Single-voyage fuel and CO₂ from engine-load × hours × SFOC × Cf.
Formula
$$ F = \frac{P \cdot h \cdot \text{SFOC}}{10^6}, \quad \text{CO}_2 = F \cdot C_f $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $F$ | Fuel mass consumed on the voyage | t | result |
| $P$ | Delivered engine power at voyage load | kW | engine data |
| $h$ | Hours operated at that load | h | voyage log |
| $\text{SFOC}$ | Specific fuel consumption at the running load | g / kWh | NOx Technical File |
| $C_f$ | CO₂ conversion factor for the fuel burned | t CO₂ / t fuel | MEPC.364(79) |
| $10^6$ | Grams → tonnes conversion | - | constant |
Run the equation once per engine group (ME, aux, boiler) and sum. Different engines burning different fuels carry different $C_f$, so never lump their masses before applying Cf.
Sources
- IMO MEPC.364(79) - Cf conversion factors.
- IMO MEPC.282(70) - SEEMP guidance on voyage measurement.