OVERVIEW: The Leading Steel Manufacturer had a preheater in service for a number of years with previously applied coating failing due to poor coating selection and surface preparation and was after a coating to extend service life.
Work had to be completed during a short shutdown duration with only 60 hours allocated for coating application.
INDUSTRY
ENVIRONMENT
Coke Ovens Gas and residue
SUBSTRATE
Mild steel substrate
CHALLENGE
Leading steel manufacturer has a preheater in service for a number of years with previously applied coating failing due to poor coating selection and surface preparation. Weld repairs to shell plate were carried out 4 years prior due to the corrosion allowance exceeding parameters.
Engineer was after a coating to extend service life. Work had to be completed during a short shutdown duration with only 60 hours allocated for coating application. Arrangements were made overnight to mobilise the site first thing the following morning.
SOLUTION
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 coating system provides excellent corrosion/erosion resistance.
SCOPE
Abrasive blasting to remove dense residue
Potassium Ferrous Cyanide to determine surface cleanliness
Grinding and weld repairs to perforations 1st coat of RB 332 hand applied
DFT checks done after first coat and pit filling Top coat applied
PRODUCTS
OUTCOME
As a result of the fast cure and good project management, the preheater was back into service on time despite various delays. Coating was completed to client’s expectations and future scheduled inspections will ensure long term protection.
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