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July 21, 2009

MAN Diesel offers turbocharger cut out system

To meet the growing demand for running large container vessels on varying loads, MAN Diesel has developed a turbocharger cut out system that improves main engine performance during low load operation.

The system lowers main engine fuel oil consumption and improves performance during low load operation. It includes two, pneumatically operated cut out valves placed at the turbine inlet and compressor outlet.

MAN Diesel PrimeServ says installation of the Turbocharger Cut-out system requires little time and that with the right planning, off-hire can be avoided. Installation during voyages can be carried out by a MAN PrimeServ installation team.

On engines with three turbochargers, one turbocharger cut-out enables operation at loads from 20% to 66% MCR, delivering:

    an expected SFOC reduction of 5 g/kWh and a 0.25 bar increase in scavenge-air pressure at 25% power

    an expected SFOC reduction of 3 g/kWh and a 0.52 bar increase in scavenge air pressure at 50% power

    turbine-out temperature drops of up to 30 degrees.

Engines with four turbochargers and one turbocharger cut-out enables operation at loads from 20% to 74% MCR, delivering:

    an SFOC reduction of 6 g/kWh per 0.15 bar increase in scavenge-air pressure at 25% power

    an SFOC reduction of 5 g/kWh per 0.41 bar increase in scavenge-air pressure at 50% power

    turbine-out temperature drop of up to 50 degrees

For engines with less than three turbochargers, MAN Diesel PrimeServ recommends a solution with variable turbine inlets.


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