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SFOC Definition and Calculation Guide

This document discusses the definition, formula, and calculation of specific fuel oil consumption (SFOC) for diesel engines. It defines SFOC as the mass of fuel consumed per unit of power output. It provides the formula for calculating SFOC using values like fuel consumption over a period, fuel density, measuring period, and brake horsepower. An example calculation is included to demonstrate how to use the formula. Comments from readers ask about density values and how to calculate SFOC for other applications like boilers.

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100% found this document useful (2 votes)
11K views3 pages

SFOC Definition and Calculation Guide

This document discusses the definition, formula, and calculation of specific fuel oil consumption (SFOC) for diesel engines. It defines SFOC as the mass of fuel consumed per unit of power output. It provides the formula for calculating SFOC using values like fuel consumption over a period, fuel density, measuring period, and brake horsepower. An example calculation is included to demonstrate how to use the formula. Comments from readers ask about density values and how to calculate SFOC for other applications like boilers.

Uploaded by

Him Sati
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Specific Fuel Oil Consumption (SFOC) Definition,Formula And


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Specific Fuel Oil Consumption Definition

Consumption of fuel oil per unit energy at out put shaft is known as Specific fuel oil
consumption.Unit of specific fuel oil consumption is Kg/kWh or g/bhph .Or we can define in
another way ie, mass of fuel oil consumed per average shaft power developed by the engine
at the same time
Specific fuel oil consumption= Mass of fuel consumed per hour/break power in
that particular hour

Detailed Specific Fuel Oil Consumption calculation for diesel engine SFOC
Calculation

SFOC = ( Co x D x 10^6 )/(h x Pe)

where:
Co = Fuel oil consumption over the period (m^3)
D = Corrected gravity (t/m3)
h = Measuring period, hours
Pe =Brake horse power, bhp

Specific Fuel Oil Consumption Calculation

For finding Specific fuel oil consumption we should know all the values which is required
for the above formula

>Take fuel oil flow meter reading for specific time interval usually take one hour period.
ie h=1hr
>Difference between two reading gives you the Volume ie Co
>Density of fuel oil is in bunker delivery note or in sample test result using this value
Please Donate A Like
calculate the density of fuel oil at the temperature near the low meter D
Temperature corrected Density D= (Density of Fuel Oil @ 15 degree Celsius) * [1- {(T-15)
Marinesite
* 0.00064}] 3,156 likes
>Calculate the shaft power at the given interval Pe . Shaft power is calculated by the
help of dynamometer or using fuel index and RPM you can find out the break power from
the graph given in manual.

For example
h =1hr
Co =1.3m3
D119 =0.94t/m3
Pe =8,200 bhp

SFOC = ( Co x D x 10^6 )/(h x Pe)


Latest Comments
=149.03g/bhph

1 of 3 16-10-2017, 00:13
Specific Fuel Oil Consumption (SFOC) Definition,Formula And Calcula... http://www.marinesite.info/2014/03/specific-fuel-oil-consumption.html

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correct ans 1 is C
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Bijoy chandrasekhar
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bhanu jaswal 4 December 2016 at 15:42 Happy to know it helps you.. visit
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what is generally the density of hfo and diesel oil at 15 c
Bijay Kumar Singh commented:
Reply Very useful

Replies
Ermie Tupaz commented:
that is given by your laboratory
Bijoy chandrasekhar 3 January 2017 at 20:42
(BDN).
density for hfo is aroung 0.99 @ 15 C and Do is .8 aprox.
Popeye commented:
Where to find the required
equipment in a SOPEP container? ...
Ermie Tupaz 5 October 2017 at 10:16
Unknown commented:
that is given by your laboratory (BDN). Well...your blog is useful for orals
preparation

Reply

Anonymous 24 March 2017 at 00:07


How to find Specific Lube Oil Consumption plz anybody Share it with me
abubakar0yousaf@gmail.com
Reply

Anonymous 23 May 2017 at 18:52


how to get SPFOC in g/kWh of boiler consumption with power rating of 31KW and fuel consumption of
385kg/h .
Reply

Jade Graham 2 August 2017 at 22:30


A look at Kwantas Assets consist mostly Palm Oil Plantations & some Palm Oil Mills in Guanchow, China.
risk of investing in oil
Reply

kevin rex 31 August 2017 at 00:00


Mass correction also has to be added to this,even the calorific value has to be accounted
Reply

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