Helium SCUBA

        Helium SCUBA Storage Tank 242 Cubic Feet        

For a storage tank of 242 Cubic feet @ 2015 PSI, and a desired 33% of Helium: fill the 13 SCUBA Diving Tanks (80 Cu. Ft. @3000PSI) to the pressure in the first Orange background. Ex: the first 4 shown are 999 and the fifth ops tank is filled to 923.4 PSI, etc. The numbers that follow after the storage tank has dropped below the pressure required to get the percent desired, for the first storage tank are not important as you just equalize the empty SCUBA tank with the storage tank (only after the storage tank has dropped below the fill pressure for the desired % Helium). Filling the tanks slowly will minimize heating which can cause a false  (High) reading.

Then use the second storage tank to top off the tanks not at 33%.

When finished with the Helium fill the tanks to 3000 PSI with standard air. Always check the finished tanks with Oxygen and Helium Analyzers to verify fill and use Mixed gas computers properly adjusted for the mix indicated for SCUBA diving.