<b>Ship's Crane</b> Depending on the type of ship, loading and discharging is done through different handling equipment. These can be land or ship bound. Land-based handling facilities are, for example, container cranes for container handling or e.g. also pneumatic conveyors and belt conveyors for loading and unloading grain and similar bulk goods. General cargo, bulk cargo or even containers can be lifted on and off board by on-board crane systems. On-board cranes (also known as deck cranes) with rope luffing mechanisms are preferred; slewing cranes with a lifting capacity of> 150t are called heavy lift cranes that can carry up to 800t or more. The inclination of the crane jib is varied with the luffing mechanism. The statics are designed so that the incline can be changed under load. The boom is swiveled around the crane axis with the slewing gear. If there are several cranes on board, they are arranged in such a way that their conveying areas overlap in order to be able to serve the entire deck area. In order to avoid additional lifting work due to a vertical load movement when the crane arm is extended, the load path is kept as horizontal as possible during luffing. This is achieved by cleverly guiding the suspension and luffing cables. Crane structures are designed in solid wall or half-timbered construction. The former includes both those consisting of normal profiles or sheet metal girders and those made in cell, box or shell construction. Trusses are built out of triangles in a statically determined manner and viewed as trusses. In order to lift the load from or on board, it must be possible to turn the crane boom around the vertical crane axis. This is done by the slewing gear of the crane. This is where the bearing of the rotatable tower and the drive of the slewing gear are located.