Digester lining and repair
Kraft digesters carry hot sulfate-rich liquor that thins linings and corrodes every weld and access port over a single campaign.
What is failing
Kraft digesters run hot sulfate-rich liquor that grinds down conventional linings and corrodes every weld and access port. A single campaign can thin the shell enough to threaten the next run. Once the liner fails, the mill faces either an extended outage or a welded liner replacement, both of which stop production.
How AAS does it
Our crew prepares the interior and applies a ceramic-filled high-temperature immersion lining built for hot chemical service, supported by the Belzona 1391T system. Where acid attack drives the failure, we add a chemical-resistant overlay matched to the liquor. The repair cures cold, so there is no liner-replacement weld cycle and no hot work in a confined vessel.
Typically applied with Belzona 1391T, Belzona 4341, matched to the service conditions.
The digester returns to campaign with a fresh immersion barrier over the shell and welds, avoiding the cost and downtime of a welded liner swap.
How AAS delivers it
AAS performs Digester lining and repair work for Pulp & Paper, Water & Wastewater, and Petrochemical & Chemical operations across Baton Rouge and Louisiana, cold-applied and in place wherever possible, on your turnaround schedule. Crews are factory-trained Belzona applicators, the repair system is matched to the service conditions it will see, and urgent failures are covered by 24-hour on-call response. The result is a permanent, engineered repair that returns the asset to service without the cost or downtime of full replacement.
Related applications
Have equipment that needs to stay in service?
Tell us what is failing. We respond quickly, and we offer 24-hour on-call service.