a 3,000 PSI 220 cu. ft. nitro bottle holds 15 gal of air at 3,000PSI

Hope that helps you calculate fill times.

below is an example,

to get to your tank size,

start pressure * tank volume = new pressure * truck tank size

3,000PSI * (scuba) 5 gal = X * 12 gal (my tank sixe)

15000 /12 = X

X 1250

so 1250PSI at 12 gal

above broken down is 1250 PSI at 12 gal (for a scuba tank)

all you do if volume is the same is subtract the PSI make sense?

so if you want to fill a 12 gal tank from 110-145 that is 35 PSI of fill

so take 1250/ 35 = 35.71 filles before the tank is empty.

or 8 fills from 0~145

Nitro 220 cu ft.

3750 PSI 12 gal tank

110-145 107 fills on 12 gal system tank.