US3632976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential and/or discontinuous heating along pipelines by heat-generating pipes utilizing skin-effect current
Assignee: JNC Corp
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Filing: 1969-06-16
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Granted: 1972-01-04
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Expires: 1989-06-16
Abstract
Abstract Heating a pipeline by means of at least one ferromagnetic heatgenerating pipe wherein an electric conductor is disposed along the interior length of said ferromagnetic pipe but is insulated from the inner wall thereof so that upon passage of alternating voltage through said electric conductor there is a concentrated flow of current along the inner skin of the ferromagnetic pipe to thereby generate heat in said ferromagnetic pipe, said heat being transferred to said pipeline by conduction, and controlling the amount of heat conducted to various sections of said pipeline by varying the placement density of said ferromagnetic pipe along various sections of said pipeline.
Inventors
- 👤 Masao Ando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:34
CPC Classifications
E; E21; E21B; E21B36/00; E21B36/04; F; F16; F16L; F16L53/00; F16L53/30; F16L53/34
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
276 words
A method for electrically heating a fluid-transporting pipeline that is composed of a plurality of sequentially disposed pipeline sections, each pipeline section having different heat requirements depending upon the amount of fluid flowing therethrough and the heat loss therefrom, said method comprising: a. sequentially disposing a plurality of ferromagnetic pipes in a heat transmitting relationship with said sequentially disposed pipeline sections, b. selecting the length of each ferromagnetic pipe that is associated with each pipeline section so that its length is directly proportional to the heat requirements of that pipeline section to thus produce a fluid-transporting pipeline having an unbroken sequence of pipeline sections and a discontinuous sequence of ferromagnetic pipes associated therewith, c. electrically connecting said discontinuous sequence of ferromagnetic pipes in series, d. passing an electrical conductor through the interior of said discontinuous sequence of ferromagnetic pipes but electrically insulating said electrical conductor from the interior of said discontinuous sequence of ferromagnetic pipes, e. connecting one end of said electrical conductor to the outer extremity of the last in a discontinuous sequence of ferromagnetic pipes, f. connecting the other end of said electrical conductor to an AC power source, g. also connecting said AC power source to the first of the ferromagnetic pipes in said discontinuous sequence of ferromagnetic pipes, h. arranging the AC source frequency and the thickness of the ferromagnetic pipe so that the AC source current flowing in the pipe wall will be concentrated by the AC skin effect into the interior surface regions of the walls of the discontinuous sequence of ferromagnetic pipes to thereby generate Joulean heat in each sequentially disposed pipeline section in accordance with its heat requirements.
Claim 2
Independent Claim
276 words
A method for electrically heating a fluid-transporting pipeline that is composed of a plurality of sequentially disposed pipeline sections, each pipeline section having different heat requirements depending upon the amount of fluid flowing therethrough and the heat loss therefrom, said method comprising: a. sequentially disposing a plurality of ferromagnetic pipes in a heat transmitting relationship with said sequentially disposed pipeline sections, b. selecting the length of each ferromagnetic pipe that is associated with each pipeline section so that its length is directly proportional to the heat requirements of that pipeline section to thus produce a fluid-transporting pipeline having an unbroken sequence of pipeline sections and a discontinuous sequence of ferromagnetic pipes associated therewith, c. electrically connecting said discontinuous sequence of ferromagnetic pipes in series, d. passing an electrical conductor through the interior of said discontinuous sequence of ferromagnetic pipes but electrically insulating said electrical conductor from the interior of said discontinuous sequence of ferromagnetic pipes, e. connecting one end of said electrical conductor to the outer extremity of the last in a discontinuous sequence of ferromagnetic pipes, f. connecting the other end of said electrical conductor to an AC power source, g. also connecting said AC power source to the first of the ferromagnetic pipes in said discontinuous sequence of ferromagnetic pipes, h. arranging the AC source frequency and the thickness of the ferromagnetic pipe so that the AC source current flowing in the pipe wall will be concentrated by the AC skin effect into the interior surface regions of the walls of the discontinuous sequence of ferromagnetic pipes to thereby generate Joulean heat in each sequentially disposed pipeline section in accordance with its heat requirements.
Claim 3
Dependent Claim
278 words
A fluid-transporting pipeline provided with electrical heating means whicH is characterized by: a. a plurality of sequentially disposed pipeline sections, each pipeline section having different heat requirements depending upon the amounts of fluid flowing therethrough and the heat loss therefrom, b. a plurality of sequentially disposed ferromagnetic pipes associated with said sequentially disposed pipeline sections and in heat-transmitting relation therewith, c. said plurality of sequentially disposed ferromagnetic pipes being connected together electrically in series, d. the total length of a ferromagnetic pipe that is associated with each pipeline section being directly proportional to the heat requirements of that pipeline section which results in a fluid-transporting pipeline having an unbroken sequence of ferromagnetic pipes associated therewith, e. an electrical conductor extending through said discontinuous sequence of said ferromagnetic pipes, f. said electrical conductor passing through the interior of a discontinuous sequence of ferromagnetic pipes but being electrically insulated from the interior of said discontinuous sequence of ferromagnetic pipes, g. said electrical conductor having one end thereof electrically connected to the outer extremity of the last in a discontinuous sequence of ferromagnetic pipes and the other end thereof connected to an AC power source, h. said AC power source also being electrically connected to the first ferromagnetic pipe in said discontinuous sequence of ferromagnetic pipes, i. the AC source frequency and the wall thickness of the ferromagnetic pipe being such that the AC source current flowing in the pipe wall will be concentrated by the AC skin effect into the interior surface regions of the walls of the discontinuous sequence of ferromagnetic pipes to thereby generate Joulean heat in each sequentially disposed pipeline section in accordance with its heat requirements.
Claim 4
Dependent Claim
278 words
A fluid-transporting pipeline provided with electrical heating means whicH is characterized by: a. a plurality of sequentially disposed pipeline sections, each pipeline section having different heat requirements depending upon the amounts of fluid flowing therethrough and the heat loss therefrom, b. a plurality of sequentially disposed ferromagnetic pipes associated with said sequentially disposed pipeline sections and in heat-transmitting relation therewith, c. said plurality of sequentially disposed ferromagnetic pipes being connected together electrically in series, d. the total length of a ferromagnetic pipe that is associated with each pipeline section being directly proportional to the heat requirements of that pipeline section which results in a fluid-transporting pipeline having an unbroken sequence of ferromagnetic pipes associated therewith, e. an electrical conductor extending through said discontinuous sequence of said ferromagnetic pipes, f. said electrical conductor passing through the interior of a discontinuous sequence of ferromagnetic pipes but being electrically insulated from the interior of said discontinuous sequence of ferromagnetic pipes, g. said electrical conductor having one end thereof electrically connected to the outer extremity of the last in a discontinuous sequence of ferromagnetic pipes and the other end thereof connected to an AC power source, h. said AC power source also being electrically connected to the first ferromagnetic pipe in said discontinuous sequence of ferromagnetic pipes, i. the AC source frequency and the wall thickness of the ferromagnetic pipe being such that the AC source current flowing in the pipe wall will be concentrated by the AC skin effect into the interior surface regions of the walls of the discontinuous sequence of ferromagnetic pipes to thereby generate Joulean heat in each sequentially disposed pipeline section in accordance with its heat requirements.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |