DOUBLE WALL LARGE PIPE, USE AND PROCEDURE FOR MANUFACTURING A DOUBLE WALL LARGE PIPE

摘要

Double-walled large pipe (10) with at least one spiral welded steel pipe as the inner tube (12) and / or the outer tube (14), wherein the spiral a welded steel pipe of a thick-walled hot-rolled steel strip (16), i.e, a hot rolled steel strip (16) having a thickness greater than 8,0 mm, spiral welded tube is, characterized in that the inner tube (12) and the outer tube (14) via a plurality of welded joints provided at different axial heights (18) connected to one another and for the welded connections (18) sweat openings (22) in the inner tube (12) are provided.