When you happen to have more than one tank available to fill PCP airguns. Use one tank (we will call Tank A) till the pressure is below the max filling pressure of your PCP airgun (different for all airguns but most are 3000 psi fill). Once that tank (tank A) is below the max pressure, use that tank to fill the bulk of the airgun to whatever the max pressure the tank holds and then top off with the second "fresh" tank (we will call Tank B).
With this method, this will maximize the air in either tanks.
Once that "fresh" tank (Tank B) is filled below the max pressure of the airgun, send the first tank (Tank A) to get fill and use that one to top off.
This just cycles back and forth. |