ZA200109029B - Detection of circumferential erosion of a conduit. - Google Patents
Detection of circumferential erosion of a conduit. Download PDFInfo
- Publication number
- ZA200109029B ZA200109029B ZA200109029A ZA200109029A ZA200109029B ZA 200109029 B ZA200109029 B ZA 200109029B ZA 200109029 A ZA200109029 A ZA 200109029A ZA 200109029 A ZA200109029 A ZA 200109029A ZA 200109029 B ZA200109029 B ZA 200109029B
- Authority
- ZA
- South Africa
- Prior art keywords
- conduit
- conductor
- lining
- chairs
- erosion
- Prior art date
Links
- 238000001514 detection method Methods 0.000 title description 16
- 230000003628 erosive effect Effects 0.000 title description 16
- 239000004020 conductor Substances 0.000 claims description 49
- 238000012544 monitoring process Methods 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 11
- 239000002002 slurry Substances 0.000 claims description 6
- 229910001570 bauxite Inorganic materials 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 2
- 238000011065 in-situ storage Methods 0.000 claims description 2
- 239000012777 electrically insulating material Substances 0.000 claims 1
- 239000000523 sample Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 9
- 238000000465 moulding Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 229910021502 aluminium hydroxide Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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
Description
WO30510326 PCT/AU00/00472
DETECTION OF CIRCUMFERENTIAL EROSION OF A CONDUIT
This invention relates to an erosion detector. In particular, the invention concerns a detector for detecting erosion in a conduit or similar member which is : subject to wear.
Pipes used for conveying slurries and outlet cones employed in cyclone separators are subject to high degrees of wear due to the abrasive nature of the slurries and materials which progress through the cones or pipes. The cones and pipes may be lined with a sacrificial and/or wear resistant lining such as a composite including a ceramic or other hard material. The operation of a cyclone separator requires that the size of the outlet aperture be within predefined tolerances. If the diameter of the outlet increases beyond a predetermined size through erosive wear then the outlet cone should be replaced. Similarly, pipes carrying abrasive material such as slurries may fail if the lining is worn away. It is accordingly desirable to determine wear of the liner. bois United States Patent Specification 4642557 discloses a probe in a conduit wall ; for detecting erasion in the wall. The probe consists of an insulated conductor which ’ is in electrical contact, at the base of a blind hole, with the conduit. Wear of the conduit down to the level of the probe may be determined by periodic continuity measurements, a lack of continuity indicting that the inserted end of the probe has been exposed. The probe requires that the pipe in which the insulated conductor is inserted be electrically conductive in addition the construction of the probe is such that it is only able to detect erosion at one particular radial location in the wall of the conduit or pipe. If the length of pipe is installed in a flow path and the probe is radially displaced from the flow path of the material within the pipe then the probe is ineffective in determining erosion at a radially displaced location.
In another known erosion probe two longitudinally spaced non- conductive plugs were placed extending through the wall of the pipe and a conductor was arranged to extend into the pipe, along a length of a non-conductive lining within the pipe and out of the pipe through the other plug. As the lining adjacent the probe wears down to the conductor, continuity of the circuit indicates that the liner is within acceptable dimensions. When the exposed conductor wears through, discontinuity is detected as an indicator for maintenance. However, lining wear may not be circumferentially even. Accordingly, the probe may indicate that the liner is within acceptable dimensions when a portion of the liner circumferentially spaced from the probe has worn beyond acceptable limits.
In one aspect of the invention, there is provided a method of determining erosive wear within a conduit and including the steps of providing said conduit with detection means adapted to detect erosion of said conduit substantially about a circumference of said conduit, and monitoring said detection means. in a further aspect, this invention resides broadly in an erosion detector including detection means adapted to detect erosion of said conduit substantially about a circumference of said conduit, and monitoring means for said detection . 10 means. :
The detection means may comprise remote sensing means such as capacitive, ultrasonic or other means utilizing field variation as a function of erosive wear. For example the detection means may comprise a plurality of plates arrayed about the circumference of the conduit, usually about the outer surface of, or embedded in, a liner. Monitoring means in this case may utilize the change in ’ capacitance over time between the plates and the slurry, the change being a function of the thickness of the liner at the radial location of each plate. Alternatively, the . detection means may comprise an embedded conductor extending substantially about the circumference of the conduit whereby monitoring means may monitor the continuity of the conductor. The conductor may be embedded in a liner, be disposed about the outer surface of the liner, or in the case of an unlined conduit, be embedded in the conduit wall.
The lining where used is preferably a moulded lining formed of a composite material whereby the detection means may be embedded therein during formation of the lining. Examples of suitable lining materials include those composites of a refractory material such as a ceramic and a binder. One liner material of this class is the composite of sintered bauxite and epoxy resin currently used to line slurry pipes and cyclone outlet cones. In this composite, bauxite (crude hydrated aluminium hydroxide) is sintered at high temperatures and the sinter crushed to produce a hard particulate material. The liner is formed up by mixing the crushed sintered bauxite with epoxy resin, moulding to shape and curing. The linings so formed are insulative with considerable dielectric strength.
. wg 0970326 PCT/AU00/00472
In the moulding stage detection means may be set up in the composite by any suitable means. For example, the detection means may be supported on chairs or the like during the moulding process. The chairs may be left in situ in the lining or may be removed after curing, whereupon the voids formed thereby are filled the lining composite or other material. In the case of detection means requiring electrical or other connection to monitoring means outside of the conduit, the chairs may be configured whereby they extend through openings provided in the conduit wall and have the connection passing therethrough. To this end and to avoid the need for insulating electrical connection, the chairs are preferably formed of an insulating material.
The conductor when used may be coated with an insulating material if the lining is electrically conductive. Where the lining is non-conductive, the conductor need not be insulated. Any suitable electrically conductive material may be employed for the conductor. Preferably the conductor is selected to wear at least as readily as * 15 the lining material whereby the conductor does not overly resist wear when the liner is worn to the conductor. For example, the conductor may be made from stainless ’ steel. The conductor may extend through walls of the cyclone cone or conduit.’
Where the conductor extends through the walls, insulating plugs apart from the foregoing chairs may be employed to electrically isolate the conductor from the walls of the conduit. The conductor may extend through the plugs. The plugs may be made from any suitable material.
Preferably the chairs and/or plugs are made from polyurethane. The conductor embedded in the lining may follow a slightly helical path and the circular part of the conductor may be present as a complete circle or may extend through more than 360°. In this way the plugs and the ends of the conductor may be positioned so that end portions of the conductor may overlap and extend past each other.
The monitoring means may take any suitable form in general dictated by the selection of detection means. For example, in the case of capacitive detection means or an embedded circumferential conductor, the monitoring means may comprise an electronic monitoring means having suitable input characteristics and output a numeric or graphic display, alarm or the like. In the case of an ultrasonic detection means, the monitoring means may include a circuit adapted to analyse the ultrasonic transducers for return signal and provide a suitable output.
The ends of the conductor may be coupled to a remote continuity monitoring system via any suitable link such as a cable, radio link or the like.
Particular preferred embodiments of the invention will now be described by way of example with reference to the drawing in which:
Figure 1 is a partially sectioned elevation of a cyclone cone incorporating the erosion detector according to an embodiment of the invention-
Figure 2 is a section taken along line A of Figure 1; and
Figure 3 is a transverse sectional view of a conduit incorporating the erosion detector of an embodiment of the invention.
Figures 1 and 2 show a cyclone cone 10 having an outer metallic wall 11 lined with a wear resistant lining 12. The lining 12 in this case is a moulded sintered bauxite/epoxy composite. Apertures 13 and 14 are radially spaced from one another and are formed by setting up insulating plugs 15 and 16 during the moulding of the ) liner. A conductor 17 is embedded within the lining during formation thereof. In the illustrated embodiment, the conductor 17 is shown extending substantially around the : cone and is spaced from the interior surface 18, through which material may pass from the cone, by a selected distance. The conductor is shown this way for clarity in illustration in simple section. It is however preferred that the conductor 17 describe a slightly helical shape such that in practice the ends 18 of the conductor 17 are circumferentially overlapped and longitudinally spaced. The ends 18 of the conductor project beyond the plugs 15 and 16 and allow the electrical continuity of the conductor to be tested. Once the lining wears and the conductor is broken, a continuity test will indicate that the lining has worn to the depth to which the conductor was imbedded within the lining.
The cone may then be replaced to ensure effective operation of the cyclone to which the cone is attached. Since the conductor extends substantially all of the way around the cone the erosion detector is responsive to excessive wear at any radial location around the interior of the cone.
Figure 3 shows a transverse sectional view across a conduit 20. 25 The conduit 20 has a wall 21 and a wear resistant lining 22 having an inner surface 23. A plurality of support plugs 24 extend through the wall 21 and support the conductor 25
I. .
WQ.00/70326 "PCT/AU00/00472 ( ~, & at a desired spacing from the inner surface 23. The plugs 24 are made from any suitable electrically non-conducting material such as polyurethane. The conductor 25 extends substantially around the conduit and terminates in free ends 26 which project through insulating plugs 27 and 28. 5 The continuity of the conductor may be periodically measured and if a break in continuity is detected this denotes that the lining has been worn down to the depth of the conductor.
If desired a plurality of conductors may be present within the lining and the \ conductors may be located at different depths within the lining. In this way the thickness of the remaining lining may be monitored and when the lining is too thin the conduit may then be replaced. "In a typical method of manufacture of a lined conduit in accordance with the invention, a steel pipe or cyclone outlet is formed with apertures into which are inserted polyurethane moulded chairs extending into the conduit. The chairs in turn support one or more circumferential conductors, which has its ends led out of the conduit through selected ones of the chairs. The composite lining is then moulded within the conduit, embedding the chairs and the one or more conductors.
It will of course be realised that while the above has been given by way of illustrative example of this invention, all such and other modifications and variations thereto as would be apparent to persons skilled in the art are deemed to fall within the broad scope and ambit of this invention as defined in the claims appended hereto.
Claims (6)
1. A conduit comprising an outer shell and a moulded lining formed of a composite of a ceramic and a binder and having an embedded conductor extending substantially about the circumference of the conduit and : supported on chairs or the like of an electrically insulating material during formation of the lining, said chairs being left in situ in the lining after formation thereof, at least some of said chairs extending through openings provided in the outer shell and having a connection passing therethrough from said conductor to monitoring means for monitoring the continuity of said conductor.
2. A conduit according to claim 1, wherein said composite comprises sintered bauxite and epoxy resin.
3. A conduit according to claim 1 or claim 2, wherein said conductor is ‘ disposed helically in the lining and extending through more than 360° whereby opposed ends thereof are displaced longitudinally one from the other. :
4, A conduit according to claim 1 or claim 2, and comprising a slurry pipe.
S. A conduit according to claim 1 or claim 2, and comprising a cyclone cone.
6. A conduit substantially as hereinbefore described with reference to the accompanying drawings. Clean Copy 1 HOY 2002 | ~
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPQ0405A AUPQ040599A0 (en) | 1999-05-18 | 1999-05-18 | An erosion detector |
Publications (1)
Publication Number | Publication Date |
---|---|
ZA200109029B true ZA200109029B (en) | 2002-12-02 |
Family
ID=3814608
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ZA200109029A ZA200109029B (en) | 1999-05-18 | 2001-11-01 | Detection of circumferential erosion of a conduit. |
Country Status (5)
Country | Link |
---|---|
CN (1) | CN1350637A (en) |
AU (1) | AUPQ040599A0 (en) |
CA (1) | CA2372723A1 (en) |
WO (1) | WO2000070326A1 (en) |
ZA (1) | ZA200109029B (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101118203B (en) * | 2007-08-24 | 2010-04-14 | 武汉理工大学 | Test method of sample destroy time in tube of glass fibre reinforced plastic long-term performance test |
CN101280889B (en) * | 2007-12-29 | 2011-12-14 | 中国石油化工股份有限公司西南油气分公司 | Method for monitoring gas pipeline internal corrosion |
GB201021528D0 (en) * | 2010-12-20 | 2011-02-02 | Cyclotech Ltd | Hydrocyclone condition monitoring |
NL2006871C2 (en) * | 2011-05-31 | 2012-12-03 | Ihc Holland Ie Bv | System for monitoring wear of a piping element for transporting slurry. |
CN102608142B (en) * | 2012-03-20 | 2014-04-23 | 华北电力大学 | Method for detecting pipeline corrosion products of pressurized water reactor nuclear power station |
EA036609B1 (en) | 2013-08-09 | 2020-11-30 | Вир Минералс Австралия Лтд | Cyclone separator apparatus and method of production thereof |
US9880087B2 (en) * | 2014-01-24 | 2018-01-30 | The Chugoku Electric Power Co., Inc. | Remaining service life evaluation method for metal pipe suffering from creep damage |
CN105466845B (en) * | 2015-12-01 | 2019-08-02 | 新奥环保技术有限公司 | A kind of overcritical equipment and its corrosion monitoring process |
DE102017114655A1 (en) * | 2017-06-30 | 2019-01-03 | Esser-Werke Gmbh & Co. Kg | Solid material delivery component with wear indicator |
CN109765134B (en) * | 2018-12-14 | 2021-05-25 | 大连理工大学 | Pipeline inner wall abrasion corrosion monitoring device and monitoring method thereof |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4110739A (en) * | 1976-08-02 | 1978-08-29 | Kidd John A | Means for detecting leakage in the inner lining of tanks and piping |
GB2015165B (en) * | 1978-02-09 | 1983-01-12 | Koa Oil Co Ltd | Detecting capacitively corrosion of pipes |
DE3140804A1 (en) * | 1981-10-14 | 1983-04-21 | kabelmetal electro GmbH, 3000 Hannover | Flexible conduit |
US4655077A (en) * | 1985-05-31 | 1987-04-07 | Purvis Howard A | Wear sensor system |
CA2038701C (en) * | 1991-03-20 | 1996-01-02 | Stanley Lloyd Baldwin | Conduit liner monitor |
US5377533A (en) * | 1992-07-20 | 1995-01-03 | Shaw; Larry | Method of taking erosion/corrosion measurements |
-
1999
- 1999-05-18 AU AUPQ0405A patent/AUPQ040599A0/en not_active Abandoned
-
2000
- 2000-05-18 WO PCT/AU2000/000472 patent/WO2000070326A1/en active IP Right Grant
- 2000-05-18 CN CN00807595A patent/CN1350637A/en active Pending
- 2000-05-18 CA CA002372723A patent/CA2372723A1/en not_active Abandoned
-
2001
- 2001-11-01 ZA ZA200109029A patent/ZA200109029B/en unknown
Also Published As
Publication number | Publication date |
---|---|
AUPQ040599A0 (en) | 1999-06-10 |
CA2372723A1 (en) | 2000-11-23 |
WO2000070326A1 (en) | 2000-11-23 |
CN1350637A (en) | 2002-05-22 |
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