Abstract: An apparatus and system stores and supplies liquid CO.sub.2 at low pressure for extinguishing fires. The apparatus comprises a pressure vessel (13) for storing liquid CO.sub.2 at low pressure, a cooling device (29) in contact with gaseous CO.sub.2 in the vessel to maintain the low pressure, an inlet (24) and outlet (32) to fill the vessel and a supply conduit (17) communicating with a lower portion of the interior of the vessel to allow liquid CO.sub.2 to pass from the vessel and into a reticulation system. A number of pressure vessels can be coupled together through a manifold (165) to provide the required amount of liquid CO.sub.2 to a risk site. Supply valves (18) or manifold valves (173, 174) can be operated by a sensor (175, 176) in a risk site and a logic processor (177) can be used to regulate the valves and thereby the liquid CO.sub.2. The apparatus and system is particularly designed as a replacement for current halon systems which cause damage to the ozone layer.

Abstract: A system for transportation and storage of liquid carbon dioxide (CO.sub.2) at low pressures in the region of 1600-2300 KPa comprises a mobile supply tank (20a, 20b) and an on side storage tank (70). The mobile supply tank (20a, 20b) and the on site storage tank (70) are thermally insulated and each tank is refrigerated by a refrigeration system (71) with an evaporator located in the upper gas space of each tank. The on site storage tank (70) is filled with liquid CO.sub.2 by a conduit (36a) extending from near the bottom of the mobile supply tank (20a, 20b) via a filling port (72) on the on site storage tank to an opening near the bottom of the on site storage tank. A closed circuit system is achieved by a further conduit (37a) extending via an outlet port (73) from the gas space near the top of the site storage tank (70) to a gas space near the top of the mobile supply tank (20a, 20b).