Pipe double envelope provided with an interior tube cemented, having for its object the assembly of the interior tube cemented in the double casing, without resorting to a method for boring

摘要

The present invention relates to a pipe jacket according to u.s. pat. no. 1502434 provided with an inner tube case-hardened, having for its object the assembly of the inner tube of cemented in the double casing, without resorting to a process for welding in order to preserve the index of the hardness of the cemented pipe is characterized by: an inner tube of cemented (a), a flange (d), common to the two tubes at each end (e) of the pipe, an outer tube (i) which is welded to the front of the two flanges, so that the chambers (j), consisting of the two tubes and of the separator elements are hermetically sealed.