FREMGANGSMAATE FOR AA ERSTATTE ROER I EN ROERSAMLETANK ELLER EN TROMMEL.

摘要

In a method for replacing tubes in a drum or header, without removing the whole tube entirely, the old tube (12) is cut off level with the header-member (14); a recess coterminous with the diameter of the tube (12) is machined into the header creating a seat for a new tube (16); the recessed old tube end (12) is beveled (17) and the old tube (12) is welded (18) into the header-member along the bevel. A new tube (16) is then inserted into the seat and welded (24) to the exterior of the header-member (14). A countersink (20) can be machined in the surface of the header-member to create a greater surface for welding of the new tube (16).