CN105864642B - A kind of pipeline leakage testing device and detection method - Google Patents
A kind of pipeline leakage testing device and detection method Download PDFInfo
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- CN105864642B CN105864642B CN201610394009.4A CN201610394009A CN105864642B CN 105864642 B CN105864642 B CN 105864642B CN 201610394009 A CN201610394009 A CN 201610394009A CN 105864642 B CN105864642 B CN 105864642B
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- pipeline
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- flowmeter
- leakage
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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
Abstract
The invention discloses a kind of novel pipeline leak detecting device and detection methods.Three balance pipes are also equipped with along pipeline, pressure sensor is mounted on each balance pipe, are respectively the first, second, and third pressure sensor along liquid flow direction, the pipeline inside velocity of sound and leakage position are detected by three pressure sensor gathered datas；The first, third pressure sensor flows to the pipeline of entrance equipped with the first, second flowmeter along liquid；Tentatively judge whether to reveal by two flowmeter gathered datas, then finally whether revealed by three pressure sensor real-time data collection judgements, calculates the position obtained at pressure velocity of wave and pipe leakage in pipeline.The present invention can demarcate local velocity of sound; detect pipe leakage; it is able to detect that the smaller situation of leakage rate; the local velocity of sound under different operating modes is measured; reduce the false alarm rate caused by adjusting pump to adjust valve; the positioning accuracy for improving pipe leakage is of great significance for energy saving, environmental protection.
Description
Technical field
The present invention relates to a kind of detection device and detection methods, and in particular to a kind of pipeline leakage testing device and inspection
Survey method, can local velocity of sound in calibration pipeline, reduce leakage false alarm, improve leakage positioning accuracy.
Background technology
Pipeline transportation is listed as five big traffic means of transportation with railway transportation, highway transportation, waterway transportation and air transportation,
There is unique advantage in conveying liquid, gas, slurry etc..With the rapid development of Chinese national economy, pipeline transportation
And role of the large-scale refitting equipment in economic development is more and more important.But with pipeline increase and operation hours
Increase, due to constructional deficiency, erosion corrosion and artificial destruction etc., pipeline leakage accident occurs tube wall again and again.
Morning on December 30th, 2009, the long processed oil pipeline Weinan branch line of China Petroleum orchid Zheng find massive diesel-fuel leak into
Enter Chishui River, forming contaminated zone in the Weihe River enters the Yellow River, and the Yellow River is caused to pollute.At night on May 17th, 2016, it is ancient that general headquarters are located at profit
The underground oil pipeline of the mineral oil processing Pi Yemengte industrial groups of the areas Li Ya great Bu Sala ruptures, and causes 550 tons of originals
Oil leakage, wherein there is 50 tons of inflow surrounding waters.
Currently, the device of most of detection pipe leakages is all difficult arriving for detection for the generation of tiny leakage event, and
Existing constant value is all generally used for the velocity of sound, and the velocity of sound can be with temperature in practice, the percentage etc. of air in pipeline
The variation of factor and change.
Invention content
In order to detect the generation of tiny leakage event, economize on resources, environmental protection improves the precision of leakage positioning.This hair
It is bright to propose a kind of pipeline leakage testing device and detection method, to meet the requirement of detection tiny leakage, detected meeting
Under the premise of tiny leakage requires, local velocity of sound has been demarcated, has reduced and pumps false alarm rate caused by adjusting valve by adjusting, improve pipeline and let out
The positioning accuracy of leakage.
The technical solution adopted by the present invention is：
One, a kind of pipeline leakage testing device：
Including centrifugal pump, it is connected to the pipeline of outlet of centrifugal pump and first electronic on pipeline at outlet of centrifugal pump
Regulating valve is also equipped with three balance pipes along pipeline, is respectively mounted that there are one for detecting hydraulic pressure in pipeline on each balance pipe
Pressure sensor, three pressure sensors are respectively first pressure sensor, second pressure sensor and third along liquid flow direction
Pressure sensor, the pressure data pair acquired by first pressure sensor, second pressure sensor and third pressure sensor
Pipeline leakage position is detected；The pipeline that first pressure sensor flows to entrance along liquid is equipped with first flowmeter, third
Pipeline of the pressure sensor along the outlet of liquid flow direction is equipped with second flowmeter, is acquired by first flowmeter and second flowmeter
Data on flows leak detection result is modified, reduce adjust pump adjust valve caused by false alarm rate.
The present invention installs pressure sensor using balance pipe, and balance pipe can play the role of gentle pressure, so as to
Improve the sensitivity detected for tiny leakage.
Exhaust outlet is provided on the balance pipe, exhaust outlet is communicated with pipeline, and exhaust outlet is used for will be in balance pipe and pipeline
Air discharge, convenient for before experiment test by balance pipe air be discharged.
Sensor installation port, first pressure sensor, second pressure sensor and third pressure are provided on the balance pipe
Force snesor uses with sensor installation port and is threadedly coupled fixation.
The first pressure sensor and first flowmeter is installed in pipeline input terminal end, the third pressure
Sensor and second flowmeter are mounted on pipeline output end end, and second pressure sensor is mounted on first pressure sensor and the
Between three pressure sensors.
Two, a kind of pipeline leakage detection method is specifically comprised the following steps using the detection device：
1) data on flows acquired by first flowmeter and second flowmeter tentatively judges whether pipeline is let out
Dew；
2) after tentatively judging that pipeline is revealed, pass through first pressure sensor, second pressure sensor and third pressure
Sensor acquires the pressure data on pipeline everywhere and judges whether pipeline is finally revealed again in real time；
3) determine the pressure data acquired in real time by pressure sensor after leakage calculate obtain pressure velocity of wave in pipeline and
Position at pipe leakage.
When valve opening reduction or termination of pumping, first pressure sensor and the collected pressure of third pressure sensor all can
It reduces, and when leaking generation, first pressure sensor and the collected pressure of third pressure sensor also can all be reduced, at this time
Just it can not judge whether pipeline is leaked by the variation of collected pressure value.Therefore in abovementioned steps, pass through
The first flowmeter and the data on flows of second flowmeter acquisition are modified leak detection result.
When the reduction of the first electric control valve valve opening, termination of pumping or leakage, first flowmeter and second flowmeter are adopted
The variation of flow its value collected is different.When the reduction of the first electric control valve valve opening or termination of pumping, first flow
The flow that meter and second flowmeter are acquired all is to reduce, and when leaking generation, the collected flow of first flowmeter institute is
It is increased, and second flowmeter collected flow be reduce, so as to judge whether pipeline is leaked.Thus
On the one hand first flowmeter and second flowmeter can play the role of detection leakage, on the other hand can reduce due to adjusting pump to adjust
False alarm rate caused by valve.
The step 1) is specifically：If the collected data on flows of first flowmeter increases and the second flowmeter
Collected data on flows reduces, then it is assumed that tentatively judges that pipeline is revealed, otherwise without revealing.
The step 2) is specifically on the basis of step 1) tentatively judges that pipeline is revealed, if the first pressure senses
Device and the collected pressure data of third pressure sensor reduce, then judge that pipeline is finally leaked, otherwise do not have
It reveals.
It is acquired in real time by the first pressure sensor, second pressure sensor and third pressure sensor each on pipeline
The pressure data at place is obtained according to the distance between second pressure sensor and third pressure sensor x using following formula calculating
The pressure velocity of wave v (being equivalent to local velocity of sound, refer to the speed that sound is propagated in a liquid) in pipeline is obtained, to improve positioning accurate
Degree：
Wherein, t1 and t2 indicates that the pressure wave generated at pipe leakage reaches second pressure sensor and third pressure respectively
The time of sensor, v are the pressure velocity of wave in pipeline；
Then following formula is used to calculate the position obtained at pipe leakage：
X1=v × (t2-t3)
Wherein, x1 is leak to the distance of first sensor, i.e. position at pipe leakage, and t3 is to be produced at pipe leakage
Raw pressure wave reaches the time of first pressure sensor.
The invention has the advantages that：
The present invention improves the sensitivity detected for tiny leakage, reduces the false alarm rate caused by adjusting pump to adjust valve, keeps away
The waste of resource is exempted from, and also proposed calibration local velocity of sound, to improve the positioning accuracy of pipeline leakage testing.Uniformly
Exhaust outlet is provided on pipe to improve the accuracy for measuring manifold pressure value.
The present invention has the advantages that of simple structure and low cost and easy to install and use.
The present invention can meet the needs of fields such as oil, chemical industry.
Description of the drawings
Fig. 1 is the schematic diagram of experimental provision of the present invention.
Fig. 2 is the tomograph of balance pipe of the present invention.
Table 1 is using the positioning result comparison diagram after new leak detecting device.
In figure：1. centrifugal pump, 2. first electric control valves, 3. first flowmeters, 4. first pressure sensors, 5. leakages
Hole, 6. second pressure sensors, 7. third pressure sensors, 8. second flowmeters, 9. pipelines, 10. motorized needle valves, 11. second
Electric control valve, 12. balance pipes, 12.1 exhaust outlets, 12.2 sensor installation ports.
Specific implementation mode
The invention will be further described with reference to the accompanying drawings and examples.
The present invention specific emulation embodiment and its implementation process be：
In specific implementation, leak 5 is opened up on pipeline 9, motorized needle valve 10 and the second electric adjustable are installed at leak 5
Valve 11 is saved, motorized needle valve 10 is used for controlling the size of leakage rate, and the second electric control valve 11 is used for controlling opening i.e. for leak
It closes, the second electric control valve 11 and motorized needle valve 10 are connected through a screw thread fixation.
First pressure sensor 4 is housed before leakage hole 5 at 1m, second pressure sensor 6 is housed after leak 5 at 1m,
Third pressure sensor 7 is housed after leak at 100m.By observing first flowmeter, first pressure sensor, third pressure
The numerical value change of sensor and second flowmeter, it can be determined that whether pipeline leaks, and adjusts valve to cause because adjusting to pump to reduce
False alarm rate.By measure the signal that sends out of leak arrive separately at second pressure sensor and third pressure sensor when
Between the distance x of t1 and t2 and second pressure sensor and third pressure sensor, local velocity of sound can be demarcated, it is fixed to improve
The precision of position.As can be seen from Table 1, after using new pipeline leakage testing device, the precision of positioning improves,
The especially smaller leakage of leakage rate, positioning accuracy have significant raising.Pass through the pressure wave in the gentle pipeline of balance pipe
It is dynamic, to improve the sensitivity detected for tiny leakage.
Table 1：Using the positioning result comparison after new leak detecting device
It can be seen that the present invention is directed to demarcate local velocity of sound, reduce because adjust pump adjust valve caused by false alarm rate, improve for
The sensitivity of tiny leakage detection.The present invention has very great meaning for energy saving, environmental protection.
Claims (2)
1. a kind of pipeline leakage detection method, it is characterised in that use detection device, the detection device includes centrifugal pump
(1), the pipeline (9) and the first electric adjustable on centrifugal pump (1) exit pipeline (9) for being connected to centrifugal pump (1) outlet
Save valve (2), it is characterised in that：Three balance pipes (12) are also equipped with along pipeline (9), one is mounted on each balance pipe (12)
A pressure sensor for detecting pipeline (9) interior hydraulic pressure, three pressure sensors are respectively that first pressure passes along liquid flow direction
Sensor (4), second pressure sensor (6) and third pressure sensor (7) are passed by first pressure sensor (4), second pressure
Sensor (6) and the pressure data of third pressure sensor (7) acquisition are detected pipeline (9) leakage position；First pressure passes
The pipeline (9) that sensor (4) flows to entrance along liquid is equipped with first flowmeter (3), and third pressure sensor (6) is flowed to along liquid
The pipeline (9) of outlet is equipped with second flowmeter (8), the flow number acquired by first flowmeter (3) and second flowmeter (8)
It is modified according to leak detection result；The first pressure sensor (4) and first flowmeter (3) is installed in pipeline
(9) input terminal end, the third pressure sensor (7) and second flowmeter (8) are mounted on pipeline (9) output end end；
Specifically comprise the following steps：
1) data on flows acquired by first flowmeter (3) and second flowmeter (8) tentatively judges whether pipeline (9) occurs
Leakage；
The step 1) is specifically：If the collected data on flows of first flowmeter (3) increases and the second flowmeter
(8) collected data on flows reduces, then it is assumed that tentatively judges that pipeline (9) is revealed, otherwise without revealing；
2) after tentatively judging that pipeline is revealed, pass through first pressure sensor (4), second pressure sensor (6) and third pressure
The pressure data that force snesor (7) acquires on pipeline everywhere in real time judges whether pipeline (9) is finally revealed again；
The step 2) is specifically on the basis of step 1) tentatively judges that pipeline is revealed, if the first pressure sensor
(4) it is reduced with the third pressure sensor (7) collected pressure data, then judges that pipeline is finally leaked, it is no
Then without revealing；
3) determine that the pressure data calculating acquired in real time by pressure sensor (7) after leakage obtains the pressure velocity of wave in pipeline (9)
With the position at pipe leakage.
2. a kind of pipeline leakage detection method according to claim 1, it is characterised in that：It is sensed by the first pressure
Device (4), second pressure sensor (6) and third pressure sensor (7) pressure data on acquisition pipeline everywhere in real time, according to the
The distance between two pressure sensors (6) and third pressure sensor (7) x calculate the pressure obtained in pipeline using following formula
Velocity of wave v, to improve positioning accuracy：
Wherein, t1 and t2 indicates that the pressure wave generated at pipe leakage reaches second pressure sensor (6) and third pressure respectively
The time of sensor (7), v are the pressure velocity of wave in pipeline；
Then following formula is used to calculate the position obtained at pipe leakage：
X1=v × (t2-t3)
Wherein, x1 is distance of the leak to first sensor (4), and t3 is that the pressure wave generated at pipe leakage reaches the first pressure
The time of force snesor (4).
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| CN105864642B true CN105864642B (en) | 2018-07-24 |
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| CN109185714A (en) * | 2018-10-17 | 2019-01-11 | 张雪 | The online leakage detection method of pipeline based on expert diagnosis |
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| CN113236986B (en) * | 2021-06-30 | 2022-10-28 | 杭州艾科赛德电子科技有限公司 | Pipeline leakage monitoring system based on sonar detection |
| CN114738679B (en) * | 2022-04-11 | 2023-09-22 | 长江大学 | Pipeline missing detection device and pipeline missing detection method |
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Effective date of registration: 20211228 Address after: Room 202-208, 2nd floor, building 5, 2626 yuhangtang Road, Cangqian street, Yuhang District, Hangzhou, Zhejiang 311100 Patentee after: Zhejiang Haiyu Environmental Protection Technology Co.,Ltd. Address before: 310018 No. 928, No. 2 Baiyang street, Jianggan Economic Development Zone, Hangzhou, Zhejiang Patentee before: ZHEJIANG SCI-TECH University |
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