How do you calculate the CO2 emissions of your ship as Chief Engineer?
Short answer
| Fuel | CF, tonnes CO2 per tonne of fuel |
|---|---|
| HFO | 3.114 |
| Light or very-low-sulphur fuel oil (VLSFO) | 3.151 |
| Marine diesel or gas oil (MGO) | 3.206 |
| LNG | 2.750 |
| Worked example | 100 t HFO and 20 t MGO: 311.4 + 64.12 = 375.52 t CO2 |
- Method: no funnel measurement; CO2 = Σ (fuel consumed by type × carbon conversion factor CF), the IMO EEDI and EEOI factors (carbon content × 44/12 ≈ 3.67).
- Factors (tonnes CO2 per tonne fuel): HFO 3.114, light or very-low-sulphur fuel oil 3.151, marine diesel or gas oil (MGO) 3.206, LNG 2.750.
- Worked: 100 t HFO and 20 t MGO: (100 × 3.114) + (20 × 3.206) = 311.4 + 64.12 = 375.52 t CO2.
- The real work: fuel masses by type from bunker delivery notes (regulation 18), soundings and ROB, meters and logs; bunkered minus remaining, reconciled with metered consumption.
- What it feeds: the Data Collection System (regulation 27, 5,000 GT and above); the attained annual CII (regulation 28) = CO2 / (capacity × distance), rated A to E; the voluntary EEOI; the SEEMP (regulation 26).
- As Chief Engineer: the rating turns on my fuel accounting and the levers that cut fuel: economical speed, clean hull and propeller, minimum auxiliary and boiler load.
Full answer
The full answer explains each point step by step, with the regulations and figures behind it and the discussion from other candidates. It is in the MEO Class I section of the Marine One forum, open to members enrolled for the MEO Class I exam.