time divided by total time or

6min/18min = 33% duty cycle so I would look for a 50% duty cycle rated compressor.

Hope this helps.

Answer 2

The time it takes to depressurize a tank depends on factors like the size of the opening, pressure difference, and air flow rate. For a rough estimate, assuming a steady flow rate, it might take a few minutes to depressurize a 600 gallon tank from 110 psi to 90 psi.