Evaporator Vessel Hygienic Lining

The challenge

An evaporator vessel that holds product runs hot and wet, and over time the interior surface corrodes and pits. As the steel breaks down, the surface roughens and metal loss spreads across the walls, and that rough, pitted face traps residue and holds onto soil that cleaning cannot fully reach. In a process where the surface touches product, that is a hygiene problem as much as a corrosion problem, and it puts the vessel at risk of being pulled from clean service. The owner needed the interior brought back to a sound, cleanable condition without replacing the vessel.

Our approach

We bring the vessel back in two parts, the substrate and the finish. First we blast the interior to clean, profiled steel and rebuild the pitted and corroded areas cold with a Belzona 1000 Series composite, restoring the wall profile so there is sound steel under the lining. Then we apply a Belzona 5000 Series lining keyed to the process and finish it smooth, so the surface contacting product is continuous and cleanable rather than rough and pitted. We work the interior in stages to keep the crew moving and hand the vessel back ready for clean service.

1. Assess and mapWe inspect the interior to locate pitting and metal loss and confirm the process so the rebuild and lining are matched to the duty.
2. Blast to clean steelWe grit-blast the interior to a clean, profiled surface so both the composite and the lining bond to bare steel.
3. Rebuild the substrateWe rebuild the pitted and corroded areas cold with a Belzona 1000 Series composite, restoring the wall profile with no hot work.
4. Apply the hygienic liningWe apply a Belzona 5000 Series lining over the rebuilt steel and finish it smooth for a continuous, cleanable product-contact surface.
5. Inspect and return to serviceWe check the finished lining and turn the vessel back over to the owner ready for clean process service.