OVERVIEW: The debris filter has been in service over 15 years, the rubber lining was showing signs of aging and required repairs due to under-film corrosion
INDUSTRY
Power Generation
ENVIRONMENT
Ambient
SUBSTRATE
Mild Steel Pipes
CHALLENGE
Outage duration was kept to a minimum to prevent disruption to existing commitments to the grid.
SOLUTION
Two different solutions were necessary, a fast setting corrosion resistant compound for the flange face where the rubber lining had failed. And for internals between the filter assembly and the body the power station reliability team were looking for ceramic filled epoxy.
SCOPE
Removal of delaminated rubber lining by mechanical means and high pressure hot wash removing all contamination. Abrasive blast removing all signs of corrosion and fabricate a casting board to enable the flange face to be refurbished to the original height of the damaged rubber lining.
PRODUCTS
Chem-tect RB300™ Series: a glass flake filled vinyl ester used to repair the rubber lining on the flange faces.
Ind-Cote™: a ceramic filled epoxy used to fill in the void between the screen and the pipe internals where cavitation was suspected.
OUTCOME
The restoration process involved a meticulous approach to surface preparation to guarantee the longevity of the filter. Mechanically cleaning surfaces was accomplished using a needle gun and scabbler, effectively eliminating heavy corrosion. Abrasive blasting ensured the removal of all rust and debris, providing a clean canvas for the subsequent application of protective coatings.
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