A sludge digester including a vessel and floating cover. The vessel includes a sidewall and an interior volume configured to receive and contain sludge. According to one embodiment, the cover comprises a frame structure that is constructed and arranged to form a skirt member formed at a periphery of the cover and extending downwardly into the vessel, and a continuous ballast ring attached to a lower portion of the skirt member and configured to form a trough member with an interior surface of the skirt member. The sludge digester may also include a guide system coupled to the sidewall and the skirt member and configured to allow vertical displacement of the cover with change in volume of at least one of a gas and a sludge contained in the vessel beneath the cover.

A sludge digester including a vessel and floating cover. The vessel includes a sidewall and an interior volume configured to receive and contain sludge. According to one embodiment, the cover comprises a frame structure that is constructed and arranged to form a skirt member formed at a periphery of the cover and extending downwardly into the vessel, and a continuous ballast ring attached to a lower portion of the skirt member and configured to form a trough member with an interior surface of the skirt member. The sludge digester may also include a guide system coupled to the sidewall and the skirt member and configured to allow vertical displacement of the cover with change in volume of at least one of a gas and a sludge contained in the vessel beneath the cover.

Method and apparatus for raising a floating roof included in a storage tank whereby a first and a first opposite force are applied between a floor in the storage tank and an internal surface of the floating roof. An additional set of forces are also provided and are constrained according to the first and first opposite force, not only in magnitude, but in position. By constraining these forces to be applied orthogonally to the floating roof, horizontal shear forces can be resisted thus reducing the likelihood of failure of a cribbing unit. By increasing these forces, the roof is raised.

Method and apparatus for raising a floating roof included in a storage tank whereby a first and a first opposite force are applied between a floor in the storage tank and an internal surface of the floating roof. An additional set of forces are also provided and are constrained according to the first and first opposite force, not only in magnitude, but in position. By constraining these forces to be applied orthogonally to the floating roof, horizontal shear forces can be resisted thus reducing the likelihood of failure of a cribbing unit. By increasing these forces, the roof is raised.

A shoring structure for insertion inside a tank through a manway of the tank and for installation under the floating roof of the tank. This shoring structure has: a telescoping upright structure made of detachable elements; and these detachable elements being configured for movement through the manway of the tank. Foldable top and bottom panels are mountable to the telescoping upright structure, the top and bottom panels being also respectively configured for movement through the manway of the tank. The foldable bottom plate being configured for integration of a pallet jack thereto, for movement of the shoring structure in a raised position inside the tank when the top and bottom panels being mounted to the upright structure. In another aspect, there is provided a combination of a shoring structure and a pallet jack incorporated in this shoring structure. Also described is a method of inspecting or maintaining a tank.

A shoring structure for insertion inside a tank through a manway of the tank and for installation under the floating roof of the tank. This shoring structure has: a telescoping upright structure made of detachable elements; and these detachable elements being configured for movement through the manway of the tank. Foldable top and bottom panels are mountable to the telescoping upright structure, the top and bottom panels being also respectively configured for movement through the manway of the tank. The foldable bottom plate being configured for integration of a pallet jack thereto, for movement of the shoring structure in a raised position inside the tank when the top and bottom panels being mounted to the upright structure. In another aspect, there is provided a combination of a shoring structure and a pallet jack incorporated in this shoring structure. Also described is a method of inspecting or maintaining a tank.

A number of implementations of an apparatus for supporting a floating roof in a storage tank are described. In one implementation, the apparatus includes at least two vertical support members coupled together at the top and bottom by spans members.

A number of implementations of an apparatus for supporting a floating roof in a storage tank are described. In one implementation, the apparatus includes at least two vertical support members coupled together at the top and bottom by spans members.

Equipment (1) for storing a liquid (L) includes a storage tank (2) having a bottom (4) from which a cylindrical wall (6) closed by a ceiling (5) rises, the tank being provided with washing nozzles (10) and with at least one liquid supply inlet (8) and at least one liquid outlet (9); a cover (3) mounted inside the tank and arranged to float on the liquid present in the tank; the cover (3) being mounted in the tank to delimit with the cylindrical wall, a communication space (11) on either side of the cover, configured to allow the vertical displacement of the cover when the level of the liquid changes in the tank and in that the equipment includes a system (12) for bearing the cover on the bottom of the tank keeping the lower face (3a) of the cover at a distance from the bottom of the tank.

Equipment (1) for storing a liquid (L) includes a storage tank (2) having a bottom (4) from which a cylindrical wall (6) closed by a ceiling (5) rises, the tank being provided with washing nozzles (10) and with at least one liquid supply inlet (8) and at least one liquid outlet (9); a cover (3) mounted inside the tank and arranged to float on the liquid present in the tank; the cover (3) being mounted in the tank to delimit with the cylindrical wall, a communication space (11) on either side of the cover, configured to allow the vertical displacement of the cover when the level of the liquid changes in the tank and in that the equipment includes a system (12) for bearing the cover on the bottom of the tank keeping the lower face (3a) of the cover at a distance from the bottom of the tank.