Turbocharger cut-off system benefits engine performance

To meet the 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.  

MAN Diesel's Turbocharger cut-out system lowers main-engine fuel-oil consumption and improves performance during low-load operation. The system includes two pneumatically-operated cut-out valves placed at the turbine inlet and compressor outlet.

Installation of the Turbocharger cut-out system requires little time and MAN Diesel PrimeServ said that with the right planning, off-hire can be avoided.

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

• an expected SFOC reduction of 5g/kWh and a 0.25 bar increase in scavenge-air pressure at 25 percent power,
• an expected SFOC reduction of 3g/kWh and a 0.52 bar increase in scavenge air pressure at 50 percent 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 percent to 74 percent MCR, delivering:

• an SFOC reduction of 6g/kWh per 0.15 bar increase in scavenge-air pressure at 25 percent power,
• an SFOC reduction of 5g/kWh per 0.41 bar increase in scavenge-air pressure at 50 percent 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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