OVERVIEW: Chemcote were approached to refurbish the recirculated water condenser unit from 1981. Repairs were made to tubes that were leaking out onto the tube sheet and localised areas of metal loss that were affecting the tube sheet interface.
INDUSTRY
ENVIRONMENT
Up to 60°C Recirculated Water
SUBSTRATE
Cast Iron
CHALLENGE
The condenser unit was manufactured in 1981 and installed shortly after. There was some metal loss in localised areas across the tube sheet and some of the tube to sheet interface was affected. It was also found that some tubes were leaking out onto the tube sheet.
SOLUTION
We recommended coating with RP 500, an epoxy coating utilising very robust ceramic technology. RP 500 provides a hard wearing, abrasion resistant impermeable barrier to provide long term protection in this environment.
SCOPE
Abrasive blast to AS1627.4, 75 µm nominal profile and removal of all existing coating
Application of RP 500 in one coat at 250 µm
Perform Wet Film Thickness test to ensure proper coverage
Pit fill to provide a smooth finish and coating continuity
Application of second coat of RP 500 at a total nominal thickness of 500 µm
Perform wet film thickness test to ensure proper coverage
PRODUCTS
OUTCOME
Chemcote was able to refurbish the tube sheets within the strict time frame given by the client. This application will provide at least 10 years of condenser corrosion protection.
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