Jun 01, 2007
A corrosion solution to ‘pig-out’ onBack
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© Reuse this Significant time and money could be saved in the mechanical and chemical cleaning, surface preparation and recoating of underground water reticulation pipelines in South Africa, through the use of on-site pipe-pigging technology, says corrosion engineering specialist Corrocoat South Africa’s MD Louis Pretorius.
Pretorius says that maintenance of the internal surfaces of pipes is far more problematic than the external surfaces, owing in part to severe access constraints. South African municipalities have already identified that large amounts of water are being lost every day owing to pipe leaks caused by corrosion.
To create the GRP, a thick, liquid, cold-curing polymer resin, is applied to the internal pipe surfaces using specialised coating pigs, controlled by compressed air. The resultant GRP lining cures within 24 hours, effectively creating a polymer pipeline within the existing corroded steel pipe line. The GRP can be installed over distances of up to 45 km on a single pig run, says Pretorius. The coating technology has also evolved from 50
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