On-site pipe coating process

B - Operations – Transporting – 05 – D

Patent

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B05D 7/14 (2006.01) F16L 58/10 (2006.01) B05D 5/00 (2006.01)

Patent

CA 2169165

A process for treating metal pipe in the field is provided, for repair, rehabilita- tion of protection. The process comprises coating at least part of a pipe surface with first an undercoat of a thermosetting poly- mer such as a polyurethane or polyepoxide and second with an overcoat of a polyolefin composition e.g. a grafted polyolefin or ethylene/acrylic acid copolymer. The over- coat is applied by thermospraying.

L'invention concerne un procédé de traitement de conduites métalliques sur le terrain, à des fins de réparation, d'entretien ou pour leur protection. Le procédé consiste à appliquer sur au moins une partie de la surface de la conduite une première couche d'apprêt d'un polymère thermodurcissable tel qu'un polyuréthanne ou un polyépoxyde, puis à appliquer une couche de revêtement d'une composition de polyoléfine, par exemple une polyoléfine greffée ou un copolymère d'éthylène/acide acrylique. La couche de revêtement est appliquée par pulvérisation à chaud.

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