Removing method of tube

Details Removing method of tube Removing method of tube

2007-11-20

2007-11-20

Van, Quang (Department: 3742)

Electric heating

Inductive heating

Specific heating application

C029S426400

Reexamination Certificate

active

11100568

ABSTRACT:
The present invention provides a removing method of a tube. Upon removing a tube3increased in diameter and fixed to a tube-sheet1, an inserted portion3awhich is fixed to a tube-hole2of the tube-sheet1is heated and then cooled, thereby reducing its diameter. The inserted portion3ais loosened from the tube-hole2. Then, a region3hopposed to a groove4formed in an inner circumference of the tube-hole is heated to a red-hot state, and the tube3is stretched in its axial direction, the red-heated region3his stretched to reduce its diameter and cut the region3h, thereby pulling out the tube3from the tube-sheet1.

REFERENCES:
patent: 3492453 (1970-01-01), Hurst
patent: 3986245 (1976-10-01), Savor et al.
patent: 4421160 (1983-12-01), Stafford et al.

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