(57) The invention relates to the repair of heat exchange tubes and is directed at an
explosive activated assembly having a sleeve (14) which is inserted into an end of
the tube (12) to be repaired and has a plurality of projections (18) extending from
the outer surface thereof. A force-transmitting member (20) extends within a bore
(22) formed in the sleeve (14) and contains an explosive member (24) so that, upon
detonation of the explosive member (24), the force-transmitting member (20) and the
sleeve (14) are expanded radially outwardly to drive the projections (18) against
the tube (12).
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