CA2293500A1 - Method of detecting corrosion in pipelines and the like by comparative pulse propagation analysis - Google Patents
Method of detecting corrosion in pipelines and the like by comparative pulse propagation analysis Download PDFInfo
- Publication number
- CA2293500A1 CA2293500A1 CA002293500A CA2293500A CA2293500A1 CA 2293500 A1 CA2293500 A1 CA 2293500A1 CA 002293500 A CA002293500 A CA 002293500A CA 2293500 A CA2293500 A CA 2293500A CA 2293500 A1 CA2293500 A1 CA 2293500A1
- Authority
- CA
- Canada
- Prior art keywords
- pulses
- wave
- wave form
- far side
- wave forms
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
Abstract
A method of dectecting corrosion on an elongate member (10), such as a pipe (10). Far side and near side electric pulses are transmitted into a magnetically permeable pipe (10) at spaced locations to travel toward one another. These are synchronized to intersect at various locations on the pipe (10). The resulting waveforms are analyzed by combining adjacent waveforms resulting from pulses intersection at spaced locations. Two combined waveforms are analyzed by subtracting one from the other to produce a difference waveform and the difference waveforms are compared to detect corrosion.
Claims (9)
1. A method of identifying corrosion on an electromagnetically permeable elongate member, such as a pipe, said method comprising:
a. transmitting near side and far side electric or electromagnetic pulses (waves)from, respectively, near aide and far side spaced transmitting locations on said elongate member, with said pulses (waves) travelling toward one another to intersect at intersecting locations on said elongate member.
b. receiving said far side pulses as wave forms at a receiving location after intersection with related nearside pulses (waves).
c. synchronizing transmission of the near side and far side pulses (waves) so that the intersections of the near side and far side pulses waves occur at spaced intersecting locations on said elongate member;
d. combining the wave forms of at least two of said far side pulse wave which are spaced from one another to form a composite wave form;
e. ascertaining a variation or variations in said composite wave form as a means of detecting corrosion.
a. transmitting near side and far side electric or electromagnetic pulses (waves)from, respectively, near aide and far side spaced transmitting locations on said elongate member, with said pulses (waves) travelling toward one another to intersect at intersecting locations on said elongate member.
b. receiving said far side pulses as wave forms at a receiving location after intersection with related nearside pulses (waves).
c. synchronizing transmission of the near side and far side pulses (waves) so that the intersections of the near side and far side pulses waves occur at spaced intersecting locations on said elongate member;
d. combining the wave forms of at least two of said far side pulse wave which are spaced from one another to form a composite wave form;
e. ascertaining a variation or variations in said composite wave form as a means of detecting corrosion.
2. The method as recited in Claim 1, wherein one of the wave form of the two wave forms that are to be combined is inverted and then added to the other of the wave forms being combined to create a difference wave form, and variations in said difference wave form are ascertained as a means of detecting corrosion.
3. The method as recited in Claim 2, wherein far side pulses which pass through points of intersection that are adjacent to one another are considered to be sequential far side pulses, with the order of sequence being the same as the order in which the points of intersection are spaced along the elongate member, and combining of the far side wave forms is accomplished in a pattern such that first and second adjacent wave forms are combined to make a first composite wave form, the second wave form and an adjacent third wave form are combined to make a second composite wave form, the third wave form is combined with an adjacent fourth wave form to make a third composite wave form, with the pattern repeating itself with subsequent pairs of wave forms from adjacent far side pulses.
4. The method recited in claim 3, wherein adjacent composite wave forms are compared with one another as a means of detecting corrosion.
5. The method as recited in Claim 4, wherein a reference wave form is established by creating composite wave forms resulting from pulses that intersect away from a corroded areas of the elongate member and identifying composite wave forms that differ from the reference composite wave form in phase shift and/or dispersion and/or amplitude and/or wave distortion.
6. The method as recited in Claim 5, wherein corrosion that is present between two adjacent points of intersection on the elongate member, is detected by examining a composite wave form resulting from combining the difference wave form overlapping the point of intersection with difference wave forms on opposite sides of the overlapping composite wave form.
7. The method as recited in Claim 5,wherein corrosion is present at a point of intersection of two wave forms, and two difference wave forms are derived by combining the wave form at the point of corrosion with adjacent wave forms, and these are compared with one another wave form to ascertain corrosion.
8. The method as recited in Claim 7 wherein two additional difference wave forms that are on opposite sides of, and adjacent to, the two wave forms which are compared to detect the corrosion are also compared with the two difference wave forms which are combined at the point of intersection, as a means of detecting corrosion.
9. The method as recited in Claim 1, wherein a far side pulses which pass through the points of intersection that are adjacent to one another are considered to be sequential far side pulses, with the order of sequence being the same as the order in which the points of intersection are spaced along the elongate member, the combining of the far side wave forms being accomplished in a pattern such that the wave form resulting from the first and second adjacent nearside pulses intersecting with related far side pulses are combined to make a first composite wave form, wave forms of the second and third near side pulses that are combined with the related far side pulses are combined to make composite wave forms, with this pattern repeating itself for subsequent pulses.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US4866097P | 1997-06-04 | 1997-06-04 | |
| US60/048,660 | 1997-06-04 | ||
| PCT/US1998/011683 WO1998055877A1 (en) | 1997-06-04 | 1998-06-04 | Method of detecting corrosion in pipelines and the like by comparative pulse propagation analysis |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2293500A1 true CA2293500A1 (en) | 1998-12-10 |
| CA2293500C CA2293500C (en) | 2010-12-14 |
Family
ID=21955747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2293500A Expired - Fee Related CA2293500C (en) | 1997-06-04 | 1998-06-04 | Method of detecting corrosion in pipelines and the like by comparative pulse propagation analysis |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0998678A4 (en) |
| AU (1) | AU7954598A (en) |
| CA (1) | CA2293500C (en) |
| WO (1) | WO1998055877A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1629228B1 (en) * | 2003-05-06 | 2017-08-16 | WaveTrue, Inc. | Method for non-destructively testing conductive members employing electromagnetic back scattering |
| US9207192B1 (en) | 2009-03-19 | 2015-12-08 | Wavetrue, Inc. | Monitoring dielectric fill in a cased pipeline |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US4970467A (en) * | 1989-04-27 | 1990-11-13 | Burnett Gale D | Apparatus and method for pulse propagation analysis of a pipeline or the like |
| US5243294A (en) * | 1991-10-25 | 1993-09-07 | Pipeline Profiles, Ltd. | Methods of and apparatus for detecting the character and location of anomalies along a conductive member using pulse propagation |
| US5189374A (en) * | 1991-10-25 | 1993-02-23 | Burnett Gale D | Method for pulse propagation analysis of a well casing or the like by transmitted pulse interaction |
| US5270661A (en) * | 1991-10-25 | 1993-12-14 | Pipeline Profiles, Ltd. | Method of detecting a conductor anomaly by applying pulses along the conductor in opposite directions |
| DE4141123C1 (en) * | 1991-12-13 | 1993-03-18 | Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe, De | |
| EP0817974B1 (en) * | 1995-03-14 | 2000-11-08 | Profile Technologies, Inc. | Reflectometry methods for insulated pipes |
-
1998
- 1998-06-04 CA CA2293500A patent/CA2293500C/en not_active Expired - Fee Related
- 1998-06-04 AU AU79545/98A patent/AU7954598A/en not_active Abandoned
- 1998-06-04 WO PCT/US1998/011683 patent/WO1998055877A1/en not_active Application Discontinuation
- 1998-06-04 EP EP98930074A patent/EP0998678A4/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| EP0998678A4 (en) | 2002-02-13 |
| AU7954598A (en) | 1998-12-21 |
| WO1998055877A1 (en) | 1998-12-10 |
| EP0998678A1 (en) | 2000-05-10 |
| CA2293500C (en) | 2010-12-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20180604 |