Patent attributes
Boiler tubes are removed from a boiler vessel without damaging the vessel by severing the boiler tube near the exterior periphery of the vessel, and using a piloted rotary cutting tool fixtured with respect to the longitudinal axis of the severed boiler tube to remove all but a very thin shell of the severed tube. The rotary cutting tool is then withdrawn, and the remaining thin shell of the boiler tube is manually peeled away from the periphery of the boiler vessel opening. In a preferred implementation, the rotary cutting tool is annular, and a tapered cylindrical pilot having an outside diameter slightly smaller than the inside diameter of the expanded portion of the boiler tube is retractably mounted within the annulus of the cutting tool.
