Clearance above and below a mist eliminator affects gas distribution, liquid drainage, outlet flow concentration, spray interaction, installation, and maintenance. Correct separator elevation and surrounding space are essential for stable vessel-level performance.

A two-stage mist elimination system can be useful when high liquid loading, broad droplet-size distribution, or strict outlet carryover requirements make a single separator impractical. The first stage handles bulk entrainment while the second provides finer polishing.

Spray nozzle type, pressure, flow rate, angle, position, and condition can change droplet size distribution and liquid loading reaching a mist eliminator. Changes upstream can therefore cause demister carryover, re-entrainment, or fouling even when the separator itself is unchanged.

Over-compression of a wire mesh demister reduces void space, increases hydraulic resistance, can restrict drainage, and may create uneven gas distribution. Correct segment sizing and controlled hold-down installation are essential to preserve the intended mesh structure.

Average face velocity can hide local high-velocity zones caused by inlet momentum, upstream maldistribution, fouling, segment resistance, or vessel geometry. Local gas velocity often controls re-entrainment and separator stability more strongly than the calculated average velocity.