More LNG Carriers employing MAN engines
MAN Diesel & Turbo has won the contract to supply the engines for six Chinese LNG carriers (LNGCs). The order for the 30 × MAN 51/60DF dual-fuel engines is a significant development for both Chinese shipyards as well as the LNGC market.
The configuration for the new order covers 5 × 8L51/60DF engines, all of the engines are IMO Tier II-compliant in diesel mode and will have lower exhaust-gas emissions in gas mode than IMO Tier III stipulates – fuel-sharing mode will be applied to each unit.
Each newbuilding will have a payload of 174,000 m and be DFDE (dual-fuel diesel electrical)-driven, providing the customer with the optimum redundancy. The vessels will be the first large LNG carriers with a DFDE configuration built in China.
Fuel Sharing Mode (FSM) describes the operation of a dual-fuel engine with a mixture of fuel gas (NG, NBOG) and fuel oil (MGO, MDO or HFO) at a certain ratio. All cylinders operate at the same fuel-sharing ratio simultaneously.
Adopting FSM brings several advantages, including:
- full load with low quality of fuel gas (LHV, MN)
- full load with low quantity of fuel gas
- full load with high ambient air temperature
- retrofit ‘DF-light’ (gas mode without pilot fuel system)
