EP0038655A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improvements in pipe induction heating
Assignee: Pipeline Induction Heat Ltd
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Filing: 1981-04-10
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Granted: —
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Expires: 2001-04-10
Abstract
Abstract Apparatus is disclosed for induction heating of metallic pipelines either in a weld area to effect a heat treatment or a pre-fusion coating temperature increase, at a pipe end or along the whole length of the pipe in order to effect drying. Apparatus for pre-coating temperature increase comprises a frame 10 whose essentially semi-circular cross-section members 11 and 12 are each made up of aluminium end plates 13, 14,15 and 16. Aluminium box-section cross members secure the end plates together and mounted to the radially inner surfaces of these cross members are aluminium strip conductors 48 and 49 which in use clear the surface of a pipeline about which the apparatus is received. In operation, primary current passing through the ribbon-like conductors induces a secondary heat-generating current in the pipeline raising its temperature to as high as 750°C when using an electrical supply of 180 volts, 2500 amps and nominal frequency of 3500 hertz. The induction heater can be placed overthe pipeline or removed from it by hinging apart of the two frame members 11 and 12 at a jaw of the apparatus.
Inventors
- 👤 Peter J. Bryant
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 14:03
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/10; H05B6/101; F; F16; F16L; F16L55/00
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
73 words
An induction heating apparatus for use in heating a metallic pipe length in a circumferential or part-circumferential band which apparatus comprises a ribbon-like conductor and means carrying said conductor and receivable in contact with the pipe so as in use to dispose the conductor in such juxtaposed spaced relationship with the pipe surface in said band that primary current passing through said conductor in use induces a heat-generating secondary current in the pipe.
Claim 2
Dependent Claim
73 words
An induction heating apparatus for use in heating a metallic pipe length in a circumferential or part-circumferential band which apparatus comprises a ribbon-like conductor and means carrying said conductor and receivable in contact with the pipe so as in use to dispose the conductor in such juxtaposed spaced relationship with the pipe surface in said band that primary current passing through said conductor in use induces a heat-generating secondary current in the pipe.
Claim 3
Dependent Claim
38 words
An apparatus as claimed in Claim 1 wherein the conductor is so dimensioned and configured as in use to be juxtaposed with respect to substantially all of the circumferential extent of a circumferential surface band of the pipe.
Claim 4
Dependent Claim
48 words
An apparatus as claimed in Claim 1 or Claim 2 wherein said conductor is such as in use to define substantially the circumference of a circular plane which, with the apparatus in use received about a circular cross-sectioned pipe length, intersects diametrically the cross- section of said pipe.
Claim 5
Dependent Claim
42 words
An apparatus as claimed in Claim 4 or Claim 5 wherein said conductors include at least one conductor whose dimension in the longitudinal direction of the pipe length differs from that of the other or at least one other of said conductors.
Claim 6
Independent Claim
70 words
An apparatus as claimed in any one of Claims 4 to 6 and including a first group of said conductors each defining the circumferential extremeties of separate, spaced essentially circular parallel planes and a second group of conductors substantially identical in form and relationship with the first group with the two groups being spaced one from another by a spacing greater than that between the respective conductors of each group.
Claim 7
Dependent Claim
47 words
An apparatus as claimed in Claim 7 wherein each group consists of a pair of conductors, the conductor of each group closest the other group of conductors having a dimension in the longitudinal direction of the pipe length smaller than the corresponding dimension of its paired conductor.
Claim 8
Dependent Claim
139 words
An induction heating apparatus for use in heating a metallic pipe length of generally circular cross-section in a circumferential band which apparatus comprises a frame having two frame members together defining a pipe-receiving opening and hinged together so as to define a jaw which is openable by pivotable movement at the hinge to admit the pipe to said opening, and a plurality of strip- form electrical conductors carried by the frame so as to be in inductive proximity to the pipe surface in use of the apparatus, said conductors in the closed position of the jaw each defining the circumference of a generally circular plane which intersects diametrically the cross-section of a pipe length received by said frame in use and said conductors being spaced apart along the pipe axis with electrical connection means being provided at the jaw.
Claim 9
Dependent Claim
139 words
An induction heating apparatus for use in heating a metallic pipe length of generally circular cross-section in a circumferential band which apparatus comprises a frame having two frame members together defining a pipe-receiving opening and hinged together so as to define a jaw which is openable by pivotable movement at the hinge to admit the pipe to said opening, and a plurality of strip- form electrical conductors carried by the frame so as to be in inductive proximity to the pipe surface in use of the apparatus, said conductors in the closed position of the jaw each defining the circumference of a generally circular plane which intersects diametrically the cross-section of a pipe length received by said frame in use and said conductors being spaced apart along the pipe axis with electrical connection means being provided at the jaw.
Claim 10
Independent Claim
45 words
A method of drying a damp or wet metallic pipe surface which method comprises disposing in inductive proximity to said surface one or more ribbon-like conductors so arranged as to define an opening for the pipe and conducting a high frequency current through said conductor.
Claim 11
Independent Claim
45 words
A method of drying a damp or wet metallic pipe surface which method comprises disposing in inductive proximity to said surface one or more ribbon-like conductors so arranged as to define an opening for the pipe and conducting a high frequency current through said conductor.
Claim 12
Independent Claim
46 words
A method for pre-heating a metallic pipe surface prior to fusion coating which method comprises disposing in inductive proximity to said surface one or more ribbon-like conductors so arranged as to define an opening for the pipe and conducting a high frequency current through said conductor.
Claim 13
Independent Claim
46 words
A method for pre-heating a metallic pipe surface prior to fusion coating which method comprises disposing in inductive proximity to said surface one or more ribbon-like conductors so arranged as to define an opening for the pipe and conducting a high frequency current through said conductor.
Claim 14
Dependent Claim
77 words
An induction heating apparatus for heating the axial termini of two metallic pipe lengths in a circumferential or part-circumferential band prior to completion of a multi-stage welding operation to weld said lengths axially together, which apparatus comprises a conductor and a carrier for carrying said conductor in such disposition that in use the conductor is arranged in inductive proximity with respect to the pipe surface, the apparatus including means for dissipating heat from the conductor in use.
Claim 15
Dependent Claim
77 words
An induction heating apparatus for heating the axial termini of two metallic pipe lengths in a circumferential or part-circumferential band prior to completion of a multi-stage welding operation to weld said lengths axially together, which apparatus comprises a conductor and a carrier for carrying said conductor in such disposition that in use the conductor is arranged in inductive proximity with respect to the pipe surface, the apparatus including means for dissipating heat from the conductor in use.
Claim 16
Dependent Claim
40 words
A pipe end heater comprising an induction heat element in the form of one or more electrically conductive members so sized and configured as to be receivable in juxtaposed spaced relationship with the pipe surface at an open end thereof.
Claim 17
Dependent Claim
40 words
A pipe end heater comprising an induction heat element in the form of one or more electrically conductive members so sized and configured as to be receivable in juxtaposed spaced relationship with the pipe surface at an open end thereof.
Claim 18
Dependent Claim
49 words
A pipe end heater comprising at least one metallic conductor formed into a part-circular member receivable over or within an end of a pipe of predetermined diameter so as to be spaced from its external or internal circumferential surface in juxtaposed relationship therewith over substantially all of said surface.
Claim 19
Dependent Claim
49 words
A pipe end heater comprising at least one metallic conductor formed into a part-circular member receivable over or within an end of a pipe of predetermined diameter so as to be spaced from its external or internal circumferential surface in juxtaposed relationship therewith over substantially all of said surface.
Claim 20
Dependent Claim
62 words
A pipe end heater comprising means defining a hollow pipe-receiving cylindrical member, at least one conductor element mounted to the interior cylindrical surface of the member so as to be juxtaposed in spaced relationship with the pipe surface when a pipe is received in said member and means engageable with the surface of a pipe so received to maintain said spaced relationship.
Claim 21
Dependent Claim
62 words
A pipe end heater comprising means defining a hollow pipe-receiving cylindrical member, at least one conductor element mounted to the interior cylindrical surface of the member so as to be juxtaposed in spaced relationship with the pipe surface when a pipe is received in said member and means engageable with the surface of a pipe so received to maintain said spaced relationship.
Claim 22
Dependent Claim
41 words
A pipe end heater as claimed in claim 36 wherein a plurality of members axially extending with respect to the pipe are spaced apart on the circumference of a cylindrical pipe-receiving cavity and carry said conductors mounted thereto within said cavity.
References Cited (Backward Citations)
No citation records indexed.
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