Specific fuel oil consumption (SFOC) can be defined as fuel consumption in grams for unit power developed in unit time.
Unit: Grams/kilo watt hour
What is Brake SFOC and Indicated SFOC ?
SFOC can be
- Brake SFOC – calculated with brake power
- Indicated SFOC- calculated with indicated power
In order to achieve accuracy, the fuel consumption and power developed is always measured over a suitable time period on a good weather. The formula used for calculating SFOC is:
SFOC (g/kwh) = Mass of fuel consumed per hour / Power developed in KW
Where Mass of fuel = Specific gravity at current temperature (after applying density correction factor to specific gravity of oil at 15 degree Celsius obtained from BDN) x Volume of oil consumed per hour.
The engine power can be calculated from the Indicator diagram or from Fuel Pump Index method or from Turbocharger speed.