Boiler tube bank repair
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United States of America Patent
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Aug 6, 1996
Issued Date -
N/A
app pub date -
Jul 15, 1994
filing date -
Nov 17, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
A method and apparatus 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 and optionally to simultaneously bevel the end of a tube as membrane material is being 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 beveling and welding operations or for concurrent beveling and membrane removal, while substantially reducing the risk of weakening or damaging the tube wall by avoiding excess removal of material therefrom.
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