CN110578872A - System and method for monitoring non-metal pipeline leakage - Google Patents
System and method for monitoring non-metal pipeline leakage Download PDFInfo
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- CN110578872A CN110578872A CN201910804807.3A CN201910804807A CN110578872A CN 110578872 A CN110578872 A CN 110578872A CN 201910804807 A CN201910804807 A CN 201910804807A CN 110578872 A CN110578872 A CN 110578872A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 202
- 229910052755 nonmetal Inorganic materials 0.000 title claims abstract description 33
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- 238000004458 analytical method Methods 0.000 claims abstract description 34
- 238000004891 communication Methods 0.000 claims abstract description 32
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- 238000002844 melting Methods 0.000 claims description 12
- 230000008018 melting Effects 0.000 claims description 12
- 241001089723 Metaphycus omega Species 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 7
- 239000004033 plastic Substances 0.000 claims description 6
- 229920003023 plastic Polymers 0.000 claims description 6
- 238000004080 punching Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 9
- 238000010998 test method Methods 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
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- 238000004088 simulation Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
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- 238000012423 maintenance Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
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- 241001391944 Commicarpus scandens Species 0.000 description 1
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- 239000012736 aqueous medium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
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- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
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- 239000007788 liquid Substances 0.000 description 1
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Classifications
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- 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
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
- G01M3/18—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
the invention relates to a pipeline leakage monitoring technology, and aims to provide a system and a method for monitoring non-metal pipeline leakage. The system comprises a resistance value detection module, an axial monitoring electrode and a circumferential monitoring electrode, wherein the axial monitoring electrode is axially arranged right below the outer side of the pipeline, and the circumferential monitoring electrode is arranged on the wall of the pipeline and can be contacted with a conveying medium; one end of the axial monitoring electrode is sequentially connected with the resistance value detection module and the annular monitoring electrode through a lead, and the annular monitoring electrode and a wiring terminal thereof are insulated from the axial monitoring electrode and the pipeline installation environment; the resistance value detection module is connected with the communication module through a signal wire, the communication module is connected with the leakage analysis module in a wired or wireless communication mode, and the leakage analysis module is used for judging whether pipeline leakage occurs according to the change of resistance monitoring data uploaded by the communication module. The detection equipment adopted by the invention is simple, complex detection equipment is not needed, the test method is easy to realize, and the cost of monitoring the leakage of the non-metal pipeline is reduced.
Description
Technical Field
The invention relates to a pipeline leakage monitoring technology, in particular to a system and a method for monitoring non-metal pipeline leakage.
Background
The pipeline is the core facility for energy and water delivery, and is the life line vital to national economic development and human survival. With the adjustment of energy structures in China and the acceleration of urbanization processes, nonmetal pipelines are widely applied to national major projects, such as high-pressure jumper pipes in the fields of mudflats and shallow sea petroleum industry, gas conveying pipelines in urban gas pipe networks, cooling water circulating pipelines in nuclear power plants, and ideal substitutes for oil well water injection pipes and shallow sea medium-low pressure marine hoses. China has become the country with the largest non-metal pipeline yield and demand, and the application prospect is very wide.
the nonmetal pipeline has wide application occasions, complex and severe service environment and is easy to be subjected to external loads generated by terrain change and natural disasters. In actual use, resource waste and safety accidents caused by the leakage of the non-metal pipeline occur continuously. According to statistics, the water loss of the urban water supply network in China reaches 21.5 percent, and the water loss of some northern cities even reaches about 40 percent. Wherein the water loss caused by the leakage of the pipeline accounts for about 50 percent, which causes serious water resource waste. The non-metal pipeline for oil and gas transmission has high pressure and large caliber, and the leakage of the pipeline not only causes power waste and environmental pollution, but also threatens the life and property safety of people.
In order to solve the problems of resource waste and safety accidents caused by pipeline leakage, a pipeline leakage monitoring system needs to be built to monitor the leakage state of the pipeline in real time, find and eliminate hidden troubles of pipeline leakage as soon as possible, reduce the operation and maintenance cost of the pipeline, reduce the waste of resources, and improve the safety and the service life of the pipeline. The current pipeline leakage monitoring method mainly comprises the following steps: acoustic wave detection techniques and fiber optic detection techniques. The acoustic detection technology is used for monitoring and positioning leakage according to the propagation rule of acoustic waves in a medium. For a metal pressure pipeline, once the pipeline leaks, a medium flows out from a leakage point at a certain speed due to the action of the pressure difference between the inside and the outside of the pipeline to form jet flow, so that sound waves are generated at the leakage point. The method has been successfully applied to metal pipelines, but in non-metal pipelines, the attenuation speed of sound waves in non-metal (plastic) materials is high, the propagation distance is short, and the system construction cost is high. The method is greatly interfered by external noise, and more false alarms are generated, so that the acoustic wave detection technology cannot be applied to leakage of the non-metal pipeline. In the optical fiber detection technology, because optical fiber signals are difficult to decouple under the influence of temperature and strain factors, and optical fiber materials are easy to break and need special maintenance, the application of the optical fiber detection technology is limited. Therefore, an effective leakage monitoring technology is not available in the leakage monitoring of the non-metal pipeline.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and provides a system and a method for monitoring the leakage of a non-metal pipeline.
In order to solve the technical problems, the invention adopts the following solution:
The system for monitoring the leakage of the non-metal pipeline comprises a resistance value detection module; further comprising: the device comprises an axial monitoring electrode and a circumferential monitoring electrode, wherein the axial monitoring electrode is axially arranged right below the outer side of the pipeline, the circumferential monitoring electrode is arranged on the wall of the pipeline and can be contacted with a conveying medium, one end of the axial monitoring electrode is sequentially connected with a resistance value detection module and the circumferential monitoring electrode through a lead, and the circumferential monitoring electrode and a wiring terminal of the circumferential monitoring electrode are insulated from the axial monitoring electrode and the pipeline installation environment; the resistance value detection module is connected with the communication module through a signal wire, the communication module is connected with the leakage analysis module in a wired or wireless communication mode, and the leakage analysis module is used for judging whether pipeline leakage occurs according to the change of resistance monitoring data uploaded by the communication module. (the pipeline installation environment refers to the condition that the pipeline is laid in soil or other media, and insulation between the annular monitoring electrode and the terminal thereof and the soil or other media is ensured at the moment.)
in the invention, the axial monitoring electrode is a strip electrode, a linear electrode or a plate electrode.
In the invention, the axial monitoring electrode is fixed right below the outer side of the pipeline in a gluing mode; or the axial monitoring electrode is directly laid right below the pipeline, and the distance between the axial monitoring electrode and the pipeline is not more than 0.5 m.
in the invention, the annular monitoring electrode is arranged at any annular position with the axial distance from the wiring terminal of the axial monitoring electrode within the range of 0-50 cm.
In the invention, the annular monitoring electrode is a strip electrode, a linear electrode, a plate electrode or a cylindrical electrode.
in the invention, the annular monitoring electrode is fixed on the pipeline wall by any one of the following modes:
(1) Fixing the annular monitoring electrode inside the bolt with the inner hole, and then sealing the inner hole; punching a hole in the wall of the pipeline, and installing a bolt into the hole;
(2) the annular monitoring electrode is embedded in the inner side of the pipeline wall and is communicated with an internal lead of the electric melting pipe fitting embedded with the resistance wire;
(3) The annular monitoring electrode is fixed on the inner side of the pipeline wall in a hot melting welding mode;
(4) the wall of the pipeline is perforated, an annular monitoring electrode is inserted into the inner side of the exposed pipeline wall through the hole, and the hole is sealed by melting plastic through a hot melting gun.
The system comprises a plurality of parallel subsystems, wherein each subsystem comprises a group of axial monitoring electrodes, a ring-shaped monitoring electrode, a resistance value detection module and a communication module which are respectively connected to a leakage analysis module through the communication module; the axial monitoring electrodes in each subsystem are sequentially arranged end to end, and corresponding annular monitoring electrodes are arranged at any annular position within the range of 0-50 cm away from the axial distance of the wiring end of the axial monitoring electrode.
the invention further provides a method for monitoring the leakage of the non-metal pipeline based on the system, which comprises the following steps: the resistance value detection module detects the resistance value between the axial monitoring electrode and the annular monitoring electrode in real time and transmits resistance value data to the leakage analysis module through the communication module; the leakage analysis module receives the measured resistance value RmWith a predetermined characteristic value Rscomparing; if R ism>RsThe pipeline system has no leakage; if R ism<RsLeakage exists in the pipeline system; if leakage exists, the leakage analysis module sends out warning prompt while outputting the monitoring resultThere is a leak.
In the invention, under the condition of a plurality of parallel subsystems, the leakage analysis module sends out a warning to prompt that the corresponding subsystem has leakage while outputting a monitoring result, thereby confirming that a leakage point belongs to a certain specific pipe section.
in the present invention, the preset characteristic value RsThe value is determined in any one of the following ways:
(1) Characteristic value RsIs the insulation resistance of the non-metal pipeline to be monitored;
(2) After the non-metal pipeline and the monitoring system are installed, measuring the resistance value of the monitoring system by using a high resistance meter, and taking 10% of the measured resistance as a characteristic value Rs；
(3) For the SDR11 PE100 gas pipeline with the wall thickness exceeding 10mm, a characteristic value R is takensIs 200 M.OMEGA..
description of the inventive principles:
The surface material of the non-metal pipeline is an insulating material, when the pipeline does not leak, the axial monitoring electrode arranged along the axial direction of the pipeline and the annular monitoring electrode inserted into the pipeline are in an insulating state, and the resistance value measured by the resistance value detection module is very large and is usually more than 1000M omega. When the pipeline leaks, the leaked part of fluid flows to the axial monitoring electrode below the pipeline along the outer wall surface of the pipeline, and because fluid media such as water have conductivity, the fluid in the pipeline and the leaked fluid enable the axial monitoring electrode and the annular monitoring electrode to be conducted to form a loop, the resistance value measured by the resistance value detection module is obviously reduced, and the leakage of the media generated by the pipeline is monitored. The resistance value signal measured by the resistance value detection module is transmitted to the leakage analysis module through the communication module, and the leakage analysis module judges whether pipeline leakage occurs according to the change of the received resistance value.
Because the resistance value measured by the resistance value detection module can be obviously reduced when the pipeline leaks, in order to judge whether the pipeline leaks, a characteristic value R needs to be setsA resistance value R measured by the resistance value detection modulemAnd the characteristic value RsIn contrast, when the resistance value R ismgreater than the characteristic value RsWhen the pipeline is not leaked, the pipeline is considered to be not leaked; when the resistance value R ismless than the characteristic value RsWhen a leak occurs in a pipe, the characteristic value R can be generally usedsthe insulation resistance of the nonmetal pipeline to be monitored can be set, or the insulation resistance can be measured by adopting a high resistance meter after the plastic pipeline and the monitoring system are installed, and 10 percent of the measured resistance is taken as a characteristic value RsFor SDR11 PE100 gas pipeline with wall thickness of 10mm, R can be takensIs 200 M.OMEGA..
In the invention, when the axial monitoring electrode is fixed on the outer wall surface of the pipeline in an adhesive mode, the electrode is arranged at the lowest position of the outer wall surface of the pipeline; or when the axial monitoring electrode is directly laid along the pipeline, the electrode should be arranged right below the pipeline; after the installation is finished, good insulativity between the annular monitoring electrode and the annular monitoring electrode is ensured. Therefore, when the pipeline leaks at any position in the annular direction, the leaked part of fluid flows to the axial monitoring electrode below the pipeline along the outer wall surface of the pipeline, the axial monitoring electrode and the annular monitoring electrode are conducted to form a loop by the fluid leaked from the pipeline and the fluid in the pipeline, the resistance value measured by the detection circuit is obviously reduced, and the medium leakage generated by the pipeline is monitored.
In the invention, the axial monitoring electrode, the annular monitoring electrode, the resistance value detection module and the communication module can form a subsystem. Such subsystems may be arranged in plurality along the pipeline segment, each subsystem being responsible for pipeline leakage monitoring within its range of arrangement to accommodate the accuracy requirements of pipeline system leakage monitoring. The leakage analysis module can simultaneously receive monitoring data transmitted by a plurality of leakage monitoring subsystems, judge whether pipeline leakage occurs or not according to the received resistance value and judge which pipeline section the leakage point belongs to is covered by which leakage monitoring subsystem.
Compared with the prior art, the invention has the beneficial effects that:
(1) the traditional sound wave and optical fiber detection technology is difficult to be applied to leakage monitoring of the non-metal pipeline, and the monitoring system and the monitoring method based on the resistance can effectively monitor the leakage of the fluid medium generated in the non-metal pipeline system, so that the problem of difficulty in leakage monitoring of the non-metal pipeline is solved.
(2) The leakage monitoring system disclosed by the invention can be arranged along the pipeline in sections according to the pipeline monitoring precision requirement, and each system is responsible for pipeline leakage monitoring in the arrangement range and adapts to the precision requirement of pipeline system leakage monitoring.
(3) compared with other leakage monitoring technologies, the leakage monitoring method has the advantages that the adopted detection equipment is simple, complex detection equipment is not needed, the testing method is easy to realize, and the cost of non-metal pipeline leakage monitoring is reduced.
Drawings
FIG. 1 is a schematic diagram of the structure and principle of the system of the present invention;
FIG. 2 is a flow chart of leak determination according to the present invention;
FIG. 3 is a schematic diagram of a leak test in an embodiment.
Reference numerals: 1, a non-metal pipeline; 2, a circumferential monitoring electrode; 3 axial monitoring electrode; 4 a resistance value detection module; 5, a communication module; 6 a leak analysis module.
Detailed Description
It should be noted that, in the implementation process of the present invention, the application of the software functional module is involved. For example, the leakage analysis module in the invention is a hardware product with calculation function, the optional equipment comprises a single chip microcomputer, a PLC module, a computer and the like, and the analysis and calculation function is realized by a software function module embedded or installed in the equipment. The applicant believes that it is fully possible for one skilled in the art to utilize the software programming skills in his or her own practice to implement the invention, as well as to properly understand the principles and objectives of the invention, in conjunction with the prior art, after a perusal of this application. All references made herein are to the extent that they do not constitute a complete listing of the applicants.
The accompanying drawings show various schematic diagrams of the non-metallic pipeline monitoring system and method of the present invention. Wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of the respective components and the relative sizes and positional relationships therebetween shown in the drawings are merely exemplary.
The system for monitoring the leakage of the non-metallic pipeline is shown in figure 1 and comprises a resistance value detection module 4, an axial monitoring electrode 3 which is axially arranged right below the outer side of the non-metallic pipeline 1 and a circumferential monitoring electrode 2 which is arranged on the wall of the pipeline and can be contacted with a conveying medium, wherein one end of the axial monitoring electrode 3 is sequentially connected with the resistance value detection module 4 and the circumferential monitoring electrode 2 through a lead, and the circumferential monitoring electrode 2 and the axial monitoring electrode 3 are insulated from each other; the resistance value detection module 4 is connected with a communication module 5 through a signal wire, and the communication module is connected with a leakage analysis module 6 in a wired or wireless communication mode; and the leakage analysis module 6 is used for judging whether pipeline leakage occurs according to the change of the resistance monitoring data uploaded by the communication module 5.
The system can comprise a plurality of parallel subsystems, the subsystems can be arranged along the pipeline sections, and each system is responsible for pipeline leakage monitoring within the arrangement range of the subsystem so as to meet the precision requirement of pipeline system leakage monitoring. Each subsystem comprises a group of axial monitoring electrodes 3, a group of annular monitoring electrodes 2, a resistance value detection module 4 and a communication module 5, and the axial monitoring electrodes, the annular monitoring electrodes, the resistance value detection module 4 and the communication module 5 are respectively connected to a leakage analysis module 6 through the communication module 5; the axial monitoring electrodes 3 in each subsystem are sequentially arranged end to end, and corresponding annular monitoring electrodes 2 are arranged at any annular position within the range of 0-50 cm away from the axial distance of the wiring end of the axial monitoring electrode 3.
The axial monitoring electrode 3 can be a strip electrode, a linear electrode or a plate electrode and is fixed right below the outer side of the pipeline in an adhesive mode; or the axial monitoring electrode 3 is directly laid right below the pipeline, and the distance between the axial monitoring electrode and the pipeline is not more than 0.5 m. The annular monitoring electrode 2 can be a strip electrode, a linear electrode, a plate electrode or a cylindrical electrode and is arranged at any annular position with the axial distance from the wiring end of the axial monitoring electrode 3 within the range of 0-50 cm. The arrangement mode can be any one of the following modes: (1) the annular monitoring electrode 2 is fixed inside the bolt with the inner hole, and then the inner hole is sealed; punching a hole in the wall of the pipeline, and installing a bolt into the hole; (2) the annular monitoring electrode 2 is embedded in the inner side of the pipeline wall and is communicated with an internal lead of the electric melting pipe fitting embedded with the resistance wire; (3) the annular monitoring electrode 2 is fixed on the inner side of the pipeline wall in a hot melting welding mode; (4) the pipe wall is perforated, the annular monitoring electrode 2 is inserted through the hole until the inner side of the pipe wall is exposed, and then the hole is sealed by melting plastic with a hot melting gun.
The resistance value detection module 4 is connected with the two monitoring electrodes and measures the resistance value between the two monitoring electrodes. When the non-metal pipeline 1 leaks, the two monitoring electrodes are conducted by the leaked liquid medium to form a loop, and the resistance value measured by the resistance value detection module 4 is obviously reduced; the resistance value detection module 4 can select commercially available resistance measurement products (such as a multimeter or a high-impedance meter with the range of 5-10M omega), and can also package a simple resistance measurement circuit as the resistance value detection module 4; even the resistance measuring circuit and the communication module can be packaged in one hardware device together, so that the cost of hardware products is reduced, and the installation procedure is reduced.
A method of monitoring a non-metallic conduit for leakage, comprising: the resistance value detection module 4 detects the resistance value between the axial monitoring electrode 3 and the annular monitoring electrode 2 in real time, and transmits resistance value data to the leakage analysis module 6 through the communication module 5; the leakage analysis module 6 measures the received resistance value RmWith a predetermined characteristic value RsComparing; if R ism>RsThe pipeline system has no leakage; if R ism<Rsleakage exists in the pipeline system; the characteristic value R can be generally setsThe insulation resistance of the nonmetal pipeline to be monitored can be set, or the insulation resistance can be measured by adopting a high resistance meter after the plastic pipeline and the monitoring system are installed, and 10 percent of the measured resistance is taken as a characteristic value RsFor SDR11 PE100 gas pipeline with wall thickness of 10mm, R can be takensIs 200 M.OMEGA.. If leakage exists, the leakage analysis module 6 outputs a monitoring result and simultaneously gives out a warning to indicate that leakage exists. Under the condition that a plurality of parallel subsystems are provided, the leakage analysis module 6 sends out a warning to prompt that the corresponding subsystem leaks while outputting a monitoring result, so that a leakage point is confirmed to belong to a certain specific pipe section.
Fig. 1 illustrates the monitoring principle of the present invention. The surface material of the non-metal pipeline 1 is an insulating material, when the pipeline does not leak, the axial monitoring electrode 3 arranged along the axial direction of the pipeline and the annular monitoring electrode 2 inserted into the pipeline are in a non-conducting state, and the resistance value measured by the resistance value detection module 4 is very large and is usually more than 1000M omega. When the pipeline leaks, the leaked part of fluid flows to the axial monitoring electrode 3 below the pipeline along the outer wall surface of the pipeline, and because fluid media such as water have conductivity, the fluid in the pipeline and the leaked fluid enable the axial monitoring electrode 3 and the annular monitoring electrode 2 to be conducted to form a loop, the resistance value measured by the resistance value detection module 4 is obviously reduced to be below 10M omega, and therefore the medium leakage generated by the pipeline is monitored.
The resistance value signal measured by the resistance value detection module 4 is transmitted to the leakage analysis module 6 through the communication module 5, and the latter judges whether the pipeline leakage occurs according to the received resistance value.
fig. 2 shows a flow chart of leak analysis processing in the leak monitoring system of the present invention, comprising the steps of:
(1) the leakage analysis module 6 receives the measured resistance value R transmitted by the communication module 5m；
(2) The leakage analysis module 6 will measure the resistance value RmAnd a characteristic value RsComparing;
(3) If R ism>RsIf the pipeline system has no leakage, the monitoring system displays that the pipeline runs normally and has no leakage, and the step (6) is directly carried out to output the monitoring result;
(4) if R ism<RsIndicating that a leakage exists in the pipeline system;
(5) if the system has a plurality of leakage monitoring and data transmission systems, the leakage analysis module 6 confirms which pipe section the leakage point belongs to which leakage monitoring and data transmission system covers;
(6) Outputting a system monitoring result;
(7) And (4) returning to the step (1) to process the next measurement data.
The following examples are provided to more clearly illustrate the technical solutions of the present invention, and should not be construed as limiting the scope of the present invention. All of the measuring elements and material devices in the examples are available from published commercial sources.
The test pipeline is a DN110 high-density polyethylene pipeline, and the filling medium is water. The axial monitoring electrode 3 adopts a copper strip electrode, and the electrode is fixed at the lowest position of the outer wall surface of the non-metal pipeline 1 along the axial direction by adopting a pasting method. One is drilled at the position of the end part of the axial monitoring electrode 3 which rotates 180 degrees along the circular directionThe circumferential monitoring electrode 2 made of copper is inserted into the pipeline through the hole, so that the circumferential monitoring electrode 2 is in direct contact with fluid media in the pipeline, and the hole is sealed to prevent media leakage. The resistance value detection module 4 adopts a universal meter, is connected with the axial monitoring electrode 3 and the annular monitoring electrode 2 through leads, and measures the resistance value between the two monitoring electrodes.
The implementation case realizes monitoring according to the following steps:
(1) Arranging a monitoring electrode and a universal meter according to the arrangement shown in figure 1, wherein the medium filled in the pipeline is water;
(2) When the pipeline does not leak, a universal meter (the maximum measuring resistance is 200M omega) is adopted to measure the resistance value between the axial monitoring electrode 3 and the annular monitoring electrode 2, the measuring result shows that the resistance value exceeds the measuring range and is recorded as R0；
(3) As shown in fig. 3, a hole a is drilled at a position 100cm away from the annular monitoring electrode on the pipeline (the distance between the point a and the axial direction of the annular monitoring electrode), pipeline leakage is simulated, water leaking from the point a flows to the axial monitoring electrode 3 arranged at the lowest side of the pipeline along the outer wall surface of the pipeline, and the axial monitoring electrode 3 and the annular monitoring electrode 2 are connected by the leaked water and the water in the pipeline at the moment to form a conduction loop; measuring the resistance value between the axial monitoring electrode 3 and the annular monitoring electrode 2 by adopting a universal meter, and recording the measurement result as RA；
(4) After the point A is measured, sealing the point A by using glue to eliminate leakage;
(5) in the same way as above, the first and second,Drilling holes at points B and C respectively to generate water medium leakage and simulate pipeline leakage; the distance between the two points B, C and the resistance measured at the time of leakage were recorded as RBand RC；
(6) The resistance values when the pipe was not leaking and the distances of the A, B and C three leak simulation points and the measured resistance values when leaking were recorded as shown in Table 1; when leakage does not occur, the axial monitoring electrode 2 and the annular monitoring electrode 3 are in a disconnected state, and the resistance R is measured0Over range (>200M Ω); when leakage occurred, the resistance values measured at A, B and the three leakage simulation points C were 4.29 M.OMEGA., 3.06 M.OMEGA., and 2.14 M.OMEGA.
TABLE 1 distance of leakage simulation points and measured resistance value at the time of leakage
The test result of the simulated leakage experiment shows that after the pipeline leaks, the axial monitoring electrode 3 and the annular monitoring electrode 2 are connected together by the leaked aqueous medium to form a conduction loop, and the measured resistance value between the axial monitoring electrode 3 and the annular monitoring electrode 2 is obviously reduced; and the closer the leakage point is to the annular monitoring electrode, the smaller the measured resistance value is. Therefore, the pipeline leakage monitoring system and the pipeline leakage monitoring method can effectively monitor the fluid medium leakage generated by the non-metal pipeline, and solve the problem of non-metal pipeline leakage monitoring.
Claims (10)
1. A system for monitoring leakage of a non-metallic pipeline comprises a resistance value detection module; it is characterized by also comprising: the device comprises an axial monitoring electrode and a circumferential monitoring electrode, wherein the axial monitoring electrode is axially arranged right below the outer side of the pipeline, the circumferential monitoring electrode is arranged on the wall of the pipeline and can be contacted with a conveying medium, one end of the axial monitoring electrode is sequentially connected with a resistance value detection module and the circumferential monitoring electrode through a lead, and the circumferential monitoring electrode and a wiring terminal of the circumferential monitoring electrode are insulated from the axial monitoring electrode and the pipeline installation environment; the resistance value detection module is connected with the communication module through a signal wire, the communication module is connected with the leakage analysis module in a wired or wireless communication mode, and the leakage analysis module is used for judging whether pipeline leakage occurs according to the change of resistance monitoring data uploaded by the communication module.
2. The system of claim 1, wherein the axial monitoring electrode is a strip electrode, a wire electrode, or a plate electrode.
3. The system of claim 1, wherein the axial monitoring electrode is adhesively secured directly beneath the outside of the pipe; or the axial monitoring electrode is directly laid right below the pipeline, and the distance between the axial monitoring electrode and the pipeline is not more than 0.5 m.
4. The system of claim 1, wherein the circumferential monitoring electrode is disposed at any circumferential position having an axial distance from a terminal of the axial monitoring electrode in the range of 0-50 cm.
5. The system of claim 1, wherein the circumferential monitoring electrode is a strip electrode, a wire electrode, a plate electrode, or a cylindrical electrode.
6. The system of claim 1, wherein the circumferential monitoring electrode is affixed to the pipeline wall by any one of:
(1) fixing the annular monitoring electrode inside the bolt with the inner hole, and then sealing the inner hole; punching a hole in the wall of the pipeline, and installing a bolt into the hole;
(2) The annular monitoring electrode is embedded in the inner side of the pipeline wall and is communicated with an internal lead of the electric melting pipe fitting embedded with the resistance wire;
(3) The annular monitoring electrode is fixed on the inner side of the pipeline wall in a hot melting welding mode;
(4) the wall of the pipeline is perforated, an annular monitoring electrode is inserted into the inner side of the exposed pipeline wall through the hole, and the hole is sealed by melting plastic through a hot melting gun.
7. The system according to claim 1, wherein the system comprises a plurality of parallel subsystems, each subsystem comprises a group of axial monitoring electrodes, a group of circumferential monitoring electrodes, a resistance value detection module and a communication module, and the subsystems are respectively connected to the leakage analysis module through the communication module; the axial monitoring electrodes in each subsystem are sequentially arranged end to end, and corresponding annular monitoring electrodes are arranged at any annular position within the range of 0-50 cm away from the axial distance of the wiring end of the axial monitoring electrode.
8. The method for monitoring leakage of non-metallic pipes based on the system of claim 1, comprising: the resistance value detection module detects the resistance value between the axial monitoring electrode and the annular monitoring electrode in real time and transmits resistance value data to the leakage analysis module through the communication module; the leakage analysis module receives the measured resistance value RmWith a predetermined characteristic value RsComparing; if R ism>RsThe pipeline system has no leakage; if R ism<RsLeakage exists in the pipeline system; if leakage exists, the leakage analysis module outputs a monitoring result and simultaneously gives out a warning to indicate that leakage exists.
9. The method of claim 8, wherein in the case of a plurality of parallel subsystems, the leak analysis module outputs the monitoring result and simultaneously issues a warning to indicate that a leak exists in the corresponding subsystem, thereby confirming that the leak belongs to a specific pipe segment.
10. Method according to claim 8, characterized in that said preset characteristic value Rsthe value is determined in any one of the following ways:
(1) Characteristic value RsIs the insulation resistance of the non-metallic pipeline to be monitored;
(2) After the non-metal pipeline and the monitoring system are installed, measuring the resistance value of the monitoring system by using a high resistance meter, and taking 10% of the measured resistance as a characteristic value Rs；
(3) for SDR11 PE100 gas pipe with wall thickness exceeding 10mmTaking a characteristic value RsIs 200 M.OMEGA..
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| CN113008490A (en) * | 2021-02-02 | 2021-06-22 | 清华大学 | Leakage self-detection rubber sealing element, preparation method and leakage detection method |
| CN113465845A (en) * | 2021-06-21 | 2021-10-01 | 浙江大学 | Dynamic seal wear failure real-time detection method |
| CN114636039A (en) * | 2022-05-17 | 2022-06-17 | 浙江大学 | Self-sensing intelligent electric melting pipe fitting, flow and leakage detection system and method |
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