24/01/2026
Knock-Out Drum (KOD)
A Knock-Out Drum is a simple mechanical separator used in oil & gas and process plants to remove free liquid droplets and solids from a gas stream. The gas–liquid mixture enters the drum at reduced velocity, allowing heavier liquid droplets to settle by gravity while the lighter gas flows upward.
Inside the drum, inlet devices and baffles reduce turbulence, and a demister pad or vane pack in the upper section captures fine liquid mist. Separated liquid collects at the bottom and is drained, while clean gas exits from the top or side.
KODs are mainly installed upstream of compressors, flare systems, and burners to prevent liquid carryover, equipment damage, and efficiency loss. They are not meant for fine separation but are highly effective for bulk liquid removal and surge handling.
👉 In short: protective equipment for gas systems, ensuring only dry gas moves forward.
Mechanical engineering world
