Types

There are different types of cranes that are used on cargo ships. They can be differentiated in terms of the type of load they lift:

Cargo cranes: These are cargo-handling cranes that are used to lift bulk cargo, containers, general cargo, or palletized cargo. They are usually fixed rotary cranes which can be operated independently or in pairs. In container ships, single cranes are required to lift 20 ft containers and double cranes to lift 40 ft containers (30 tons)

 

Twin cranes; Two cranes mounted on one platform, which can be rotated horizontally through 360°. Each crane can be operated independently, when required the two cranes can be linked together to operate in a twin mode. In this case, both cranes are controlled from the cab of one of them.

 

Deck cranes: These cranes are used to lift provisions and other items on the deck, but not the cargo. Cranes that do not handle cargo: provision cranes, hose-handling cranes, etc.

 

Hose-handling cranes: These are manifold-mounted cylinder-luffing cranes that are used to handle tanker cargo hoses. A hose crane should be explosion-proof therefore the hydraulic motors are usually located in a risk-free zone which supplies the operating fluid to the crane.

 

Engine Room Crane: The cargo ships are fitted with engine room cranes mainly as per the main engine specification. This is done so that the crane can lift all the individual parts of the engine during routine maintenance. Normally, the capacity range for these cranes is from o.5 to 15 tonnes.

The engine room crane consists of a motor coupled with a wire drum so that the motor can lift or lower the crane hoist by winding or unwinding the wire over the drum. The whole system is then fitted in a trolley. A remote is provided so that the crane can be operated from any position, thus allowing the user to keep a safe distance from the lifted load.

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