Compression of indifferent gases with vapor control

A method for compressing an indifferent gas while controlling the concentration of vapor in the compressed gas, the method comprising:

• a. providing a source of said gas;
• b. delivering said gas from said source into a first chamber until said gas in said first chamber reaches a first predetermined pressure, wherein said first predetermined pressure is less than or equal to the pressure of the gas source;
• c. introducing a compression liquid into said first chamber to compress said gas, thereby increasing its pressure;
• d. permitting said gas, during compression, to flow from said first chamber to a second chamber through a first means of fluid interconnection that permits said gas to flow into but prevents said compression liquid from entering said second chamber, such that pressures in both chambers substantially equalize and rise concurrently until a second predetermined pressure is achieved in said second chamber, wherein said second pressure is selected such that the vapor concentration in said gas inside said second chamber is at or below a predefined concentration level;
• e. closing said first means of fluid interconnection when the pressure in said second chamber reaches said second predetermined pressure level, thereby isolating said gas in said second chamber from said gas and said compression liquid in said first chamber;
• f. transferring said isolated gas from said second chamber to a storage tank through a second means of fluid interconnection, wherein said gas in said storage tank is at or below a third predetermined pressure level that is less than said second predetermined pressure level, and wherein the vapor concentration in said gas inside said storage tank is at or below said predefined concentration level.