Case Studies
Green Liquor Clarifier Life Extended
Challenge
Issue
The existing green liquor clarifier had sprung several leaks and severe pitting corrosion had affected the tanks primarily at their weld zones.
Goals
The leaks in the clarifier need to be sealed and the tanks need to be preserved for continued use.
Root Cause
Severe caustic corrosion.
Blasted wall. Verifying cleanliness and profile prior to coating.
Solution
Preparation
Areas where the leaks had occurred were replaced with fresh steel. All surfaces were HP water washed and then were grit blasted to Sa 2.5 with a 75 – 125 µm (3 – 5 mil) angular profile.
Application
Chesterton® ARC 858 Abrasion Resistant Rebuilding and Faring Composite was applied as a stripe coat to all weld zones. ARC S5 Coating was then spray-applied in two coats of 375 – 500 µm/coat for a total DFT of 0.750 – 1 mm.
Stripe coating weld seams and spraying first coat of ARC S5 Coating.
Results
Client Reported
The tank was lined in 2023 after a two-year evaluation. Based on prior testing and an evaluation after the first year, the tank inspection cycle has been extended from once every 3 years to once every 5 years.
Final DFT of 0.75 – 1mm.
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EN601971. Issued 11/2024.
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