[KrazyCarl92]

Keep in mind the difference between gauge and absolute pressure, and your calculations will work out pretty well (or they have for us in the past). 60 psi gauge pressure is 74.7 psi actual pressure, and 120 psi gauge pressure is 134.7 psi actual pressure. This means each cu. in. of storage air corresponds to roughly 1.8 cu. in. of air in max working pressure. Another source of error in these calculations is assuming that the air is behaving as an ideal gas, but this is close enough for determining the number of storage tanks needed on an FRC robot, especially considering it makes sense to include a safety factor anyway.