LPG / Gas Carrier CII

CII for LPG/ethylene/ammonia gas carriers. MEPC.353(78) uses two reference lines depending on size: ≥ 65,000 DWT uses (14405E7, 2.071); < 65,000 DWT uses (8104, 0.639).

Ship typeGas carrier

Ship & voyage

DeadweightDWTDistance / yearnmYear

Fuel

VLGCs often burn boil-off LPG directly in dual-fuel engines; others burn VLSFO/MGO.

FuelMasst

Reference line used: Gas carrier ≥ 65,000 DWT

Attained CII: 6.329g CO₂ / (dwt·nm)

Required CII: 8.731g CO₂ / (dwt·nm)

Rating: A

Major superior performance. No corrective action required.

Changing the inputs requires JavaScript. The calculator above shows its default inputs and result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

\text{CII}_\text{required} = a_\text{size} \cdot \text{DWT}^{-c_\text{size}} \cdot (1 - Z)

Symbol	Meaning	Unit
$Size band$	$a$	$c$
$≥ 65,000 DWT$	14405E7	2.071
$< 65,000 DWT$	8,104	0.639

Source: IMO MEPC.353(78), MEPC.338(76) as amended by MEPC.400(83), and MEPC.354(78); SIGTTO - Gas carrier operational guidance

In short

CII for LPG, ethylene and ammonia gas carriers using the size-split MEPC.353(78) reference lines (≥ 65 kt and < 65 kt DWT).

Learn the theory Gas Carrier Types: LPG and LNG Ship Classes