Sleeve insertion

Details Sleeve insertion Sleeve insertion

B - Operations, Transporting

21

D

153/33

B21D 3/02 (2006.01) B21D 3/05 (2006.01) B23P 19/02 (2006.01) F16L 55/00 (2006.01) F22B 37/10 (2006.01)

Patent

CA 1257187

14 ABSTRACT OF THE DISCLOSURE The hollow tubular member or blank which is to serve as a sleeve for a corroded tube of the steam gener- ator of a nuclear reactor plant and which is too long to be manipulated under the tube sheet of the reactor, is prebent into a shape such that it can be manipulated and is then progressively straightened under the tube sheet as it is progressively inserted into the tube. The straight- ener includes a plurality of grooved rolls mounted stag- gered and rotatable in a train. Each roll forms a channel engaging half of the periphery of the member. The contour of the engaging surface of each roll is the same as the contour of the member over half of its peripheral surface so that each roll mates with the member over half of its peripheral surface. The rolls are in frictional engagement with the member and advance the member while bending it so that the material of the member is stressed beyond its elastic limit oppositely to the stress beyond the elastic limit, which produced the bending, sufficiently to straighten the hollow member.

460113

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