초록 ▼

A double-walled thickener tank has an outer shell bottom and an inner shell bottom spaced to form interconnected or a discrete void space therebetwee. An incompressible load-carrying permeable material such as oil-impregnated sand is compacted in the void space(s) to provide a support for the inner

A double-walled thickener tank has an outer shell bottom and an inner shell bottom spaced to form interconnected or a discrete void space therebetwee. An incompressible load-carrying permeable material such as oil-impregnated sand is compacted in the void space(s) to provide a support for the inner shell bottom and confined fluid in the tank. Any leakage of fluid from the tank through the inner shell bottom is initially confined in the void space and conveyed down a slight slope on the top surface of the outer shell bottom so the leaking fluid drains into an interior space of a double-wall or single-wall discharge cone at the center of the tank where the leak and void spaces are accessed to detect any leaking of fluid from the tank. Various modifications utilize either a replacement of a new inner tank liner, a bottom sheet of imprevious material such as a plastic liner; a series of pie-shaped steel sheets forming each bottom; or a grooved concrete bottom, all providing a flat or inclined void space, with or without load-carrying permeable material therein, which is accessed for leak detection.

대표청구항 ▼

A dual-containment tank system for a solids/liquid loaded thickener/clarifier wherein solids settle within said tank system comprising: means for ground supporting a cylindrical tank shell having an upstanding continuous side wall; an inner tank shell bottom sealingly extending across a bottom of sa

A dual-containment tank system for a solids/liquid loaded thickener/clarifier wherein solids settle within said tank system comprising: means for ground supporting a cylindrical tank shell having an upstanding continuous side wall; an inner tank shell bottom sealingly extending across a bottom of said continuous side wall; a sludge drain extending through said shell bottom for removal of settled solids; an outer tank shell bottom generally co-extensive with and spaced from said first inner tank shell bottom to form a void space between said shell bottoms; the shape of the upper surface of the outer tank shell bottom corresponding generally to the shape of the lower surface of the inner tank shell bottom, with the inner tank shell bottom being generally nested in the outer tank shell bottom; means accessing said void space for detecting leaks of liquid confined by said continuous side wall and said inner tank shell bottom, further comprising a bed of compacted permeable material in said void space for providing support of said inner tank shell bottom; and in which said sludge drain comprises a spaced double-walled cone extending from said inner tank shell bottom, an interior of said cone being in flow communication with said void space and said means for detecting leaks.