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Project 1274 Klasma class (cable ships)

The rapid development of the Northern and Far Eastern regions required the creation of a large BSC (BSC) for the development of a system of long submarine communication lines. This KBS was designed at the end of the 50s at the Vyartsilya shipyard in accordance with the technical specifications of the USSR Navy and under the supervision of its specialists. The head BKBS was built in 1962 and received the name "Ingul". In total, up to 8 BCBSs were built at this shipyard until 1978. Moreover, the last three had an increased carrying capacity of already 2,800 tons of cable and a slightly larger displacement.

The ship's carrying capacity was determined at 2,400 tons of cable and 270 tons of other cable equipment. The total displacement of BKBS reached 6,810 tons. The BKBS was equipped with two bow 20-ton winches and two mobile winches. The BKBS equipment allowed working at depths up to 2,500 m. The main two-shaft power plant, diesel-electric, provided a speed of more than 15 knots.

The cable vessels of project 1274 were built at the WARTSILA shipyard (Turku, Finland). With a displacement of 7030 tons, the ships were built from Siemens - Open-hearth steel. The vessel was designed for laying, lifting and repairing underwater cable systems with rigid amplifiers and couplings at depths up to 2500 meters. The vessels were initially equipped with two propellers, a bow thruster and an active steering wheel. The fuel supply was sufficient for a range of 3,000 nautical miles when traveling at a speed of 14 knots with full power of the main engines, sufficient power of the auxiliary engines and with a working heating system. Autonomy of swimming in fuel and water reserves for 30 days.

The source of energy for powering the propeller motors is 5 diesels, with a capacity of 990 hp. of which each is connected to a 680 kW DC generator. Rowing 2-screw, with a total capacity of 4300 hp. To ensure maneuvering, the vessel has a bow thruster of 800 hp in the bow. The active steering wheel is driven by an AC motor mounted on the steering wheel. The deadweight of the vessel is 3261 tons with draft on the cargo water line in salt water with a specific gravity of 1.025 tons.

The vessel is separated by watertight bulkheads. In the middle part of the vessel there are 3 cylindrical tenks for placing a cable system with a total capacity of 2500 tons, which allows placing up to 1500 - 2000 km of cable (depending on the type of cable and system configuration). The vessel is equipped with storage space for underwater amplifiers up to 50 units, depending on the overall dimensions of specific products. This amount is sufficient for laying systems up to 2,000 km long.

Cable vessels are capable of performing tasks in a wide range of climatic and physical-geographical conditions in all seas, including in the Arctic, independently in ice conditions with an ice thickness of up to 0.4 m, or with icebreaker piloting without restriction.

The company "ArcticKabel", is the owner of a specialized cable vessel pr.1274 "Tsna". Currently, the Company carriest repair and restoration work of the ship and takes measures to modernize it in order to bring the characteristics to the operational and technical level that meets modern requirements ensuring competitiveness and steady demand in the market.