ELEMENT COMPRISING COAXIAL PIPES AND PRODUCTION METHOD THEREOF

摘要

The element has an inner pipe (1b) and an outer pipe (1a) with an annular space (1d) filled with insulation material. Forged revolution junction parts have outer and inner branches, respectively. The branches are directly welded at an end of the inner and outer pipes with circular welding cords, respectively, where holes of the cords are arranged on external side of the pipes. The inner branch has large length with respect to the outer branch in an axial longitudinal direction of the element. An independent claim is also included for producing an element comprising coaxial pipes.