You are not wrong, with additional pressure comes harder pumping effort. And, if the pump struggles at higher pumping pressures and bypasses/leaks air, then yes, it will definitely take more pumps. But, it does not matter the volume or the pressure of the tank bring hand pumped. The volume of high pressure air being replaced is going to be the same volume that was used or transferred.As the pressure increases the pumping gets progressively more and more difficult...and the volume of the tank size will dictate how much pumping will be required to fill that volume at a given pressure...going to 250 bar in a 250cc tube is one Sam Hill of a lot quicker than to 250 bar in say a 100 cubic foot tank...try it some time and count your strokes going to the same pressure but different volumes....that's why the pump fill hose fills to pressure so quickly...low volume.
For example, if you start out with a 97 cf tank filled tank to 300 bar, and happen to fill a gun's 65 cc cylinder to 250 bar on 3 occasions, using 50 CC's of air for each fill, the volume of air that is transferred from the 300 bar tank to fill to 250 bar is limited to what the smaller tank requires (50 cc's × 3). The 97 cf tank will still require the same amount of air volume replaced that was transferred to fill the smaller tank to get back up to the original 300 bar pressure. So if 150 cc's we're used total, then only 150 cc's are required to be replaced to achieve 300 bar.
Last edited:
Upvote 0