LNG BOG Compressor - Shaft Power

Adiabatic shaft-power estimate for a boil-off gas (BOG) compressor handling methane from atmospheric tank vapour to the DF-engine supply pressure.

LNGCompressorBOG

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

P_{shaft} = \frac{\dot m \cdot c_p \cdot T_1 \cdot \left[\left(\frac{p_2}{p_1}\right)^{\frac{k-1}{k}} - 1\right]}{\eta_{ad}}

Symbol	Meaning	Unit
$\dot m$	BOG mass flow	kg/s
$c_p$	Specific heat at constant pressure	kJ/kg·K
$T_1$	Suction temperature	K
$k$	Isentropic exponent
$\eta_{ad}$	Adiabatic efficiency

Source: GIIGNL Handbook - BOG Management; NIST Chemistry WebBook - methane

Adiabatic shaft-power estimate for a boil-off gas (BOG) compressor handling methane from atmospheric tank vapour to the DF-engine supply pressure.