Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Yuji Kurokawa1
Michio Sato1
Hirotaka Yoshida1
Date of Patent
November 20, 2007
1Patent Application Number
111005681
Date Filed
April 7, 2005
1Patent Primary Examiner
Patent 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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