| 摘要 |
921,336. Storing liquefied gas. CHICAGO BRIDGE & IRON CO. June 13, 1961 [Dec. 14, 1960], No. 21220/61. Class 8(2). [Also in Group XXIX]. A storage tank for liquefied gas, for example, comprises an inner storage vessel 12 and an outer shell 11 spaced from the vessel 12, the latter being anchored by substantially vertical tie bars 38 which are connected at their upper ends to the vessel 12 and extend downwardly through a foundation 15 for the vessel 12 to a laterally extending beam structure 30 underlying but spaced from the vessel 12. The foundation 15 which may comprise layers of perlite concrete rests upon the bottom 19 of the shell 11. Heating coils (not shown) may be provided in the ground to prevent it freezing. The outer shell is supported on concrete 16 to which it is anchored by bolts 17. The beam structure 30 comprises a plurality of beams 31 attached to the outer shell 11 and, optionally, a circular ring 32 and cross beams 33. The tie bars 38 are disposed so as to be free to bend when the vessel 12 expands or contracts, or rigid tie rods may be provided which are fitted with rollers. In a second embodiment, Fig. 11 (not shown), the inner vessel foundation comprises a layer of perlite concrete upon a rigid insulation layer which is disposed above a layer of reinforced concrete; the tie bars are secured in the latter and extend through holes passing through the other two layers, the holes containing resilient insulation material. The tank may be used for high temperature storage service where the inner vessel is subject to gas pressure.
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