Plastic tank for the storage and transport of bulk material

A plastic tank for the storage and transport of bulk materials, such as solids, liquids or semi-liquids comprising:

• a) a main body (1) having a rectangular base (18) with integrally built-in at least four legs (20), four sidewalls (11a, 11b, 12a, 12b) extending in trapezoid shape upwardly and outwardly from the base (18), and defining a rectangular top opening, which forms a body-rim (15) provided with a projecting edge (16) along the periphery of the body-rim (15), wherein said base (18) with said at least four legs (20) have a pallet type configuration, the bottom surface of the base (18) is externally reinforced with base ribs (19) molded in both directions, and said four sidewalls (11a, 11b, 12a, 12b) are provided with webbed ribs (13) molded across their external surface so as to provide great strength and stability to the main body (1);
• b) a main rectangular lid (2) having a top surface, a bottom surface, an eccentric round opening (30) for filling up the tank and a main-lid rim (31) with a main-lid groove (14) along the periphery of said main rectangular lid (2) and a main-lid rubber gasket (71) that fits in said main-lid groove (14), wherein said main lid (2) is attached to the open top of the main body (1) and is closed with safety-lock pins (8) secured along the body-rim (15) of said main lid (2) and the main-lid rim (31) of the main rectangular lid (2), said safety-lock pins (8) in conjunction with the main-lid rubber gasket (71) provide a watertight sealing to the tank, the bottom surface of the main lid (2) comprises webbed ribs (36) molded in both directions so as to control internal forces when the tank is loaded, the top surface of the main lid (2) comprises feet sockets (27) molded on the four corners so as to receive the feet of the upper tank during stacking, and the round opening (30) is provided with a round lid groove (34) around the its periphery to hold a round-lid rubber gasket (72) around the periphery of the secondary round lid (3) for a watertight seal when closed;
• and
• c) a secondary round lid (3) that fits in the eccentric round opening (30) of the main rectangular lid (2) comprising a vent hole (22) sealed with a vent cap with a gas extraction valve (4) to facilitate the outflow of the fermentation gases formed inside the tank, wherein said base (18) with the at least four legs (20) and the four sidewalls (11a, 11b, 12a, 12b) are made of plastic molded in one-piece, one of the sidewalls of the main body (1) adjacent to the base (18) of the main body (1) of the tank comprises a discharge opening (17) that can be equipped with a drainage valve (50) in order to empty the liquids inside the tank, and said at least four legs (20) of the base surface further comprise detachable and replaceable feet plugs (5) suitable to be plugged in said legs (20).