Tower internals for oxygen-enriched service require system-specific ignition assessment, compatible materials, movement-resistant geometry, controlled fabrication, validated cleaning, representative inspection, sealed packaging, and clean installation. Ordinary visual cleanliness or a generic “oxygen compatible” declaration is insufficient. The owner and supplier must define the operating envelope, governing standard, acceptance tests, traceability, and response to any contamination or rework.

Polythionic acid stress corrosion cracking can attack sensitized austenitic stainless tower internals when sulfide scale encounters oxygen and moisture during shutdown. Prevention requires control of material condition, tensile stress, air ingress, washing chemistry, coverage, drainage, and outage sequence. If protection is lost, targeted surface-crack inspection and system-level assessment are necessary because serious cracking may occur without measurable general corrosion.

Tower-internal attachments on clad or weld-overlay shells must perform two functions: transfer loads into the structural base metal and maintain a continuous corrosion-resistant process surface. Reliable details define layer preparation, dissimilar-metal welding, dilution control, barrier restoration, staged inspection, and dimensional tolerances. Clear ownership between the vessel and internal suppliers prevents unsafe field improvisation at this critical interface.

Metallic tower internals can become electrically isolated by gaskets, coatings, deposits, corrosion, or removable joints. A reliable system identifies charge-generating operations, bonds every potentially isolated conductive assembly, connects it to the grounded vessel, accommodates corrosion and movement, and verifies continuity after installation and maintenance. Nonconductive packing requires additional process controls because a grounding wire cannot drain charge from an insulating surface.

Wet H₂S can cause sudden hydrogen-assisted cracking of tower-internal fasteners without major general corrosion. Reliable design requires a defined sour environment, suitable material and hardness, controlled heat treatment and thread condition, compatible joint preload, lot traceability, and qualified installation. PMI alone is insufficient, and one cracked fastener should trigger assessment of the complete batch and all equivalent joints.