Renovating pipelines

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B - Operations, Transporting

05

D

B05D 7/22 (2006.01) B05D 1/02 (2006.01) B05D 3/02 (2006.01) B05D 7/24 (2006.01) F16L 58/02 (2006.01) F16L 58/10 (2006.01)

Patent

CA 2530280

A two part coating system comprises a first part comprising one or more aliphatic polyisocyanates, and a second part comprising one or more aromatic polyamines. In one group of embodiments, the second part comprises one or more aromatic polyamines, blended with one or more polyhydric alcohol compounds. In another group of embodiments, the polyhydric alcohol compounds are dispensed with and the required properties are achieved by selection of the type of polyisocyanate compound used and by close control of the proportions thereof. The coating system is suitable for application by spraying using equipment in which the two parts are first combined at the point of spraying, and may be applied to the internal surfaces of below-ground pipeline infrastructures, for example by means of a centrifugal spinning head assembly. In particular, the system may be used for the renovation of existing drinking water pipelines.

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