CN112414630A - Helium cover method long-distance pipeline leakage point troubleshooting positioning device and troubleshooting method - Google Patents
Helium cover method long-distance pipeline leakage point troubleshooting positioning device and troubleshooting method Download PDFInfo
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- CN112414630A CN112414630A CN202011021746.2A CN202011021746A CN112414630A CN 112414630 A CN112414630 A CN 112414630A CN 202011021746 A CN202011021746 A CN 202011021746A CN 112414630 A CN112414630 A CN 112414630A
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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
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/222—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for tubes
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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
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
-
- 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
-
- 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
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/202—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material using mass spectrometer detection systems
- G01M3/205—Accessories or associated equipment; Pump constructions
Abstract
The invention belongs to the nondestructive testing technology, in particular to a 'helium cover method' long-distance pipeline leakage point investigation positioning device and an investigation method, wherein the device comprises a flow supply and control plate A arranged at the upstream of a tested pipeline, a helium cover connected with the tested pipeline and a helium applying plate B; the helium cover and the helium applying plate B consist of a helium cover, a helium concentration detector, a pressure reducing valve, a helium supply switch, a helium pressure stabilizing tank, a helium bottle and a pressure gauge; the method comprises the steps of purging a pipeline, removing residual working gas, installing a helium cover on a detected pipe section, performing leak detection after helium is filled in the detected pipe section, taking the positions of flange openings at the two ends of an inlet and an outlet of the pipeline as detection interfaces, and performing staged leak detection and positioning on the pipeline in a mode of applying a long-distance helium cover on the process pipeline so as to determine the number and the positions of the leak points of the buried pipeline, is safe and reliable, and can perform leak detection in high-risk places such as inflammable and explosive places, high-temperature places and the like.
Description
Technical Field
The invention belongs to the nondestructive testing technology, and particularly relates to a device and a method for checking and positioning leakage points of a pipeline.
Background
Although a plurality of pipeline sealing verification methods exist in the field of nondestructive testing at present, a few technical methods for positioning leakage points of pipelines exist, and particularly, a few methods for positioning the leakage points of outdoor long-distance pipelines exist, so that a new method for positioning the leakage points of long-distance single-walled pipes needs to be developed.
The oil and gas transportation industry mainly preassembles the leak detection device in the pipeline installation stage and needs to periodically electrify weak current to carry out leak detection work. However, the method has low sensitivity of leak points, and is not suitable for transportation pipelines of flammable and explosive media such as hydrogen, chlorine and the like due to the need of electrifying, and the helium leak detection pipette method is also used for positioning the outside of the leak points of the pipelines, but the characteristic of point-by-point investigation is not suitable for long-distance (more than 50 meters) outdoor pipeline leak detection. Therefore, developing an efficient, safe and reliable long-distance pipeline leakage point investigation positioning technology is one of the main directions of method research.
Disclosure of Invention
The invention aims to provide a helium cover method long-distance pipeline leakage point checking and positioning device and a checking method, which can ensure that the positions of a plurality of leakage points of a pipeline can be accurately positioned, the direction of subsequent inner pipe defect processing work is determined, and the workload is reduced.
The technical scheme of the invention is as follows:
the helium cover method long distance pipeline leakage point investigation positioning device comprises a flow supply and control plate A arranged at the upstream of a detected pipeline, a helium cover connected with the detected pipeline and a helium applying plate B;
the flow supply and control plate A comprises a compressed air source, an air pressure stabilizing tank, a flow regulating valve, an air switch, a bypass switch, a flow sensor, a dew-point thermometer, a temperature sensor and a reference leak hole preformed hole; the compressed air source is connected with the air pressure stabilizing tank, a gas outlet of the air pressure stabilizing tank is connected with a pipeline through a hose joint, a flow regulating valve, an air switch, a flow sensor, a dew point thermometer, a temperature sensor, a reference leak hole preformed hole and an upstream connecting flange are sequentially arranged on the outlet pipeline of the air pressure stabilizing tank, and a bypass pipeline and a bypass switch are connected in parallel at the air inlet end of the air switch and the outlet end of the flow sensor;
the helium cover and helium applying plate B consists of a helium cover, a helium concentration detector, a pressure reducing valve, a helium supply switch, a helium pressure stabilizing tank and a helium bottle; the pipeline to be detected is communicated with a helium pipeline, a helium cover is arranged at a pipeline joint, the helium pipeline comprises a helium bottle and a helium pressure stabilizing tank which are used for providing a gas source, and a helium supply switch and a pressure reducing valve are sequentially arranged on the helium pipeline along the flowing direction of helium.
The helium cover is a telescopic rubber air bag, and the joint of the helium cover and the pipeline is sealed by a rubber ring.
The device comprises a downstream measurement and data acquisition analysis plate C, a downstream connection flange, a suction gun, a helium mass spectrometer, a digital/current converter and an industrial computer, wherein the downstream connection flange is arranged on a detected pipeline; the helium mass spectrometer leak detector and the mass spectrometer suction gun are used for detecting the concentration change of helium in the inner pipe; the industrial computer is used for analyzing all data and finally obtaining the accurate position of the leakage point.
The industrial computer can measure the time T from the flow change moment to the concentration change moment of the helium mass spectrometer leak detector, the measured air temperature T, the pipeline sectional area S and the pipeline flow velocity V2Calculating the distance between the leakage point and the gun mouth of the suction gun by the correction coefficient k
The connecting pipelines all use hard pressure-bearing hoses.
The helium cover method long-distance pipeline leakage point checking method utilizes the helium cover method long-distance pipeline leakage point checking and positioning device to carry out the following steps:
step 1: mounting component
Connecting an upstream connecting flange and a downstream connecting flange in the device with the detected pipeline; the digital/current converter, the industrial computer and the helium mass spectrometer leak detector are respectively connected with a power supply, and the standard leak hole is arranged at the position of the reference leak point reserved hole;
step 2: pipeline purging
And opening a compressed air source, closing an air switch, opening a flow regulating valve and a bypass switch, purging the pipeline and removing residual working gas.
And step 3: system accuracy check
After purging is finished, the bypass switch is closed, the air switch is opened, the flow control valve is adjusted, and the flow is adjusted to be V1After the helium signal is monitored, the flow control valve is adjusted to adjust the flow to V2Recording the time from the flow change to the sudden change of the helium concentration curve on the helium mass spectrometer leak detector, and the industrial computer recording the time T, the air temperature T, the pipeline section area S and the pipeline flow velocity V from the flow change moment to the concentration change moment of the helium mass spectrometer leak detector2And calculating the distance between the reference leak point and the gun suction opening. Comparing the calculated result with the actual distanceVerifying the positioning accuracy of the device, removing the reference leak if the accuracy does not meet the requirement, otherwise, checking the equipment condition, and performing the step 4;
and 4, step 4: helium cover for filling helium
Installing a helium cover on a detected tube section, clamping and sealing two ends of the helium cover by using rubber rings, opening a helium bottle, opening a helium switch, filling helium into a helium pressure stabilizing tank and the helium cover, adjusting a pressure reducing valve to stabilize the pressure in the helium cover of the pressure stabilizing tube, and then closing the helium bottle;
and 5: preliminary examination
And after the helium cover is filled with helium, observing whether a signal curve of the leak detector has a rising trend, if the curve has an obvious rising condition, indicating that a leakage point exists, and if not, ending the flow.
Step 6: positioning
After the existence of the leakage point is determined, the flow in the pipe is stably supplied to the curve to be stable, and the flow sensor is adjusted to adjust the air flow of the inner pipe to V1If leakage points exist, helium concentration curves on the helium mass spectrometer leak detector and the industrial computer show obvious mutation, the mutation times represent the number of the leakage points, and the industrial computer can change the time T between the moment of flow change and the moment of concentration change of the helium mass spectrometer leak detector, the air temperature T, the pipeline sectional area S and the pipeline flow velocity V according to the flow rate2And determining the distance between the leakage point and the suction gun mouth of the helium mass spectrometer leak detector by using a correction coefficient k, wherein the formula is as follows
The positioning precision in the step 3 is 0-2 meters.
Correction factor
Adjusting the flow sensor to adjust the inner tube air flow to V1The range is 0.3 to 0.8 m/s.
The observation time in the step 5 is 0.5-1 h.
The invention has the following remarkable effects: the long-distance pipeline leakage point investigation positioning device based on the helium cover method uses the flange port positions at the inlet and outlet ends of a pipeline as detection interfaces, and carries out pipeline staged leakage point investigation and positioning in a mode of applying a long-distance helium cover on a process pipeline so as to determine the number and the positions of the leakage points of the buried pipeline. Under the condition that the helium environment outside the pipeline and the size of the leak points are not changed, the flow change in the pipeline can cause the indication value of the helium mass spectrometer leak detector to correspondingly change.
Based on the principle of correlation between leak rate and speed of a leak hole, the detection device capable of checking and positioning the leak points of the long-distance single-layer pipeline in a segmented manner is provided, and whether the pipeline section leaks or not and the number of the leak points can be detected;
based on the principle of correlation between leak rate of a leak hole and speed, the positioning device capable of checking and positioning the leak point of the long-distance single-layer pipeline in a segmented manner is provided, and the distance between a specific leak point and the position of a suction gun opening can be detected;
the helium cover method leak detection technology is used, the helium cover can be flexibly installed, and the pipeline can be monitored in sections;
the length of the helium cover can be freely controlled, and the detection efficiency is greatly improved in the long pipe leakage point positioning compared with the common helium mass spectrum suction gun method. The device is particularly suitable for the leakage point investigation and positioning work of outdoor long-distance transport pipelines; when in use, only the termination work is carried out at the two ends of the detected pipeline, so that the structure of the detected pipeline is protected from being damaged to the maximum extent;
the leakage point positioning device works by using helium and compressed air as media, is safe and reliable, and can perform leakage detection in flammable and explosive places, high-temperature places and other high-risk places.
Drawings
FIG. 1 is a schematic diagram of a long-distance pipeline leakage point inspection positioning device based on a helium cover method;
in the figure: 1. a compressed air source; 2. an air surge tank; 3. a flow regulating valve; 4. an air switch; 5. a bypass switch; 6. a flow sensor; 7. a dew point thermometer; 8. a temperature sensor; 9. a reference leak point; 10. an upstream connecting flange; 11. a pipeline to be detected; 12. a helium enclosure; 13. a helium concentration detector; 14. a pressure reducing valve; 15. a helium supply switch; 16. helium surge tank; 17. a helium tank; 18. a downstream connecting flange; 19. a suction gun; 20. a helium mass spectrometer; 21. a digital/current converter; 22. an industrial computer.
Detailed Description
The invention is further illustrated by the accompanying drawings and the detailed description.
As shown in figure 1, the long-distance pipeline leakage point investigation positioning device based on the helium cover method comprises an upstream flow supply and control plate A, a helium cover and helium gas applying plate B and a downstream measurement and data acquisition and analysis plate C.
The upstream flow supply and control panel A is composed of a compressed air source 1, an air pressure stabilizing tank 2, a flow regulating valve 3, an air switch 4, a bypass switch 5, a flow sensor 6, a dew point thermometer 7, a temperature sensor 8, a reference leak point 9 and an upstream connecting flange 10 (shown in the panel A in the figure).
The compressed air source 1 is connected with the air pressure stabilizing tank 2, the gas outlet of the air pressure stabilizing tank 2 is connected with a pipeline through a hose joint, and the outlet pipeline of the air pressure stabilizing tank 2 is sequentially provided with a flow regulating valve 3, an air switch 4, a flow sensor 6, a dew point thermometer 7, a temperature sensor 8, a reference leak point 9 and an upstream connecting flange 10. And a bypass pipeline and a bypass switch 5 are connected in parallel at the air inlet end of the air switch 4 and the outlet end of the flow sensor 6.
The piping of the upstream flow supply and control panel a uses rigid pressure-bearing hoses.
The upstream flow supply and control panel a is used to provide various flows of air. Wherein, the air pressure stabilizing tank 2 introduces air from the compressed air source 1 and provides a source of stable pressure; the air switch 4 and the flow sensor 6 are used for controlling the input flow of the inner pipe; the bypass switch 5 is used in a pipeline purging mode and purges residual media in the pipe; the temperature sensor 8 and the dew point temperature sensor 7 are used for collecting temperature and humidity.
The helium cover and helium applying plate B consists of a helium cover 12, a helium concentration detector 13, a pressure reducing valve 14, a helium supply switch 15, a helium pressure stabilizing tank 16 and a helium bottle 17.
The pipeline 11 to be detected is a pipeline led out from the upstream flow supply and control plate A, a helium pipeline is communicated with the pipeline through a tee joint, a helium cover 12 is installed at the interface of the pipeline, the helium pipeline comprises a helium bottle 17 and a helium pressure stabilizing tank 16, a helium supply switch 15 and a pressure reducing valve 14 are sequentially installed on the helium pipeline along the flowing direction of helium gas.
The helium enclosure and helium gas application plate are used to provide a steady state helium gas environment to the outside of the section being tested. The helium cover 12 uses a pressure-bearing telescopic rubber air bag, and the joint of the helium cover and the pipeline is sealed by a rubber ring. The pressure relief valve 14 is used to control the pressure in the helium enclosure.
A helium concentration detector 13 is mounted on the helium cover 12 and used for detecting the stable condition of the helium concentration in the helium cover.
The connecting pipelines of the helium cover and the helium applying plate B both use hard pressure-bearing hoses.
The helium pressure stabilizing tank 16 is provided with a hose end joint to provide sufficient stable space for the introduced helium and ensure the pressure stability of the inlet of the pressure reducing valve.
The downstream measurement and data acquisition analysis panel C is composed of a downstream connecting flange 18 mounted on the pipeline 11 to be tested, a suction gun 19 mounted through the downstream connecting flange 18, a helium mass spectrometer 20, a digital/current converter 21, and an industrial computer 22.
The downstream measurement and data acquisition analysis plate C is used for monitoring the concentration of helium at a downstream outlet of the pipeline, and analyzing by combining the temperature and humidity data acquired from the plate A and the flow value to obtain the accurate position of a leakage point. The helium mass spectrometer 20 and the suction gun 19 are used for detecting the concentration change of helium gas in the inner tube, and the transmission cable is used for summarizing data of the flow supply and control plate block A.
The industrial computer 22 is used to analyze all the data and ultimately obtain the precise location of the leak.
Specifically, the industrial computer can measure the time T from the flow change moment to the concentration change moment of the helium mass spectrometer leak detector, the measured air temperature T, the pipeline sectional area S and the pipeline flow velocity V according to the time T from the flow change moment2And the correction coefficient k determines the distance between the leak point and the muzzle of the suction gun 19. The formula is as follows.
When the system is used for carrying out missing point checking, the specific steps are as follows:
step 1: mounting component
Connecting the device with the pipeline 11 to be detected through an upstream connecting flange 10 and a downstream connecting flange 18; the industrial computer 22 and the helium mass spectrometer 20 are respectively connected with a power supply, and a proper standard leak hole is selected to be arranged at the position of the reference leak point 9;
step 2: pipeline purging
And opening a compressed air source 1, closing an air switch 4, opening a flow regulating valve 3 and a bypass switch 4, purging the pipeline and removing residual working gas.
And step 3: system accuracy check
After purging is finished, the bypass switch 5 is closed, the air switch 4 is opened, the flow control valve 3 is adjusted, and the flow is adjusted to be V1After the helium signal is monitored, the flow control valve 3 is adjusted to adjust the flow to V2Recording the time from the flow change to the sudden change of the helium concentration curve on the helium mass spectrometer 20, and the industrial computer recording the time T, the air temperature T, the pipeline section area S and the pipeline flow velocity V between the flow change moment and the concentration change moment of the helium mass spectrometer leak detector2The parameters calculate the distance of the reference leak point 9 from the suction gun mouth 19. And comparing the calculation result with the actual distance, verifying the positioning accuracy of the device, removing the reference leak if the accuracy is within an acceptable range (determined according to the user opinion and the general deviation is less than 2 meters), otherwise, checking the equipment condition, and performing step 4.
And 4, step 4: helium cover for filling helium
The helium cover 12 is arranged on the pipe section 11 to be detected (at the moment, the helium cover is in a fully-shrunken state), the two ends of the helium cover are clamped and sealed by rubber rings, the helium bottle 17 is opened, the helium switch 15 is opened, helium is filled into the helium pressure stabilizing tank 16 and the helium cover 12, the pressure reducing valve is adjusted, the helium bottle 17 is closed after the pressure in the helium cover of the pressure stabilizing pipe 16 is stabilized.
And 5: preliminary examination
After the helium cover 12 is filled with helium, whether the signal curve of the helium mass spectrometer 20 has a rising trend within a period of time (0.5-1h) is observed, if the curve has a remarkable rising condition, a leak point exists, and if the curve does not have a rising condition, the flow is ended.
Step 6: positioning
After the existence of the leakage point is determined, the flow in the pipe is stably supplied to the curve and is stable, and the flow sensor 6 is adjusted to adjust the air flow of the inner pipe to V1If leakage points exist, helium concentration curves on the helium mass spectrometer 20 and the industrial computer 22 show obvious mutation, the mutation times represent the number of the leakage points, and the industrial computer can change the time T between the moment of flow change and the moment of concentration change of the helium mass spectrometer leak detector, the air temperature T, the pipeline sectional area S and the pipeline flow velocity V according to the flow rate2And the correction coefficient k and other parameters calculate the distance between the leak point and the suction gun mouth 19. A simple calculation formula is as follows.
v1And V2The value of (A) is determined according to the pipe diameter, generally, the pipe diameter of a pipeline with the pipe diameter of less than 20cm, V1Taking 0.5m/s, V21m/s was taken.
Claims (10)
1. Helium cover method long distance pipeline leak source investigation positioner, its characterized in that: comprises a flow supply and control plate A arranged at the upstream of a detected pipeline (11) and a helium cover and a helium applying plate B connected with the detected pipeline (11);
the flow supply and control plate A comprises a compressed air source (1), an air pressure stabilizing tank (2), a flow regulating valve (3), an air switch (4), a bypass switch (5), a flow sensor (6), a dew-point thermometer (7), a temperature sensor (8) and a reference leakage point (9); the compressed air source (1) is connected with the air pressure stabilizing tank (2), a gas outlet of the air pressure stabilizing tank (2) is connected with a pipeline through a hose joint, a flow regulating valve (3), an air switch (4), a flow sensor (6), a dew point thermometer (7), a temperature sensor (8), a reference leak point (9) and an upstream connecting flange (10) are sequentially arranged on the outlet pipeline of the air pressure stabilizing tank (2), and a bypass pipeline and a bypass switch (5) are connected in parallel at the air inlet end of the air switch (4) and the outlet end of the flow sensor (6);
the helium cover and helium applying plate B consists of a helium cover (12), a helium concentration detector (13), a pressure reducing valve (14), a helium supply switch (15), a helium pressure stabilizing tank (16) and a helium bottle (17); the pipeline (11) to be detected is communicated with a helium pipeline, a helium cover (12) is arranged at the joint of the pipeline, the helium pipeline comprises a helium bottle (17) for providing a gas source and a helium pressure stabilizing tank (16), and a helium supply switch (15) and a pressure reducing valve (14) are sequentially arranged on the helium pipeline along the flowing direction of helium.
2. The helium shroud method long distance pipeline leak point investigation positioning device of claim 1, wherein: the helium cover (12) is a telescopic rubber air bag, and the joint of the helium cover and the pipeline is sealed by a rubber ring.
3. The helium shroud method long distance pipeline leak point investigation positioning device of claim 1, wherein: the device comprises a downstream measurement and data acquisition analysis plate C, a downstream connection flange (18) arranged on a detected pipeline (11), a suction gun (19) arranged through the downstream connection flange (18), a helium mass spectrometer (20), a digital/current converter (21) and an industrial computer (22); the helium mass spectrometer (20) and the mass spectrometer suction gun (19) are used for detecting the concentration change of helium in the inner tube; the industrial computer (22) is used for analyzing all data and finally obtaining the accurate position of the leakage point.
4. The helium shroud long distance pipeline leak point investigation positioning device of claim 3, wherein: industrial computer can be based on a streamTime T from the moment of quantity change to the moment of concentration change of the helium mass spectrometer leak detector, measured air temperature T, pipeline cross-sectional area S and pipeline flow velocity V2The correction coefficient k calculates the distance between the leak point and the muzzle of the suction gun (19)
5. The helium hood method long-distance pipeline leakage point inspection and positioning device as claimed in any one of claims 1-4, wherein: the connecting pipelines all use hard pressure-bearing hoses.
6. The method for checking the leakage points of the long-distance pipeline by the helium cover method is characterized by comprising the following steps of:
step 1: mounting component
Connecting an upstream connecting flange (10) and a downstream connecting flange (18) in the device with a detected pipeline (11); a digital/current converter (21), an industrial computer (22) and a helium mass spectrometer (20) are respectively connected with a power supply, and a standard leak hole is arranged at the position of a reference leak point (9);
step 2: pipeline purging
Opening a compressed air source (1), closing an air switch (4), opening a flow regulating valve (3) and a bypass switch (4), purging a pipeline, and removing residual working gas.
And step 3: system accuracy check
After the purging is finished, the bypass switch (5) is closed, the air switch (4) is opened, the flow control valve (3) is adjusted, and the flow is adjusted to be V1After the helium signal is monitored, the flow control valve (3) is adjusted to adjust the flow to V2Recording the time from the flow change to the sudden change of the helium concentration curve on the helium mass spectrometer (20), and the industrial computer 22 according to the time T from the flow change moment to the concentration change moment of the helium mass spectrometer leak detector, the air temperature T, the pipeline section area S and the pipeline flow velocity V2Calculating the distance between the reference leak point (9) and the gun suction mouth (19)) The distance of (c). Comparing the calculation result with the actual distance, verifying the positioning accuracy of the device, removing the reference leak if the accuracy does not meet the requirement, otherwise, checking the equipment condition, and performing the step 4;
and 4, step 4: helium cover for filling helium
Installing a helium cover (12) on the detected pipe section (11); the two ends of the pressure stabilizing tube are clamped and sealed by rubber rings, a helium tank (17) is opened, a helium switch (15) is opened, helium is filled into a helium pressure stabilizing tank (16) and a helium cover (12), a pressure reducing valve is adjusted, and the helium tank (17) is closed after the pressure in the helium cover of the pressure stabilizing tube (16) is stabilized;
and 5: preliminary examination
And after the helium cover (12) is filled with helium, observing whether a signal curve of the leak detector (20) has a rising trend, if the curve has a remarkable rising condition, indicating that a leakage point exists, and if the curve does not have a rising condition, ending the flow.
Step 6: positioning
After the existence of the leakage point is determined, the flow in the pipe is stably supplied to the curve and is stable, and the flow sensor (6) is adjusted to adjust the air flow of the inner pipe to V1If the leak point exists, the helium concentration curves of the helium mass spectrometer (20) and the industrial computer (22) show obvious mutation, the mutation times represent the number of the leak points, and the industrial computer can change the time T, the air temperature T, the pipeline sectional area S and the pipeline flow velocity V between the moment to the concentration change moment of the helium mass spectrometer leak detector according to the flow, so that the leak point can be detected by the helium mass spectrometer leak detector2And the correction coefficient k determines the distance between the leak point and a gun suction port (19) of the helium mass spectrometer leak detector, and the formula is as follows
7. The helium hood method long-distance pipeline missing point checking method as claimed in claim 6, wherein: the positioning precision in the step 3 is 0-2 meters.
8. The helium hood method long-distance pipeline missing point checking method as claimed in claim 6, wherein: correction factor
9. The helium hood method long-distance pipeline missing point checking method as claimed in claim 6, wherein: the flow sensor (6) is adjusted to adjust the air flow of the inner pipe to V1The range is 0.3 to 0.8 m/s.
10. The helium hood method long-distance pipeline missing point checking method as claimed in claim 6, wherein: the observation time in the step 5 is 0.5-1 h.
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| CN202011021746.2A CN112414630A (en) | 2020-09-25 | 2020-09-25 | Helium cover method long-distance pipeline leakage point troubleshooting positioning device and troubleshooting method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113252253A (en) * | 2021-06-24 | 2021-08-13 | 福建慧芯激光科技有限公司 | Pneumatic valve leak detection device |
| CN114295300A (en) * | 2021-11-25 | 2022-04-08 | 中国核电工程有限公司 | System and method for measuring free volume and internal leakage of habitability area of nuclear power station main control room |
| CN117168713A (en) * | 2023-11-03 | 2023-12-05 | 安徽诺益科技有限公司 | Helium-hydrogen mass spectrometer leak detector signal rapid processing system and method |
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2020
- 2020-09-25 CN CN202011021746.2A patent/CN112414630A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113252253A (en) * | 2021-06-24 | 2021-08-13 | 福建慧芯激光科技有限公司 | Pneumatic valve leak detection device |
| CN113252253B (en) * | 2021-06-24 | 2024-02-09 | 福建慧芯激光科技有限公司 | Pneumatic valve leak hunting device |
| CN114295300A (en) * | 2021-11-25 | 2022-04-08 | 中国核电工程有限公司 | System and method for measuring free volume and internal leakage of habitability area of nuclear power station main control room |
| CN117168713A (en) * | 2023-11-03 | 2023-12-05 | 安徽诺益科技有限公司 | Helium-hydrogen mass spectrometer leak detector signal rapid processing system and method |
| CN117168713B (en) * | 2023-11-03 | 2024-02-13 | 安徽诺益科技有限公司 | Helium-hydrogen mass spectrometer leak detector signal rapid processing system and method |
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