DOUBLE ENVELOPE PIPE HAVING A CEMENTITIOUS INTERNAL TUBE, FOR THE PURPOSE OF ASSEMBLING THE INTERNAL CEMENTING TUBE INTO THE DOUBLE ENVELOPE PIPE, WITHOUT APPLYING A SURVEY METHOD

摘要

The invention relates to a double-walled pipe according to Patent No. 1502434 having a cemented inner tube, the purpose of which is to assemble the cemented inner tube in the double-walled pipe, without resorting to a process for welding purposes. to preserve the index of hardness of the cemented pipe characterized by: A cemented inner pipe (a), A flange (d) common to the two tubes at each end (e) of the pipe, an outer tube (i) being welded in line with the two flanges so that the chambers (j) constituted by the two tubes and the separating elements are hermetic.