Daily BOR from tank surface, U-value and temperature drop - useful cross-check against trial-measured BOR.
Formula
$$ Q = U \cdot A \cdot \Delta T, \quad BOG = \frac{Q \cdot 3600}{h_{fg}} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $A$ | Tank outer surface area | m² | GA plan |
| $U$ | Insulation overall U-value | W/(m²·K) | insulation spec |
| $ΔT$ | Outer − LNG temperature | K | typical 175 K in ambient air |
| $h_{fg}$ | LNG latent heat | kJ/kg | thermodynamic table |
Sources
- SIGTTO - LNG operational guidance.