B - Operations – Transporting – 23 – P
Patent
B - Operations, Transporting
23
P
26/25
B23P 11/00 (2006.01) B21D 39/06 (2006.01) B21D 39/20 (2006.01) B23P 15/00 (2006.01) B23P 19/00 (2006.01)
Patent
CA 1176040
ABSTRACT OF THE DISCLOSURE A tube is inserted in a bore in a tube sheet, the tube having an outside diameter slightly smaller than the bore. Hydraulic pressure is applied to the tube internally to expand it radially throughout a pressure zone that extends at least up to one end of the bore. The pressure is confined between two axially spaced seals that encircle a mandrel and are engagable with the inner surface of the tube. The mandrel and seals are then shifted to relocate the pressure zone so that it does not reach the end, and increased pressure is applied to produce a firmer contact between the outside of the tube and the bore. Any crevices between the tube and the tube sheet in which corrosion would be likely to occur are thus eliminated. The invention is particularly suitable for use in connection with the heat exchangers of nuclear plants.
380379
Gowling Lafleur Henderson Llp
Haskel Inc.
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