Long term protection for waste water pipes

Jul 06, 2015

When a major utilities company was carrying out a massive extension to one of its waste water treatment plants, it selected Corroserve to apply a protective coating system to the interior and exterior surfaces of the 2.4 m diameter pipework which takes treated wastewater out to sea.

With the potential of carrying up to 11,000 litres of water a second, an effective anti-corrosion lining with low maintenance and lifetime costs was required. The contract was put out to tender to several coating contractors and after due consideration the proposal submitted by Corroserve was selected.

The anti-corrosion package applied by Corroserve comprised:
  • Grit blasting the pipes internally and externally to ISO 8501-1 cleanliness standard SA 2 ½.
  • Applying Polyglass VEF to the internal pipe surfaces. This glass flake vinyl ester acrylic co-polymer was applied at 1500 microns to provide superior resistance to chemical attack.
  • To give extra protection at key erosion points such as bends, Corrocoat Armagel - an abrasion resistant vinyl ester co-polymer containing glass flake and silicon carbide was applied at 1000 microns.
  • For the external surfaces Zip E was applied. This durable glass flake coating provides effective protection in the aggressive atmospheric conditions found at waste water treatment plants.

The contract was completed on budget and on schedule. A spokesperson for the client commented: "Corroserve were selected as they were able to show a large portfolio of similar successfully completed several projects. Their work was to the highest standard and by using the well-respected Corrocoat products they were able to offer us a 60-year lifespan guarantee - something their competitors could not."

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