CN100491809C - Pipeline leakage predicting method - Google Patents
Pipeline leakage predicting method Download PDFInfo
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- CN100491809C CN100491809C CNB2005100942719A CN200510094271A CN100491809C CN 100491809 C CN100491809 C CN 100491809C CN B2005100942719 A CNB2005100942719 A CN B2005100942719A CN 200510094271 A CN200510094271 A CN 200510094271A CN 100491809 C CN100491809 C CN 100491809C
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Abstract
A pipeline prediction method includes the following steps: hygroscopic backing material is wound or bundled up at detected part of pipeline. The said hygroscopic backing material can effectively absorbing leaked liquid from pipeline, testing line is wound around the same hygroscopic backing material, the said testing wire includes conducting wire connector, a pair of conductors installed on the conducting wire connector separately and parallelly. Detecting the change of electrical parameter between a pair of the conductors for determining leakage state of pipeline and according to amplitude of the impedance change to determine the degree of pipeline leakage, pipeline leakage prediction is realized.
Description
Technical field
The present invention relates to a kind of pipeline leakage predicting method.
Background technique
Along with the development of intelligent building, the number of devices for satisfying the environmental conditions requirement that is provided with under construction is more and more, corresponding, and various number of tubes also just increase thereupon.Yet, pipeline is because aging, burn into wearing and tearing, tube wall fatigue etc. are former thereby leakage takes place be difficult to avoid, particularly because these pipelines (for example heating refrigeration pipeline, daily water consumption pipeline, fire-fighting water pipeline etc.) are distributed between the corner, floor interlayer in room or the comparatively hidden place of underfloor mostly, small-scale pipe leakage is difficult in time be found, so pipe leakage becomes one of main hidden danger of Environmental security.
At present, the method for pipeline leakage testing mainly contains two classes: directly leak detecting and leak detecting indirectly.Direct leak detecting mainly adopts method (as laying humidity transducer, diversion switch etc. the being installed) liquid that direct detection leaks of physics or chemistry, and the liquid that all is based on leakage as Chinese patent 94204155.0 and 94226766.4 etc. directly triggers sensor and implements detection; Indirectly leak detecting is meant that the variation of physical state parameters such as the flow that causes according to pipe leakage, pressure, sound implements to measure, and its main method has: negative pressure wave method, mass balance method, real-time model method, pressure gradient method, stress wave, sonic method etc.Detection device or equipment based on indirect leak detecting are more, all belong to this class as Chinese patent 96121000.1,99107241.3,02235420.4 and 2005100220194.2 etc.But these detecting methods mainly design at the characteristics of long-distance transmission pipeline, are not suitable for the Leak testtion to interior conduit.
Leak testtion to interior conduit should adopt direct Detection Method, and except above-mentioned several direct Detection Method, at present method commonly used also has following several in engineering: 1. electric pole type detection method or point type detection method.It adopts and leaks the liquid that electrode is responded to leakage, and detection device sends alarm signal after the liquid that leaks soaks electrode; 2. respond to the cable detection method.The used cable of this method has two classes: common induction cable and special-purpose induction cable.Adopting common induction cable to detect, is that the induction cable is laid on the pipeline below, and after the liquid that leaks soaked the induction cable, detection device sent alarm signal; Adopt special-purpose induction cable (as the TT3000 type cable of U.S. Raychem company) when detecting, the method for implementing to detect is similar to common induction cable, but it can also position leaking the position that takes place except the leakage alarm signal is provided.
In these above-mentioned detecting methods, no matter be that direct Detection Method or indirect detection method just can detect the variation of leaking characteristic quantity when all being based on leak of liquid and arriving to a certain degree, leak sign in advance before and can't capture, therefore do not possess the leakage predictive ability.For interior conduit, have only real-time and accurately pipe leakage is made a prediction, just may really avoid the generation of leakage accident, thereby avoid causing heavy losses.
Summary of the invention
The object of the invention provides a kind of pipeline leakage predicting method, and it can just detect the seepage situation in the seepage stage at pipe leakage initial stage, thereby pipe leakage is made a prediction.
Technological scheme of the present invention is: a kind of pipeline leakage predicting method, it comprises the steps:
(1), twine or tie up the hygroscopicity backing material, the liquid that spills in the extraction duct effectively of described hygroscopicity backing material at the detected position of pipeline;
(2), holding wire is wrapped on the described hygroscopicity backing material, described holding wire comprises the lead connecting body, is arranged on pair of conductors on the described lead connecting body separately and abreast;
(3), detect the variation of the electrical parameter between the described pair of conductors, be used to judge the leakage situation of pipeline.
Described pair of conductors all is a copper conductor, and they are separately fixed on the described lead connecting body, and described lead connecting body is an insulating material.
Distance between the described conductor is 4～6 millimeters.
When the liquid that described hygroscopicity backing material does not have to spill in the extraction duct, the insulation impedance between described two conductors is greater than 100 megohms, and the impedance of described conductor self is less than 1 ohm/100 meters length.
Described hygroscopicity backing material is to be interwoven with wood pulp and non-woven fabrics fiber.
Electrical parameter between the described tested pair of conductors is a resistance.
Electrical parameter between the described tested pair of conductors is an electric capacity.
Usually can be divided into seepage to pipe leakage, leak and release three types according to leakiness.Pipe leakage begins from seepage often, and seepage is to leak the early stage of taking place, and generally can continue long period of time, becomes leakage then along with progressively increasing the weight of of seepage, can not get in time controlling just may developing into unmanageable releasing if leak.Releasing is the most serious a kind of form of pipe leakage, has very strong destructiveness.If just can in time find and adopt an effective measure in the seepage stage, just can avoid the generation of leakage accident to a great extent, Here it is leaks the basic point of departure of predicting.
It is so-called that to leak prediction be exactly some features in advance of catching seepage (promptly leaking early stage).For the seepage of pipeline, obvious characteristics is exactly that the seepage discharge of liquid is less, and attached on the pipeline outer wall, is difficult for being perceived, and pipeline self does not have tangible physical parameter to change.At this moment,, just can adopt an effective measure as early as possible, thereby can avoid the generation of leakage accident if can find a kind of effective method to find the liquid that oozes out on the tube wall.
For with insulating material as for two isolated parallel conductors of lead connecting body, the impedance between the parallel conductor is directly related with the specific conductance of insulating medium.If adopt the very strong material (insulating in the environment of drying) of hygroscopicity as the insulating medium between two conductors, by the liquid that it comes extraction duct to leak out, then the specific conductance of insulating medium will increase along with the rising of its moisture content.The amount of pipe leakage is many more, and the moisture content of insulating medium will be high more, and then the impedance between two conductors is just more little, and vice versa.Therefore, no change is arranged, just can judge pipeline whether seepage takes place, thereby reach the effect of leaking prediction as long as use a testing circuit constantly to detect two resistance values between the conductor.
The present invention compared with prior art has following advantage:
In a single day seepage takes place in pipeline, the liquid that oozes out can be absorbed by the hygroscopicity backing material immediately, cause two insulating medium specific conductances between the conductor to increase, impedance between the conductor just diminishes, can detect the variation of this impedance by testing circuit, and judge according to the amplitude of this changing impedance and the degree of pipe leakage can provide corresponding alarm by detection device, finish pipe leak prediction.
Description of drawings
Accompanying drawing 1 is for being tied with the structural representation of hygroscopicity backing material and holding wire on the pipeline of the present invention;
Accompanying drawing 2 is the A-A direction sectional view (amplifying the back) of accompanying drawing 1;
Accompanying drawing 3 is the plan view of holding wire;
Accompanying drawing 4 is the B-B direction sectional view (amplifying the back) of accompanying drawing 3;
Accompanying drawing 5 is for leaking prediction circuit figure; Wherein:
1, holding wire; 2, hygroscopicity backing material; 3, pipeline; 4, liquid in pipe; 5, lead connecting body; 6, conductor;
Embodiment
Referring to accompanying drawing 1 to accompanying drawing 4, a kind of pipeline leakage predicting method, it comprises the steps:
(1), twine or tie up hygroscopicity backing material 2, the liquid that spills in the extraction duct 3 effectively of described hygroscopicity backing material 2 at the detected position of pipeline 3.Hygroscopicity backing material 2 is selected the hygroscopic materials of U.S. PGI company for use, perhaps select the quick absorbent material HYDROKNIT (for example MPM wiping cloth, DEK wiping cloth) of U.S. Kimberly company for use, they are by pure wood pulp and non-woven fabrics fiber weave in and form.The moisture absorption of pure pulpwood is extremely strong, and non-woven fabrics fiber has guaranteed the high-intensity pulling force of Wiping material.
(2), holding wire 1 is placed or is wrapped on the described hygroscopicity backing material 2, described holding wire 1 comprises lead connecting body 5, is arranged on pair of conductors 6 on the described lead connecting body 5 separately and abreast; Described pair of conductors 6 all is a copper conductor, and they are separately fixed on the described lead connecting body 5, and described lead connecting body 5 is an insulating material.Distance between the described conductor 6 is 4～6 millimeters.When the liquid that described hygroscopicity backing material 2 does not have to spill in the extraction duct 3, the insulation impedance between described two conductors 6 is greater than 100 megohms, and the impedance of described conductor 6 self is less than 1 ohm/100 meters length.
(3), detect the initial value of the electrical parameter between the described pair of conductors 6, the initial value of the electrical parameter between the described pair of conductors 6 is meant when pipeline 3 is intact, records during liquid that described hygroscopicity backing material 2 does not have to spill in the extraction duct 3;
(4), the variation of the electrical parameter between the described pair of conductors 6 of the time detecting of needs, be used to judge the leakage situation of pipeline.
Electrical parameter between the described tested pair of conductors 6 is resistance or electric capacity, detects as parameter with resistance below.
Referring to accompanying drawing 5, in order to measure the changing impedance between two conductors 6 exactly, the present invention has adopted the measuring circuit based on balancing bridge, in this circuit, with the brachium pontis of the impedance Rx between two conductors 6 as measuring bridge, R12, R13, R14 are respectively other three arms of electric bridge, as long as choose suitable resistance, just can guarantee measuring bridge arm balance.For the output voltage that guarantees electric bridge short circuit or open circuit under extreme case in normal range (NR), 11 pairs of electric bridges of a resistance R in parallel shield at the Rx two ends for we; Simultaneously, for the ease of the balance adjustment of electric bridge, adjustable resistance R12 ' of series connection on the R12 brachium pontis.At the initialization state, make following equilibrium relation set up by adjusting R12 ':
(Rx//R11)＊R14＝(R12+R12’)＊R13
For example select R11=R13=R14=200K, R12=100K, R12 '=100K can guarantee electric bridge is adjusted to balance.In addition, for ease of calculating and the holding circuit working stability, when other parameter of selecting circuit, should observe following principle: R1=R2, R3=R4, R5=R6, R7=R8 as far as possible.
In above-mentioned measuring circuit, that really play amplification is integrated operational amplifier A3, and its magnification factor can be determined by the tissue of R1 and R3 as required.The effect of integrated operational amplifier A1, A2 is in order to improve common mode rejection ratio among the figure, and intensifier circuit is to the inhibition effect of common mode signal.
Consider the validity of long-term online detection, detect that the shape of conductor 6 as shown in Figure 4 at this conductor 6 of selecting to constitute by parallel copper conductor.
When concrete the application, the length of holding wire 1 can intercept according to the actual demand at scene, and the length of used test line and accuracy for predicting are irrelevant.
Holding wire 1 is wrapped in the detected position of pipeline, isolates with hygroscopicity backing material 2 between holding wire 1 and the pipeline 3, the thickness of separation layer is about 1-1.5mm.The number of turns of twining holding wire 1 on pipeline is that the 3-5 circle is advisable, and winding method as shown in Figure 1.Sectional view on pipeline after the winding holding wire as shown in Figure 2.
Illustrate the validity of this Forecasting Methodology below.
At first, according to the method described above test is fixed on the segment pipe 3 to be detected, under the situation that any leakage does not take place, with the impedance RL (t) between two parallel conductors 6 of multimeter measurement, obtaining RL (t) ≈ ∞ measured value is 110M Ω;
In second step, to pipeline 3 outsides simulation pipeline 3 seepages of dripping, the moisture content of hygroscopicity backing material 2 progressively increases lentamente, and the resistance value of measuring between two conductors 6 with multimeter is constantly reducing, and reaches 10K Ω until the value of RL (t).
The 3rd step, when the value of RL (t) was reduced to the 10K Ω left and right sides, even add many again water again on hygroscopicity backing material 2, the value of RL (t) also no longer reduced, illustrate that the moisture content of hygroscopicity backing material 2 has reached 100% at this moment, be equivalent to pipeline 2 leakage has taken place.
Size according to RL (t) value just can judge whether to leak generation, and the scope that changes according to RL (t) can push away the degree of declaring leak of liquid simultaneously, thereby reaches the purpose of leaking prediction.
Claims (7)
1, a kind of pipeline leakage predicting method, it is characterized in that: it comprises the steps:
(1), twine or tie up hygroscopicity backing material (2), the liquid that spills in the extraction duct (3) effectively of described hygroscopicity backing material (2) at the detected position of pipeline (3);
(2), holding wire (1) is wrapped on the described hygroscopicity backing material (2), described holding wire (1) comprises lead connecting body (5), is arranged on pair of conductors (6) on the described lead connecting body (5) separately and abreast;
(3), detect the variation of the electrical parameter between the described pair of conductors (6), be used to judge the leakage situation of pipeline.
2, pipeline leakage predicting method according to claim 1 is characterized in that: described pair of conductors (6) all is a copper conductor, and they are separately fixed on the described lead connecting body (5), and described lead connecting body (5) is an insulating material.
3, pipeline leakage predicting method according to claim 2 is characterized in that: the distance between the described conductor (6) is 4～6 millimeters.
4, pipeline leakage predicting method according to claim 2, it is characterized in that: when the liquid that described hygroscopicity backing material (2) does not have to spill in the extraction duct (3), insulation impedance between described two conductors (6) is greater than 100 megohms, and the impedance of described conductor (6) self is less than 1 ohm/100 meters length.
5, pipeline leakage predicting method according to claim 1 is characterized in that: described hygroscopicity backing material (2) is to be interwoven with wood pulp and non-woven fabrics fiber.
6, pipeline leakage predicting method according to claim 1 is characterized in that: the electrical parameter between the described tested pair of conductors (6) is a resistance.
7, pipeline leakage predicting method according to claim 1 is characterized in that: the electrical parameter between the described tested pair of conductors (6) is an electric capacity.
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| CNB2005100942719A CN100491809C (en) | 2005-09-05 | 2005-09-05 | Pipeline leakage predicting method |
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| CNB2005100942719A CN100491809C (en) | 2005-09-05 | 2005-09-05 | Pipeline leakage predicting method |
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| CN100491809C true CN100491809C (en) | 2009-05-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9347590B2 (en) | 2010-07-21 | 2016-05-24 | Areva Gmbh | Component for conducting or receiving a fluid and method for testing the component |
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| US8561456B2 (en) * | 2008-09-12 | 2013-10-22 | The Boeing Company | Fluid detection with a spectrometer-on-a-chip |
| CN102269325A (en) * | 2010-06-04 | 2011-12-07 | 武汉新芯集成电路制造有限公司 | Pipeline system and leakage detection method of pipeline system |
| CN102162765B (en) * | 2011-01-26 | 2012-06-06 | 南京航空航天大学 | System and method for detecting leakage of high-temperature gas in high-temperature high-pressure guide pipe of airplane |
| CN104006300A (en) * | 2013-02-27 | 2014-08-27 | 华邦电子股份有限公司 | Portable liquid leakage sensing device |
| CN105241615B (en) * | 2015-09-23 | 2018-05-01 | 南京化工特种设备检验检测研究所 | The detection device that glass substrate leaks in a kind of enamel glass reaction kettle |
| CN106123109B (en) * | 2016-08-05 | 2022-02-15 | 倪晨钧 | Pipeline monitoring system |
| CN106764462A (en) * | 2017-01-19 | 2017-05-31 | 常州黄河机电工程有限公司 | Intelligent conduit pipeline water leakage detection warning protection device and its method of work |
| CN107061999B (en) * | 2017-06-09 | 2018-12-14 | 中国石油大学(华东) | A kind of Leak Detection in Oil Pipeline Using device and detection method |
| CN108073122A (en) * | 2017-12-20 | 2018-05-25 | 山西省交通建设工程监理有限责任公司 | The long-range monitoring and warning control system of fire protection pipeline leak-proof anti-freezing |
| CN112840191A (en) * | 2018-10-16 | 2021-05-25 | 3M创新有限公司 | Leak detector membrane |
| CN114811452A (en) * | 2022-04-08 | 2022-07-29 | 国网山东省电力公司建设公司 | Method, device and system for monitoring and positioning leakage of buried pipeline of transformer substation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9347590B2 (en) | 2010-07-21 | 2016-05-24 | Areva Gmbh | Component for conducting or receiving a fluid and method for testing the component |
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