Crude Oil Tanker CII
Fast CII rating for crude oil tankers (VLCC, Suezmax, Aframax, Panamax). Uses the MEPC.337(76) tanker reference line (a=5247, c=0.610) and MEPC.339(76) tanker d-boundaries. Capacity basis is DWT.
Ship & voyage
Fuel
Typical crude tanker burns VLSFO laden, MGO in ECAs. Use the bunker-mass totals from your IMO DCS report.
Attained CII
6.177g CO₂ / (dwt·nm)
Required CII
4.015g CO₂ / (dwt·nm)
Year Z = 9%
Rating
E
Inferior - SEEMP Part III corrective action plan required.
Formula, assumptions, and limits
$$\text{CII}_\text{attained} = \frac{\sum_j F_j \cdot C_{f,j} \cdot 10^6}{\text{DWT} \cdot D}, \quad \text{CII}_\text{required} = 5247 \cdot \text{DWT}^{-0.610} \cdot (1 - Z)$$
Tanker d-boundaries from MEPC.339(76): d1=0.82, d2=0.93, d3=1.08, d4=1.28. Wider than bulker bands - reflects the higher variability of tanker trades (ballast legs, ice, STS, cargo heating).
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