Apparatus and system for the storage and supply of liquid CO.sub.2 at low pressure for extinguishing of fires

A fire extinguishing system for storing and supplying a correct amount of liquid CO.sub.2 at low pressure to at least two risk sites, said system comprising:

• two or more low pressure vessels, each pressure vessel of said two or more pressure vessels including a supply conduit for supplying the liquid CO.sub.2, said supply conduit extending into a lower portion of said pressure vessel, inlet means for filling said pressure vessel, and cooling means for cooling the liquid CO.sub.2 stored in said pressure vessel;
• a manifold coupled to said two or more pressure vessels, said manifold being in fluid communication with each of said supply conduits;
• a conveying conduit for conveying the liquid CO.sub.2 from said manifold to each of said at least two risk sites;
• at least one risk site sensor located in each of said at least two risk sites;
• one or more discharge nozzles coupled to each of said conveying conduits for discharging the liquid CO.sub.2 conveyed therein;
• one or more pressure vessel sensors to sense variations from one or more predetermined operational parameters of said two or more pressure vessels;
• two or more valves actuable in response to operation of said at least one risk site sensor at any of said at least two risk sites to release a flow of the liquid CO.sub.2 into respective said conveying conduits, and wherein, in use, any of said two or more valves is selectively operable upon activation of said at least one risk site sensor at any of said at least two risk sites;
• and
• computing means coupled to said risk site sensors and said valves for selective direction to at least one of said at least two risk sites from any one or more of said low pressure vessels the correct amount of the liquid CO.sub.2 for said at least one of said at least two risk sites, said selective direction being controlled by said computing means as a function of risk site volume.