Name Balder Completed 1978 Weight 104,400 tons | Length 154 m Displacement 104.4 million kg | |
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Builder Mitsui Engineering & Shipbuildingconversion to a DCV by Verolme Botlek | ||
Dcv balder undocking
DCV Balder is a Deepwater Construction Vessel (DCV) operated by Heerema Marine Contractors.
Contents
On site machining of winch drum dcv balder
History
The Balder was constructed in 1978 as semi-submersible crane vessel by Mitsui Engineering & Shipbuilding Co., Ltd.. Balder and sister vessel, Hermod were the world's first semi-submersible crane vessels. In the early 1980s these vessels set several lift records while operating in the North Sea. Conversion to a DCV was carried out in 2001 by Verolme Botlek BV in the Netherlands.
Design
The hull consists of two floaters with three columns each. The transit draught of 12 meters is normally ballasted down to 25 meters for lifting operations, with the floaters (with a draught of 12 meters) are well-submerged, reducing the effect of waves and swell.
It is powered by seven 3,500 kW azimuth thrusters and two propellers. There is accommodation for 350 persons. Lightship weight is 49,631 tonnes.
In the 2001 conversion, it was fitted with seven thrusters and a J-lay system. The 98 m J-Lay tower, designed and constructed by Huisman Itrec, is capable of laying pipe in water depths to 3,000 m (10,000 ft). Balder was also equipped with class III Dynamic Positioning system and a Mooring Line Deployment winch. The winch is the largest in the world, with a diameter of 10.5 meters and a Safe Working Load (SWL) of 275 t.
Cranes
The Balder has two cranes (3600 t, 2700 t). Originally the starboard-side crane was rated at 3000 short ton and the port-side at 2000 short ton. In 1984, the lifting capacities were upgraded to 4000 and 3000 short tons respectively in a fixed mode (and 3300 & 2200 in revolving mode). To accommodate the J-Lay tower, the port crane jib was converted to a fly jib in 2001.
Remarkable projects
