You're on night shift and typing "estimate LNG tank boil off gas rate per day quick check" while staring at a 160,000 m³ full-containment LNG tank. The DCS shows average BOG at 0.18% vol/day. As-built insulation heat leak is 8 W/m², tank diameter 80 m, straight-side height 40 m. No recondenser upset flagged. What's the most defensible back-of-envelope position?

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Accepted Answer

A: Surface area ~15,000 m² times 8 W/m² is ~120 kW. Divide by LNG latent heat and inventory, you land near 0.1%/day. That's the sanity check you do at 2 a.m.
B: Vapor density doesn't rescue the energy balance; heat leak still rules.
C: Roof losses matter, but not enough to double the rate at this scale.
D: CFD refines it later; this call is about order-of-magnitude risk triage.

Storage tank design with special focus on Cryogenic fluids

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