H - Electricity – 05 – B
Patent
H - Electricity
05
B
309/28.1
H05B 3/00 (2006.01) F16L 53/00 (2006.01) H05B 6/10 (2006.01)
Patent
CA 1064561
ABSTRACT OF THE DISCLOSURE METHOD AND MEANS FOR SEGMENTALLY REDUCING HEAT OUTPUT IN A HEAT-TRACING PIPE This invention relates to an improvement in a heat-generating pipe made up of a ferromagnetic pipe having an insulated conductor ex- tending through it to a given point so that both the pipe and conductor may be connected in series with a power source of alternating current. The invention is directed to both a method and means for reducing the heat output over a desired segment of the pipe by reducing the magnetic field created by the alternating current flowing in the insulated con- ductor and that segment of the pipe. The means may be: a second electrical conductor internal and parallel to the heat reduced segment; a segment of nonferromagnetic electrically conductive pipe; an electrically nonconductive pipe extending throughout the desired segment shunted by a second conductor; or a portion of the insulated conductor that is exterior to the ferromagnetic pipe along the segment so that it is magnetically decoupled from the pipe in which a reduced heat output is desired. The method comprises the requisite steps of connecting an electromagnetic field- decreasing means in the series circuit to reduce the alternating magnetic field produced in the pipe by the alternating current flowing through the conductor inside the pipe. - 2 -
237449
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