Product / Chemical Tanker CII
CII for clean-product (MR, LR1, LR2) and chemical tankers. Same MEPC.337 reference line as crude (a=5247, c=0.610) - tanker type is treated as one in the CII regime despite the different operational profile.
Ship & voyage
Fuel
Product/chemical tankers often burn more MGO share than crude due to port calls and coastal trades.
Attained CII
6.747g CO₂ / (dwt·nm)
Required CII
6.495g CO₂ / (dwt·nm)
Rating
C
Moderate performance. Compliant.
Formula, assumptions, and limits
$$\text{CII}_\text{required} = 5247 \cdot \text{DWT}^{-0.610} \cdot (1-Z)$$
Product tankers typically have a harder time hitting A/B bands because their average laden ratio is lower than crude (more short-sea and port-frequent trades). D-boundaries are identical (tanker row): d1=0.82, d2=0.93, d3=1.08, d4=1.28.
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