Step change for container ship propulsion

27 Jul 2012
The first S90ME-C9.2, a 12-cylinder version, has completed trials

The first S90ME-C9.2, a 12-cylinder version, has completed trials

MAN Diesel & Turbo has announced that its first super-long-stroke, 90-cm bore Mk 9 engine has successfully completed test bed trials at licensee Hyundai Heavy Industries Engine & Machinery Division in Korea.

The company says that its S90ME-C9.2 covers the new trend in container shipping demanding smaller bore, super-long-stroke engines with lower propeller speeds. Physically the largest two-stroke engine designed by MAN Diesel & Turbo, the 12-cylinder engine will deliver a torque of 8.5 million Nm at 84rpm and has a total output of 69,720kW.

The engine, built by Hyundai Heavy Industries, will be installed on a container vessel built at Samsung Heavy Industries for Hong Kong-based Orient Overseas Container Line.

Since the beginning of the global economical crisis in late 2008, MAN Diesel & Turbo has seen demands from shipowners for reduced operating costs and slow steaming, which MAN has met through measures like low-load optimisation of engines and operation with turbocharger cut-out. These trends led the company to offer possibilities supporting optimised propulsion efficiency by way of lower propeller speeds by using longer-stroke engine designs. This, in combination with the need to meet EEDI standards, led to the development of the super-long-stroke S90ME-C9.2. Developed specifically for container ships, the S90ME-C9.2 is based on the VLCC-optimised S90ME-C8, which in the meantime also found applications in a number of container ships.

Following the same trend, the G series of engines with even larger stroke to bore ratios has been made available, with G40, G45, G50, G60, G70, and G80 type engines supporting the tendency of using lower propeller speeds with a super-long stroke for all ocean-going ship types.

In addition to the basic optimisation of the propulsion plant for container ship operation, by using the low propeller speed supported by the S90ME-C9.2 engine, the engine is delivered with the following three different MCR optimisations:

  1. High-rated MCR with part load optimisation;
  2. De-rated MCR optimisation with part-load tuning;
  3. De-rated MCR optimisation with low-load tuning.

According to MAN, the rebuilding and parameter set-up changes necessary for switching between particularly MCR points 2 and 3, and thereby ensuring optimum operation conditions for relevant trade patterns, are minimal.

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