GB2211708A - Radiographic detection of pipe corrosion under lagging - Google Patents

Radiographic detection of pipe corrosion under lagging Download PDF

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Publication number
GB2211708A
GB2211708A GB8725125A GB8725125A GB2211708A GB 2211708 A GB2211708 A GB 2211708A GB 8725125 A GB8725125 A GB 8725125A GB 8725125 A GB8725125 A GB 8725125A GB 2211708 A GB2211708 A GB 2211708A
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GB
United Kingdom
Prior art keywords
detector
source
pipe
corrosion
recording means
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
Application number
GB8725125A
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GB8725125D0 (en
GB2211708B (en
Inventor
Stephen Geoffrey Drake
Colin John Seward
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OIS ENGINEERING Ltd
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OIS ENGINEERING Ltd
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by OIS ENGINEERING Ltd filed Critical OIS ENGINEERING Ltd
Priority to GB8725125A priority Critical patent/GB2211708B/en
Publication of GB8725125D0 publication Critical patent/GB8725125D0/en
Publication of GB2211708A publication Critical patent/GB2211708A/en
Application granted granted Critical
Publication of GB2211708B publication Critical patent/GB2211708B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
    • G01N23/18—Investigating the presence of flaws defects or foreign matter
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
    • G01N23/083—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption the radiation being X-rays

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  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Toxicology (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)

Abstract

Detection of underlagging corrosion on pipes (10), wherein a radiographic source (14) and an aligned radiation detector (15) are scanned over the outside of a lagged pipe (10), such that radiation from the source (14) penetrates the lagging and at least the surface of the pipe (10) before meeting the detector (15), and the latter is linked to display and/or recording means which immediately shows and/or records signals received by the detector (15) from the source (14). The source and detector are driven around the pipe by engagement with a ring gear (13) and along the pipe by engagement with a track (12). <IMAGE>

Description

CORROSION DETECTION This invention is concerned with the detection of corrosion and, more specifically, with the detection of corrosion on the outside of pipework under lagging.
Such corrosion is normally referred to as underlagging corrosion.
One conventional method of detecting under lagging corrosion is by visual inspection after removing the lagging. This method is very costly. Radiographic inspection is also used, either using film - which is a very slow and a costly process - or using flash radiography - which is less slow than the film process but which provides a low quality of information.
It is an object of the present invention to provide a method of detecting underlagging corrosion which can be used to produce high quality results quickly.
According to the invention, there is provided a method of detecting under lagging corrosion on pipes in which a radiographic source and an aligned radiation detector are scanned over the outside of a lagged pipe, the arrangement being such that the radiation from the source penetrates the lagging and at least the surface of the pipe before meeting the detector, and said detector being linked to display and/or recording means which immediately show and/or record signals received by the detector from the source.
The radiographic source may be an X-ray source or a source of gamma rays derived from a radio-active isotope, e.g. IRIDIUM 192, COBALT 60 OR YTTERBIUM 193.
The detector may be a linear array of radiationsensitive diodes, or may be a fluoroscopic system using an image intensifier and video camera.
In practice, a mechanical support system will be provided to hold the source and the detector-on opposite sides of the pipe and enable them to be traversed circumferentially and lengthwise of the pipe, either continuously or step-by-step.
The above method enables good results to be obtained at high speed and, since "real-time" images can be produced, the results are immediately available and, if necessary, immediately verifiable.
The display means may conveniently comprise a TV monitor and the recording means may comprise a video tape or laser disc.
An embodiment of apparatus for carrying out the present invention is shown, by way of example only, in the drawings, in which: Fig. 1 is a schematic drawing of the apparatus, and Figs. 2 and 3 show two different methods of operating the apparatus.
In Fig. 1, a lagged pipe 10, which is being tested for underlagging corrosion, has secured thereon, by bands 11, a linear track 12. A scanning Jig 13 surrounds the pipe and is coupled to the track 12 so that the jig can be moved along the pipe. The jig can be rotated around the pipe and carries an X-ray head 14 and an X-ray detector head 15. Thus, the heads 14 and 15 can be simultaneously scanned around and along the pipe.
The X-rays may be directed diametrically through the pipe, as shown in Fig. 2, or tangentially of the pipe, as shown in Fig. 3.
The detector head 15 is preferably in the form of a linear array of diodes, ass previously mentioned, and may be connected to an acquisition unit which supplies information to a TV display unit via a frame store, which is under the control of a system controller.

Claims (18)

1. A method of detecting underlagging corrosion on pipes in which a radiographic source and an aligned radiation detector are scanned over the outside of a lagged pipe, such that the radiation from the source penetrates the lagging and at least the surface of the pipe before meeting the detector, wherein the detector is linked to display and/or recording means which shows and/or records immediately signals received by the detector from the source.
2. A method according to Claim 1, wherein the radiographic source is provided by an X-ray or gamma ray source derived from a radioactive isotope.
3. A method according to Claim 2, wherein the radioactive isotope is provided by Iridium 192, Cobalt 60 or Ytterbium 193.
4. A method according to Claim 1, 2 or 3, wherein the detector is provided by a linear array of radiation-sensitive diodes.
5. A method according to Claim 1, 2 or 3, wherein the detector is provided by a fluoroscopic system using an image intensifier and video camera.
6. A method according to any preceding claim, wherein the source and detector are provided on opposed sides of the pipe and are caused to traverse the pipe circumferentially and lengthwise thereof, either continuously or step-by-step.
7. A method according to any preceding claim, wherein the display means is provided by a television monitor.
8. A method according to any preceding claim, wherein said recording means comprises a video tape or laser disc.
9. A method of detecting underlagging corrosion on pipes substantially as hereinbefore described.
10. Apparatus for detecting underlagging corrosion on pipes comprising a radiographic source and an aligned radiation detector arranged to be scanned over the outside of a lagged pipe and display and/or recording means linked to the detector, the arrangement being such that, in use of the apparatus, radiation from the source penetrates the lagging and at least the surface of the pipe before meeting the detector and signals received by the detector from the source are immediately shown and/or recorded on the respective display and/or recording means.
11. Apparatus according to Claim 10, wherein the radiographic source comprises an X-ray or gamma ray source derived from a radioactive isotope.
12. Apparatus according to Claim 11, wherein the radioactive isotope is Iridium 192, Cobalt 60 or Ytterbium 193.
13. Apparatus according to Claim 10, 11 or 12, wherein the detector is a linear array of radiationsensitive diodes.
14. Apparatus according to Claim 10, 11 or 12, wherein the detector comprises a fluoroscopic system employing an image intensifier and video camera.
15. Apparatus according to any of Claims 10 to 14 including a mechanical support system arranged to hold the source and detector on opposed sides of the pipe and to enable them to traverse the pipe circumferentially and lengthwise thereof, either continuously or step-by-step.
16. Apparatus according to any of Claims 10 to 15, wherein said display means comprises a television monitor.
17. Apparatus according to any of Claims 10 to 16, wherein said recording means comprises a video tape or laser disc.
18. Apparatus for detecting underlagging corrosion on pipes, substantially as hereinbefore described with reference to the accompanying drawing.
GB8725125A 1987-10-27 1987-10-27 Corrosion detection Expired - Fee Related GB2211708B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8725125A GB2211708B (en) 1987-10-27 1987-10-27 Corrosion detection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8725125A GB2211708B (en) 1987-10-27 1987-10-27 Corrosion detection

Publications (3)

Publication Number Publication Date
GB8725125D0 GB8725125D0 (en) 1987-12-02
GB2211708A true GB2211708A (en) 1989-07-05
GB2211708B GB2211708B (en) 1991-04-17

Family

ID=10625951

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8725125A Expired - Fee Related GB2211708B (en) 1987-10-27 1987-10-27 Corrosion detection

Country Status (1)

Country Link
GB (1) GB2211708B (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5420427A (en) * 1990-06-22 1995-05-30 Integrated Diagnostic Measurement Corporation Mobile, multi-mode apparatus and method for nondestructively inspecting components of an operating system
DE4343513A1 (en) * 1993-12-20 1995-06-22 Siemens Ag Measuring system for welded seam testing
DE4446960A1 (en) * 1994-10-17 1996-04-18 Sandor Kovacs X-ray machine
US5614720A (en) * 1990-06-22 1997-03-25 Integrated Diagnostic Measurement Corporation Mobile, multi-mode apparatus and method for nondestructively inspecting components of an operating system
US5648619A (en) * 1994-10-19 1997-07-15 Kvaerner Masa-Yards Oy Arrangement for inspection of welded plate sections
CN101387611B (en) * 2008-10-14 2011-02-09 重庆大学 Detection method of translational pipe CT detection device
CN102695453A (en) * 2009-08-28 2012-09-26 超科有限公司 Method and apparatus for external pipeline weld inspection
WO2015097452A1 (en) * 2013-12-23 2015-07-02 Johnson Matthey Public Limited Company Adapter for measuring instrument
CN105445300A (en) * 2015-12-16 2016-03-30 天津三英精密仪器有限公司 Full-field rod-shaped sample CT scanning device
WO2016147006A1 (en) * 2015-03-17 2016-09-22 Johnson Matthey Public Limited Company Apparatus and method for scanning a structure
CN109488887A (en) * 2017-09-11 2019-03-19 波音公司 X-ray inspection system for pipeline
US10502697B2 (en) 2017-09-11 2019-12-10 The Boeing Company High speed pipe inspection system
US11402339B2 (en) 2011-11-02 2022-08-02 Johnson Matthey Public Limited Company Scanning method and apparatus comprising a buoyancy material for scanning an underwater pipeline or a process vessel
EP4134663A1 (en) * 2021-08-13 2023-02-15 Mistras Group, Inc Automated circumferential pipe scanning system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR102019004976B1 (en) 2019-03-14 2021-10-26 Petróleo Brasileiro S.A. - Petrobras ANNULAR FLOODING DEVICE, ASSEMBLY AND METHOD WITH GAMMA TRANSMISSION IN A FLEXIBLE DUCT

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2064929A (en) * 1979-10-29 1981-06-17 Redmayne & Sons Its Ltd S Pipe radiography apparatus and method
GB2157930A (en) * 1984-04-13 1985-10-30 Ian Geoffrey Brewis Redmayne Radiography apparatus
EP0173660A2 (en) * 1984-08-27 1986-03-05 Stig Dahn A method of detecting with the aid of x-ray radiation heterogeneities in the insulation of pipe assemblies in district heating systems, and apparatus for carrying out the method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2064929A (en) * 1979-10-29 1981-06-17 Redmayne & Sons Its Ltd S Pipe radiography apparatus and method
GB2157930A (en) * 1984-04-13 1985-10-30 Ian Geoffrey Brewis Redmayne Radiography apparatus
EP0173660A2 (en) * 1984-08-27 1986-03-05 Stig Dahn A method of detecting with the aid of x-ray radiation heterogeneities in the insulation of pipe assemblies in district heating systems, and apparatus for carrying out the method

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5420427A (en) * 1990-06-22 1995-05-30 Integrated Diagnostic Measurement Corporation Mobile, multi-mode apparatus and method for nondestructively inspecting components of an operating system
US5614720A (en) * 1990-06-22 1997-03-25 Integrated Diagnostic Measurement Corporation Mobile, multi-mode apparatus and method for nondestructively inspecting components of an operating system
DE4343513A1 (en) * 1993-12-20 1995-06-22 Siemens Ag Measuring system for welded seam testing
DE4446960A1 (en) * 1994-10-17 1996-04-18 Sandor Kovacs X-ray machine
US5648619A (en) * 1994-10-19 1997-07-15 Kvaerner Masa-Yards Oy Arrangement for inspection of welded plate sections
CN101387611B (en) * 2008-10-14 2011-02-09 重庆大学 Detection method of translational pipe CT detection device
CN102695453A (en) * 2009-08-28 2012-09-26 超科有限公司 Method and apparatus for external pipeline weld inspection
US9217720B2 (en) 2009-08-28 2015-12-22 Shawcor Ltd Method and apparatus for external pipeline weld inspection
CN102695453B (en) * 2009-08-28 2016-01-20 超科有限公司 For the method and apparatus of exterior tubing welding inspection
EP3650845B1 (en) * 2011-11-02 2024-02-14 Johnson Matthey Public Limited Company Scanning method and apparatus
US11474053B2 (en) 2011-11-02 2022-10-18 Johnson Matthey Public Limited Company Scanning method and apparatus comprising a buoyancy material and a remotely operated vehicle (ROV) for scanning an underwater pipeline or a process vessel
US11402339B2 (en) 2011-11-02 2022-08-02 Johnson Matthey Public Limited Company Scanning method and apparatus comprising a buoyancy material for scanning an underwater pipeline or a process vessel
US10132762B2 (en) 2013-12-23 2018-11-20 Johnson Matthey Public Limited Company Adapter for measuring instrument
AU2014372315B2 (en) * 2013-12-23 2019-02-28 Tracerco Limited Adapter for measuring instrument
US10416100B2 (en) 2013-12-23 2019-09-17 Johnson Matthey Public Limited Company Adapter for measuring instrument
WO2015097452A1 (en) * 2013-12-23 2015-07-02 Johnson Matthey Public Limited Company Adapter for measuring instrument
US10697905B2 (en) 2015-03-17 2020-06-30 Johnson Matthey Public Limited Company Apparatus and method for scanning a structure
WO2016147006A1 (en) * 2015-03-17 2016-09-22 Johnson Matthey Public Limited Company Apparatus and method for scanning a structure
CN105445300A (en) * 2015-12-16 2016-03-30 天津三英精密仪器有限公司 Full-field rod-shaped sample CT scanning device
CN109488887A (en) * 2017-09-11 2019-03-19 波音公司 X-ray inspection system for pipeline
EP3454049A3 (en) * 2017-09-11 2019-04-10 The Boeing Company X-ray inspection system for pipes
US10502697B2 (en) 2017-09-11 2019-12-10 The Boeing Company High speed pipe inspection system
US10578565B2 (en) 2017-09-11 2020-03-03 The Boeing Company X-ray inspection system for pipes
EP4134663A1 (en) * 2021-08-13 2023-02-15 Mistras Group, Inc Automated circumferential pipe scanning system
US11639905B2 (en) 2021-08-13 2023-05-02 Mistras Group, Inc. Automated circumferential pipe scanning system

Also Published As

Publication number Publication date
GB8725125D0 (en) 1987-12-02
GB2211708B (en) 1991-04-17

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 19931027