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SHIPPING: Ark takes delivery of OSD-designed AHTS for Caspian ops

04 October, 2017

A new shallow-draft anchor-handling tug supply (AHTS) vessel designed by Offshore Ship Designers (OSD) has been delivered to Russian inland waterways operator and offshore logistics service provider, Ark Shipping.


The AHTS Antarctic, designed in close co-operation with the owner, is partly based on the design of another OSD-designed ship, the Arctic, which was delivered to Ark Shipping in 2012. The DP1 vessel has a Bureau Veritas Ice Class Notation, and is fully equipped to operate in the challenging and extreme conditions of the Caspian Sea, where ice formation of around 80 cm during the winter period is not exceptional. Construction of the hull from special-grade steel will enable the Antarctic to endure minimum temperatures of -25 to -30C. Hull construction, meanwhile, has been optimized to create a relatively low-weight hull for an ice-class 1A vessel.

The Antarctic’s large breadth forms a stable platform for stand-by rescue, supply and anchor-handling operations under extreme conditions. The vessel can supply and load different cargoes such as cement, liquid mud, fuel oil, fresh water and black water. The minimum draft in a light operating condition of approximately 2.5m facilitates access to the shallower parts of the Caspian Sea.

The Antarctic has a Standby Rescue Vessel class notation for 100 survivors. An innovative accommodation design offers sufficient room for survivors and ensures proper sanitary facilities. The vessel, which is fully equipped with all equipment needed to ensure safe and efficient anchor-handling operations, has a total propulsion power of 4923 kW and 6600 hp. It has six rudders with a triple steering gear and double-cylinder set-up. Three Cummins QSK60 Engines drive three high-thrust propellers. a configuration which ensures a high bollard pull and excellent manoeuvrability, even in icy and shallow waters.

“Ark Shipping has been operating vessels in the Caspian Sea for almost 30 years, establishing a reputation for excellence and innovation,” said OSD managing director Michiel Wijsmuller.

“It must meet the requirements of the major oil and gas companies in the area, so it is always looking to push the boundaries of orthodox technology to provide high-quality vessels which operate in an efficient and safe manner in difficult environments. We are delighted that Ark returned to OSD for its latest vessel, which adds to our continually expanding design portfolio.”

Offshore Ship Designers specialises in newbuild design and basic engineering for a wide range of ship types, including tugs, workboats and vessels for the offshore, renewable energy, passenger transport, fishing and general cargo markets. Strategically located in Europe and Asia, its experienced teams provide a full range of consultancy, naval architecture and marine engineering services, including concept FEED studies, vessel refit and conversion, and structural and stability investigations.