LNGCs use a unique flat MEPC.337 reference line (a=9827, c=0) reflecting the narrow size range and homogenous trading patterns.
Formula
$$ \text{CII}_\text{required} = 9827 \cdot \text{DWT}^{0} \cdot (1 - Z) = 9827 \cdot (1 - Z) $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $DWT$ | Deadweight | t | tonnage certificate |
| $Z$ | Annual reduction | fraction | MEPC.338(76) |
LNG-C d-boundaries: d1=0.89, d2=0.98, d3=1.06, d4=1.13 - narrow bands compared to other ship types.
Sources
- IMO Resolution MEPC.337/338/339(76) - LNG carrier reference.
- MEPC.364(79) - LNG Cf with methane slip.
- SIGTTO - LNG carrier operational standards.