CN110887613A - Sealing detection method for air pressure test of large pressure container - Google Patents
Sealing detection method for air pressure test of large pressure container Download PDFInfo
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- CN110887613A CN110887613A CN201911242199.8A CN201911242199A CN110887613A CN 110887613 A CN110887613 A CN 110887613A CN 201911242199 A CN201911242199 A CN 201911242199A CN 110887613 A CN110887613 A CN 110887613A
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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
- G01M3/06—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool
- G01M3/10—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool for containers, e.g. radiators
-
- 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
-
- 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
- G01M3/226—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 containers, e.g. radiators
-
- 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
- G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
-
- 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
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3236—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3272—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers for verifying the internal pressure of closed containers
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
A sealing detection method for a large pressure vessel air pressure test comprises the following steps; 1) pressurizing the pressure container, and searching for a leakage point; 2) continuously pressurizing the pressure container on the basis of the step 1), and searching for a leakage point; 3) continuously detecting helium background of related cabins and rooms when the pressure vessel is pressurized to about the design pressure, and if the helium background is abnormally raised, checking suspicious leakage points such as valves, flanges, welding seams and the like in the corresponding cabins/rooms; 4) and when the pressure is increased to the test pressure and then is reduced to the design pressure, the leakage point is checked through routing inspection. The invention ensures that the air tightness of the large pressure vessel of the high-temperature gas cooled reactor nuclear power station meets the requirement, and controls the total leakage rate within a reasonable range.
Description
Technical Field
The invention relates to the technical field of air pressure seal detection of large pressure vessels, in particular to a seal detection method for an air pressure test of a large pressure vessel.
Background
The pressure test is divided into a strength test and a sealing test according to different test purposes, and in consideration of the high risk of the air pressure test, the hydraulic pressure test is generally adopted to perform the pressure test when the large pressure container performs the pressure test, and the sealing performance is determined by measuring the leaked liquid medium.
Taking the tightness test of the pressure vessel of the pressurized water reactor nuclear power station of the second generation, the second generation and the third generation in China as an example, the leakage measurement indexes of the pressure vessel loop are divided into three parts, namely total leakage, measurable leakage and undetectable leakage. The measuring method comprises the following steps: the total leakage is calculated by the amount of medium leaked between the containment or refill tank level change calculation units during the leakage rate measurement, the measurable leakage is measured by extracting leaked medium with a needle at each process equipment at the isolation boundary, and the non-measurable leakage is calculated as total leakage-measurable leakage.
Compared with a liquid medium leakage detection method, the gas medium leakage detection method has the problems of difficulty in identification and quantitative calculation. The method for measuring the gas leakage mainly comprises a bubble method, an ultrasonic method, an acoustic emission detection method, a mass spectrometry method, a heat conduction detection method, a pressure drop method and the like, wherein the pressure drop method is mainly used for calculating the total leakage rate, the local leakage point detection method adopts the bubble method, the acoustic emission detection method, the ultrasonic method and the heat conduction detection method, and is mainly used for positioning the large leakage point. The method for checking the gas leakage by investigating and researching a unit with the qualification of civil nuclear safety equipment nondestructive testing is a helium mass spectrometry method which is the mainstream method for quantitatively measuring the gas leakage at home and abroad at present.
The test items of the domestic pressurized water reactor nuclear power station which uses the helium mass spectrometry method for carrying out the tightness inspection on a process system in a large area are a helium leakage test of a steam generator heat transfer pipe and a helium leakage test of a TEG (waste gas system). Helium is injected into a certain proportion of helium into a heat transfer pipe of the steam generator at a primary side (shell side of the heat transfer pipe), the tightness of a single heat transfer pipe is checked at a secondary side (tube side of the heat transfer pipe) by a vacuum helium leakage detection method in a vacuumizing mode, and the acceptance standard of the helium leakage detection method adopts experience data obtained from years of foreign operation experience as the acceptance standard of single-point helium leakage detection. The helium leak detection test of the TEG system is to carry out leak tightness check by a method of carrying out sectional helium gas spraying outside the system and carrying out vacuum helium leak detection in a vacuum pumping mode in the system.
High temperature gas cooled reactor coreThe tightness detection of the power station air pressure test is different from helium leakage detection of an evaporator heat transfer pipe and helium leakage detection of a TEG system, the main detected object for the tightness detection of the primary loop pressure boundary of the high-temperature reactor is a flange structure on a pressure container, the size of the flange structure is large, the number of the flange structure is large, and the detected objects are arranged in a concentrated mode. Due to the particularity of the design of the high-temperature reactor pressure vessel, the limitation of a bubble method adopted for the primary circuit pressure boundary leakage detection is very large, and large-size flanges, valve internal leakage and other parts cannot be used. The ultrasonic method has low leak detection precision of about 10-1Pam3S, and leak rate cannot be measured quantitatively. Acoustic emission can only be applied during pressure changes and cannot be used during the leak tightness check at the pressure holding stage. The difference between the pressure test medium temperature and the environment temperature is not obvious, and the leakage point can not be detected by adopting a heat conduction method. The high-temperature reactor has few operating types at home and abroad, relative operating experience data is lacked as reference, the acceptance standard of single-point helium leakage detection of local leakage points is avoided, and the helium mass spectrometry has great difficulty in application on a high-temperature reactor pressure vessel.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a sealing detection method for a large pressure vessel air pressure test, which ensures that the air tightness of the large pressure vessel of the high-temperature gas-cooled reactor nuclear power station meets the requirement and controls the total leakage rate within a reasonable range.
The technical scheme adopted by the invention is as follows:
a sealing detection method for a large pressure vessel air pressure test comprises the following steps;
1) pressurizing the pressure container, and searching for a leakage point;
2) continuously pressurizing the pressure container on the basis of the step 1), and searching for a leakage point;
3) continuously detecting helium background of related cabins and rooms when the pressure vessel is pressurized to about the design pressure, and if the helium background is abnormally raised, checking suspicious leakage points such as valves, flanges, welding seams and the like in the corresponding cabins/rooms;
4) and when the pressure is increased to the test pressure and then is reduced to the design pressure, the leakage point is checked through routing inspection.
And (2) pressurizing the pressure container in the step 1) to about 0.3MPa, and searching for a leak point by adopting a bubble method or an ultrasonic method.
And 2) pressurizing the pressure container to about 0.6MPa, and searching a leakage point by adopting a helium leakage detection method.
Pressurizing the system to 0.15MPa in the step 1), maintaining the pressure for 30min, observing the pressure change condition, if the pressure is stable, continuously and gradually boosting, boosting according to a 10% target value, observing the pressure change condition, and if the pressure cannot be stable, checking the isolation state of the system again, and finding out and eliminating the pressure drop reason;
continuously pressurizing to 0.3MPa, maintaining the pressure for 4 hours, recording the pressure change condition, detecting leakage by a bubble method, immediately processing the leakage points after the leakage points are found, and processing the leakage points after pressure reduction if some leakage points can not be blocked or are not suitable to be blocked under pressure;
and (3) wrapping the flange, the valve and the nozzle on the equipment body in the system by using plastic cloth.
And 2) continuously pressurizing to 0.6MPa, simultaneously injecting helium with a certain proportion, observing the pressure change condition, taking the helium concentration of a primary loop cabin before boosting as a background value, if the helium concentration in the cabin exceeds the background value by one order of magnitude, determining that abnormal leakage occurs, searching for a leakage point by adopting a helium leakage detection method, and performing repair treatment and re-inspection on the leakage point with the leakage rate exceeding the background by one order of magnitude.
And in the step 3), continuously detecting the helium background of the related cabin/room during the period of boosting to the design pressure, when the helium background is abnormally raised, checking suspicious leakage points such as valves, flanges, welding seams and the like in the corresponding cabin/room, and if the total leakage rate does not meet the requirement, performing pressure relief and repair and rechecking.
And 4), reducing the pressure to a working pressure platform with the design pressure, checking leakage points through inspection, and if the total leakage rate does not meet the requirement, releasing the pressure, repairing and rechecking.
The invention has the beneficial effects that:
the invention is mainly innovated in that a set of leakage detection method suitable for the high-temperature gas cooled reactor pressure test period is established by fully combining the advantages of the existing leakage detection method and adopting different leakage detection methods under different pressure platforms.
Large leak points can be checked by a bubble method or an ultrasonic method under 0.3 MPa.
And (4) repairing and rechecking the leakage points with the leakage rate exceeding the background by one order of magnitude under 0.6 MPa.
And continuously detecting the helium background of the related cabin and the room during the period of boosting the pressure to the design pressure at 0.6MPa, and if the helium background is abnormally boosted, checking suspicious leakage points such as valves, flanges and the like in the corresponding cabin and the room.
And (5) reducing the pressure to the designed pressure, and checking a leakage point. And if the total leakage rate does not meet the requirement, performing pressure relief and repairing and rechecking.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example (b):
and (3) pressurizing the pressure container to 0.15MPa, maintaining the pressure for 30min, observing the pressure change condition, and if the pressure is stable, continuously and gradually boosting the pressure, boosting the pressure according to a target value of 10 percent, and observing the pressure change condition. If the pressure is not stable, the system isolation state is checked again, and the pressure drop reason is found out and eliminated.
And continuously pressurizing to 0.3MPa, maintaining the pressure for 4 hours, recording the pressure change condition, detecting the leakage by using a bubble method, and immediately processing the leakage point after the leakage point is found. Some leakage points can not be blocked or are not suitable to be blocked under pressure, and the pressure is reduced for treatment.
And (3) wrapping the flange, the valve and the nozzle on the equipment body in the system by using plastic cloth.
Continuously pressurizing to 0.6MPa, simultaneously injecting helium with a certain proportion, and observing the pressure change condition. And taking the helium concentration of a primary circuit cabin before boosting as a background value, if the helium concentration in the cabin exceeds the background value by one magnitude, determining that abnormal leakage occurs, and searching for a leakage point by adopting a helium leakage detection method. And (4) repairing and rechecking the leakage points with the leakage rate exceeding the background by one order of magnitude.
During the boost to the design pressure, a continuous detection of the relevant cabin/room helium background is performed. And when the background of the helium abnormally rises, suspicious leakage points such as valves, flanges, welding seams and the like in the corresponding cabin/room are checked. And if the total leakage rate does not meet the requirement, performing pressure relief and repairing and rechecking.
And (5) reducing the pressure to a working pressure platform of the design pressure, and checking leakage points through inspection. And if the total leakage rate does not meet the requirement, performing pressure relief and repairing and rechecking.
The method and the device have the advantages that comprehensive local leakage inspection is carried out on the pressure boundary under the cold working condition, and the success rate of the leakage test under the hot working condition is improved.
Claims (7)
1. A sealing detection method for a large pressure vessel air pressure test is characterized by comprising the following steps;
1) pressurizing the pressure container, and searching for a leakage point;
2) continuously pressurizing the pressure container on the basis of the step 1), and searching for a leakage point;
3) continuously detecting helium background of related cabins and rooms when the pressure vessel is pressurized to about the design pressure, and if the helium background is abnormally raised, checking suspicious leakage points such as valves, flanges, welding seams and the like in the corresponding cabins/rooms;
4) and when the pressure is increased to the test pressure and then is reduced to the design pressure, the leakage point is checked through routing inspection.
2. The method for detecting the sealing of the large pressure vessel in the air pressure test according to claim 1, wherein in the step 1), the pressure vessel is pressurized to 0.3MPa, and a leak point is searched by adopting a bubble method or an ultrasonic method.
3. The method for detecting the sealing of the large pressure vessel in the air pressure test according to claim 1, wherein in the step 2), the pressure vessel is pressurized to 0.6MPa, and a helium leak detection method is adopted to search a leak point.
4. The method for detecting the sealing of the air pressure test of the large-sized pressure vessel according to claim 1, wherein in the step 1), the system is pressurized to 0.15MPa, the pressure is maintained for 30min, the pressure change condition is observed, if the pressure is stable, the pressure can be continuously and gradually increased, the pressure is increased according to a 10% target value, the pressure change condition is observed, and if the pressure cannot be stable, the isolation state of the system is checked again, and the reason of the pressure drop is found out and eliminated;
continuously pressurizing to 0.3MPa, maintaining the pressure for 4 hours, recording the pressure change condition, detecting leakage by a bubble method, immediately processing the leakage points after the leakage points are found, and processing the leakage points after pressure reduction if some leakage points can not be blocked or are not suitable to be blocked under pressure;
and (3) wrapping the flange, the valve and the nozzle on the equipment body in the system by using plastic cloth.
5. The method for detecting the sealing of the air pressure test of the large-sized pressure vessel according to claim 1, wherein in the step 2), the pressurization is continuously carried out to 0.6MPa, helium with a certain proportion is injected at the same time, the pressure change condition is observed, the helium concentration of a primary circuit cabin before the pressurization is taken as a background value, if the helium concentration in the cabin exceeds the background value by one order of magnitude, abnormal leakage is considered to occur, at the moment, a helium leakage detection method is adopted to search for a leakage point, and the leakage point with the leakage rate exceeding the background by one order of magnitude is repaired and rechecked.
6. The method for detecting the sealing of the air pressure test of the large-sized pressure container according to claim 1, wherein in the step 3), during the period of boosting the pressure to the design pressure, the helium background of the relevant chamber/room is continuously detected, when the helium background is abnormally raised, suspicious leakage points such as valves, flanges, welding seams and the like in the corresponding chamber/room are checked, and if the total leakage rate does not meet the requirement, the pressure is released for repair and rechecking.
7. The sealing detection method for the air pressure test of the large-sized pressure container according to claim 1, wherein in the step 4), the pressure is reduced to a working pressure platform with the designed pressure, a leakage point is inspected through inspection, and if the total leakage rate does not meet the requirement, the pressure is released for repair and recheck.
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Cited By (6)
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| CN111337199A (en) * | 2020-04-23 | 2020-06-26 | 张康乐 | Pressure vessel gas tightness detecting system |
| CN111579170A (en) * | 2020-05-27 | 2020-08-25 | 国网天津市电力公司电力科学研究院 | Comprehensive leak detection testing device and method for steam turbine vacuum system |
| CN112461460A (en) * | 2020-10-20 | 2021-03-09 | 江苏利柏特股份有限公司 | Method for detecting leakage point in air tightness test in modular production |
| CN113295343A (en) * | 2021-04-21 | 2021-08-24 | 国核电站运行服务技术有限公司 | Container leak detection process test device and method |
| CN113421674A (en) * | 2021-05-26 | 2021-09-21 | 华能山东石岛湾核电有限公司 | Method and device for calculating leakage rate of primary loop during high-temperature reactor cold test |
| CN114216623A (en) * | 2021-11-26 | 2022-03-22 | 华能山东石岛湾核电有限公司 | Sealing performance test device and method for sealing ring dislocation |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111337199A (en) * | 2020-04-23 | 2020-06-26 | 张康乐 | Pressure vessel gas tightness detecting system |
| CN111579170A (en) * | 2020-05-27 | 2020-08-25 | 国网天津市电力公司电力科学研究院 | Comprehensive leak detection testing device and method for steam turbine vacuum system |
| CN112461460A (en) * | 2020-10-20 | 2021-03-09 | 江苏利柏特股份有限公司 | Method for detecting leakage point in air tightness test in modular production |
| CN113295343A (en) * | 2021-04-21 | 2021-08-24 | 国核电站运行服务技术有限公司 | Container leak detection process test device and method |
| CN113295343B (en) * | 2021-04-21 | 2024-02-20 | 国核电站运行服务技术有限公司 | Container leak detection process test device and method |
| CN113421674A (en) * | 2021-05-26 | 2021-09-21 | 华能山东石岛湾核电有限公司 | Method and device for calculating leakage rate of primary loop during high-temperature reactor cold test |
| CN113421674B (en) * | 2021-05-26 | 2022-10-18 | 华能山东石岛湾核电有限公司 | Method and device for calculating leakage rate of primary loop during high-temperature reactor cold test |
| CN114216623A (en) * | 2021-11-26 | 2022-03-22 | 华能山东石岛湾核电有限公司 | Sealing performance test device and method for sealing ring dislocation |
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