Removing method of tube
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United States of America Patent
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Nov 20, 2007
Grant Date -
Oct 27, 2005
app pub date -
Apr 7, 2005
filing date -
Apr 22, 2004
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The present invention provides a removing method of a tube. Upon removing a tube 3 increased in diameter and fixed to a tube-sheet 1, an inserted portion 3a which is fixed to a tube-hole 2 of the tube-sheet 1 is heated and then cooled, thereby reducing its diameter. The inserted portion 3a is loosened from the tube-hole 2. Then, a region 3h opposed to a groove 4 formed in an inner circumference of the tube-hole is heated to a red-hot state, and the tube 3 is stretched in its axial direction, the red-heated region 3h is stretched to reduce its diameter and cut the region 3h, thereby pulling out the tube 3 from the tube-sheet 1.
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