Storage and transportation of liquid CO.sub.2

A storage system for storage of liquid CO.sub.2 at low pressure, said storage system comprising:

• a pressure vessel having inlet means and outlet means for filling said vessel, said inlet means comprising a conduit having an opening communicating with the interior of said vessel adjacent a bottom wall of said vessel and said outlet means having an opening communicating with the interior of said vessel adjacent an upper wall of said vessel;
• a cooling means located within said vessel in an upper part thereof in a region normally occupied by gaseous CO.sub.2 ;
• a liquid level indicating device extending through said pressure vessel to adjacent the bottom wall thereof;
• and
• a supply conduit for supply of gaseous CO.sub.2 from the pressure vessel, said supply conduit communicating with a region normally occupied by said gaseous CO.sub.2, the supply conduit being branched into two lines, one line containing an isolation valve and the other line containing a pressure actuatable switch which is operable when a predetermined pressure is reached within the pressure vessel to actuate the cooling means.