Method of coating interior surfaces with riblets
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United States of America Patent
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Jun 18, 2019
Grant Date -
Apr 12, 2018
app pub date -
Oct 6, 2017
filing date -
Oct 6, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A method of applying a riblet structure coating on the internal surface of a pipe includes coating the internal surface of a pipe with a resin layer and applying a cavity mold having a reverse riblet pattern structure to the coated internal surface of the pipe. A flexible air bag is inserted into the interior of the pipe and charged with air to hold the mold against the coated internal surface of the pipe. The air bag may be charged with air for a sufficient amount of time to allow the coating to cure in the riblet shape of the mold. Afterwards, the air bag and the mold are removed from the pipe to yield a pipe coated with an internal riblet structure.
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