Poor mist-eliminator drainage can cause liquid accumulation, pressure-drop increase, and re-entrainment even when droplet capture is otherwise adequate. Retrofit should evaluate orientation, support obstruction, tower levelness, drainage channels, fouling, liquid load, gas velocity, and cleaning access.

Converting a one-piece mist eliminator into a sectional design improves future maintenance, but segmentation must preserve gas sealing, drainage, structural support, manageable section weight, and correct fit through the actual manway and internal access route.

When lightweight random packing has been lifted by gas flow, retrofit should combine adequate open-area bed restraint with review of gas surges, packing density, support attachments, distributor clearance, and actual hydraulic capacity. The limiter should restrain movement without compressing the bed.

Packing found below the bed support indicates a containment problem that can involve support damage, oversized openings, packing breakage, or perimeter gaps. Retrofit should correct the escape path, inspect lower internals, remove lost material, restore bed quantity, and confirm structural support condition.

When smaller random packing can fall through an existing support, the retrofit should use a retention solution with adequate open area, fouling resistance, and mechanical support. Fine mesh should not be added automatically, and the combined support system must be checked hydraulically.