CN101424579A - Trace air seal leakage method - Google Patents
Trace air seal leakage method Download PDFInfo
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- CN101424579A CN101424579A CNA2008102042249A CN200810204224A CN101424579A CN 101424579 A CN101424579 A CN 101424579A CN A2008102042249 A CNA2008102042249 A CN A2008102042249A CN 200810204224 A CN200810204224 A CN 200810204224A CN 101424579 A CN101424579 A CN 101424579A
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Abstract
The invention relates to a method for sealing the leakage of small amount of air. The method is characterized in that: a pipeline is connected, one end of an equipment gate sealing cavity is connected with a release valve, the other end of the equipment gate sealing cavity is connected with one end of a buffer tank through the pipeline, the other end of the buffer tank is connected with one end of an air leakage tester, the other end of the air leakage tester is connected with one end of a spherical connecting rod through a disconnecting valve, and the other end of the spherical connecting rod is connected with an air bottle through a reducing valve; the soap bubble experiment on the pipeline is performed to detect the leak tightness of the pipeline; the leakage amount is calculated, according to the requirement of the experiment, a computer is connected with the tester and the experimental data is inputted by the computer; the air bottle is opened, the equipment gate sealing cavity is pressurized and added with nitrogen. The method has the advantages that the air sealing leakage amount can be measured accurately to the utmost degree, and the computer can help people understand the air leakage amount curve, the instantaneous leakage amount and the data record in real time during the whole experiment process.
Description
Technical field
The present invention relates to a kind of method of trace air seal leakage, be mainly used in the nuclear power station industry, belong to the Leak Off Test (LOT) technical field.
Background technology
Equipment gate on the containment of nuclear power station when reactor operation, is in closed condition, is the part of containment integral sealing; It can bear the load (temperature, pressure and concrete force displacement etc.) of various design basis accidents, keeps the integrality and the sealing of containment.According to design specifications, the sealing of equipment gate can allow micro-air to leak, and therefore needs to carry out the reliability that seal leakage tests Authentication devices in equipment gate manufacture process.Test method commonly used at present is:
1. with two tensimeters, it is qualified to judge whether according to the reading value of manometric pointer, because manometric range error and visual error, the not high and data of this precision of method can not recorded and stored;
2. it is qualified that air leak-testing instrument commonly used then can only judge whether according to instantaneous air leakage, for allowing the micro-air leakage situation then can't judge.
Summary of the invention
The method that the purpose of this invention is to provide a kind of trace air seal leakage.
Can at utmost accurately measure the air seal leakage amount and can adopt computing machine to carry out experimental technique and device that data recording is preserved.
For realizing above purpose, technical scheme of the present invention provides a kind of method of trace air seal leakage, it is characterized in that, its method is:
The first step, connect pipeline: the end at equipment gate annular seal space connects air release, an end that connects surge tank at the other end of equipment gate annular seal space by pipeline, the other end of surge tank is connected with air leak-testing instrument one end, the air leak-testing instrument other end is connected with an end of spherical connecting link by stop valve, and the other end of spherical connecting link is connected with gas cylinder by reduction valve;
In second step, pipeline is carried out soap bubble test to check the sealing of pipeline;
In the 3rd step, leakage rate is calculated
Leakage rate from double-seal gasket is calculated P by following computing formula
2
Wherein:
R
Leak: the every linear meter(lin.m.) leakage rate 0.01Ncm that allows in the test
3/ ms * 3.5bar=0.035Ncm
3/ ms
P
0: standard atmospheric pressure;
P
1: initial trial pressure;
P
2: the final pressure that the test back allows;
T
0：0℃；
T
1: the test initial temperature;
T
2: test last finishing temperature;
V: volume and testing equipment volume sum between double sealing spare;
L: the girth of double sealing spare;
H: test period
When the actual leakage rate of calculating by computing formula in 30 minutes less than 1483.20Ncm
3, i.e. Δ P＜0.279bar, stand the test.
The calculating of described surge tank volume, the volume of surge tank is 3-4 times of the leakage rate of permission.
In the 4th step, by testing requirements, computing machine is connected with tester, and by computing machine input test figure;
The 5th step, open gas cylinder, to equipment gate annular seal space pressurized nitrogen, under the test pressure of gauge pressure 0.35MPa, slip is that the every 0.1MPa leakage rate of every linear meter(lin.m.) double sealing is not more than 0.01Ncm
3/ s, test period is 30 minutes, and test is at room temperature carried out, and the temperature difference can not surpass 5 ℃ during test, if surpass 5 ℃, must test again;
The calculating of described surge tank volume, the volume of surge tank is 3-4 times of the leakage rate of permission.
The present invention changes original air leak-testing instrument into the pressure descending manner by the differential pressure type transient measurement and regularly measures, and is connected exchange and the record that carries out measurement data with computing machine; And designed test unit, the design of test unit of the present invention, key is that the inner air of tested annular seal space has not been leaked and keep-uped pressure must warranty test the time and falls under test pressure, therefore be provided with surge tank and be used to compensate air leakage rate by in the annular seal space of test equipment, the volume of surge tank is about 3.5 times of the leakage rate that allows.
Advantage of the present invention is at utmost accurately to measure the air seal leakage amount, can omnidistance grasp leakage of air discharge curve, instantaneous leakage rate and real-time data recording by computing machine in process of the test.
Description of drawings
Fig. 1 is a kind of method equipment connection diagram of trace air seal leakage;
The leakage plot that Fig. 2 shows for air seal leakage test computing machine;
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Embodiment
A kind of method of trace air seal leakage is:
The first step, connect pipeline: the end at equipment gate annular seal space 8 connects air release 9, connect an end of surge tank 6 by pipeline 7 at the other end of equipment gate annular seal space 8, the other end of surge tank 6 is connected with air leak-testing instrument 5 one ends, air leak-testing instrument 5 other ends are connected with an end of spherical connecting link 3 by stop valve 4, the other end of spherical connecting link 3 is connected with gas cylinder 1 by reduction valve
As shown in Figure 1;
In second step, pipeline is carried out soap bubble test to check the sealing of pipeline;
In the 3rd step, leakage rate is calculated
Leakage rate from double-seal gasket is calculated P by following computing formula
2
Wherein:
R
Leak: the every linear meter(lin.m.) leakage rate (0.01Ncm that allows in the test
3/ ms * 3.5bar=0.035Ncm
3/ ms)
P
0: standard atmospheric pressure (1bar)
P
1: initial trial pressure (3.5bar)
P
2: the final pressure that the test back allows
T
0: 0 ℃ (being 273K)
T
1: test initial temperature (room temperature is 20 ℃, i.e. 293K)
T
2: test last finishing temperature (room temperature is 20 ℃, i.e. 293K)
V: (cumulative volume is 5713.5cm for volume and testing equipment volume sum between double sealing spare
3)
L: the girth of double sealing spare (23.54m)
H: test period (1800S)
Calculate: P
2The Δ P=P that=3.221bar then allows
1-P
2=0.279bar/1800s
When the actual leakage rate of calculating by computing formula in 30 minutes less than 1483.20Ncm
3, i.e. Δ P＜0.279bar, stand the test.
R
leak<0.035Ncm
3/ms，1483.20N?cm
3/0.5h
Q
leak＝3.5bar×0.01N?cm
3/ms×23.54m＝0.824N?cm
3/s＝2966.40N?cm
3/h；
So 30 minutes leakage rate: V
Leak=1483.20N cm
3
The calculating of surge tank volume, the volume of surge tank is 3.5 times of the leakage rate that allows, so the volume of surge tank is designed to 5250cm
3Comprise that it is 57135cm that annular seal space, test pipeline ease up towards tested cumulative volumes such as jars
3
| Project | Seal length | Allow leakage rate | Pressure descended in 30 minutes | The pipeline volume | The annular seal space volume | The surge tank volume | The testing total volume |
| m | N?cm 3/30min | Bar/30min | cm 3 | cm 3 | cm 3 | cm 3 | |
| The equipment gate | 23.54 | 1483.20 | 0.279 | 213.5 | 250 | 5250 | 5713.5 |
When the cumulative volume that comprises surge tank, pipeline and annular seal space is approximately 5713.5cm
3, pressure descends and allowed for＜0.279bar in per 30 minutes.Pressure decline of this permission 0.279bar/30 minute and 1483.20N cm
3/ 30 minutes leakage flow is an equivalent, as shown in Figure 2, is the leakage plot of air seal leakage test computing machine demonstration; The interval that the 0-40 two-lines shows is the qualified zone of leakage rate.
In the 4th step, by testing requirements, computing machine is connected with tester, imports test figure by computing machine: test pressure: 340; DEL:0; CHG:20; BAL:10DET:1800; END:2; LIMIT+:35.5; LIMIT-:4;
The 5th step, open gas cylinder 1, to equipment gate annular seal space 8 pressurized nitrogens, under the test pressure of gauge pressure 0.35MPa, slip is that the every 0.1MPa leakage rate of every linear meter(lin.m.) double sealing is not more than 0.01Ncm
3/ s, test period is 30 minutes, and test is at room temperature carried out, and the temperature difference can not surpass 5 ℃ during test, if surpass 5 ℃, must test again.
Claims (2)
1. the method for a trace air seal leakage is characterized in that, its method is:
The first step, connect pipeline: the end at equipment gate annular seal space (8) connects air release (9), an end that connects surge tank (6) at the other end of equipment gate annular seal space (8) by pipeline (7), the other end of surge tank (6) is connected with air leak-testing instrument (5) one ends, air leak-testing instrument (5) other end is connected with an end of spherical connecting link (3) by stop valve (4), and the other end of spherical connecting link (3) is connected with gas cylinder (1) by reduction valve;
In second step, pipeline is carried out soap bubble test to check the sealing of pipeline;
In the 3rd step, leakage rate is calculated
Leakage rate from double-seal gasket is calculated P by following computing formula
2
Wherein:
R
Leak: the every linear meter(lin.m.) leakage rate 0.01Ncm that allows in the test
3/ ms * 3.5bar=0.035Ncm
3/ ms
P
0: standard atmospheric pressure;
P
1: initial trial pressure;
P
2: the final pressure that the test back allows;
T
0：0℃；
T
1: the test initial temperature;
T
2: test last finishing temperature;
V: volume and testing equipment volume sum between double sealing spare;
L: the girth of double sealing spare;
H: test period
When the actual leakage rate of calculating by computing formula in 30 minutes less than 1483.20Ncm
3, i.e. Δ P＜0.279bar, stand the test.
In the 4th step, by testing requirements, computing machine is connected with tester and imports test figure by computing machine;
The 5th step, open gas cylinder (1), to equipment gate annular seal space (8) pressurized nitrogen, under the test pressure of gauge pressure 0.35MPa, slip is that the every 0.1MPa leakage rate of every linear meter(lin.m.) double sealing is not more than 0.01Ncm
3/ s, test period is 30 minutes, and test is at room temperature carried out, and the temperature difference can not surpass 5 ℃ during test, if surpass 5 ℃, must test again.
2. the method for a kind of trace air seal leakage according to claim 1 is characterized in that, the calculating of surge tank volume, and the volume of surge tank is 3-4 times of the leakage rate of permission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102042249A CN101424579A (en) | 2008-12-09 | 2008-12-09 | Trace air seal leakage method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102042249A CN101424579A (en) | 2008-12-09 | 2008-12-09 | Trace air seal leakage method |
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| Publication Number | Publication Date |
|---|---|
| CN101424579A true CN101424579A (en) | 2009-05-06 |
Family
ID=40615327
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101881690A (en) * | 2010-06-09 | 2010-11-10 | 长春工业大学 | High-pressure closing sealed detection table and detection method for liquefied petroleum gas cylinder valve |
| CN102753950A (en) * | 2010-01-07 | 2012-10-24 | 阿尔古科技公司 | Test pressurisation device for hose |
| CN102928182A (en) * | 2012-11-01 | 2013-02-13 | 辽宁省电力有限公司电力科学研究院 | Leakage test device for mechanical penetration piece of nuclear power plant containment vessel |
| CN103151081A (en) * | 2013-02-21 | 2013-06-12 | 中国核电工程有限公司 | Personnel gate sealing performance and leakage rate real-time detection system, and method thereof |
| CN104101469A (en) * | 2014-06-19 | 2014-10-15 | 佛山市美的清湖净水设备有限公司 | Leakage detection device of ultrafiltration water purification equipment and control method |
| CN104931214A (en) * | 2015-07-06 | 2015-09-23 | 中国第一汽车股份有限公司 | A machine oil cooler leakage detection method |
| CN110494730A (en) * | 2017-03-31 | 2019-11-22 | 芝浦机械电子装置股份有限公司 | The gas leak detection apparatus of heating tube and the gas leak detection method of heating tube |
| CN112556950A (en) * | 2020-12-30 | 2021-03-26 | 江苏核电有限公司 | Device and method for detecting sealing performance of main joint surface of reactor pressure vessel |
| CN112924110A (en) * | 2021-03-18 | 2021-06-08 | 中广核研究院有限公司 | Sealing device detection method, device, equipment and storage medium |
-
2008
- 2008-12-09 CN CNA2008102042249A patent/CN101424579A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102753950B (en) * | 2010-01-07 | 2015-03-04 | 阿尔古科技公司 | Test pressurisation device for hose |
| CN102753950A (en) * | 2010-01-07 | 2012-10-24 | 阿尔古科技公司 | Test pressurisation device for hose |
| CN101881690B (en) * | 2010-06-09 | 2012-05-30 | 长春工业大学 | High-pressure closing sealed detection table and detection method for liquefied petroleum gas cylinder valve |
| CN101881690A (en) * | 2010-06-09 | 2010-11-10 | 长春工业大学 | High-pressure closing sealed detection table and detection method for liquefied petroleum gas cylinder valve |
| CN102928182A (en) * | 2012-11-01 | 2013-02-13 | 辽宁省电力有限公司电力科学研究院 | Leakage test device for mechanical penetration piece of nuclear power plant containment vessel |
| CN102928182B (en) * | 2012-11-01 | 2016-02-03 | 辽宁省电力有限公司电力科学研究院 | Leakage test device for mechanical penetration piece of nuclear power plant containment vessel |
| CN103151081A (en) * | 2013-02-21 | 2013-06-12 | 中国核电工程有限公司 | Personnel gate sealing performance and leakage rate real-time detection system, and method thereof |
| CN103151081B (en) * | 2013-02-21 | 2015-11-25 | 中国核电工程有限公司 | Access lock leak check and slip real-time detecting system and method |
| CN104101469A (en) * | 2014-06-19 | 2014-10-15 | 佛山市美的清湖净水设备有限公司 | Leakage detection device of ultrafiltration water purification equipment and control method |
| CN104931214A (en) * | 2015-07-06 | 2015-09-23 | 中国第一汽车股份有限公司 | A machine oil cooler leakage detection method |
| CN110494730A (en) * | 2017-03-31 | 2019-11-22 | 芝浦机械电子装置股份有限公司 | The gas leak detection apparatus of heating tube and the gas leak detection method of heating tube |
| CN112556950A (en) * | 2020-12-30 | 2021-03-26 | 江苏核电有限公司 | Device and method for detecting sealing performance of main joint surface of reactor pressure vessel |
| CN112924110A (en) * | 2021-03-18 | 2021-06-08 | 中广核研究院有限公司 | Sealing device detection method, device, equipment and storage medium |
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Open date: 20090506 |