LNG Tank - Displacement Purge Volume

Nitrogen volume required for a displacement (layered, density-driven) purge - used to inert LNG cargo tanks before gassing-up, ~1.05× tank volume when well-controlled.

LNGPurgeInerting

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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

V_{purge} = \frac{V_{tank}}{\eta_{disp}}

Symbol	Meaning	Unit
$V_{tank}$	Tank gross volume	m³
$\eta_{disp}$	Displacement efficiency

Source: SIGTTO - Liquefied Gas Handling Principles 4th ed

In short

Nitrogen volume required for a displacement (layered, density-driven) purge - used to inert LNG cargo tanks before gassing-up, ~1.

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