Yea, my bad, I meant an 80cf/3000psi SCUBA tank. The two tanks I have are 68/3000 and 68/4500. I get pretty much an equal amount of fills in both.THE DRG said:Hey, Xmagman. Did you mean you use a 80cf/3000psi scuba tank? What size is you marker tank?
Actually you are off a little. A cubic foot is 12x12x12= 1728 cubic inches in a cubic foot. So there are 138,240 cubic inches of air in a 80cf scuba tank at 3000psi. 1 cubic inch equal 16.387064 cc so a 80cf scuba tank holds 2,265,347.7 cc's of air at 3000psi.it should work out like this: 12 ci in 1 cubic foot, so 80 cubic feet times 12 = 960 ci
so 960 / 68 = about 14 fills , the math is rite but i dont know if it works like that