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LNG Storage Tank Boil-Off Rate

Gas processing · BOG / heat ingress · NFPA 59A / BS EN 1473

Tank

Tank diameter

m

Tank height

m

Insulation thickness

mm

Insulation k

W/mK

Conditions

Ambient temperature

°C

LNG temperature

°C

Fill level

%

LNG density

kg/m³

Latent heat

kJ/kg

Engineering Basis

U ≈ k/thickness; A = πDH + 2·πD²/4; Q = U·A·(T_amb − T_LNG).
BOG = Q/latent heat; %/day = BOG_kg/day / liquid mass · 100.
Evolved vapor is methane-rich (weathering enriches the heel over time).
Typical large tanks ~0.05-0.15 %/day. Standards: NFPA 59A (2024), BS EN 1473.