A well tuned and balanced engine is an important part of efficienct vessel operation. Having a (well functioning!) torsionmeter together with good accuracy fuel consumpiton measurements is one of the options for monitorin (daily) engine efficiency through the Specific Fuel Oil Consumption (SFOC). In addition, many operators use monthly (dedicated) performance tests of the main (and auxiliary) engine(s) in order to get detailed measurements on compression and combustion pressures, as well as engine balance.
As part of our service, VP Solutions has a report for monitoring the daily SFOC of the main engine. Combined with e.g. a service form TEKOMAR we can help monitor the efficiency of the main engine.
The basic principle behind monitoring the engine efficiency is to use the result from the Shop Test, from when the Engine (and vessel) was delivered. The Shop Test contains a (verified) load dependent SFOC curve which acts as a baseline for the results obtained onboard. On the daily measurements it is normally not possible to make ISO corrections of the measurements, similar to the Shop Test. However, it is still possible to look at the trending of the SFOC, in order to indeltify whether the SFOC is stable. And if the Lower Calofiric Value (LCV) is available, this can be done with reasonable accuracy. The dedicated performance tests can act to inivestigate the trends detected by the daily measurements, and to get a deeper insight into the engine performance and how to adjust.