When the ship is sailing, the stern bearing and sealing device are easy to heat, and must be lubricated and cooled. Although there are many types of stern tube devices, there are only two kinds of lubricants: water and oil. Different lubricants have different lubrication and cooling methods, which are described below....

Dock inspection is a very important ship inspection, that is, dock repair inspection. Dock inspection generally refers to the relevant inspection of the ship in the dry dock, including the external inspection of the ship bottom and the classification dock inspection. After obtaining the approval of the classification society and the flag state, the external inspection of the ship bottom and the dock inspection of the classification can also be carried out when the ship is floating (underwater inspection)....