Rocks & mirror
Encyclopedia of Marine and Energy Technology

Cable layer SEGERO


According to the Maritime Reporter December 1998

The SEGERO was built in 1998 by Hanjin Heavy Industries Co. for Korea Submarine Telecom. The ship was designed to carry out the laying, burying and repair of intercontinental submarine fiber-optical cable, with particular reference to the severe weather conditions and extremely low temperatures. The design follows the fully stern-working concept which permits to continue work even in the worst weather conditions and by allowing a conventional bowform to be adopted, providing a high cruising speed.

The ship has two main cable tanks of total capacity 2050m3 (3900 tonnes) and two 80m3 cable tanks. Most cable work is concentrated on the continuous, mainly closed, upper deck, using two 3.6m diameter stern sheaves straddled by a 35-ton safe working load (SWL) A-frame. This can work in an arc ranging from 80 degrees over stern to 80 degrees inboard up to the sea state 5, and provides for launching and recovering a cableplough from either of the two cable lines. One 20-ton SWL telescopic crane and one 8-ton articulated crane are also fitted aft. The starboard and port cable line consists of a Dowty 4m diameter/40tonne-pull cable drum engine and a 4tonnne/four-wheel-pair draw-off/hold-back engine on each side.

The diesel-electric power system is based on four ABB generators, two of 3400 kVA, one of 2300 kVA and one of 850 kVA. Electric power is distributed through two main switchboards, with four transformers, supplying two 2700kW ABB propulsion motors, which drive two azimuth propulsion units. The propellers are fitted with steerable nozzles to help to prevent cable fouling. Additional manoeuvrability is provided via a pair of Wärtsilä-Lips 1200kW tunnel thrusters and a 1500kW White Gill vectoring unit operating forward.

The vessel is provided with a Konsberg Simrad integrated monitoring and control system (IMCS), which consists of dynamic positioning system, thruster control system and vessel control system. The dynamic positioning system incorporates special sensors, functions and operational modes which are related to the cable laying and trenching applications. The thruster control system incorporates lever control of each thruster, as well as an independent joystick system with common control of all selected thrusters. The vessel control system incorporates alarm monitoring and control system, including power management functions. The ship is also equipped with the STN Atlas total navigation system, including radar, Doppler sonar, echo sounder as well as JRC GMDSS. To provide more comfortable working and living conditions for the ship complement of 63, a longer rolling period has been achieved using sufficiently large and long bilge keels, and the anti-roll tanks.

Length, oa: 115.4m, Length, bp: 95.6m, Breadth, mld: 20m, Deadweight design/scantling: 3706/6409dwt, Draught design/scantling: 6.3/7.8m Service speed: 16.6 knots at 100% MCR, Water ballast: 1848m3, Fuel consumption: 34.3 ton/day (main engine).