Rocks & mirror
Encyclopedia of Marine and Energy Technology



Hoisting devices used for cargo handling and other operations. Cranes are required to hoist, luff and slew. Separate motors are required for each motion.

Cargo cranes, cargo-handling cranes – Cranes for bulk cargo, containers, general cargo, or palletised cargo.

Construction cranes – Floating cranes for carrying out assembly-work in calm water as well as in unprotected waters.

Deck cranes – Cranes that do not handle cargo: provision cranes, hose handling cranes, etc.

Floating cranes – Usually barge type hulls provided with large cranes used for various heavy lift tasks, salvage and wreck removals. Semi-submersible crane ships are used to carry out offshore installation work.

Gantry crane – A hoisting device, usually on rails, having a lifting hook suspended from a car, which is movable horizontally in a direction transverse to its rails.

Gantry-type hatch cover crane – A deck crane used for handling the  hatch covers and portable  bulkheads.

Hose-handling cranes, manifold cranes – Cylinder-luffing cranes used to handle tanker cargo hoses. A hose crane must be explosion-proof. Consequently, hydraulic motors are usually supplied with fluid from a central pump unit located in a risk-free zone.

Monorail provision crane – Rail-mounted trolley that can be moved athwartship and is fitted with rack and pinion drive.

Offshore cranes – A range of shipboard cranes and floating cranes that work offshore, also cranes mounted on offshore installations.

Offshore cranes working on deck – Cranes on offshore installations not used as supply cranes because of their location.

Offshore supply cranes – Cranes located on fixed or floating offshore installations for loading and unloading supply vessels.

- 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.