Boiler tube bank repair
OwnerMark W. Hillestadinventor
Life of this patent
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Abstract
A method for repairing boiler tube walls by cutting out and replacing a worn or damaged section thereof involves the use of a power tool having a rotary milling head specially adapted to remove membrane material from between tube ends which are exposed when the damaged section is removed. The method and apparatus of the invention allows for the rapid and precise removal of membrane material from between the exposed tube ends to facilitate subsequent bevelling and welding operations, while substantially reducing the risk of weakening or damaging the tube wall by avoiding excess removal of material therefrom.
Claims7
A method for removing membrane material from the area between exposed tube ends of a boiler tube wall from which a section thereof has been cut out for replacement with a new section, to facilitate milling of a frusto-conical bevel on an exposed tube end of said boiler tube wall and subsequent welding of said new section thereto, said method comprising:
- simultaneously removing membrane material from the areas immediately adjacent opposite sides of an exposed tube end using a motor-driven tool having a rotary milling head.
Dependencies are inferred from the claim text.