| 摘要 |
<p>Device and method for sleeving an inside surface (40) of a tube (30), which tube may be a heat transfer tube of the kind typically found in nuclear steam generators. The device comprises a sleeve (230) having a wall (310) forming a compact spiral-shaped transverse cross section defining a first position of the sleeve. The wall in its first position surrounds an expandable bladder (240) supported by a support body (360). The support body, bladder and sleeve are inserted into the tube and translated along the inside surface thereof to the region of the tube to be sleeved. The compact spiral-shape of the wall in its first position allows it to pass unimpeded through the inside diameter of a previously installed sleeve that may be disposed in the tube, so that the previously installed sleeve does not interfere with the translation of the sleeve along the inside surface of the tube. Connected to the bladder is a pressurizer (250) for pressurizing the bladder so that the bladder expands to expand the wall of the sleeve (after it passes through the inside diameter of the previously installed sleeve) from the first position to a second position wherein the wall forms an annular transverse cross section. A fluid reservoir (260) is in fluid communication with the pressurizer for supplying fluid to the pressurizer which in turn pressurizes the fluid and supplies the pressurized fluid to the bladder to pressurize and expand the bladder. As the bladder expands, the wall moves from its first position to its second position and intimately engages the inside surface of the tube for sleeving the tube. <IMAGE></p> |
