| 摘要 |
<p>919,755. Storing liquefied gases. CONCH INTERNATIONAL METHANE Ltd. July 18, 1961 [Sept.12, 1960], No. 25951/61. Class 8(2). [Also in Groups XXIX and XXXIII]. A system for protection against leakage of cold liquid, e.g. liquefied gas, from a storage tank 10 which is mounted within a thermally insulated space with the side walls of the tank being spaced from the insulation 16, comprises a liquid receiving means adjacent the bottom of the tank extending beyond the side walls of the latter and upwardly into the space 28 about the tank, and means for removing liquid from the liquid receiving means. As described, the tank is housed within the hull 14 of a ship which is lined with the insulation 16, e.g. balsa wood, the tank having an inlet pipe 18, a discharge pipe 24 and a vent pipe 25. The liquid receiving means is in the form of a receptacle 30 having a bottom wall 32 and side walls 34. The receptacle may be of metal, wood or plastic and may be reinforced. The bottom of the tank rests upon beams 38 supported on the bottom wall 32 of the receptacle. Alternatively, the beams 38 may be omitted, the tank resting on the bottom wall 32, or the bottom wall of the tank may be extended beyond the side walls thereof replacing the bottom wall of the receptacle, Fig. 2 (not shown), or the receptacle may be formed by a membrane, e.g. a film of metal or plastics, supported by and fixed to the insulation 16. Keys and keyways may be provided between the tank and the supporting floor 37. One or more drains 40 are provided in the receptacle, leading to a pump 44 which returns liquid collected in the receptacle through a pipe 46 to the tank 10 or to other receivers or to a pipe 47 having its outlet extending rearwardly of the ship. The pump 44 may be automatically started when the cold liquid contacts electrodes 50, 52; alternatively, a thermocouple may be used to start the pump. The side walls of the receptacle may be inclined outwardly towards the insulation 16 and the inner surface of the latter may be covered with a liquid and vapour impervious layer, e.g. a membrane of aluminium. More than one tank may be mounted in the insulated space and the liquid receiving receptacle may be provided for each tank or for each one of groups of the tanks or for all the tanks. The ship may be of double hull construction. Specifications 853,367 and 854,705 are referred to.</p> |
