REMOVING METHOD OF TUBE

摘要

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 3 a 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 3 a is loosened from the tube-hole 2 . Then, a region 3 h 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 3 h is stretched to reduce its diameter and cut the region 3 h, thereby pulling out the tube 3 from the tube-sheet 1.