Thermally insulated tank for land storage of low temperature liquids
AssigneeGaz Transport
InventorPierre Jean
Life of this patent
Estimating the term…
Abstract
An upright tank of cylindrical or prismatic form has a sealed inner wall surrounded by insulation, and an outer casing. The bottom of the inner wall is formed from parallel strips of INVAR welded together at inturned flanged edges and is mounted in sliding relation to insulation beneath the bottom. The inner side wall is formed from parallel vertical bands of stainless steel with inwardly bent margins welded together and slidingly supported vertically to permit expansion and contraction. The inner side wall is joined to the inner bottom wall by a corner angle assembly including sheets and angles of INVAR supported by an annular beam. The annular beam includes straight beam sections supported at their ends by gussets which in turn are anchored to the exterior casing of the tank.
Claims15
A tank for static storage of a liquid at low temperature,
- said tank comprising an upright side wall and a bottom,
- said side wall comprising
- an exterior casing,
- an internal wall forming an impermeable barrier, and
- thermal insulation between said casing and said internal wall,
- said bottom of the tank comprising
- a horizontal bottom wall forming an impermeable barrier at the bottom of the tank, and
- thermal insulation beneath the bottom wall, said internal wall comprising
- a plurality of parallel bands of thin stainless steel, said bands extending vertically and each having side flanges, and
- welds along said flanges to seal said internal wall,
- said bottom wall comprising a plurality of parallel bands of thin metal having a very low coefficient of thermal expansion, said bands of said bottom wall each having side flanges, said side flanges being welded to seal said bottom wall,
- a corner structure connecting said side wall to said bottom wall in sealed relation and comprising,
- an annular beam supported by thermal inlation and comprising a plurality of rigid beam sections, adjacent facing ends of adjacent beam sections being secured together by a common gusset so that each end of a beam section is attached to a gusset, each beam section having attached thereto an L-shaped angle assembly of a material of low thermal expansion and presenting a vertical leg and a horizontal leg, and
- a vertical lining strip comprised of flanged sheets in side by side relation and of the same width respectively, as the stainless steel bands of said inner wall,
- said flanged lining sheets extending generally vertically between said angle assembly and said inner wall, being welded along their edges, and being welded to said vertical leg of said angle assembly and to said stainless steel bands of said side wall,
- means for securing each gusset to said outer casing with anchoring elements arranged symmetrically with respect to a radial plane of the tank at regularly spaced intervals around the periphery of the tank, adjacent anchoring elements of two adjacent gussets located at each end of a beam section being secured to a common anchor plate secured to the external casing of the tank, and
- means mounting said side wall and said bottom wall on sliding joints for sliding movement with respect to said thermal insulation.
Dependencies are inferred from the claim text.