GL supervises LNG fuel conversion
Bit Viking, the world’s first vessel converted to run on LNG, is back in service following successful sea trials under GL supervision.
G
ermanischer Lloyd (GL) has recently participated in a major project involving Tarbit Shipping’s
tanker Bit Viking, whose existing oil-burning engine was converted into a dual-fuel one that can burn either fuel oil or gas. Te project has put GL to the forefront of the development of LNG-fuel retrofits, and its experience is likely to be harnessed for future projects of this type. Ronnie-Torsten Westerman, business
development manager at GL says: “The project started with an initial meeting of representatives from Wärtsilä, Tarbit Shipping, and GL in April 2010. Because of our broad LNG expertise, GL was chosen for the classification part of the conversion.” Manufacturing of various new components
began in early 2011 and these components were then transported to the shipyard in Landskrona, Sweden. Bit Viking arrived at the yard on time and the conversion commenced in August. Westerman says: “GL staff played a critical role in this process, monitoring the manufacture and installation of the components, such as piping, valves, safety equipment and LNG tanks. Tey were able to ensure safe construction, use of suitable materials and application of appropriate welding methods.” Te two main engines were converted from
Wärtsilä VASA type 46 D to type 50 DF and virtually everything was replaced except the crankshaſts and frames. Naturally the engine manufacturer was a key partner in the project and the scope of the conversion package from Wärtsilä included deck-mounted gas fuel systems, piping, related control systems and all adjustments to the ship’s systems necessitated by the conversion. Te engines are connected directly to the propeller shaſts through a reduction gearbox, thus avoiding the electrical losses that are a feature of diesel-electric configurations. Tis enables a significant improvement in propulsion efficiency, reduced fuel consumption, and corresponding reductions in emissions. Bit Viking also utilises Wärtsilä’s new
LNGPac system, designed to enable the safe and convenient onboard storage of LNG. Te
Bit Viking, converted to LNG fuel under the supervision of GL, on sea trials. (Courtesy Tarbit Shipping)
GL monitored the installation of various components onboard. two 500m3 LNG storage tanks are mounted
on the deck to facilitate bunkering operations and permit the bunkering of LNG at a rate of 430m3
per hour. Te storage tanks provide
the vessel with 12 days of autonomous operation at 80% load, with the option to switch to marine gas oil if an extended range is required.
Shiprepair and Conversion Technology 1st Quarter 2012 After the shipyard works Bit Viking
was taken to Risavika near Stavanger for completion of the pipe installation, and testing and calibration of the newly installed equipment. Te vessel was then ready for its first bunkering of LNG. “Te first time we prepared for bunkering we had to cool down the LNG storage
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