Apparatus and method for transporting high value liquified low boiling gases

A system for transporting a high value liquified gas product using a liquified gas product having a low value relative to said high value liquified product, comprising:

• a first vessel defining a first chamber, said first chamber having a majority of its volume occupied by a high value liquified gas product having a boiling point of lower than about -170.degree. C.;
• a second vessel defining a second chamber for containing said low value liquified product, said low value liquified product having a boiling point lower than the boiling point of said high value product, said second chamber being at least partially in heat exchange relationship with said high value liquified high product in said first chamber;
• a vent for releasing vaporized low value liquified product in response to an increase in temperature of said high value liquified product;
• and
• said second chamber being sized to contain an amount of said low value product to permit sufficient vaporization and venting of said low value product so as to maintain a substantially constant volume of said high value liquified product for a predetermined period of time.

A method of transporting a high value liquified gas product using a liquified gas product having a lower value relative to said high value product, comprising:

• providing a transportable containment apparatus comprising a first housing defining a first chamber for holding high value liquified gas product having a boiling point of less than about -170.degree. C. and a second vessel defining a second chamber for containing said low value liquified product, said low value product having a boiling point lower than the boiling point of said high value product;
• introducing liquified high value product into said first chamber to a desired, filled amount, said second chamber being at least partially in heat exchange relationship with said high value liquified product in said first chamber;
• releasing vaporized low value liquified product in response to an increase in temperature of said high value liquified product;
• and
• transporting said containment apparatus from a first location to a second location.