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WO2006059136A1 - Sonde de surveillance de corrosion - Google Patents

Sonde de surveillance de corrosion Download PDF

Info

Publication number
WO2006059136A1
WO2006059136A1 PCT/GB2005/004646 GB2005004646W WO2006059136A1 WO 2006059136 A1 WO2006059136 A1 WO 2006059136A1 GB 2005004646 W GB2005004646 W GB 2005004646W WO 2006059136 A1 WO2006059136 A1 WO 2006059136A1
Authority
WO
WIPO (PCT)
Prior art keywords
seal
housing
probe
fluid
force
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.)
Ceased
Application number
PCT/GB2005/004646
Other languages
English (en)
Inventor
Eric Atherton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Capcis Ltd
Original Assignee
Capcis 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.)
Filing date
Publication date
Application filed by Capcis Ltd filed Critical Capcis Ltd
Publication of WO2006059136A1 publication Critical patent/WO2006059136A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • G01N17/04—Corrosion probes

Definitions

  • This invention relates to a method and apparatus for monitoring the corrosion of pipes, tubes and vessels.
  • Corrosion causes considerable economic loss, and can in certain circumstances represent a safety hazard, particularly when the corroding item is a pressure vessel pipe or tube under pressure.
  • pressure vessels, pipes or tubes containing corrosive chemicals may occur for example in chemical refineries, oil and gas production and transportation facilities at the surface, subsea, and subsurface, water and waste water treatment and transportation facilities.
  • a probe may be inserted in the vessel, containing electrically insulated elements made of the same material as the vessel. These insulated elements corrode at substantially the same rate as the vessel. Corrosion on the elements causes small currents and voltages to arise, which can be detected by sensitive instrumentation. These currents and voltages may be interpreted to indicate the occurrence and type of corrosion occurring. An explanation of this interpretation can be found in WO01/98753 or in the paper by Eden, Hladky and John ("Corrosion 86 Paper 274", March 1986).
  • the present invention relates to a method of probe manufacture that seeks to overcome these problems, and allow use of a sealing material between the probe element and probe body made of a relatively compliant material, such as polytetraflouroethylene (PTFE).
  • PTFE polytetraflouroethylene
  • a compliant seal can be maintained in compression using a separate spring element typically mounted inside the probe, which maintains a force on the element with respect to the body such that the seal is always in compression.
  • the present invention provides a sensor comprising a housing having an aperture, through which at least one element is exposed to an environment, and a seal disposed in the aperture between the housing and the element, the seal being urged into a sealing state by a force exerted on the seal and created by a biasing means located within the housing.
  • the force can be transmitted to the seal via the element, enabling the seal to be compressed by the force between a seat and the element.
  • a suitable biasing means is a spring, such as a tensile spring.
  • a further aspect of this invention is the provision of a pressure-balancing mechanism, whereby the inside of the probe is filled with a non-corrosive fluid, at substantially the same pressure as the corrosive medium on the exterior of the probe. This reduces or eliminates the force on the insulated elements due to pressure, and so eliminates the risk of the PTFE extruding under high external pressure.
  • the present invention provides a sensor comprising a housing with an opening allowing ingress of fluid from the environment external thereto into the interior of the housing, wherein the opening leads to a closed bellows within the housing, a remainder of the interior being filled with a fluid.
  • the fluid is one that is substantially incompressible, such as an oil.
  • a further aspect of the present invention is the inclusion of a corrodible fuse within the body of the probe, such that the occurrence of an open-circuit in this fuse provides an early warning of corrosive fluid ingress into the probe.
  • Figure 1 shows a probe fitted in a pressure vessel
  • Figure 2 shows a section through the probe of figure 1.
  • a probe 20 is fitted into a vessel 21.
  • the probe 20 is connected to an instrumentation package 22 via a multicore cable 24.
  • Corrosive fluid 23 is contained within the vessel 21.
  • FIG. 2 shows the probe in more detail, where a cylindrical probe body 1 can be sealed into vessel 21 using O-ring 5.
  • the elements 2 are manufactured in the same material as vessel 21 and are each sealed into body 1 using seal 3, which is compressed between suitably shaped seat in the body 1 and the element 2, due to tension on a rod 4 that is threaded into element 2.
  • Rod 4 is maintained in tension due to a load imparted by a spring 6 acting against plate 7 attached to the interior of body 1.
  • Plate 7 is manufactured from an electrically insulative material, as is seal 3.
  • Rod 4 is wired to terminal 12 and in addition to pulling element 2 into body 1 also electrically connects the insulated element 2 to terminal 12. This is in turn connected to the cable 24 from the instrumentation package 22 so that the instrumentation package 22 can measure the naturally occurring voltages and currents on the elements 2 and hence infer corrosion activity using well known methods.
  • the corrosive fluid 23 that is external to the probe 20 may enter the probe body 1 via an aperture 8 between the elements 2 and into a bellows 9.
  • the inside of body 1 is filled with oil 10.
  • the oil 10 fills the inside of body 1 completely, with no voids, so that small changes in the length of bellows 9 will equalise the pressure between oil 10 and corrosive fluid 23.
  • the bellows 9 does not reach the end of its travel limits in either direction, there will be little or no pressure difference between the oil 10 and the corrosive fluid 23.
  • a small wire fuse 25 is internally connected between two of the terminals 12, of which at least one is unused. In the event that corrosive fluid 23 does permeate into the body 1, it will corrode this wire fuse 25, deliberately made of a highly corrodible metal.
  • the instrumentation package 22 can detect the failure of the fuse 25, and hence can provide an early warning of probe failure due to corrosive fluid ingress.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Environmental Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

La présente invention décrit un joint flexible pour une sonde qui peut être maintenu en compression à l’aide d’un élément de ressort séparé monté à l’intérieur de la sonde, qui maintient une force sur l’élément par rapport au corps de sorte que le joint est toujours en compression. Ainsi, un capteur comprend un logement possédant une ouverture à travers laquelle au moins un élément est exposé à un environnement et un joint disposé dans l’ouverture entre le logement et l’élément, le joint étant poussé dans un état d’étanchéité par une force exercée sur le joint et créé par un moyen de sollicitation positionné à l’intérieur du logement. La force peut être transmise au joint par l’intermédiaire de l’élément, permettant au joint d’être comprimé par la force entre un siège et l’élément. Un mécanisme d’équilibrage de pression est également décrit, moyennant quoi l’intérieur de la sonde est rempli d’un fluide non corrosif à sensiblement la même pression que le milieu corrosif à l’extérieur de la sonde. Ainsi, un capteur comprend un logement avec une ouverture qui permet l’entrée dans le logement de fluide provenant de son environnement externe et conduit à un soufflet fermé à l’intérieur du logement, le reste de l’intérieur étant rempli d’un fluide. Enfin, lesdits capteurs bénéficient de l’inclusion d’un fusible corrodable à l’intérieur du corps de la sonde, de sorte que la survenue d’un circuit ouvert dans ce fusible fournit un avertissement précoce de l’entrée de fluide corrosif dans la sonde. Typiquement, ces mesures seront particulièrement utiles dans un capteur de corrosion.
PCT/GB2005/004646 2004-12-03 2005-12-02 Sonde de surveillance de corrosion Ceased WO2006059136A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0426552.6 2004-12-03
GB0426552A GB2420857B (en) 2004-12-03 2004-12-03 Corrosion monitoring probe

Publications (1)

Publication Number Publication Date
WO2006059136A1 true WO2006059136A1 (fr) 2006-06-08

Family

ID=34044001

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2005/004646 Ceased WO2006059136A1 (fr) 2004-12-03 2005-12-02 Sonde de surveillance de corrosion

Country Status (2)

Country Link
GB (1) GB2420857B (fr)
WO (1) WO2006059136A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011148131A3 (fr) * 2010-05-25 2012-02-02 Heating System Innovations Ltd Procédé et appareil de contrôle de corrosion

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101299017B (zh) * 2008-06-19 2010-11-17 上海交通大学 预埋式钢筋锈蚀率监测仪

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2187117A5 (en) * 1972-05-31 1974-01-11 Commissariat Energie Atomique Remote control of deformation measurements - of a test sample under compression or tension in a flux of radiation or other aggressive environment
GB2049181A (en) * 1979-04-06 1980-12-17 Ici Ltd Detection of acidic solvent decomposition products
US20040168526A1 (en) * 1996-08-22 2004-09-02 Mayeaux Donald P. System for retrieving a gas phase sample from a gas stream containing entrained liquid, and sample conditioner assembly therefore
US20040216535A1 (en) * 2002-10-15 2004-11-04 Joseph Brostmeyer High temperature and pressure testing facility

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3956937A (en) * 1974-11-21 1976-05-18 International Telephone And Telegraph Corporation Pressure sensing system
GB1600134A (en) * 1977-03-03 1981-10-14 Ici Ltd Corrosion monitoring probe
US4334215A (en) * 1979-04-27 1982-06-08 Tire-Tronics, Inc. Continuous heat and pressure surveillance system for pneumatic tires
JPS6021963U (ja) * 1983-07-21 1985-02-15 日本特殊陶業株式会社 ガスセンサ
US4595487A (en) * 1985-03-18 1986-06-17 Kennecott Corporation Sensing probe holder system
DD246166A1 (de) * 1986-02-20 1987-05-27 Univ Rostock Differenzdruckaufnehmer
US4876672A (en) * 1988-03-01 1989-10-24 Atlantic Richfield Company Ultrasonic logging tool with rotating exposed transducer
JPH08313379A (ja) * 1995-05-15 1996-11-29 Nippon Pillar Packing Co Ltd 圧力センサ
JP3600171B2 (ja) * 2001-03-07 2004-12-08 株式会社 拓和 液体圧力測定センサおよび水位測定装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2187117A5 (en) * 1972-05-31 1974-01-11 Commissariat Energie Atomique Remote control of deformation measurements - of a test sample under compression or tension in a flux of radiation or other aggressive environment
GB2049181A (en) * 1979-04-06 1980-12-17 Ici Ltd Detection of acidic solvent decomposition products
US20040168526A1 (en) * 1996-08-22 2004-09-02 Mayeaux Donald P. System for retrieving a gas phase sample from a gas stream containing entrained liquid, and sample conditioner assembly therefore
US20040216535A1 (en) * 2002-10-15 2004-11-04 Joseph Brostmeyer High temperature and pressure testing facility

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011148131A3 (fr) * 2010-05-25 2012-02-02 Heating System Innovations Ltd Procédé et appareil de contrôle de corrosion

Also Published As

Publication number Publication date
GB0426552D0 (en) 2005-01-05
GB2420857A (en) 2006-06-07
GB2420857B (en) 2009-05-20

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