Two-size reference-line regime for LPG / ethylene / ammonia carriers.
Formula
$$ \text{CII}_\text{required} = a_\text{size} \cdot \text{DWT}^{-c_\text{size}} \cdot (1 - Z) $$Symbol legend
| $Size band$ | $a$ | $c$ | d-boundaries (d1, d2, d3, d4) |
|---|---|---|---|
| $≥ 65,000 DWT$ | 14,405.9 | 0.622 | 0.81, 0.91, 1.12, 1.44 |
| $< 65,000 DWT$ | 8,104 | 0.639 | 0.85, 0.95, 1.06, 1.25 |
VLGCs (≥ 65 kt) get wider bands - the expected fuel mix and operating profile vary more than smaller gas carriers.
Sources
- IMO MEPC.337/338/339(76).
- SIGTTO - Gas carrier operational guidance.