ISO Grade Oil

Overview

Engineering reference data for ISO Grade Oil 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	—

ISO Grade Oil Properties

The table below provides viscosity and density data for standard ISO grade hydraulic and lubricating oils. Viscosity is given in both centiStokes (cSt) and Reyns units, while density is provided in SI and imperial units.

Unit Conversions

The viscosity values use two common unit systems:

• CentiStokes (cSt): Kinematic viscosity in SI units, where $1 \text{ cSt} = 10^{-6} \text{ m}^2/\text{s}$
• Reyns: Dynamic viscosity in imperial units, where $1 \text{ reyn} = 6894.76 \text{ Pa·s}$

The relationship between kinematic and dynamic viscosity is:

$\mu = \nu \cdot \rho$

where $\mu$ is dynamic viscosity (Pa·s), $\nu$ is kinematic viscosity (m²/s), and $\rho$ is fluid density (kg/m³).

Interactive Charts

References

• Original Source