Six coolers at a Nuclear Power Station were inspected and found that all 12 faces have signs of heavy corrosion and will require rebuilding back to profile and coating before being put back into service.
To build back the surface profile and offer long term protection against corrosion, Belzona 1311 was recommended to rebuild the damaged surface back to profile. Belzona 1321 (Ceramic S-Metal), a 2-part epoxy coating was applied to provide erosion and corrosion resistance.
Cork up all tubes for protection. Surface preparation will be carried out by grit blasting the tube faces in our state-of-the-art blast booth. Once the steel substrate has been prepared to a standard of minimum surface profile of 75µm and a surface cleanliness of SA 2½.
Our technicians dressed back the corks to a flush profile before cleaning down and applying Belzona 1311 to all damaged areas. The following day these faces will be sanded back using power tools to the correct profile.
Next, all areas will have two coats of Belzona 1321 at a target thickness of 375µm per coat. This will then be left to cure overnight again. The following day all corks will be tapped into the tubes, breaking the Belzona seal and then dressed back individually using die grinders with stone bits. Once all corks and tubes are dressed, these corks will be blown out from one face and exit the opposite. Upon completion all works will be inspected and if required remedial action taken.
By choosing Belzona for the refurbishment of six heavily corroded coolers at this nuclear power station, the customer achieved a reliable, long-term repair solution without the need for costly replacement.
This cold-applied repair method eliminated the need for hot work, minimized safety risks, and significantly reduced downtime, allowing the equipment to be returned to service efficiently.
From first assessment to final inspection, our team of experts offer a turnkey solution to your repair and maintenance needs
