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A crane vessel, crane ship, crane barge, or floating crane is a ship with a crane specialized in lifting heavy loads, typically exceeding 1,500 t (1,476 long tons; 1,653 short tons) for modern ships. The largest crane vessels are used for offshore construction .
A level-luffing crane is a crane mechanism where the hook remains at the same level while luffing: moving the jib up and down, so as to move the hook inwards and outwards relative to the base. [ 1 ] Usually the description is only applied to those with a luffing jib that have some additional mechanism applied to keep the hook level when luffing.
Small Titan or hammerhead crane. The ultimate development of the dedicated block-setting crane was the hammerhead or 'giant cantilever' Titan crane. These had a deep double truss as a cantilever beam atop a large diameter roller bearing, on a carriage similar to that of the Hercules. The upper edges of the two trusses formed a set of rails for ...
The Hammerhead crane at the PSNS & IMF in Bremerton in April. The shipyard is planning for a major renovation and modernization known as SIOP, which will span years, and recently put out a request ...
Sleipnir is equipped with a third, auxiliary, crane at the opposite end of the ship, near the berths. The auxiliary crane is capable of lifting (or lowering) 70 t (77 short tons) at a radius up to 12 m (39 ft) down to 2,000 m (6,600 ft) below the waterline; capacity reduces to 25 t (28 short tons) at 60 m (200 ft) radius and 8 t (8.8 short tons ...
Hammerhead initially was ordered as a unit of the Balao class, but her builder, the Manitowoc Shipbuilding Company, did not receive the drawings for the Balao class from the Electric Boat Company in time to build Hammerhead or the submarines USS Golet (SS-361), USS Guavina (SS-362), and USS Guitarro (SS-363) to the new design, so they were built as Gato-class submarines.
In sailing, luffing refers to when a sailing vessel is steered far enough toward the direction of the wind ("windward"), or the sheet controlling a sail is eased so far past optimal trim, that airflow over the surfaces of the sail is disrupted and the sail begins to "flap" or "luff" (the luff of the sail is usually where this first becomes ...
Shipyard cranes Hammerhead cranes for Rosyth Dockyard, 120 ton max lift or 180 ft radius built 1965. and HMNB Devonport in Plymouth, 1,450 tonnes of structure with a lift of 80 tonnes. Recently dismantled. [12] [13] Fire grates & household ironmongery merchants; Offshore platform cranes (made up until closure of works) Pump units (now made by ...