Boiler tube bank repair
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United States of America Patent
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Oct 18, 1994
Grant Date -
N/A
app pub date -
Nov 17, 1993
filing date -
Nov 17, 1993
priority date (Note) -
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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.
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