Spanish technology for large tankers of the future
The Knock Nevis is the largest tanker in the world ever built, so that its dimensions (468 meters in length, sleeve 67 and 24 draft) were impossible to pass through the Suez Canal or Panama. After more than three decades operating it was sold to an Indian company for scrapping.
With capacity to transport more than 500,000 tons of crude belonged the family of the ULCC (Ultra Large Crude Carrier), one of thirteen classifications of this type of vessel – like gas tankers and freighters – according to their volume of cargo. On April 26 Navantia began the construction of the first of the tankers Suezmax (those who can pass through the Suez canal, with a capacity of up to 200,000 tons) that the public shipyard signed with Ondimar transport maritime LDA (shipping company of the Ibaizabal group) of a total of four.
Contracts that translates into 3 million hours of work for the manufacturer and the industry side of the Bay of Cadiz and the ría de Ferrol shipyard. A landmark bearing in mind which is its return to the civil construction after 20 years focused only on civil business. Spanish technology sends as well in the large oil of the future. The introduction of these shipping meant a real revolution at the end of the 19th century, as many of the world’s economies are dependent on business known as ‘black gold’, and is the only way of transporting large amounts of crude oil. But, how is built a tanker? they are big words.
Intended for the loading of crude oil or byproducts, currently requires its double hull construction. More than one lesson was the experience of the Prestige, sunk off the Galician coast on November 13, 2002. The reason is none other than the monocoque design presents a greater sensitivity to damage in accidents and, in consequence, to cause devastating spills from the environmental point of view.
Construction by bloques
Many are the guidelines used in this type of construction for your design. A job that requires special planning by the team of engineers responsible for the initial phase of the project, as each of the pieces shaped by computer should be classified in detail to then play is life-size. Given its size, this type of ships are built by blocks which are then assembled with cranes in dry dock.
The framework that is used in the majority of cases is a longitudinal system. That is, large structural steel beams that run the boat from bow to stern form longitudinal and transverse, with compartments where different, the cargo tanks (that will house the raw) are then made and the ballast (water).
Structures that van lined with steel sheets that are welded to giving shape to the helmet. The next phase is the installation of a top plate that covers this «first floor», by way of double bottom, as a precaution against possible discharges. Once painted the block it is the turn of heavy machinery that will place it in its final position for later Assembly.
They are slow boats. Unlike the container which should be faster to deliver cargo on time, this end is a problem for this type of boats that usually carry a diesel engine and a propeller for propulsion. Average speed reaches just 14 knots. Already the cover shows a bow flat and an intermediate area for maneuvers, where charging hoses are located and download.
Stern is perhaps the most visible part of the design of construction, because therein lies the bridge and the area of empowerment of the boat (crew accommodation), right on the top of the engine room (the height of the double bottom in this area is equal to the load) which goes under cover and beside helix.