Method and apparatus for applying internal coatings to vessels

Abstract

The problem of distortion in the shape of the vessel by simultaneous heating and rolling at high temperatures is remedied by adding shape retaining, firing rings to the vessel. Firing rings are rings spacedly attached to the periphery of the vessel to maintain the vessel out of direct contact with the rotating means while the vessel is heated to glass firing temperatures. Usually two rings are used, however, more than two may be utilized if desired. The rings extend a sufficient distance from the vessel side so that distortion of the vessel during glassing and rolling is prevented. Typically, the rings extend outward from the vessel wall a distance of from about 2 inches to about 18 inches and, more preferably, from about 4 inches to about 12 inches. The firing rings are loose fitted, or mounted, over the vessel exterior and preferably are positioned near or at the knuckle radius or radii of the vessel. A further advantage to the present invention rings is that the cylindrical vessel to be glass lined frequently has protrusions extending from the outside wall, for example, nozzles, access ports, pipe connection or sight glass locations. Such outward extensions would normally prevent rotation of the vessel, however, the use of the present firing rings selected to extend further outward from the vessel wall than such extensions, allow such vessels to be rotated and coated.