The company was approached recently with a difficult problem. A sludge buffer tank at a Wessex Water sewage treatment site fabricated from glass fused to steel (GFS) was suffering from through-wall corrosion at the vapour interface level. The client had only been able to run the buffer tank at a reduced capacity of 65%.

Belzona surface-tolerant epoxies were chosen for this repair. They are easily applied on-line to wet and oily surfaces where only minimal surface preparation is required. Repair plates pre-coated with Belzona 5831 (ST-Barrier) were cold bonded over the through-wall defects using Belzona 1831 (Super UW-Metal). Finally, Belzona 5831 was applied to the entire repair area to prevent future corrosion.

Chris Mills of Wessex Water commented: “We have been using Belzona cold plate bonding solution on GFS tanks and have saved a lot of time and money by doing so. We have also been able to repair tanks while they are still in service as the repair is a spark free repair.”