Method of improving the surface of steel pipe for corrosion resistant coating
AssigneeShaw Industries Ltd.
InventorsStephen E. McConkey, Guntrum N. Franzky
Life of this patent
Estimating the term…
Abstract
Surface anomalies on pipe are removed preparatory to corrosion coating. The removal is conducted by brushing with wire brush elements or COMAX brush elements which may rotate about axes parallel to the pipe axis or substantially radially off the pipe. Both kinds of brush elements may be used in combination. Before subjecting the pipe to brushing, the surface is particulate blasted to remove ferric oxide and better expose surface anomolies. After wire brushing, the surface is again particulate blasted to provide an anchor pattern of indentations promoting adhesion of the coating.
Claims13
Method of improving a surface of steel pipe for coating comprising a sequence of the following steps:
- (a) subjecting the surface of said pipe to particulate blasting to remove substantially all ferric oxide therefrom, thereby producing a blasted pipe surface;
- (b) applying to said blasted surface a wire brush element comprising wires extending generally radially with respect to the pipe and having free wire ends adjacent the pipe surface, biasing the free ends of the wires into abrasive engagement with the pipe surface, and rotating the wires relative to the pipe surface to abrade off substantially all surface anomalies from the pipe and provide a substantially smoothly curved abraded pipe surface;
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- (c) subjecting said abraded surface to particulate blasting to form indentations therein thus providing an anchor for a plastic coating.
Dependencies are inferred from the claim text.