CA1226901A - Electromagnetic inspection system for ferromagnetic tubes - Google Patents
Electromagnetic inspection system for ferromagnetic tubesInfo
- Publication number
- CA1226901A CA1226901A CA000469934A CA469934A CA1226901A CA 1226901 A CA1226901 A CA 1226901A CA 000469934 A CA000469934 A CA 000469934A CA 469934 A CA469934 A CA 469934A CA 1226901 A CA1226901 A CA 1226901A
- Authority
- CA
- Canada
- Prior art keywords
- tube
- set forth
- magnetic field
- wall
- solenoid coil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9013—Arrangements for scanning
- G01N27/902—Arrangements for scanning by moving the sensors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9046—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents by analysing electrical signals
Abstract
ELECTROMAGNETIC INSPECTION SYSTEM FOR
FERROMAGNETIC TUBES
ABSTRACT OF THE DISCLOSURE
An electromagnetic inspection system for detecting, in-situ, the location and character of flaws in a relatively long, thick-walled small bore tube of a heat exchanger wherein a resultant magnetic field is induced in the wall of the tube of selected direction and magnitude by the vector addition of the magnetic fields produced by two magnetic field generators, at least one of which is carried by a scanner for travers-ing the tube and having an array of sensors mounted in close proximity to the wall of the tube generating a unique signal as the scanner passes a flaw in the tube.
FERROMAGNETIC TUBES
ABSTRACT OF THE DISCLOSURE
An electromagnetic inspection system for detecting, in-situ, the location and character of flaws in a relatively long, thick-walled small bore tube of a heat exchanger wherein a resultant magnetic field is induced in the wall of the tube of selected direction and magnitude by the vector addition of the magnetic fields produced by two magnetic field generators, at least one of which is carried by a scanner for travers-ing the tube and having an array of sensors mounted in close proximity to the wall of the tube generating a unique signal as the scanner passes a flaw in the tube.
Description
- 1 - Case 4221 ELECTROMAGNETIC INSPECTION SYSTEM FOR
Ferromagnetic TUBES
This invention relates to an inspection system for determining the integr~y of ferromagnetic tubes. More particularly this invention relates to an inspection system for locating and determining the characteristics of flaws in relatively long, small bore, thick-walled ferromagnetic tubes in vapor generators end other types of heat exchangers.
Before being placed in service and during operation, it is essential that the tubes in such heat exchangers be free of significant abnormalities. It is therefore an established procedure that the tubes be inspected, in-situ, prior to being placed in service end periodically thereafter so that the location and characteristics of such abnormalities, of any, can be determined and a deli-soon made as to the seriousness thereof and the eureka-tire colon to be taken.
Typically, the ions inspection of tube in a 20 vapor generator and in other types of heat exehan~ers must be made from the bore of eke tube as support mom-biers such as support plates, tube sheets, headers and the like, prohibit the inspection being made from the exterior of the tube.
Ferromagnetic TUBES
This invention relates to an inspection system for determining the integr~y of ferromagnetic tubes. More particularly this invention relates to an inspection system for locating and determining the characteristics of flaws in relatively long, small bore, thick-walled ferromagnetic tubes in vapor generators end other types of heat exchangers.
Before being placed in service and during operation, it is essential that the tubes in such heat exchangers be free of significant abnormalities. It is therefore an established procedure that the tubes be inspected, in-situ, prior to being placed in service end periodically thereafter so that the location and characteristics of such abnormalities, of any, can be determined and a deli-soon made as to the seriousness thereof and the eureka-tire colon to be taken.
Typically, the ions inspection of tube in a 20 vapor generator and in other types of heat exehan~ers must be made from the bore of eke tube as support mom-biers such as support plates, tube sheets, headers and the like, prohibit the inspection being made from the exterior of the tube.
- 2 S U~lARY OF TO E I VENT I Owe With the foregoing in mind, it is an object of this invention to provide an electromagnetic inspection system which will, in-situ, locate and determine the characteristics of flaws in heat exchanger tubes.
A further object of this invention is to provide such a system wherein there is induced into the wall of the tube a resultant magnetic field of predetermined direction and magnitude generated by the vector addition of two magnetic fields angularly displaced one from the other.
Still another object of this invention is -to provide such an inspection system wherein a rotating helical magnetic field is induced into the wall of the tubing A further object of this invention is to provide such a system wherein the system apparatus is located entirely within the bore of the heat exchanger tube.
Another object of this invention is to provide such an inspection system adapted to determine the location of and the characteristic of flaws in relatively long, small bore, thic~-walled heat exchanger tubes wherein the cross sectional area of the tube wall is greater than the cross-sectional area of toe bore of the tube.
The invention provides an apparatus for inspecting, in-situ, a heat exchanger tube, comprising, means inducing into the wall of a tube a resultant magnetic field produced by the vectorial addition of a first and a second magnetic field, comprising, a scanner for traversing the tube having a hollow cylindrical body, a first solenoid coil carried by said body in close proximity to the wall of the tube, a first electrical source energizing said solenoid coil to generate said first magnetic field, a second means to generate said suckered magnetic field and an array of sensors disposed between said solenoid coil and the wall of said tube generating output signals responsive to the leakage flux produced by a flaw in the wall of the tube.
The invention will be more fully understood by reference to the following description when considered in connection with the drawings, in which:
IN THE DRAWINGS
Fig. 1 is a schematic illustration of the inspection system of this invention as applied to the in-situ inspection of a typical relatively long, small bore,
A further object of this invention is to provide such a system wherein there is induced into the wall of the tube a resultant magnetic field of predetermined direction and magnitude generated by the vector addition of two magnetic fields angularly displaced one from the other.
Still another object of this invention is -to provide such an inspection system wherein a rotating helical magnetic field is induced into the wall of the tubing A further object of this invention is to provide such a system wherein the system apparatus is located entirely within the bore of the heat exchanger tube.
Another object of this invention is to provide such an inspection system adapted to determine the location of and the characteristic of flaws in relatively long, small bore, thic~-walled heat exchanger tubes wherein the cross sectional area of the tube wall is greater than the cross-sectional area of toe bore of the tube.
The invention provides an apparatus for inspecting, in-situ, a heat exchanger tube, comprising, means inducing into the wall of a tube a resultant magnetic field produced by the vectorial addition of a first and a second magnetic field, comprising, a scanner for traversing the tube having a hollow cylindrical body, a first solenoid coil carried by said body in close proximity to the wall of the tube, a first electrical source energizing said solenoid coil to generate said first magnetic field, a second means to generate said suckered magnetic field and an array of sensors disposed between said solenoid coil and the wall of said tube generating output signals responsive to the leakage flux produced by a flaw in the wall of the tube.
The invention will be more fully understood by reference to the following description when considered in connection with the drawings, in which:
IN THE DRAWINGS
Fig. 1 is a schematic illustration of the inspection system of this invention as applied to the in-situ inspection of a typical relatively long, small bore,
- 3 thick-walled heat exchanger tube.
jig. 2 illustrious a modified form of the invention.
Fig. 3 is cross-~ectional view taken along the line 3-3 of Fig. 2 in the direction of the sorrows.
Fig. 4 illustrates a further modified form of the invention.
Figs. PA, 5B, and 5C are elementary one-line die-grams of typical circuits which Jay be employed in the inspection system of this invention.
DETAILED DESCRIPTION
Referring now to the drawings wherein like refer-once characters designate like or corresponding warts throughout the several views, there is shown a fragment of a typical relatively long, small bore, thick-walled heat exchanger tube 1 which is held in fixed position by means such as support plates 2. Shown within the bore of the tube 1 is a scanner generally indicated at
jig. 2 illustrious a modified form of the invention.
Fig. 3 is cross-~ectional view taken along the line 3-3 of Fig. 2 in the direction of the sorrows.
Fig. 4 illustrates a further modified form of the invention.
Figs. PA, 5B, and 5C are elementary one-line die-grams of typical circuits which Jay be employed in the inspection system of this invention.
DETAILED DESCRIPTION
Referring now to the drawings wherein like refer-once characters designate like or corresponding warts throughout the several views, there is shown a fragment of a typical relatively long, small bore, thick-walled heat exchanger tube 1 which is held in fixed position by means such as support plates 2. Shown within the bore of the tube 1 is a scanner generally indicated at
4 adapted to be drawn through the tube 1. Various en-rangements are known for drawing a scanner through a tube, one such arrangement adapted is the scanning of tubes in vapor generator it illustrated and described in U . S . Patent No . 4 ,172, 492 .
I The scanner 4 is provided with a central cylinder-eel hollow core 6 and a rim 8 at either end which serves to guide the scanner 4 when drawn Thor the tube 1.
Wound upon the core 6 is a solenoid winding 10 energized through leads 12 and 14~ When energized, the winding 10 produces a magnetic yield (By) parallel with the long-tudinal axis of eke tube 1.
Centered inn the tube 1 is a rigid conductor 16 energized through leads 18 and 20. When energized, thy - % 2 conductor 16 produces 8 magnetic field By normal to the longitudinal axis of the tube 1. When both the solenoid winding 10 and conductor 16 ore energized, there is induced into the wow of the tube 1 a resultant magnetic field (Be) generated by the vector addition of fields (By) and (B ). The direction, magnitude and characteristics of the resulting magnetic field (Be) can be adjusted as required to meet the exigency of a specific application by adjusting the relative ener~i-rations of the solenoid winding 10 and conductor 16 as hereinafter explained more in detail.
Mounted around the outer circumference of thy solenoid winding 10 in close proximity to the inner wall of the tube 1 is an array of sensors I connected by way of cabled leads 24 to selected read-out devices schema-tidally shown at 26. So long as the tube 1 is free from defects, the resultant magnetic field (Be) will have a constant configuration dependent solely upon the ener~i-I rations of the solenoid winding 10 and conductor 16.
When, however, the scanner 4 traverses a tube defect, the resultant magnetic field (Be) will ye distorted pro-during a leakage flux which it detected by one or more of the sensor 22.
In Figs. 2 and 3, there is shown, respectively, a modified form of the scanner 4 in longitudinal cross-section and us viewed 810ng the line 3-3 of jig. 2 in eke direction of the arrows. In the modified form where is disposed inn the 6c~nner 4 a transverse solenoid coil 28 wound upon a ferromagnetic core 30. The wryness-verse solenoid coil 28, when energized, produces the flux By In Fig. 4, a further modified form of the invent lion it shown wherein the tube 1 is energized through leads I and 20, thus producing the magn~tie flux (Bc3.
I The scanner 4 is provided with a central cylinder-eel hollow core 6 and a rim 8 at either end which serves to guide the scanner 4 when drawn Thor the tube 1.
Wound upon the core 6 is a solenoid winding 10 energized through leads 12 and 14~ When energized, the winding 10 produces a magnetic yield (By) parallel with the long-tudinal axis of eke tube 1.
Centered inn the tube 1 is a rigid conductor 16 energized through leads 18 and 20. When energized, thy - % 2 conductor 16 produces 8 magnetic field By normal to the longitudinal axis of the tube 1. When both the solenoid winding 10 and conductor 16 ore energized, there is induced into the wow of the tube 1 a resultant magnetic field (Be) generated by the vector addition of fields (By) and (B ). The direction, magnitude and characteristics of the resulting magnetic field (Be) can be adjusted as required to meet the exigency of a specific application by adjusting the relative ener~i-rations of the solenoid winding 10 and conductor 16 as hereinafter explained more in detail.
Mounted around the outer circumference of thy solenoid winding 10 in close proximity to the inner wall of the tube 1 is an array of sensors I connected by way of cabled leads 24 to selected read-out devices schema-tidally shown at 26. So long as the tube 1 is free from defects, the resultant magnetic field (Be) will have a constant configuration dependent solely upon the ener~i-I rations of the solenoid winding 10 and conductor 16.
When, however, the scanner 4 traverses a tube defect, the resultant magnetic field (Be) will ye distorted pro-during a leakage flux which it detected by one or more of the sensor 22.
In Figs. 2 and 3, there is shown, respectively, a modified form of the scanner 4 in longitudinal cross-section and us viewed 810ng the line 3-3 of jig. 2 in eke direction of the arrows. In the modified form where is disposed inn the 6c~nner 4 a transverse solenoid coil 28 wound upon a ferromagnetic core 30. The wryness-verse solenoid coil 28, when energized, produces the flux By In Fig. 4, a further modified form of the invent lion it shown wherein the tube 1 is energized through leads I and 20, thus producing the magn~tie flux (Bc3.
- 5 The solenoid winding 10 is shown as wound upon a scanner PA surrounding the exterior of the tube 1. The winding 10 when energized through leads 12 and 14 produces the flux (By).
This invention further comprehends means for energizing the solenoid coil 10 and the conductor 16, or the solenoid coil 28, or the tube 1, as the case may be, to generate the resultant flux (Be) having the characteristics required for a particular allocation.
Thus, as shown in Fig. SAY the solenoid coil I product in the flux (By) is energized from a DO source 32 whereas the conductor 16, or the solenoid coil 28, or the tube 1, as the case may be, schematically identified by the block 34 in Figs. 5, is energized by a DO source 36. Variable resistances 38, 4Q provide a means whereby the resultant flux (Be) can be directed through sub Stan-tidally 180, by means of pole reversal switches 42, I
to completely scan the wall of the tube 1 in a direction substantially normal to any tube wall abnormality.
In Fig. 5B, there is shown sun arrangement wherein the coil 10 is energized from the DO source 32, whereas the block 34 is energized from an ARC. source 48 of desired frequency through an amplitude control 25 unit diR~rammat~cally shown at 46. As evident. the coil 14 could be energized with ARC. from source 48 through an amplitude control unit 46 and the block 34 energized from DO source 32.
In Fig. 5C, there is shown an arrangement wherein the coil 10 and block 34 are energized from a pulse, source such as a two-phase source 48, Jo produce a rotating helical resulting flux (By) in the wall of the tube 1. There may be included in the circuits to the coil 10 and block 34, if required, phase shift and amplitude carol units 50 and 52 Jo obtain resultant flux (Be) of desired characteristics.
This invention further comprehends means for energizing the solenoid coil 10 and the conductor 16, or the solenoid coil 28, or the tube 1, as the case may be, to generate the resultant flux (Be) having the characteristics required for a particular allocation.
Thus, as shown in Fig. SAY the solenoid coil I product in the flux (By) is energized from a DO source 32 whereas the conductor 16, or the solenoid coil 28, or the tube 1, as the case may be, schematically identified by the block 34 in Figs. 5, is energized by a DO source 36. Variable resistances 38, 4Q provide a means whereby the resultant flux (Be) can be directed through sub Stan-tidally 180, by means of pole reversal switches 42, I
to completely scan the wall of the tube 1 in a direction substantially normal to any tube wall abnormality.
In Fig. 5B, there is shown sun arrangement wherein the coil 10 is energized from the DO source 32, whereas the block 34 is energized from an ARC. source 48 of desired frequency through an amplitude control 25 unit diR~rammat~cally shown at 46. As evident. the coil 14 could be energized with ARC. from source 48 through an amplitude control unit 46 and the block 34 energized from DO source 32.
In Fig. 5C, there is shown an arrangement wherein the coil 10 and block 34 are energized from a pulse, source such as a two-phase source 48, Jo produce a rotating helical resulting flux (By) in the wall of the tube 1. There may be included in the circuits to the coil 10 and block 34, if required, phase shift and amplitude carol units 50 and 52 Jo obtain resultant flux (Be) of desired characteristics.
Claims (11)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Apparatus for inspecting, in-situ, a heat exchanger tube, comprising, means inducing into the wall of a tube a resultant magnetic field produced by the vectorial addition of a first and a second magnetic field, comprising, a scanner for traversing the tube having hollow cylindrical body, a first solenoid coil carried by said body in close proximity to the wall of the tube, a first electrical source energizing said solenoid coil to generate said first magnetic field, a second means to generate said second magnetic field and an array of sensors disposed between said solenoid coil and the wall of said tube generating output signals responsive to the leakage flux produced by a flaw in the wall of the tube.
2. Apparatus as set forth in claim 1 wherein said second means comprises A conductor and a second electri-cal source energizing said conductor to generate said second magnetic field.
3. Apparatus as set forth in claim 2 wherein said second conductor comprises a second solenoid coil carried by said hollow cylindrical body.
4. Apparatus as set forth in claim 2 wherein said conductor comprises the wall of the tube.
5. Apparatus as set forth in claim 2 wherein said conductor comprises a cylindrical conductor centered within said tube.
6. Apparatus as set forth in claim 2 wherein said first and second sources are out-of-phase alternating current sources to produce a resultant helical rotating magnetic field in the wall of the tube.
7. Apparatus as set forth in claim 2 wherein said first and second sources are direct current sources.
8. Apparatus as set forth in claim 2 wherein one of said sources is a direct current source and the other of said sources is an alternating current source.
9. Apparatus as set forth in claim 3 wherein said second solenoid coil is disposed within said hollow cylindrical body perpendicular to said first solenoid coil.
10. Apparatus as set forth in claim 1 wherein said cylindrical body is provided with an outwardly protruding rim at either end extending beyond said array of sensors to guide said scanner when scanning the tube from the bore of the tube.
11. Apparatus as set forth in claim 1 wherein said cylindrical body is provided with an inwardly protruding rim at either end extending beyond said array of sensors to guide said scanner when scanning the tube from the exterior of the tube.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/566,020 US4649343A (en) | 1983-12-27 | 1983-12-27 | Electromagnetic flux leakage inspection system for ferromagnetic tubes |
| US566,020 | 1983-12-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1226901A true CA1226901A (en) | 1987-09-15 |
Family
ID=24261120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000469934A Expired CA1226901A (en) | 1983-12-27 | 1984-12-12 | Electromagnetic inspection system for ferromagnetic tubes |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US4649343A (en) |
| EP (1) | EP0152687A1 (en) |
| JP (1) | JPS60157046A (en) |
| KR (1) | KR870002113B1 (en) |
| AU (1) | AU3717584A (en) |
| CA (1) | CA1226901A (en) |
| DK (1) | DK590384A (en) |
| IE (1) | IE55814B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5237270A (en) * | 1990-10-11 | 1993-08-17 | Atomic Energy Of Canada Limited | Ferromagnetic eddy current probe having eccentric magnetization for detecting anomalies in a tube |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4563216A (en) * | 1984-06-15 | 1986-01-07 | Amchem Products, Inc. | Compositions and processes for coating ferrous surfaces with copper |
| KR890001536B1 (en) * | 1984-11-23 | 1989-05-06 | 더 뱁콕 앤드 윌콕스 컴퍼니 | Diametrically offsetting eddy current probe |
| DE3511076A1 (en) * | 1985-03-27 | 1986-10-09 | Kopp AG International Pipeline Services, 4450 Lingen | MOLCH FOR ELECTROMAGNETIC TESTS ON PIPELINE WALLS OF STEEL AND METHOD THEREFOR |
| JPH073408B2 (en) * | 1985-03-29 | 1995-01-18 | 日本鋼管株式会社 | Pipeline pitting detector |
| CH667727A5 (en) * | 1985-05-28 | 1988-10-31 | Zellweger Uster Ag | MEASURING HEAD FOR INDUCTIVE MEASUREMENT OF THE THICKNESS OF AN INSULATING LAYER ON AN ELECTRIC CONDUCTOR. |
| JPS62155367U (en) * | 1986-03-25 | 1987-10-02 | ||
| US4808927A (en) * | 1987-02-19 | 1989-02-28 | Atomic Energy Of Canada Limited | Circumferentially compensating eddy current probe with alternately polarized receiver coil |
| CH676526A5 (en) * | 1988-05-30 | 1991-01-31 | Asea Brown Boveri | |
| CA2088749C (en) * | 1992-02-05 | 2003-07-08 | Wilhelmus Hendrikus Van Den Berg | Apparatus and method for pipe or tube inspection |
| US5315234A (en) * | 1992-04-03 | 1994-05-24 | General Electric Company | Eddy current device for inspecting a component having a flexible support with a plural sensor array |
| US5442286A (en) * | 1993-09-22 | 1995-08-15 | General Electric Company | Eddy current array inspection device |
| US5479100A (en) * | 1994-05-10 | 1995-12-26 | Gas Research Institute | Method for detecting anomalies in pipes |
| US5537035A (en) * | 1994-05-10 | 1996-07-16 | Gas Research Institute | Apparatus and method for detecting anomalies in ferrous pipe structures |
| DE19929072A1 (en) | 1999-06-25 | 2000-12-28 | Pii Pipetronix Gmbh | Device for testing pipelines made of ferromagnetic materials |
| US7295004B2 (en) * | 2006-03-03 | 2007-11-13 | Gary Kroner | Eddy current probe and method of manufacture thereof |
| US20090160437A1 (en) * | 2007-12-21 | 2009-06-25 | Carbon Steel Inspection, Inc. | Eddy Current Probe And Method Of Manufacture Thereof |
| JP5946086B2 (en) | 2012-03-19 | 2016-07-05 | 株式会社日立製作所 | Eddy current inspection device, eddy current inspection probe, and eddy current inspection method |
| US9995799B2 (en) * | 2015-07-14 | 2018-06-12 | The Boeing Company | System and method for magnetic characterization of induction heating wires |
| WO2023049975A1 (en) | 2021-10-01 | 2023-04-06 | Pipeway Engenharia Ltda | Internal duct integrity inspection equipment using magnetic metal memory |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2995701A (en) * | 1959-01-06 | 1961-08-08 | Tuboscope Company | Electromagnetic inspection of pipe |
| US3056920A (en) * | 1959-07-15 | 1962-10-02 | Schlumberger Well Surv Corp | Systems for inspecting material |
| US3284701A (en) * | 1962-09-28 | 1966-11-08 | Camco Inc | Magnetic testing apparatus for measuring internal diameter and surface variations in wall casing |
| US3597678A (en) * | 1968-12-24 | 1971-08-03 | Williams Brothers Co | Apparatus for sensing thickness variations, discontinuities, and the like in elongated steel structures by measuring variations in magnetic properties utilizing a flux gate |
| US3593122A (en) * | 1969-03-27 | 1971-07-13 | Amf Inc | Method and apparatus for identifying hardspots in magnetizable material |
| US3913009A (en) * | 1974-03-12 | 1975-10-14 | Vladimir Vasilievich Panasjuk | Method of inspecting powder-cored electrodes and device for effecting said method |
| GB1586581A (en) * | 1977-01-26 | 1981-03-18 | British Gas Corp | Pipeline inspection equipment |
| US4172492A (en) * | 1977-10-13 | 1979-10-30 | The Babcock & Wilcox Company | Apparatus for the in situ inspection of tubes while submerged in a liquid |
| JPS5722552A (en) * | 1980-07-17 | 1982-02-05 | Shimadzu Corp | Method for detecting flaw by using magnetic powder |
| US4477776A (en) * | 1981-11-02 | 1984-10-16 | Magnetic Analysis Corporation | Apparatus and process for flux leakage testing using transverse and vectored magnetization |
-
1983
- 1983-12-27 US US06/566,020 patent/US4649343A/en not_active Expired - Fee Related
-
1984
- 1984-11-21 IE IE2983/84A patent/IE55814B1/en unknown
- 1984-12-04 EP EP84308410A patent/EP0152687A1/en not_active Withdrawn
- 1984-12-10 DK DK590384A patent/DK590384A/en not_active Application Discontinuation
- 1984-12-12 KR KR1019840007877A patent/KR870002113B1/en active IP Right Grant
- 1984-12-12 CA CA000469934A patent/CA1226901A/en not_active Expired
- 1984-12-24 AU AU37175/84A patent/AU3717584A/en not_active Abandoned
- 1984-12-26 JP JP59273510A patent/JPS60157046A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5237270A (en) * | 1990-10-11 | 1993-08-17 | Atomic Energy Of Canada Limited | Ferromagnetic eddy current probe having eccentric magnetization for detecting anomalies in a tube |
Also Published As
| Publication number | Publication date |
|---|---|
| DK590384D0 (en) | 1984-12-10 |
| KR870002113B1 (en) | 1987-12-08 |
| JPS60157046A (en) | 1985-08-17 |
| KR850004640A (en) | 1985-07-25 |
| US4649343A (en) | 1987-03-10 |
| IE55814B1 (en) | 1991-01-16 |
| IE842983L (en) | 1985-06-27 |
| DK590384A (en) | 1985-06-28 |
| AU3717584A (en) | 1985-07-04 |
| EP0152687A1 (en) | 1985-08-28 |
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