Ignition-quality index for residual marine fuels. CCAI = ρ₁₅ − 81 − 141·log(log(ν₅₀ + 0.85)). Values > 870 correlate with hard-starting and combustion noise.
Formula
$$ CCAI = \rho_{15} - 81 - 141 \cdot \log_{10}(\log_{10}(\nu_{50} + 0.85)) $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $\rho_{15}$ | Density at 15 °C | kg/m³ | BDN certificate |
| $\nu_{50}$ | Viscosity at 50 °C | cSt | BDN certificate |
| $CCAI$ | Calculated Carbon Aromaticity Index | - | result |
Sources
- ISO 8217 Annex D.
- Shell / ExxonMobil CCAI technical notes.