Product Name: manhole with core

Relative to the floating roof tank, the combination of the manhole wall and the tank wall of the general type oil tank is through the wall of the tank. This kind of manhole is not conducive to lifting and sealing of the floating plate. With the core of manhole is the core board with a layer of the tank wall and equal in the Gaineijia radian manhole, and flush with the tank wall. In order to facilitate opening and closing, a swivel arm and a lifting lug are also arranged on the aperture combined cylinder body, and the manhole cover does not leave the oil tank when the operation is in operation. There are at least 2 manholes in the inner floating roof tank. One is about 700mm from the bottom of the tank, which is used to clean the oil tank and the maintenance personnel. A distance of about 2400mm from the bottom of the tank is used for the operator to lift the floating plate.