Pickling and passivation of stainless-steel tower internals should be specified according to fabrication condition and process-corrosion requirements. Pickling removes oxide and heat tint, while passivation supports restoration of the stainless passive surface; neither replaces material verification or proper cleaning.

Thin-sheet liquid distributors and other tower internals may experience flow-induced vibration and fatigue even when static design loads are acceptable. Long unsupported spans, local gas velocity, loose connections and weld stress concentrations should be considered where process pulsation or repeated vibration is credible.

Field cutting, drilling, bending or welding of tower internals should be controlled through documented measurement and engineering review. Modifications affecting hydraulic openings, structural members, material grade or leak-tight joints should be reinspected and incorporated into final as-built records.

Temporary shipping braces can protect thin and segmented tower internals during transport, but they should be clearly identified on the component and installation drawing. Their required removal stage must be defined and verified before tower closure so temporary parts do not become permanent hydraulic obstructions.

Liquid distributor feed connections should be coordinated with the actual vessel nozzle elevation, orientation, projection and installation access. External piping loads should not unintentionally distort thin tower internals, and retrofit projects should verify fixed nozzle geometry before distributor fabrication.