Abstract 1,054,731. Storing liquefied gases. GAZ DE FRANCE-SERVICE NATIONAL. Jan. 20, 1965 [Jan. 22, 1964], No. 2529/65. Heading F4P. The central portion of a heat insulated impervious roof 22, Fig. 2 (not shown), covering a ground storage reservoir 10 holding liquid methane floats on the surface of the liquid and is connected to the rim 18 of the reservoir by a flexible sealing joint 26. The central roof portion is formed of aluminium plates 33, 34 faced inwardly with textile fabric, outwardly with plastic sheeting and separated by concentric metal tubes 38 and by perlite. The joint 26 comprises panels 46, 48, Fig. 3 (not shown) of metal foil lined with textile and plastic material and are spaced by concentric tubes 44 similar to tubes 38 and by perlite. The peripheral panels of the joint are juxtaposed to form a skirt 50 which dips into an icefilled gutter 52 protected from ambient heat by insulation 56. The external side wall 16 of the reservoir is coated with fibre glass 20. In a modification the central portion of the roof is provided with concentric corrugations and the joint is sealingly covered by a flexible sheet through which compressed nitrogen is passed.
A TANK FOR THE STORAGE OF LIQUEFIED GASES AT LOW TEMPERATURE COMPRISING A SHALLOW BASIN DUG BENEATH THE LEVEL OF THE GROUND, A PERIPHERAL BANK RAISED ABOVE SAID GROUND LEVEL FOR CONFINING SAID LIQUEFIED GAS IN SAID BASIN, HEAT-INSULATED FLUID-TIGHT COVER MEANS FLOATING ON THE FREE UPPER SURFACE OF SAID LIQUEFIED GAS AND ADAPTED TO FOLLOW THE DISPLACEMENTS OF THE LATTER, AND SEALING MEANS CONNECTING THE OUTER PERIPHERY OF SAID COVER MEANS TO SAID PERIPHERAL BANK, SAID COVER AND SEALING MEANS COMPRISING AT LEAST TWO FLUID-TIGHT SHEET ASSEMBLIES HAVING CONFINED THEREBETWEEN A LAYER OF INSULATING MATERIAL, SAID SHEET ASSEMBLIES EACH CONSISTING OF A COMPOSITE SHEET FORMED OF AT LEAST A METAL SHEET APPLIED TO AT LEAST ONE FACE OF A PLASTIC FILM.
Claim 2
Dependent Claim
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A TANK FOR THE STORAGE OF LIQUEFIED GASES AT LOW TEMPERATURE COMPRISING A SHALLOW BASIN DUG BENEATH THE LEVEL OF THE GROUND, A PERIPHERAL BANK RAISED ABOVE SAID GROUND LEVEL FOR CONFINING SAID LIQUEFIED GAS IN SAID BASIN, HEAT-INSULATED FLUID-TIGHT COVER MEANS FLOATING ON THE FREE UPPER SURFACE OF SAID LIQUEFIED GAS AND ADAPTED TO FOLLOW THE DISPLACEMENTS OF THE LATTER, AND SEALING MEANS CONNECTING THE OUTER PERIPHERY OF SAID COVER MEANS TO SAID PERIPHERAL BANK, SAID COVER AND SEALING MEANS COMPRISING AT LEAST TWO FLUID-TIGHT SHEET ASSEMBLIES HAVING CONFINED THEREBETWEEN A LAYER OF INSULATING MATERIAL, SAID SHEET ASSEMBLIES EACH CONSISTING OF A COMPOSITE SHEET FORMED OF AT LEAST A METAL SHEET APPLIED TO AT LEAST ONE FACE OF A PLASTIC FILM.