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Demister Internals

OVERVIEW:    The client  had a demister in service since ’96 without internal coating protection and recent weld repairs to localised corrosion pitting caused water and blast furnace gas leaks which required repairs and coating to extend shell life. 


Blast Furnace Gas and recirculated process water


Mild steel structure


Leading steel manufacturer has a demister in service since ’96 without internal coating protection. Deposits of sulphur, zinc and oxygen caused corrosion pitting 10mm deep in the demister internals. Weld repairs to localised corrosion pitting caused water and blast furnace gas leaks. Microbiological induced corrosion had resulted in extensive surface corrosion and pit-filling posed a time-constraint.

Client wanted a coating to extend shell life. Job had to be completed during shutdown duration of 72 hours with only 50 hours allocated to coating application.


We recommended RB 332, glassflake filled vinyl ester, for its quick cure time, low moisture vapour transmission rate, and excellent corrosion and electrical isolation protection in wet environments. This specialty coating provides excellent corrosion/erosion resistance.


Abrasive blasting of demister internals to remove dense residue

Potassium Ferrous Cyanide to determine surface cleanliness

Grinding and weld repairs to perforations

1st coat of RB 332 sprayed on to highlight pitting

DFT checks done after first coat and pit filling

Re-abrasive blasted floor to remove surface corrosion

Further pit filling to ensure quality coating

Top coat applied


As a result of the fast cure and good project management, the demister was back in service on time despite various delays. Coating was completed to client’s expectations and future scheduled inspections and additional tests will give a good indication of lifespan extension of demister internals.


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