Patent ID: 8833293
Filing Date: 2014-09-16
Classification: B05C,B05D,F16L,Y10S

Abstract:
1. A pig device for use in the application of a coating material to a tube, comprising: a main body portion; a generally spherically shaped sponge disposed at a first end of the main body portion, said first end being the end of said pig that is first inserted into a tube to be coated, said sponge being compressible to enable the passage of a coating beyond the sponge and having a diameter that is greater than a diameter of said main bodyportion; and an end flange disposed at a second end of the main body portion, said end flange terminating in a flat and continuous rear surface and forming a continuous, solid edge extending without interruption around a periphery of said second end of said main body portion, said solid edge being capable of forcing a coating material into erosion elements and pits in an inner surface of said tube while wiping away excess coating material to result in a thin, single layer coating formed on said inner surface of the tube, said thin, single layer coating is sufficiently thin so as to not significantly inhibit heat transfer capabilities of the tube.