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LNG Boil-Off Rate from Heat Ingress

Daily BOR from tank surface, U-value and temperature drop - useful cross-check against trial-measured BOR.

LNGBoil-off
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Formula, assumptions, and limits

Q=UAΔT,BOG=Q3600hfgQ = U \cdot A \cdot \Delta T, \quad BOG = \frac{Q \cdot 3600}{h_{fg}}
SymbolMeaningUnit
AATank outer surface area
UUInsulation overall U-valueW/(m²·K)
ΔTΔTOuter − LNG temperatureK
hfgh_{fg}LNG latent heatkJ/kg

Source: SIGTTO - LNG operational guidance

In short

Daily BOR from tank surface, U-value and temperature drop - useful cross-check against trial-measured BOR.

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