Viscosity Fuel Oils

Reference data and engineering information about viscosity fuel oils for combustion applications.

viscosityfueloilsData Table

Overview

Engineering reference data for Viscosity Fuel Oils in combustion engineering.

Key Formulas

Heat Release

$Q = \dot{m} \cdot HV$

Fuel energy release rate.

Air-Fuel Ratio

$AF = \frac{m_{air}}{m_{fuel}}$

Mass of air per mass of fuel.

Excess Air

$EA = \frac{O_2}{21 - O_2} \times 100\%$

From flue gas oxygen measurement.

Variables

Symbol	Description	Unit
$Q$	Heat release rate	W
$\dot{m}$	Mass flow rate	kg/s
$HV$	Heating value	J/kg
$AF$	Air-fuel ratio	—

Viscosity Conversion Formulas

The conversion between Saybolt Universal Seconds (SSU) and kinematic viscosity in centiStokes (cSt) is approximately:

$SSU = cSt \times 4.55$

Note: This equation is accurate only within a specific viscosity range. For precise conversions, refer to ASTM D2161 "Standard Practice for Conversion of Kinematic Viscosity to Saybolt Universal Viscosity or to Saybolt Furol Viscosity".

Temperature conversion from Celsius to Fahrenheit is given by:

$T_F = T_C \times \frac{9}{5} + 32$

Practical Viscosity Ranges for Fuel Oils

Pumping Limit: 4 - 5000 SSU is the maximum practical range.
Atomization Range for Fuel Oil No. 5 and 6: 150 - 300 SSU.

References

Original Source

Source: engineeringtoolbox.com