JUNE 28, 2013 — MAN Diesel & Turbo is to supply of 8L32/44CR B.2 engines as part of a complete propulsion package to power the Ice Class 1A* seismic vessel recently ordered by GC Rieber Shipping of Norway at Kleven Werft (see earlier story). The contract contains an option for a second vessel.

Four of the engines, along with two two-speed Flender twin-in/single-out reduction gears and MAN Alpha twin screw CP propellers in AHT nozzles, will power the vessel. The seismic vessel is graded as Ice Class 1A*, which provides a good basis for operating in Arctic areas.

The vessel design is an ST 324 XT from Skipsteknisk of Aalesund, Norway. Its hull will be constructed in Poland with outfitting subsequently carried out at Kleven's Myklebust shipyard, north of Aalesund.

The propulsion plant is scheduled for delivery by May 2014 with vessel delivery following in March 2015.

Expertise in ice has long been a GC Rieber Shipping trademark with an emphasis on delivering customer solutions for demanding operations in sensitive environments where quality, safety and environmental concerns are crucial. These tough requirements also apply to the propulsion plant and the shipyard's previous, positive experience with MAN Diesel & Turbo engines was decisive in finalising the propulsion package.

Propulsion package

The four-stroke 8L32/44CR B.2 common-rail engines, delivering 600 kW/cylinder, will be constructed and tested in Augsburg, Germany – headquarters of MAN Diesel & Turbo. The common-rail B.2 engine is one of the most advanced in the company’s product portfolio, has a second-to-none SFOC, and has gained a solid foothold in the offshore business.

The reduction gears from Siemens-Flender are specially designed such that – at constant engine speed (750 rpm) – two different propeller speeds can be selected (155 rpm or 120 rpm), allowing the propellers to have a much wider silent-operation window. The TI/SO gears are also provided with two 2,600 kWe PTOs each.

The MAN Alpha VBS1100 Mk5 CP propellers have up to six operating modes, delivering the flexible propeller-output speed needed to operate at the optimum efficiency in all modes. Suppressing cavitation on the propellers is an important design criterion since, especially on the pressure side, the noise deriving from cavitation can disturb seismic sonar readings.

The ø4200 CP propellers operate in Alpha High Thrust (AHT) nozzles, which further help to increase propeller performance by offering higher thrust at low vessel speed, and reduce cavitation noise through selection of the optimum nozzle L/D ratio.