| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.9 ( March 1984 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| A Large Diameter Pipe Epoxy Powder Coating Line and Product Quality Kazuhiko Miura, Hirosuke Konishi, Sadaharu Tanaka, Akihiko Ohara, Norio Kosuge |
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Synopsis : An epoxy powder coating line has been in operation since April 1983 at the UOE pipe mill plant of Chiba Works. The line serves for an external coating of the world's largest class pipe with its diameters ranging from 12" to 64" and its length 60' at max, particularly for enduses requiring good corrosion resistance and good coating adhesion. A unique chemical treatment of pipe exterior for an improved corrosion resisting property; a dual-layer application of paint - one for adhesion and the other for impact resistance; an effective use of preheating and postheating; a computer-aided quality assurance system in temperature control and automatic film thickness measurement; all these technical developments assure good adhesion and toughness of the coating against damages to surface during transportation, handling and construction, thus opening up a new horizon unattainable by the conventional single layer coating method. This paper discusses these new technical developments mainly from the viewpoint of coating materials and coating conditions. |
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