This technical publication explains why accurate measurement of LNG tanker boil-off gas (BOG) is critical for energy efficiency, regulatory compliance, and emissions reduction. As LNG warms during transport, vaporized gas is routed to ship boilers as fuel, requiring precise mass-flow measurement to meet IMO efficiency regulations. The paper details how thermal dispersion flow meters—specifically FCI’s ST110 series—provide direct mass-flow measurement without moving parts, support wide turndown ratios, enable in-situ calibration, and deliver reliable performance in harsh LNG tanker and terminal environments.

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