A tank or tank system for storing a cryogenic liquid exhibiting at least one collecting container with an upper region and a lower region, so as to hold the cryogenic liquid, at least one arrangement for feeding and discharging liquids and at least one arrangement for feeding and discharging gases, wherein the tank further exhibits at least one frame structure comprising a thermal insulation material.

A tank or tank system for storing a cryogenic liquid exhibiting at least one collecting container with an upper region and a lower region, so as to hold the cryogenic liquid, at least one arrangement for feeding and discharging liquids and at least one arrangement for feeding and discharging gases, wherein the tank further exhibits at least one frame structure comprising a thermal insulation material.

A pressurized gas storage system is disclosed for maintaining a minimum pressure of a primary fluid (5). The system includes a pressurized gas tank (2) inside which is mounted a flexible bladder (4) which contains the primary fluid. The space between the gas tank and the bladder is considered a compression chamber (9) which contains a secondary fluid (7) that exerts pressure on the bladder to maintain a minimum pressure upon the primary fluid. The secondary fluid is supplied to and exits tank pressure chamber through a port (6). The flexible bladder is couple to inlet outlet port (8) extending to a pickup tube (10). The system also includes a pump (18), fluid reservoir (14), pressure relief valve (24) and controller (26) which functions to maintain the pressure of the secondary fluid. In a second embodiment, pressure is maintained through a second fluid absorbing and releasing material.