Flash gas flashed from LNG after a wound coil end-flash exchanger | Source: PalladianPublications (2021)

Flash gas is the light hydrocarbon vapour fraction generated when a pressurised process liquid undergoes rapid pressure reduction across a control valve or in a dedicated flash vessel, causing dissolved light gases to vaporise. It occurs at multiple points across a gas processing plant wherever a high-pressure liquid stream is let down to a lower operating pressure.

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