Waterproofing of a carbon steel sedimentation tank at an industrial wastewater treatment plant; the tank was subject to numerous leaks caused by its advanced stage of corrosion.
The waterproofing intervention was preceded by a careful sandblasting of the entire internal surface of the tank, up to SA 2.5. Then, damages and holes were repaired.
After that, we proceeded with the sealing of the joints between the various sectors of the tank, using a specific polyurethane sealant, and with the application of a two-component epoxy primer on the entire surface.
For the final waterproofing of the tank was used a specific hot-applied two-component polyurea formulation based on PTMEG Modified Polyamines and semi-flexible aromatic isocyanates, extremely resistant to chemical agents and abrasion, applied with a bimixer spray machine.
The result was a continuous, elastomeric, protective and waterproofing membrane, adaptable to any geometric conformation, without joints and overflows and with high mechanical, chemical, biological resistance.
Due to these characteristics, this type of solution is considerably more resistant than a treatment with epoxy resins which, being more rigid, tend to crack over time, especially on metal surfaces that undergo continuous thermal expansion.
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