Method of Removing Boiler Tubes

 

A Boiler Tube Removal is normally accomplished by cutting the tubes at their outer periphery, heating the stub of the tube, notching the forks of the torches, and thereby forcing the tube loose from the boiler vessel. Boiler tube removal may involve cutting off the tubes close to the exterior periphery of the boiler vessel until the tubes can be removed.

To remove boiler tubes from a boiler vessel without damaging it, it is necessary to sever the boiler tube near the exterior perimeter of the vessel, and then to remove all but a thin shell of the severed boiler tube with a piloted rotary cutting tool placed in relation to the longitudinal axis of the severed boiler tube. The rotary cutting tool is then withdrawn from the boiler vessel opening, and the remaining thin shell of the boiler tube is manually peeled away from the periphery of the opening in the boiler vessel. 

This method of cutting rotary tubes is particularly useful in preventing the expansion of the boiler tube outside of its expanded diameter in some applications. In some applications, the rotary cutting tool is annular, and a tapered cylindrical pilot with an outside diameter slightly smaller than the inside diameter of the expanded portion of the tube is mounted retractably within the annulus.

There is a method of removing a boiler tube that is embedded within an opening in a boiler vessel, where the boiler tube is positioned between the opening and the boiler tube is retained; in the method, the following steps are performed: severing the boiler tube near the exterior periphery of the boiler vessel; centering a rotary cutting tool around the longitudinal axis of the severed boiler tube, A cutting tool that has a cutting diameter larger than the inside diameter of the boiler tube but smaller than the diameter of the opening is referred to as a rotary cutting tool; advancing the rotary cutting tool into the boiler tube so that all but a thin shell of said boiler tube is removed; retracting the rotary cutting tool out of said boiler tube; and peeling the thin shell away from an inner periphery of said boiler tube.

A portion of boiler tube is radially expanded against an inner periphery of opening to secure boiler tube in opening, and the method includes the steps of: affixing a cylindrical pilot to rotary cutting tool, said pilot having an outside diameter slightly smaller than an inside diameter of the radially expanded portion of said tube; advancing pilot into boiler tube ahead of rotary cutting tool; advancing the rotary cutting tool into the boiler tube and partially drilling into boiler tube until pilot contacts an un-expanded portion of boiler tube; retracting the rotary cutting tool out of the boiler tube and removing pilot.

 

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