CA2415067A1 - A pig for detecting an obstruction in a pipeline - Google Patents
A pig for detecting an obstruction in a pipeline Download PDFInfo
- Publication number
- CA2415067A1 CA2415067A1 CA 2415067 CA2415067A CA2415067A1 CA 2415067 A1 CA2415067 A1 CA 2415067A1 CA 2415067 CA2415067 CA 2415067 CA 2415067 A CA2415067 A CA 2415067A CA 2415067 A1 CA2415067 A1 CA 2415067A1
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- Canada
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- detector
- pipeline
- signal
- face
- generating element
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Abstract
An obstacle detecting pig for preliminary inspection of a section of a pipeline is disclosed. It travels through the section and determines if there are any restrictions that exceed industry guidelines or might damage other pigs that require the full bore of the pipe. A resiliently deformable disc-shaped detector has a plurality of segments, each operatively connected to a separate device generating an electrical signal. A
balast retains the detector segments continuously in the same position relative to a vertical reference plane coincident with the axis of the pipeline to improve the indication of the location of an anomaly circumferentially of the pipeline. In a second embodiment, the detector has the structure of resilient adjacent layers separable from each other upon encountering an obstacle. The components generating the electric signal are fully embedded in the respective layers.
balast retains the detector segments continuously in the same position relative to a vertical reference plane coincident with the axis of the pipeline to improve the indication of the location of an anomaly circumferentially of the pipeline. In a second embodiment, the detector has the structure of resilient adjacent layers separable from each other upon encountering an obstacle. The components generating the electric signal are fully embedded in the respective layers.
Claims (18)
1. A caliper pig for detecting an obstruction in a pipeline, comprising:
(a) an elongated body having an axis of elongation, including a front end and a rear end and having carrying guide rings at said front and rear ends for supporting the body in a coaxial sliding engagement with the interior of the pipeline and for driving the body through the pipeline, the front end first, using the flow of fluid in the pipeline, (b) said body supporting a coaxial, generally disc-shaped resiliently deformable detector having a plurality segments disposed about the periphery of the detector, each segment having a predetermined arc and length of its chord;
(c) a plurality of transmission devices each associated with one of said segments for transmitting a generally axial deformation of a radially outer portion of said one of the segments to an electrical signal activating device;
(d) said detector being mounted for free rotation relative to the body about an axis coincident with said axis of elongation;
(e) a ballast operatively associated with said detector to maintain each of said segments in generally the same position relative to a vertical reference plane coincident with said axis of elongation;
(f) said detector having an outer diameter smaller than the inside diameter of the pipeline to define therewith a generally annular void having a predetermined radial clearance.
(a) an elongated body having an axis of elongation, including a front end and a rear end and having carrying guide rings at said front and rear ends for supporting the body in a coaxial sliding engagement with the interior of the pipeline and for driving the body through the pipeline, the front end first, using the flow of fluid in the pipeline, (b) said body supporting a coaxial, generally disc-shaped resiliently deformable detector having a plurality segments disposed about the periphery of the detector, each segment having a predetermined arc and length of its chord;
(c) a plurality of transmission devices each associated with one of said segments for transmitting a generally axial deformation of a radially outer portion of said one of the segments to an electrical signal activating device;
(d) said detector being mounted for free rotation relative to the body about an axis coincident with said axis of elongation;
(e) a ballast operatively associated with said detector to maintain each of said segments in generally the same position relative to a vertical reference plane coincident with said axis of elongation;
(f) said detector having an outer diameter smaller than the inside diameter of the pipeline to define therewith a generally annular void having a predetermined radial clearance.
2. The caliper pig of claim 1 wherein the detector is fixedly secured to a mandrel mounted on said body for rotation about said axis of elongation and axially fixed relative to the body.
3. The caliper pig of claim 2 wherein the ballast is a chamber fixedly secured to the mandrel at a lowermost outer portion thereof.
4. The caliper pig of claim 1 wherein each said transmission device comprises:
(a) a first transmission member;
(b) a second transmission member;
(c) the first transmission member including a first support portion carrying a permanent magnet;
(d) the second transmission member including second support portion carrying a magnetic switch connected to a recording device;
(e) one of said first and second transmission members being secured to the detector to displace its support portion toward the support portion of the other transmission member in dependence of the degree of said axial deformation of the respective segment.
(a) a first transmission member;
(b) a second transmission member;
(c) the first transmission member including a first support portion carrying a permanent magnet;
(d) the second transmission member including second support portion carrying a magnetic switch connected to a recording device;
(e) one of said first and second transmission members being secured to the detector to displace its support portion toward the support portion of the other transmission member in dependence of the degree of said axial deformation of the respective segment.
5. The caliper pig of claim 4 wherein (a) the first transmission member is a generally L-shaped spring having a first arm, a second arm and a pivot at a point of intersection of the first and second arms;
(b) the pivot having a pivot axis generally perpendicular to a reference plane defined by the first and second arm;
(c) the first arm being secured to the detector with a free end of the first arm parallel with one face of the detector; and (d) the second arm projecting at an angle to the face of said one face of the detector and having at its free end one of said first or second support portions;
(e) the second transmission member is fixedly secured relative to the mandrel at a location axially remote from the detector.
(b) the pivot having a pivot axis generally perpendicular to a reference plane defined by the first and second arm;
(c) the first arm being secured to the detector with a free end of the first arm parallel with one face of the detector; and (d) the second arm projecting at an angle to the face of said one face of the detector and having at its free end one of said first or second support portions;
(e) the second transmission member is fixedly secured relative to the mandrel at a location axially remote from the detector.
6. The caliper pig of claim 5, wherein (a) the second support portion carries a permanent magnet;
(b) the second transmission member is an annular spacer carrying a magnetic switch connected with a recording system.
(b) the second transmission member is an annular spacer carrying a magnetic switch connected with a recording system.
7. A caliper pig for detecting an obstruction in a pipeline, including an elongated carrier having an axis of elongation, including a front end and a rear end and having carrying guide rings at said front and rear ends for supporting the carrier in a coaxial sliding engagement with the interior of the pipeline and for driving the carrier through the pipeline, the front end first, using the flow of fluid in the pipeline, said carrier supporting a coaxial, generally disc-shaped resiliently deformable detector, said detector comprising:
(a) a resiliently deformable, disc shaped detector body including a radially inner securement portion secured to the carrier, and an outer flexing portion spaced from the securement portion and adapted to flex relative to said carrier when subjected to a force in a predetermined axial direction, said disc shaped body including (i) a resiliently deformable first member having a leading face and a trailing face; and (ii) a resiliently deformable second member having a leading face and a trailing face;
(iii) the trailing face of one of said first and second members being turned toward the leading face of the other one of said first and second members;
(b) the distance between the faces turned towards each other being at a predetermined minimum when the body is in a relaxed state;
(c) electronic signal generating means disposed in said flexing portion of the body and remote from said securement portion thereof, said signal generating means comprising:
(i) a first generating element secured to said first member and (ii) a second generating element secured to said second member in an alignment with the first generating element when the body is in a relaxed state;
(d) said first and second generating elements being adapted to co-operate to emit a first signal when the the elements are close to each other, and a second signal, distinct from said first signal, when the elements are remote from each other due to a difference between the degree of flexing between the first and second deformable members; and (e) transmission means for transmitting the first and second signal to a recording device.
(a) a resiliently deformable, disc shaped detector body including a radially inner securement portion secured to the carrier, and an outer flexing portion spaced from the securement portion and adapted to flex relative to said carrier when subjected to a force in a predetermined axial direction, said disc shaped body including (i) a resiliently deformable first member having a leading face and a trailing face; and (ii) a resiliently deformable second member having a leading face and a trailing face;
(iii) the trailing face of one of said first and second members being turned toward the leading face of the other one of said first and second members;
(b) the distance between the faces turned towards each other being at a predetermined minimum when the body is in a relaxed state;
(c) electronic signal generating means disposed in said flexing portion of the body and remote from said securement portion thereof, said signal generating means comprising:
(i) a first generating element secured to said first member and (ii) a second generating element secured to said second member in an alignment with the first generating element when the body is in a relaxed state;
(d) said first and second generating elements being adapted to co-operate to emit a first signal when the the elements are close to each other, and a second signal, distinct from said first signal, when the elements are remote from each other due to a difference between the degree of flexing between the first and second deformable members; and (e) transmission means for transmitting the first and second signal to a recording device.
8. The caliper pig of claim 7 wherein the detector is fixedly secured to a mandrel, said mandrel being mounted on said carrier for rotation about said axis of elongation and being axially fixed relative to the carrier.
9. The caliper pig of claim 8 wherein the ballast is a chamber fixedly secured to the mandrel at a lowermost outer portion thereof.
10. The caliper pig of claim 7, wherein the first generating element is a permanent magnet and the second generating means is a magnetic sensor, said transmission means connecting each magnetic sensor to said recording device.
11. The caliper pig of claim 10 wherein the recording device is disposed in said chamber fixedly secured to the mandrel.
12. The caliper of claim 7, wherein said first member and said second member are each an integrally formed disc-like flexible members.
13. A detector, particularly for use in a caliper pig for detecting an obstruction in a pipeline, comprising:
a resiliently deformable body including a securement portion adapted to be secured to a support, and a flexing portion spaced from the securement portion and adapted to flex relative to said support when subjected to a force in a predetermined direction;
said body comprising a resiliently deformable first member having a leading face and a trailing face and a resiliently deformable second member having a leading face and a trailing face;
the trailing face of said first member being turned toward the leading face of said second member;
the distance between the trailing face of said first member and the leading face of said second member being at a predetermined minimum when the body is in a relaxed state;
signal generating means disposed in said flexing portion of the body and remote from said securement portion thereof;
said signal generating means comprising:
a first generating element secured to said first member and and a second generating element secured to said second member in an alignment with the first generating element when the body is in a relaxed state;
said first and second generating elements being adapted to co-operate to emit a first signal when the the elements are close to each other, and a second signal, distinct from said first signal, when the elements are remote from each other due to a difference between the degree of flexing of the flexing portions of the first and second deformable members.
a resiliently deformable body including a securement portion adapted to be secured to a support, and a flexing portion spaced from the securement portion and adapted to flex relative to said support when subjected to a force in a predetermined direction;
said body comprising a resiliently deformable first member having a leading face and a trailing face and a resiliently deformable second member having a leading face and a trailing face;
the trailing face of said first member being turned toward the leading face of said second member;
the distance between the trailing face of said first member and the leading face of said second member being at a predetermined minimum when the body is in a relaxed state;
signal generating means disposed in said flexing portion of the body and remote from said securement portion thereof;
said signal generating means comprising:
a first generating element secured to said first member and and a second generating element secured to said second member in an alignment with the first generating element when the body is in a relaxed state;
said first and second generating elements being adapted to co-operate to emit a first signal when the the elements are close to each other, and a second signal, distinct from said first signal, when the elements are remote from each other due to a difference between the degree of flexing of the flexing portions of the first and second deformable members.
14. The detector of claim 13 wherein - said body, said first member and said second member are generally flat disc shaped, - said securement portion of the body is that portion which is near the center of the body, - said flexing portion is that portion which is remote from said center of the body and close to the circumference of the body, - said body comprises a plurality of said signal generating means disposed at a generally equidistant spacing circumferentially of the body.
15. The detector of claim 14, wherein - the first member and said second member are each a disc made from a rubber-like polyurethane material;
- the first generating element is embedded in the first member near the trailing face thereof; and - the second generating element is embedded in the second member near the leading face thereof.
- the first generating element is embedded in the first member near the trailing face thereof; and - the second generating element is embedded in the second member near the leading face thereof.
16. The detector of claim 15, wherein said first generating element is one of a permanent magnet and a magnetic switch adapted to be connected to a recording device, and said second generating element is the other one of the permanent magnet and the magnetic switch adapted to be connected to a recording device.
17. The detector of claim 14, wherein said second member is disposed behind the first member in the sense of said predetermined direction, and wherein the diameter of said second member is larger than that of the first member.
18. The detector of claim 13 further including a scratch layer disposed between the first member and the second member and is formed by a disc-like plastic sheet.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/269,520 US6679129B2 (en) | 1998-02-18 | 2002-10-11 | Pig for detecting an obstruction in a pipeline |
| US10/269,520 | 2002-10-11 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2415067A1 true CA2415067A1 (en) | 2004-04-11 |
| CA2415067C CA2415067C (en) | 2011-09-06 |
Family
ID=32467696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2415067 Expired - Fee Related CA2415067C (en) | 2002-10-11 | 2002-12-23 | A pig for detecting an obstruction in a pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2415067C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105486268A (en) * | 2016-01-21 | 2016-04-13 | 核工业理化工程研究院 | Thin-wall circular workpiece geometric dimension measurement tool |
| CN113418444A (en) * | 2021-07-05 | 2021-09-21 | 新余学院 | Method and device for deeply detecting non-excavation deeply-buried underground pipeline |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110735994B (en) * | 2019-10-25 | 2021-01-29 | 浙江越新检测技术有限公司 | Magnetic flux leakage detection device in adjustable crawler-type pipeline |
| CN110778791B (en) * | 2019-11-05 | 2021-02-02 | 定远县鑫汇水利建筑工程有限公司 | Underground pipeline laying device |
-
2002
- 2002-12-23 CA CA 2415067 patent/CA2415067C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105486268A (en) * | 2016-01-21 | 2016-04-13 | 核工业理化工程研究院 | Thin-wall circular workpiece geometric dimension measurement tool |
| CN105486268B (en) * | 2016-01-21 | 2018-06-12 | 核工业理化工程研究院 | The dimensional measurement of thin-walled round piece geometric sense has |
| CN113418444A (en) * | 2021-07-05 | 2021-09-21 | 新余学院 | Method and device for deeply detecting non-excavation deeply-buried underground pipeline |
| CN113418444B (en) * | 2021-07-05 | 2022-11-01 | 新余学院 | Non-excavation of degree of depth detection buries underground piping device deeply |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2415067C (en) | 2011-09-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20191223 |