Minimum Gas Combustion Unit (GCU) heat-release rate required to burn 100 % of boil-off gas at laden-passage conditions with the DF engines unavailable.
Formula
$$ \dot Q_{GCU} = \frac{V_L \rho_L \cdot BOR}{24} \cdot \text{GCV} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $V_L$ | Laden cargo volume | m³ | cargo plan |
| $\rho_L$ | LNG liquid density | kg/m³ | Klosek-McKinley |
| $BOR$ | Boil-off rate | %/day | tank insulation spec |
| $\text{GCV}$ | Gross calorific value | MJ/kg | ISO 6976 |
Sources
- IGC Code 2016 - Ch. 8.
- SIGTTO Gas-Up & Cool-Down Guidance.