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.

Converting a fouling wire mesh demister to a vane separator can be valuable when mesh plugging drives pressure drop and shutdown frequency. The retrofit should confirm droplet-size requirements, fouling mechanism, gas velocity, pressure drop, drainage, vertical space, support design, and maintenance access before changing technology.