B - Operations – Transporting – 23 – P
Patent
B - Operations, Transporting
23
P
327/76, 26/78
B23P 11/00 (2006.01) B23P 19/00 (2006.01) B29C 65/00 (2006.01) B29C 65/34 (2006.01) B29D 23/00 (2006.01) F16L 47/22 (2006.01) F16L 59/16 (2006.01) F16L 59/20 (2006.01) B29C 65/50 (2006.01)
Patent
CA 1210925
ABSTRACT: For mounting a protective sleeve of plastic over a joint between prefabricated heat insulated pipes, typically subterranean district heating pipes, an axially split plastic sleeve is inserted laterally over the joint so as to bridge the opposed ends of outer protective plastic tubes of the joined pipes. A plastic welding strip as provided with a number of embedded parallel heating wires is placed along and over the relevant annular joint with its opposed ends located spaced from each other adjacent the axial split of the sleeve. The ends of the strip are provided with terminals for parallel connection of the embedded wires, and the wires are electrically heated to weld together the welding strip and the two plastic tube ends. The axial split is then scaled by means of a similar welding strip.
431153
Marks & Clerk
Moller (i.c.) A/s
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