What is SFOC? How to calculate SFOC?

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

  1. Brake SFOC – calculated with brake power
  2. 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.

About the author

Anand Gautam

Anand Gautam is a marine engineer, Graduated from M.E.R.I. Mumbai. He likes to sail onboard ship and is one who is passionate about his job. He loves to share his knowledge, information, and ideas to everyone in a simplified way just for his satisfaction.

Leave a Comment