IJMUIDEN, the Netherlands– Offshore Ship Designers (OSD) has presented a new series of Ice Class vessel designs, especially suited for marine services around the development of new arctic ports, terminals, and offshore structures.
A prerequisite for this type of vessel, operating under arctic conditions, is the ability to deal with the presence of first-year or floating ice, cold conditions, and less developed shore facilities. Apart from the ability of the vessels to perform their specific tasks, typical design requirements are increased strength, special installations for tank heating and winterization, high manoeuvrability, and limited draft.
The company said that the development of this series follows the experience it has gained with the development of theshallow-draft anchor-handling tug supply vesselsArcticand Antarcticfor Ark Shipping.
According to OSD, theArctic and Antarctic were designed in close cooperation with the owner, have a Bureau Veritas 1A Ice Class Notation, and are fully equipped to operate in the challenging and extreme conditions of the Caspian Sea, where ice formation of around 80 cm (32 in.) during the winter period is not exceptional.
Herm Jan de Vries, technical manager at OSD, said: “… the new OSD Ice Class series is a response to identified market needs, covering a variety of tasks, such as supply of bulk and break cargo, towing, anchor handling, ice management, personnel transfer, environmental clean-up and safety/stand-by duties.
“In order to meet these diverse roles, the propulsion plant of the vessels can be adapted to suit the operational profile. Options include installation of controllable-pitch or fixed-pitch propellers, with or without nozzle, driven by a diesel direct, hybrid or full diesel electric power plant. The use of podded propellers is also possible. In this way, optimal performance can be achieved in various conditions such as maximum bollard pull, higher speed transfer duties, slow-speed duties for ice management or stand-by duties.”
The designs are available, as standard, in three different lengths at 50 m (164 ft), 65 m (213 ft) and 80 m (262 ft), and have a bollard pull ranging from 45 up to 70 metric tons.
Herm Jan de Vries added: “Due to the limited length and cargo capacities, the smaller design is best suited for towing and pushing, ice management and anchor handling duties. The middle design brings the best of both worlds, while the larger design is typically aimed at the supply function, having a large deck area and ample tank space below deck. However, it can also perform light construction and safety standby duties.”