Depressurization system, apparatus and method for high pressure gas delivery

An apparatus for depressurizing a pair of accumulators to provide high pressure gas, comprising:

• a gas buffer tank in fluid communication with each one of the pair of accumulators for receiving vapor from the pair of accumulators for storage and dispensing the vapor to a condenser, to condense the vapor into a liquid, other than the pair of accumulators and external atmosphere;
• a first fluid connection including a first valve assembly interconnecting the gas buffer tank and a first accumulator of the pair of accumulators;
• a second fluid connection including a second valve assembly interconnecting the gas buffer tank and a second accumulator of the pair of accumulators;
• a receiver tank in fluid connection with the condenser for receiving and storing the liquid until needed by the first accumulator and the second accumulator;
• wherein the first fluid connection with the first valve assembly and the second fluid connection with the second valve assembly are each constructed and arranged to deliver the vapor from a corresponding one of the first accumulator and the second accumulator to the gas buffer tank during alternating intervals.