A mist eliminator located too close to a gas outlet can experience highly nonuniform face velocity and local re-entrainment. Retrofit should consider separator elevation, disengagement distance, outlet geometry, wall sealing, drainage, and the possibility that the outlet nozzle itself limits capacity.

A sagged or compressed mist eliminator should be investigated for inadequate support spacing, liquid accumulation, fouling weight, installation compression, gas force, and maintenance damage. Retrofit should restore correct separator geometry while maintaining drainage and high gas-flow area.

A corroded mist-eliminator support can often be replaced while reusing serviceable separation media. The retrofit should identify the corrosion mechanism, calculate actual loads, preserve gas open area and drainage, inspect shell attachments, and confirm fit of the reused separator on the new support.

Mist-eliminator wall bypass can defeat otherwise adequate separation media. Retrofit should correct gaps caused by vessel ovality, damaged edge plates, support misalignment, lining irregularity, and poor field fit while preserving drainage and practical installation tolerance.

Replacing an existing vane separator with wire mesh may improve fine-droplet capture in clean service, but the retrofit must check fouling tendency, face velocity, pressure drop, liquid loading, support, sealing, available height, and actual downstream carryover requirements.