CN111664311A - Online leakage detection corrugated pipe compensator and leakage detection method - Google Patents
Online leakage detection corrugated pipe compensator and leakage detection method Download PDFInfo
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- CN111664311A CN111664311A CN202010652641.0A CN202010652641A CN111664311A CN 111664311 A CN111664311 A CN 111664311A CN 202010652641 A CN202010652641 A CN 202010652641A CN 111664311 A CN111664311 A CN 111664311A
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- corrugated pipe
- layer corrugated
- bellows
- leak detection
- compensator
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- 238000001514 detection method Methods 0.000 title claims abstract description 70
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 238000003466 welding Methods 0.000 claims abstract description 9
- 239000010410 layer Substances 0.000 claims description 53
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 17
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 10
- 239000001569 carbon dioxide Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 5
- 239000011229 interlayer Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 26
- 238000005086 pumping Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000001745 non-dispersive infrared spectroscopy Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000246 remedial effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L51/00—Expansion-compensation arrangements for pipe-lines
- F16L51/02—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention belongs to the technical field of intelligent manufacturing, and particularly relates to an online leak detection corrugated pipe compensator and a leak detection method, wherein the compensator comprises an outer-layer corrugated pipe, an inner-layer corrugated pipe sleeved on the inner side of the outer-layer corrugated pipe, a vacuumizing device, an inflating device and a leak detection assembly, wherein two ends of the inner-layer corrugated pipe are respectively connected with a connecting pipe in a sealing manner, two ends of the outer-layer corrugated pipe are connected with the outer wall of the connecting pipe in a sealing manner through an annular plate, and a welding point of the annular plate and the connecting pipe is at a certain distance from a welding; the vacuumizing device, the inflating device and the leakage detection assembly are respectively connected with a sealing cavity formed by the outer-layer corrugated pipe and the inner-layer corrugated pipe through two annular plates. The invention can realize that the corrugated pipe compensator can be used safely temporarily no matter the corrugated pipe is an outer corrugated pipe or an inner corrugated pipe and the annular fillet weld of the corrugated pipe and the connecting pipe has a leakage point, and meanwhile, the use safety performance is ensured by prompting, checking and maintaining through remote online alarming.
Description
Technical Field
The invention belongs to the technical field of intelligent manufacturing, and particularly relates to an online leak detection corrugated pipe compensator and a leak detection method.
Background
The core element of the corrugated pipe compensator is a single-layer or multi-layer stainless steel corrugated pipe, and displacement compensation in all directions is performed on the pipeline through the expansion and the bending of the corrugated pipe. In reality, once the working medium in the pipe leaks, economic loss or personnel injury can be caused, so that measures for preventing the leakage of the corrugated pipe compensator are necessary, and the use safety of the corrugated pipe compensator is improved.
Referring to fig. 1 and 2, a conventional corrugated pipe compensator with an alarm device is generally formed by laminating double corrugated pipes, nitrogen is filled between layers, and a pressure gauge is arranged to detect pressure changes between layers of the corrugated pipe to determine whether inner layer leakage occurs in the corrugated pipe. Although the mode is economical, the double-layer corrugated pipe is welded with the connecting pipe after being sealed and welded, the double-layer corrugated pipe shares a girth weld at the same position, and the potential safety hazard is as follows: the large probability leak source determined by whether the pressure is loaded or not is generated at the position of the circumferential fillet weld joint of the connecting pipe and the corrugated pipe, and the leak source is generated at the relatively small probability of the closed circumferential weld joint between the corrugated pipe layers. When a leakage point appears on the circumferential fillet weld of the connecting pipe and the corrugated pipe, the medium in the pipe leaks from the wall surface of the corrugated pipe and the connecting pipe, and the pressure gauge cannot give an early warning when the sealing circumferential weld between the corrugated pipe layers is intact.
Disclosure of Invention
In order to solve the technical problems, the invention provides an online leak detection corrugated pipe compensator and a leak detection method, which can monitor whether the corrugated pipe compensator leaks or not in real time from the pressure test of a system after the installation of a pipe network to the long-term working state, can continue to operate safely after the leakage is reported online, and provide sufficient decision and maintenance time for a pipe network manager.
The invention is realized in this way, provide a kind of online leak hunting compensator for corrugated pipe, including outer corrugated pipe, inner corrugated pipe, evacuating device, aerating device and leak detection assembly that cup joints in the outer corrugated pipe inboard, both ends of the inner corrugated pipe are connected with the takeover sealingly respectively, both ends of the outer corrugated pipe are connected with the outer wall of the takeover sealingly through the annular plate, and there is certain distance between the welding point of the inner corrugated pipe and the takeover and the welding point of the annular plate and the takeover; the vacuumizing device, the inflating device and the leakage detection assembly are respectively connected with a sealing cavity formed by the outer-layer corrugated pipe and the inner-layer corrugated pipe through two annular plates.
Preferably, the vacuum pumping device is a vacuum pump, the vacuum pump passes through the annular plate through a vacuum pumping pipeline and is connected with a sealed cavity formed by the outer-layer corrugated pipe and the inner-layer corrugated pipe, and a vacuum pumping valve is arranged on the vacuum pumping pipeline.
Preferably, the inflation device is air source equipment, the air source equipment penetrates through the annular plate through an inflation pipeline to be connected with a sealing cavity formed by the outer-layer corrugated pipe and the inner-layer corrugated pipe, and an inflation valve is arranged on the inflation pipeline.
Further preferably, the gas flushed into the sealed cavity formed by the outer-layer corrugated pipe and the inner-layer corrugated pipe by the gas source device is carbon dioxide.
Preferably, the leakage detection assembly comprises a gas sensor, a data processor and a display output device which are connected in sequence, and the gas sensor penetrates through the annular plate through a detection branch pipe to be connected with a sealed cavity formed by the outer-layer corrugated pipe and the inner-layer corrugated pipe.
Further preferably, the gas sensor is an NDIR infrared CO2 sensor.
Further preferably, the leak detection assembly further comprises an alarm.
Further preferably, the vacuum extractor and the inflator are connected to different positions of the same annular plate, and the leak detection assembly is connected to the other annular plate.
The invention also provides a method for detecting leakage by using the online leakage detection corrugated pipe compensator, which comprises the following steps:
1) and (3) air tightness detection: performing air tightness detection on the interlayer of the outer corrugated pipe and the inner corrugated pipe and the whole compensator;
2) calibrating and debugging the leakage detection assembly;
3) opening the vacuumizing device, evacuating air in a sealed cavity formed by the outer-layer corrugated pipe and the inner-layer corrugated pipe, and closing the vacuumizing device;
4) starting the air charging device, charging detection gas into a sealed cavity formed by the outer-layer corrugated pipe and the inner-layer corrugated pipe until the pressure in the cavity is higher than the pressure of a working medium in the connecting pipe, and closing the air charging device;
5) through the leakage detection assembly, the concentration change of the detected gas is observed in real time and recorded, and the leakage rate of the detected gas is calculated.
Preferably, the detection gas is CO2Said leak detection assembly comprising a CO2Sensor, CO2The leak rate is calculated by the formula:
Q＝(ρ2-ρ1)×V×60/(t×106)
where ρ is1Carbon dioxide concentration value at the beginning of the detection in the chamber, ml/m3；
ρ2-concentration value at the end of detection within the cavity;
v is the volume between the outer layer corrugated pipe and the inner layer corrugated pipe, and ml;
t-detection time, s.
Compared with the prior art, the invention has the advantages that:
because the welding spot of the inner corrugated pipe and the connecting pipe is positioned at the inner side of the welding spot of the outer corrugated pipe and the connecting pipe, no matter the outer corrugated pipe or the inner corrugated pipe and the circumferential fillet weld of the corrugated pipe and the connecting pipe have leakage points, the corrugated pipe compensator can be used safely temporarily, and meanwhile, the remote end online alarm prompts the inspection and the maintenance to ensure the use safety performance.
Drawings
The invention is described in further detail below with reference to the following figures and embodiments:
FIG. 1 is a schematic view of a conventional alarm structure showing leakage;
FIG. 2 is an enlarged structural view of the position of a welding spot in FIG. 1;
FIG. 3 is a block diagram of an online leak detection bellows compensator provided by the present invention;
fig. 4 is a connection pipe medium direction diagram when the online leak detection corrugated pipe compensator provided by the invention leaks.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples of the following,
Referring to fig. 3 and 4, the invention provides an online leak detection corrugated pipe compensator, which comprises an outer-layer corrugated pipe 1, an inner-layer corrugated pipe 2, a connecting pipe 3, two annular plates 4, a vacuum pump 5, a vacuumizing valve 6, an air source 7, an inflation valve 8, a gas sensor 9, a data processor 10 and a display output device 11. The design of the corrugated pipe compensator adopts an annular plate 4 to build a three-dimensional cavity structure. The straight edge section of the outer corrugated pipe 1 is welded with the outer side of the annular plate 4, the straight edge section of the inner corrugated pipe 2 is welded with the connecting pipe 3, and a sealing cavity is formed between the outer corrugated pipe 1 and the inner corrugated pipe 2. And a detection branch pipe is welded on the annular plate 4 at one end, and the outer end of the detection branch pipe is matched with the detection end interface of the gas sensor 9 and is provided with the gas sensor 9. Two pipelines are led out from the annular plate 4 at the other end to the outside. One pipeline is provided with an inflation valve 8 connected with an air source device 7, the other pipeline is connected with a vacuum pump 5, and a vacuum pumping valve 6 is arranged on the vacuum pumping pipeline. Gas is filled into the cavity between the layers of the corrugated pipe through the gas source device 7 and the vacuum pump 5, the gas sensor 9 is used for monitoring the concentration change of the gas between the layers to judge whether the corrugated pipe leaks, and the leakage rate is used as the judgment basis. The gas sensor 9 measures data and transmits the data to the field data processing device 10, and the data are wirelessly transmitted to the remote display output device 11, so that the leakage rate is reported in real time, and whether the corrugated pipe compensator leaks or not is monitored on line.
Specifically, the method for detecting the leak by using the online leak detection corrugated pipe compensator comprises the following steps:
1) firstly, carrying out an air tightness test, including carrying out air tightness inspection on the corrugated pipe layers and the whole device;
2) second calibration of CO2The gas sensor 9, the debugging data processor 10 and the display output device 11;
3) confirming no problem, starting a vacuum pump 6, evacuating air between corrugated pipe layers of the compensator, and closing a vacuumizing valve 6;
4) the inflation valve 8 is opened, pure CO is filled between the corrugated pipe layers2Gas, CO for maintaining the pressure between layers 1.2 times of the pressure of the working medium in the connecting pipe 32Closing the charging valve 8;
5) on-line monitoring of interlayer CO by observation display output device 112And (4) recording the value of the gas concentration. When the device is installed on site, the corrugated pipe compensator is firstly installed, then the gas sensor and the matched online monitoring equipment are installed, and CO between corrugated pipe layers is observed in real time2The concentration changes. According to CO2And (3) obtaining a detected leakage rate formula according to the properties of the gas sensor:
Q＝(ρ2-ρ1)×V×60/(t×106)
in the formula: rho1-carbon dioxide concentration value at the start of detection in the detection vessel, ml/m3；
ρ2Concentration value at the end of detection;
v-volume between corrugated pipe layers, ml;
t-detection time, s;
q-leak rate, ml/min.
The volume between the layers of the corrugated pipe can be calculated by SolidWorks software, and the initial compensator approximate volume between the layers of the corrugated pipe replaces CO2The volume of gas. According to the ISO10297-2014 Gas resins-resins values-specifications and type testing standard, the airtightness test requires that no more than 6ml/h is leakproof, so that the detection container is considered to be leakless. When the appearance of CO between the layers of the corrugated pipe is monitored2When the leakage rate is more than 6ml/h and the concentration is gradually reduced, the remote output display device starts to alarm to indicate that the outer layer or the inner layer of the corrugated pipe compensator has leakage, the corrugated pipe compensator at the position is checked, and remedial measures are taken.
In the online leak detection corrugated pipe compensator provided by the invention, the gas sensor 9 adopts NDIR infrared CO from the aspects of measurement reliability and accuracy2A sensor. The core of the sensor is a dual-channel sensor, wherein a carbon dioxide channelFor measuring the gas concentration and another reference channel for the gas sensor 9 signal strength. The method has the advantages of wide detection range, small zero drift, high sensitivity, no need of heating, quick response to leakage and capability of realizing continuous detection.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. The online leakage detection corrugated pipe compensator is characterized by comprising an outer-layer corrugated pipe (1), an inner-layer corrugated pipe (2) sleeved on the inner side of the outer-layer corrugated pipe (1), a vacuumizing device, an inflating device and a leakage detection assembly, wherein two ends of the inner-layer corrugated pipe (2) are respectively in sealing connection with a connecting pipe (3), two ends of the outer-layer corrugated pipe (1) are in sealing connection with the outer wall of the connecting pipe (3) through an annular plate (4), and a welding point of the annular plate (4) and the connecting pipe (3) has a certain distance from a welding point of the inner-layer corrugated pipe (2) and the connecting pipe (3); the vacuumizing device, the inflating device and the leakage detection assembly are respectively connected with a sealed cavity formed by the outer-layer corrugated pipe (1) and the inner-layer corrugated pipe (2) through two annular plates (4).
2. The bellows compensator of online leak detection according to claim 1, wherein the evacuation device is a vacuum pump (5), the vacuum pump (5) is connected to the sealed cavity formed by the outer bellows (1) and the inner bellows (2) through the annular plate (4) by an evacuation line, and an evacuation valve (6) is provided on the evacuation line.
3. The online leaky bellows compensator as claimed in claim 1, wherein said inflation means is an air supply device (7), said air supply device (7) is connected to the sealed cavity formed by said outer bellows (1) and said inner bellows (2) by an inflation line passing through said annular plate (4), and an inflation valve (8) is provided on said inflation line.
4. Bellows compensator for online leak detection according to claim 3, characterized in that the gas flushed by the gas source device (7) into the sealed cavity formed by the outer bellows (1) and the inner bellows (2) is carbon dioxide.
5. The bellows compensator of online leak detection as set forth in claim 1, wherein the leak detection assembly comprises a gas sensor (9), a data processor (10) and a display output device (11) connected in sequence, the gas sensor (9) is connected with the sealed cavity formed by the outer bellows (1) and the inner bellows (2) through the annular plate (4) by a detection branch.
6. The on-line leak detection bellows compensator of claim 5, wherein the gas sensor is a non-dispersive infrared CO2A sensor.
7. The bellows compensator of online leak detection as set forth in claim 5, wherein the leak detection assembly further comprises an alarm.
8. Bellows compensator for online leak detection according to claim 1, wherein said evacuation means and said inflation means are connected at different locations on the same annular plate (4), and said leak detection assembly is connected to the other annular plate (4).
9. A method of leak detection using the online leak detection bellows compensator of claim 1, comprising the steps of:
1) and (3) air tightness detection: performing air tightness detection on the interlayer of the outer corrugated pipe (1) and the inner corrugated pipe (2) and the whole compensator;
2) calibrating and debugging the leakage detection assembly;
3) opening the vacuumizing device, evacuating air in a sealed cavity formed by the outer-layer corrugated pipe (1) and the inner-layer corrugated pipe (2), and closing the vacuumizing device;
4) starting the inflation device, filling detection gas into a sealed cavity formed by the outer-layer corrugated pipe (1) and the inner-layer corrugated pipe (2) until the pressure in the cavity is higher than the pressure of working media in the connecting pipe (3), and closing the inflation device;
5) through the leakage detection assembly, the concentration change of the detected gas is observed in real time and recorded, and the leakage rate of the detected gas is calculated.
10. The method of leak detection using an in-line leak detection bellows compensator of claim 9 wherein the test gas is CO2Said leak detection assembly comprising a CO2Sensor, CO2The leak rate is calculated by the formula:
Q＝(ρ2-ρ1)×V×60/(t×106)
where ρ is1Carbon dioxide concentration value at the beginning of the detection in the chamber, ml/m3；
ρ2-concentration value at the end of detection within the cavity;
v is the interlayer volume of the outer-layer corrugated pipe (1) and the inner-layer corrugated pipe (2), and is ml;
t-detection time, s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010652641.0A CN111664311A (en) | 2020-07-08 | 2020-07-08 | Online leakage detection corrugated pipe compensator and leakage detection method |
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| CN202010652641.0A CN111664311A (en) | 2020-07-08 | 2020-07-08 | Online leakage detection corrugated pipe compensator and leakage detection method |
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Cited By (4)
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| CN112097000A (en) * | 2020-10-26 | 2020-12-18 | 南京晨光东螺波纹管有限公司 | Online leakage detection corrugated pipe compensator applied to high-temperature occasions and leakage detection method |
| CN112128504A (en) * | 2020-09-30 | 2020-12-25 | 洛阳双瑞特种装备有限公司 | Bellows expansion joint with leak safeguard function |
| CN113623549A (en) * | 2021-08-11 | 2021-11-09 | 南通曙光机电工程有限公司 | Vacuum compensator with leakage automatic alarm device |
| CN118150066A (en) * | 2024-05-10 | 2024-06-07 | 中铁六局集团有限公司 | Device and method for detecting leakage in narrow space at joint of large pipeline |
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Cited By (4)
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