Nm³/h, Sm³/h, and actual m³/h can represent very different volumetric flows. Mist eliminator velocity should be calculated from actual gas flow at operating temperature and pressure, with the flow basis clearly defined.

A mist eliminator specification should define outlet carryover, inlet liquid loading, droplet-size basis, operating cases, and allowable pressure drop rather than relying only on a generic percentage efficiency. This creates a measurable and comparable performance requirement.

Packed-bed flooding can greatly increase and destabilize the liquid load reaching a mist eliminator. High downstream carryover may therefore originate from excessive gas/liquid loading, packing fouling, or maldistribution below the demister rather than from the separator itself.

Shutdown inspection should document fouling patterns, edge sealing, segment joints, mesh condition, supports, drainage, corrosion, and vane geometry before cleaning. Comparing these findings with pressure-drop and carryover history can reveal the true cause of mist eliminator problems.

Corrosion can reduce wire strength and collection surface, damage vane geometry, weaken supports, create bypass, and alter pressure drop. Mist eliminator corrosion should therefore be evaluated as both a mechanical and hydraulic performance issue.