Electric heating – Heating devices – With heater-unit housing – casing – or support means
Patent
1996-03-19
1998-04-07
Hoang, Tu B.
Electric heating
Heating devices
With heater-unit housing, casing, or support means
156 64, 1563042, 285 47, 285 21, 219544, H05B 358
Patent
active
057367159
ABSTRACT:
A joint is formed between two lengths of insulated pipes, which pipes have thermoplastic jackets. The jackets are joined together with a thermoplastic split sleeve. A welding rod arrangement is located along the edges on one side of the sleeve in a U-shaped configuration. The welding rod arrangement includes two side by side welding rods, each of which have a thermoplastic core with resistance wires embedded in the core. The split sleeve is wrapped around the joint with the sleeve overlapping the pipe jackets and also with the ends of the sleeve overlapping to form a longitudinal seam. The welding rod arrangement encircles each jacket in a partial spiral with a nonconductive core of thermoplastic located between the adjacent welding rod arrangements. In addition, the welding rod arrangement extends along the longitudinal seam. Electrical current is provided to the resistance wires, wherein the sleeve is welded to the pipe jackets and the split in the sleeve is welded closed.
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Hoang Tu B.
Mantooth Geoffrey A.
Thermacor Process, Inc.
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