Page 195 - CW E-Magazine (3-12-2024)

Special Report

Corrosive Species/ Material of Construction Type of Corrosion PTFE exchanger: stainless steel or, Hastelloy OCl – /General plate exchangers: shell-and-tube exchangers FRP for Wet chlorine and mild steel for dry chlorine OCl – /General Monel or Hastelloy OCl – /General Alloy 20 FRP, glass or polyester fiber elements Carbon steel, glass fiber elements held in stainless steel Brick-lined, Ti Ni or Mo–Co alloys (e.g..

Table 5: Materials of construction in a Chlor-Alkali Plant

Equipment Acid coolers Pipelines Trims Acid pumps Mist eliminator, wet gas Mist eliminator, dry gas CI 2 scrubbers H 2 SO 4 Handling Pumps Vessels Piping Valves Caustic system vessels Evaporators Pumps Piping HCI section Vessels Pumps Piping/valves Hydrogen section Vessels Compressors/blowers Piping/valves

Corrosive Species/ Material of Construction Type of Corrosion Rubber-lined carbon steel, fiberglass rein- H + /General forced polyester, spray or trowel-applied organic linings, Ti lined carbon steel, carbon steel with 3.2mm corrosion allowance. Ti, rubber-lined steel H + /General Ti, Monel H + /General FRP body with rubber diaphragm, PTFE H + /General Cast iron, carbon steel, FRP, PVC,PP, H + /General rubber-lin

Equipment Brine section Vessels and tanks (i.e.. salt saturators, clarifiers, chemical storage and brine storage) Pumps Heat exchangers, ejectors Brine valves Brine pipelines Electrolytic section call room foundation Electrolytic cell cell covers cell bottom Sleeves Seals Doglegs Feed and return brine headers Caustic headers Wet Cl 2 headers Water fed to cells Anodes Cath

Chemical Weekly December 3, 2024 195

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