Reduced resistance skin effect heat generating system

Details Reduced resistance skin effect heat generating system Reduced resistance skin effect heat generating system

1985-03-04

1987-02-24

Bartis, Anthony

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

137341, 138 33, 219 1049R, 219300, 219541, 219553, F16L 5300, H05B 300

Patent

active

046459065

ABSTRACT:
A skin effect heat generating pipe for use with a low frequency alternating current source includes a ferromagnetic pipe (e.g., steel) having thickness substantially greater than the penetration depth of the current of the frequency of the power source. A shunt conductor in the form of an electrically conductive metal layer (e.g., copper) is applied as a discrete layer to the inner surface of the pipe and in electrical contact therewith throughout the length of the shunt conductor, thereby forming a parallel resistance circuit wherein both the shunt conductor and pipe each are capable of conducting substantial current. One end of the pipe is electrically connectable to a first terminal of the power source. A return conductor installed in the pipe and electrically insulated therefrom has one end electrically connected to the second end of the pipe and its other end electrically connectable to the other terminal of the power source. The return conductor can be formed as a discrete inner liner conformed to the inner surface of the layer forming the shunt conductor. The shunt conductor allows a lower voltage level for a given pipe length or a longer pipe length for a given voltage level at the same power output levels.

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"Electric Pipe Line Heating-Skin Effect Current Tracing", 5/3/73, Ric-Wil Incorporated, Brecksville, Ohio 44141.
"SECT System", by Chisso Engineering Co. Ltd., Sect. Dept.
"Selectra Pipeline Heating Systems", Bulletin No. SE 1815M, 1980, TPCO Inc., Monmouth Junction, New Jersey.
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"CRC Handbook of Chemistry and Physics", (56th Ed., 1975) p. E-120.
"Thermon Electric Tracing Products", Form S-210, 11/1985, Thermon Manufacturing Co., San Marcos, Texas.

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