M/V “DP Eagle”

Superstructure repair


DP Eagle

The ship was built in Norway in 1975. She was the first ship in maritime history that the satellite navigation system of “DP positioning” was installed on. She is the universal vessel that can provide the service of tugboat as well. One of the repair tasks was the prefabrication and installation of a new deckhouse and a new wheelhouse.

The ship was built in Norway in 1975. She was the first ship in maritime history that the satellite navigation system of “DP positioning” was installed on. She is the universal vessel that can provide the service of tugboat as well. The vessel is equipped in two radars, two gyrocompass units, echo sounder and autopilot unit, as well as satellite communication system. In addition she is also equipped with the unit of precise positioning of the vessel. The ship has following cranes installed: one of 14 ton lift capacity at 9m beam (10 tons at 15 m beam), one electro-hydraulic of “Hydrolift” type of 2,5 tons lift capacity at 10m beam, and one powered by combustion engine/electricity with the vertical hoist of 200m. At the bottom of the ship the moon pool with hydraulic operated covers is installed. At the bow section there is a gantry crane of 40-ton nominal lift capacity.

In 1999 she underwent repairs in SHIPREPAIR YARD “NAUTA” S.A., in Gdynia.

The main dimensions:
Length o.a. 63,61 m
Length b.p. 55,93 m
Breadth moulded 13,40 m
Height to the shelter-deck 6,65 m
Drought summer 5,75 m
Speed max. 12 knots

One of the repair tasks was the prefabrication and installation of a new deckhouse and a new wheelhouse. Both constructions were made in the workshops in inverted positions, as they were the bulky sections. The bridge was fabricated as one section only, however the deckhouse had to be made as two separate blocks for heavy weight reasons. After the decks were laid and the walls installed, and welding works done, the bulky sections following the technology process had to be additionally strengthened. The high lifting / transportation holders with anti-swivel brackets were installed on decks. Next, the block sections were turned upside-down to allow completion of welding of decks and of the deckhouse walls. At the same time, dismantling works of the existing wheelhouse and the cofferdam were in progress, as well as the works of lengthening the deck on which a new deckhouse was to be placed. Thereafter, both block sections of a new deckhouse were transported and precisely fitted against each other, and then they were finally assembled.
Next, the wheelhouse was transported on board and laid down on top of the deckhouse, in accordance with the technical drawings.

During the repair works, a gantry crane was equipped with new hydraulic actuator cylinders and thereafter the tests were carried out, for nominal 40 ton lift, and later tests for 1,5 times heavier than nominal lift (60 ton). A tank full of water was hooked as the weight. After it was filled with 40 tonnes of water the tests were carried out for three fixed positions of the gantry crane: the first at a maximum deflection to the stern, the second at an intermediate deflection and the third at a maximum deflection to the bow. For each of these tests, a gantry crane was locked at its position for 10 minutes. Following the same pattern, the tests of this crane were carried again with the weight increased up to 60 tonnes.

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