ISO Grade Oil
Reference data and engineering information about iso grade oil for combustion applications.
isogradeoil
Overview
Engineering reference data for ISO Grade Oil in combustion engineering.
Key Formulas
Heat Release
Fuel energy release rate.
Air-Fuel Ratio
Mass of air per mass of fuel.
Excess Air
From flue gas oxygen measurement.
Variables
| Symbol | Description | Unit |
|---|---|---|
| Heat release rate | W | |
| Mass flow rate | kg/s | |
| Heating value | J/kg | |
| 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.
6 rows
ISO Grade | Equivalent SAE Grade | Viscosity at 40°C(cSt) | Viscosity at 100°C(cSt) | Viscosity at 104°F(10⁻⁶ reyn) | Viscosity at 212°F(10⁻⁶ reyn) | Density(kg/m³) | Density(lb/in³) |
|---|---|---|---|---|---|---|---|
| 32 | 10W | 32 | 5.4 | 4 | 0.6 | 857 | 0.031 |
| 46 | 20 | 46 | 6.8 | 5.7 | 0.8 | 861 | 0.0311 |
| 68 | 20W | 68 | 8.7 | 8.5 | 1.1 | 865 | 0.0313 |
| 100 | 30 | 100 | 11.4 | 12.6 | 1.4 | 869 | 0.0314 |
| 150 | 40 | 150 | 15 | 19 | 1.8 | 872 | 0.0315 |
| 220 | 50 | 220 | 19.4 | 27.7 | 2.4 | 875 | 0.0316 |
Source: engineeringtoolbox.com
Unit Conversions
The viscosity values use two common unit systems:
- CentiStokes (cSt): Kinematic viscosity in SI units, where
- Reyns: Dynamic viscosity in imperial units, where
The relationship between kinematic and dynamic viscosity is:
where is dynamic viscosity (Pa·s), is kinematic viscosity (m²/s), and is fluid density (kg/m³).