a method is disclosed for securing a repair sleeve within a tubular fluid conveying conduit . the sleeve is positioned within the tube so that it extends coextensive with a region of degraded tube wall and partially beyond the axial extremes of the degraded area . a radially outwardly directed force is then applied toa the tubular sleeve from within along a portion of the sleeve at each end , extending beyond the degraded area . the force is sufficient to cause outward plastic deformation of both the sleeve and the tube resulting in an interference mechanical joint therebetween .