Method and means for segmentally reducing heat output in a heat-tracing pipe

Abstract From the Canadian patent

This invention relates to an improvement in a heatgenerating pipe made up of a ferromagnetic pipe having an insulated conductor extending 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 conductor 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 …