MULTI-WALLED, PRESSURE RESISTING PIPE AND A METHOD FOR THE MANUFACTURE THEREOF

摘要

1480759 Multiwalled metal pipe USUI INTERNATIONAL INDUSTRY Ltd 6 Dec 1974 [17 June 1974] 52948/74 Heading F2P [Also in Division B3] A pressure resisting pipe is produced by telescopically assembling three or more metallic pipe members 4, 5, 6 so that the wall thicknesses 1, 2, 3 of the pipe members decrease from the outermost member towards the innermost member and cold drawing the thus telescoped pipe members to compress them radially and bring respective pipe members into intimate metallic contact with one another.