Core-equipped manhole

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Compared to floating roof tanks, the cylinder that connects the manhole of conventional tanks to the tank wall passes through the tank wall, and such manholes are not conducive to the lifting and sealing of the floating deck. A core-manhole features an additional core plate inside the manhole cover, with a curvature equal to that of the tank wall, and it is level with the tank wall. To facilitate opening and closing, a rotating arm and lifting lugs are also installed on the opening, integrated with the tank body, so that the manhole cover remains in place on the oil tank during operation. Manholes for internal floating roof oil tanks are generally provided in at least 2 numbers: one located about 700 mm above the tank bottom, used for cleaning the tank and allowing maintenance personnel to enter ； One is located about 2400 mm from the bottom of the oil tank, for operators to board the floating deck. Compared to floating roof tanks, the cylinder that connects the manhole of conventional tanks to the tank wall passes through the tank wall, and such manholes are not conducive to the lifting and sealing of the floating deck. A core-manhole features an additional core plate inside the manhole cover, with a curvature equal to that of the tank wall, and it is level with the tank wall. To facilitate opening and closing, a rotating arm and lifting lugs are also installed on the opening, integrated with the tank body, so that the manhole cover remains in place on the oil tank during operation. Manholes for internal floating roof oil tanks are generally provided in at least 2 numbers: one located about 700 mm above the tank bottom, used for cleaning the tank and allowing maintenance personnel to enter ； One is located about 2400 mm from the bottom of the oil tank, for operators to board the floating deck.