Patent ID: 6260564
Filing Date: 2001-07-17
Classification: C23G

Abstract:
A device for closing an oblong tank (1) containing a corrosive product, whereas the said tank (1) comprises a rectangular bottom (2) surrounded by a lateral wall (3) with an upper rim and comprising two longitudinal sides (31) and two extreme transversal sides (32) delineating an upper aperture (4),whereby the closing system comprises:at least two successive lids (5) extending respectively on either side of at least one sealing plane P, whereas each lid (5) has a lateral rim comprising two longitudinal sides (6) and at least one transversal side (8) extending along the sealing plane P,two longitudinal U-section gutters (7), arranged respectively along the upper rims of both longitudinal sides (31) of the lateral wall (3) of the tank (1),at least one medial transversal gutter (12) extending along at least one sealing plane P between both longitudinal gutters (7),whereby the said longitudinal (7) and transversal (12) gutters are filled with water,whereby the longitudinal sides (6) and at least one transversal side (8) of each lid (5) engage, upon closing, respectively into the said longitudinal (7) and transversal (12) gutters in order to constitute an efficient `water seal` on at least three sides of the said lid (5).