PURPOSE: A graphite coating device is provided to determine the defects of a conduit tube by removing remaining graphite in the conduit tube. CONSTITUTION: A graphite storage tank(100) stores graphite. A graphite transfer device(200) transfers graphite from the graphite storage tank. A graphite supply device(300) supplies graphite to a conduit tube from the graphite transfer device. A clear device(400) is installed in the leading end of the graphite supply device and removes foreign materials from the surface of the conduit tube. A graphite filter device(700) filters graphite powder from a graphite recovery device.
