The history of the SA-15 class cargo ships dates back to the late 1970s when the leading Finnish shipbuilders Wärtsilä and Valmet both developed designs that met the requirements set by the Ministry of the Merchant Marine of the Soviet Union (MORFLOT) for the new class of arctic cargo ships capable of year-round operation in the Northern Sea Route.
[4][10] After the initial series Valmet received another follow-up order for five ships of slightly different design, sometimes referred to as the SA-15 Super class due to the minor improvements based on the operators' experiences in the arctic.
[11] The first SA-15 class ship from Valmet, Nizhneyansk, was delivered from the Vuosaari shipyard in Helsinki on 21 January 1983, about three months ahead of the contracted delivery time.
[1] As the winter of 1983 was particularly difficult, Nizhneyansk was sent to the Northern Sea Route to unload cargo from icebound ships and deliver the much-needed supplies to isolated communities along the coast.
79 Russian scientists and 11 crew members were airlifted by helicopters to the South African research ship S. A. Agulhas and returned to Cape Town.
[15] Captain Kurbatskiy was offered for sale in August 2011 for US$7 million, which was slightly higher than the current demolition prices for such vessel in India.
[10] The shallow waters of the Northern Sea Route limited the draught to 9 metres (29.53 ft), but outside the arctic the cargo capacity of the ship could be increased by allowing the ice-strengthened parts of the hull to become submerged.
Propulsion power was provided by two 14-cylinder Wärtsilä-Sulzer 14ZV40/48 4-stroke medium-speed diesel engines running on heavy fuel oil, each with a maximum continuous output of 7,700 kW (10,326 hp) at 560 rpm.
The main engines were connected to a single propeller shaft through a double input/single output single-stage reduction gear equipped with separate multi disc clutches and Voith fluid couplings.
[19] The fully locking mechanical clutches were used to improve fuel efficiency when the ship was operating in open water or light ice conditions.
On the continuous tweendeck the ship could also carry roll-on/roll-off cargo which was loaded and unloaded via a stern quarter ramp that could also be lowered directly on ice.