LNG Heel for Return Voyage

Contents

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

Formula

$$ m_\text{heel} = (\dot m_\text{BOG} \cdot t) + m_\text{spray} \cdot (1 + \text{margin}) $$

Symbol	Meaning	Unit	Source
$\dot m_\text{BOG}$	Daily BOG mass	t/day	vessel performance
$t$	Ballast-leg days	d	voyage plan
$m_\text{spray}$	Spray mass at arrival	t	typical 50–80 t