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LNG Heel for Return Voyage

Minimum LNG heel to keep cargo tanks cold during ballast leg, allowing next load without full cool-down.

LNGHeel
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Formula, assumptions, and limits

mheel=(m˙BOGt)+mspray(1+margin)m_\text{heel} = (\dot m_\text{BOG} \cdot t) + m_\text{spray} \cdot (1 + \text{margin})
SymbolMeaningUnit
m˙BOG\dot m_\text{BOG}Daily BOG masst/day
ttBallast-leg daysd
mspraym_\text{spray}Spray mass at arrivalt

Source: SIGTTO - LNG shipping operations

In short

Minimum LNG heel to keep cargo tanks cold during ballast leg, allowing next load without full cool-down.

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