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Maersk AHTS vessels get additional muscle

As announced in March 2012, Maersk Supply Service has won three new major contracts with the Brazilian state - owned oil company Petrobras (Petroleo Brasileiro S/A). The three ships to be deployed offshore Brazil, to meet the contractual commitments have been brought to "Remontowa" for preparations.



All the three mentioned contracts will include anchor handling tug supply vessels of Maersk Supply Service's L-class, namely: Maersk Leader, Maersk Lancer and Maersk Launcher. The vessels will be involved in ultra-deep water anchor handling with both conventional and torpedo anchors.
These vessels represent a series of five 90 m long and 23 m wide, DP2 units built at German yard Volkswerft Stralsund (recently known as P+S Werften) in 2009 and 2010. They feature deadweight of 4500 t, gross tonnage of 6821 and are fitted with towing and anchor handling winches with max. pull of 500 t (and 650 t static brake). The bollard pull of ships with main propulsion of 23 500 BHP is in the region of 260-270 T.
After their previous deployment the three L-type AHTS vessels arrived to "Remontowa" from Aberdeen during September. All came for some 250 tons of steel addition each. Each of the trio leaves Gdansk - based yard upgraded and modernized, however the extend and specification of modifications slightly differs from one ship to another. 



The vessels have received new working deck coverage - sandwich decks composed of 50 mm thick wood planking with steel sheet layer of 30 mm thickness on top. Two ballast tanks have been converted to fresh water tanks on each vessel. The three ships have also received stern installed A-frames to facilitate heavy anchor handling. Two fuel tanks are converted to chain lockers (according to Petrobras' requirements the ships have to feature four chain lockers each instead of two, usually seen on such vessels). Fresh water tanks have been repainted, and their walls changed color on this occasion - from grey to white. Some crew cabins on each of the three vessels are converted to office spaces. Not mentioning numerous minor repairs, the ships have also undergone steelworks as well as maintenance works, the latter being subcontracted to Muehlhan, including docking and painting of the whole hulls, with surface preparation according to Hempel standards. Internally, four freshwater tanks and two ballast tanks were sandblasted to achieve SA 2,5 surface smoothness class.
These are the major works performed on all three vessels. Furthermore, two of the trio, namely Leader and Launcher, have had additional - anchor 170 T pull handling winch installed at "Remontowa" (Lancer had already had two winches before). One of the Maersk Launcher's main engines was dismantled and taken ashore and its cracked main block repaired, while the crank shaft has been sent to service station.


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