WO2009136037A2 - Procede et dispositif de controle de l'etancheite d'un contenant - Google Patents
Procede et dispositif de controle de l'etancheite d'un contenant Download PDFInfo
- Publication number
- WO2009136037A2 WO2009136037A2 PCT/FR2009/050567 FR2009050567W WO2009136037A2 WO 2009136037 A2 WO2009136037 A2 WO 2009136037A2 FR 2009050567 W FR2009050567 W FR 2009050567W WO 2009136037 A2 WO2009136037 A2 WO 2009136037A2
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- WIPO (PCT)
- Prior art keywords
- volatile organic
- container
- chamber
- gas
- organic compound
- Prior art date
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Classifications
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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
- G01M3/226—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
- G01M3/229—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 removably mounted in a test cell
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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
-
- 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
Definitions
- the present invention relates to the control of the tightness of a container during an industrial manufacturing process, and the device for its implementation.
- Container tightness control can be performed according to different detection methods.
- a first known control method is the so-called "pressure variation test” method in which it starts by establishing a determined overpressure in the test container.
- a gas flow is injected into the test container so as to maintain the high internal pressure in the container.
- the value of the gas flow necessary to maintain this equilibrium makes it possible to deduce the corresponding flow of leaks.
- one begins by establishing a determined depression in the test container, and then closes the container.
- the pressure increases and the measurement of this increase in pressure makes it possible to deduce the value of a leak.
- the sensitivity depends on the volume of the container to be tested, which is particularly detrimental in the case of test containers having flexible walls and for which the internal volume may vary during the control process.
- the time required to carry out the measurement is too long for its integration into a high-speed industrial process, as for example in the field of the automotive industry.
- the result of the measurement is sensitive to changes in the temperature of the container. The method of checking the tightness of containers to be tested by the detection of helium leaks is also known.
- the disadvantage of this method is that its use is restricted to the location of large leaks and that the sensitivity of the process is limited by the relatively high background of helium prevailing in the ambient atmosphere of the test room (the concentration residual natural helium is usually greater than 5 ppm). Moreover, the process is difficult to implement in an industrial process. In addition, the use of helium is expensive.
- the test container is placed in a sealed chamber connected firstly to a pumping unit establishing a suitable vacuum and secondly to a helium leak detector.
- the internal space of the container is connected to a helium pressurization device, and leaks are searched for by detecting the presence of helium in the internal atmosphere of the chamber via the leak detector.
- This helium leak detection method is a reliable, reproducible and high sensitivity test for accurate quantitative measurement, the process can be integrated into an industrial process. However, its implementation is binding.
- the enclosure itself must be sealed so that it can withstand a vacuum.
- the pumping devices must be adapted to the volume of the enclosure to which they are connected.
- large pumping groups are expected, which represents large investments and high maintenance costs.
- the present invention aims to provide a cheaper alternative, more sensitive thus allowing to be faster, applicable to industrial processes, even those of high speed, allowing a simple and reliable implementation.
- the subject of the invention is a method for controlling the sealing of a test container comprising: a first step during which a background noise is measured in an enclosure at atmospheric pressure, with a detector of traces of volatile organic compounds with sensibility of measurement lower or of the order of 1 ppb.
- Volatile organic compounds such as acetone, propane, butane, isobutene (or isobutylene or 2-methylpropene), ethanol, methanol, benzene, butene, propene, ethylene or PGMEA (or propylene glycol monomethyl ether acetate or 1-methoxy-2-acetoxypropane or 1-methoxy-2-propanol acetate) have many advantages.
- gaseous gases in the atmosphere include carbon atoms. They exhibit extreme volatility and poor adhesion to surfaces allowing them to be easily evacuated. It is therefore quick and easy to clean the enclosure when a leak has been detected or when the background noise is too important. In addition, they have the advantage of being already present in certain industrial containers that you wish to test such as aerosols or lighters. In addition, these gases are present in low residual concentration in the ambient air (of the order of 10 ppb). In addition, simple detectors of volatile organic compounds with a very high measurement sensitivity, of the order of 1 ppb or less, are commercially available.
- volatile organic compounds are advantageous because: sensitive measurements can be carried out easily, quickly and at a lower cost, that is to say without a mass spectrometer but thanks to the use on the one hand, a corresponding detector of traces of volatile organic compounds of high sensitivity and secondly a stirring means for homogenizing the internal environment of the chamber so as to more easily detect a change in tracer gas concentration, and can easily and cheaply depollute, that is to say without pumping device, the internal atmosphere of the chamber when the measurement of the background noise is greater than a predetermined threshold.
- the concentration of the background noise is of the order of 5000ppb for a helium tracer gas present at 100%, 500 ppb for a tracer gas comprising 5% hydrogen and 50 ppb for a tracer gas comprising one or more volatile organic compounds.
- these measurements are obtained after only 4 seconds of accumulation in said volume for the latter instead of 48 seconds for a tracer gas comprising 5% hydrogen and 24 seconds for a tracer gas helium. Therefore, the measurement obtained is six (bis faster than detection by helium tracer gas and ten times faster than detection by hydrogen tracer gas.
- control method may comprise one or more of the following characteristics: the control method comprises an additional intermediate step before the second step, during which a tracer gas comprising a volatile organic compound is injected into said container at a higher gas pressure at atmospheric pressure, the tracer gas is a neutral gas such as razote. with a low concentration, for example less than 6%, preferably between 1% and 6% and advantageously equal to 5.9%, of at least one volatile organic compound, in particular isobutene, the method of control comprises a preparatory calibration step during which the detector of traces of volatile organic compounds is calibrated with respect to the volume of the chamber, by injecting a calibrated quantity of volatile organic compounds into the chamber.
- the control method comprises an additional intermediate step before the second step, during which a tracer gas comprising a volatile organic compound is injected into said container at a higher gas pressure at atmospheric pressure, the tracer gas is a neutral gas such as razote. with a low concentration, for example less than 6%, preferably between 1% and 6% and advantageously
- the invention also relates to a device for testing the tightness of a test container comprising an atmospheric pressure chamber intended to receive a container to be tested, and comprising a trace detector of volatile organic compounds having a lower measurement sensitivity or of the order of 1 ppb, fluidly connected to the chamber, a depollution means, a gas stirring means and a processing unit able to compare the measurement results of said detector to provide information on the sealing of said container to be tested and able to implement the control method as previously described
- the control device may comprise one or more of the following characteristics: the control device comprises a pressurization system for injecting into said test container a tracer gas comprising a volatile organic compound at a pressure greater than the atmospheric pressure of the enclosure for the implementation of the control method as described above the depollution means comprises a pollution control chamber provided with a valve and a volatile organic compound filter, the valve being able to isolate the internal atmosphere of the enclosure of said filter, for the implementation of the decontamination step of the control method as described above the depollution means comprises an additional depollution chamber successively comprising a valve, a gas drive means.
- the two depollution chambers being configured to be able to circulate a cleaning gas from a gas inlet of the first depollution chamber to a gas outlet of a second chamber of pollution
- the enclosure comprises a bypass line on which the trace volatile organic compounds detector is connected and which comprises in particular a gas flow means, such as a fan.
- FIG. 1 is a diagram of a device for controlling the sealing.
- FIG. 2 is a diagram of an alternative embodiment of the device for checking the tightness of FIG. 1,
- FIG. 3 represents a flowchart of a sealing control method of said control device and
- FIG. 4 is a graph showing a concentration of tracer gas as a function of time in the sealing control device of the FIG. 2.
- identical elements bear the same reference numbers.
- the steps of the sealing control process are numbered starting from 100.
- the present invention relates to a method and a control device for the étancnéotti for the realization of a sealing control of a container to be tested during an industrial manufacturing process.
- a first application relates to the control of the tightness of test containers designed to enclose a body in solid, liquid and / or gaseous form naturally releasing a volatile organic compound.
- As container contains, for example, an electrical transformer or a circuit breaker for containing an industrial oil which continuously releases one or more volatile organic compounds, or a tube for containing a cosmetic releasing a volatile organic compound, such as a stick of lipstick.
- a second application relates to the leak test of test containers comprising one or more channels for circulating a fluid or a storage space for a fluid, such as a liquid, a gas or a mixture of liquid and water. gas.
- containers include a fuel tank or a heat exchanger, particularly for an air conditioning system.
- the method and the control device apply to any container for solid and / or solid fluids provided with at least one defined internal space whose sealing is to be checked by detecting the possible presence of a fluid. leak.
- the method and the control device also apply to simultaneous control of several different containers.
- Figure 1 shows a sealing control device 1 made according to a first embodiment.
- the test container 3 is designed to enclose a body in solid, liquid and / or gaseous form, which, by its composition, naturally and continuously releases a volatile organic compound.
- the control device 1 comprises an enclosure 5 intended to receive the container 3 to be tested, a detector 7 of traces of volatile organic compounds, a depollution means and a processing unit 9 able to compare the measurement results of said detector 7 to provide information on sealing the container to be tested 3.
- trace detector is meant a detector which has a high sensitivity, to detect the presence of volatile organic compounds even if they are present at a concentration less than 0.1 ppm.
- the volatile organic compound trace detector 7 uses the principle of photoionization ("Photo-ionization detect" in English or "PID").
- the internal atmosphere 10 of the chamber 5 may be to form ambient atmospheric pressure of the test room 14.
- the enclosure 5 does not have to satisfy the particular mechanical and sealing constraints required for a vacuum resistance.
- expensive pumping installations are not necessary for the creation of a vacuum in the enclosure 5.
- the walls 16 may be formed for example by an envelope thin metal.
- the walls 16 of the enclosure 5 preferably comprise a material having a neutral behavior vis-à-vis the volatile organic compounds, not releasing, adsorbing and absorbing volatile organic compounds.
- the sealing conditions of the enclosure 5 being minimal (it is simply desired to have a constant internal atmosphere), it can be provided alternatively a deformable or flexible wall 1 ⁇ , for example plastic, such as a tarpaulin .
- a tarpaulin is particularly suitable for deterrent control of bulky containers 3 and allows easy and easy adaptation to containers 3 having different sizes or shapes.
- the internal atmosphere 10 of the enclosure 5 is fluidly connected to the trace detector 7 so as to detect the presence of volatile organic compounds in the enclosure 5.
- the enclosure 5 further comprises a bypass line 11 on which the trace detector of volatile organic compounds 7 is connected.
- the bypass line 11 includes a gas flow means 13, such as a fan. This ensures that the internal atmosphere 10 of the chamber 5 flows to the trace detector 7 to be measured.
- the gas flow means 13 is configured such that the flow of gases at the entrance of the trace detector 7 is in laminar flow.
- the trace detector 7 is capable of measuring, in real time, at least one type of volatile organic compound when it is present at a concentration of less than 0.1 ppm ("part per million" in English or millionth in French, ie 10 * 6 ) with a sensitivity of less than or equal to 1 ppb.
- the detector 7 even has an even greater sensitivity so that the presence of all the volatile organic compounds, such as acetone, butane, methanol, ethanol, isobutene, propane, benzene, butene, propene. r ⁇ thylène or PGMEA can be detected with a concentration of ppb ( "part per trillion” in English or milliardtème French or 10 -8) or even ppt (part per trillion c "in English or in French billionth. 10 '12 ).
- ppb "part per trillion” in English or milliardtdiag French or 10 -8) or even ppt (part per trillion c "in English or in French billionth. 10 '12 ).
- the detector 7 is connected to the processing unit 9 to transmit to the latter an output signal representative of the measurement made in the enclosure 5.
- the volatile organic compound contained in the container 3 can be detected in the event of a leak in the container 3 which will cause leakage of the tracer gas detectable by the detector 7.
- the volume of containment 5 has dimensions slightly greater than those of the container 3 to be tested, in order to reduce the measurement volume 18 of the enclosure 5 that may contain the volatile organic compound from a leak and thereby improve the response time and the sensitivity of the measurement, the measurement volume 18 being equal to the internal volume of the chamber 5 to which the volume of the container 3 has been subtracted.
- the control device comprises a gas stirring means 20, such as a fan making it possible to mix and mix the atmosphere of the measuring volume 18. This also contributes to improving the response time, as this prevents the compound volatile organic leaked into the chamber 5 remains localized near the leakage leakage caused. On the contrary, it is spread by the stirring means 20 in the internal atmosphere 10 of the chamber 5, to make a homogeneous measurement and to detect changes in background noise concentrations.
- the depollution means makes it possible to depollute the internal atmosphere 10 of the enclosure S, in order to reduce the background noise by implementing a depollution step.
- the concentration of volatile organic compounds is reduced to a value of less than 10 ppb, so that the residual concentration of volatile organic compounds is of the order of that present in the ambient air.
- the measurement of the background noise is intended to quantify an initial concentration of volatile organic compound present in the measurement volume 18 of the chamber 5 and which is not related to a lack of sealing of the container to be tested 3.
- a demolition step is carried out before a sealing control measurement is taken when the measurement of the background noise is greater than a predetermined threshold. It is also possible to carry out a depollution step after making a measurement but before leaving the test container 3, preferably, when a leak has been detected.
- the depollution means is provided with a deposition chamber 22 comprising a valve 24 and a volatile organic compound filter 26.
- the valve 24 is fluidly connected to the enclosure 5 so as to be able to isolate the internal atmosphere 10 of the enceinto 5 of the filter 26 downstream of the valve 24.
- FIG. 1 (at the bottom of the enclosure 5) shows a depollution means according to this first embodiment.
- valve 24 is open so that the filter 26 is no longer insulated from the internal atmosphere 10 of the enclosure 5 but in contact therewith.
- the filter 26 comprises, for example, zeolites or activated charcoal, preferably heat-resistant to trap any volatile organic compounds.
- the depollution means comprises an additional depollution chamber 23.
- the sweet depollution chambers 22, 23 each comprise a valve 24, 28 connected to the chamber 5 upstream of a volatile organic compound filter 26, 32.
- the additional depollution chamber 23 further comprises a gas drive means 30, such as a fan, disposed between the valve 28 and the volatile organic compound filter 32 (as shown at the top of Figure 1).
- a gas drive means 30, such as a fan disposed between the valve 28 and the volatile organic compound filter 32 (as shown at the top of Figure 1).
- the two pollution control chambers 22, 23 are preferably arranged facing each other so as to be able to circulate a cleaning gas from a gas inlet E connected upstream of the filter 32 to the pollution control chamber 23 to a gas outlet S connected downstream of the filter 26 of the pollution chamber 22.
- the cleaning gas is a gas free of volatile organic compounds such as, for example, nitrogen.
- the gas is injected at the gas inlet E.
- valves 24 and 28 are opened simultaneously so that the filters 26 and 32 are no longer isolated. internal atmosphere 10 of the enclosure 5 but in contact therewith.
- the gas drive means 30 disposed between the valve 28 and the filter 32, is then operated to circulate the cleaning gas from the gas inlet E of the pollution chamber 23 to the gas outlet S of the disposition chamber 22.
- the gas thus successively passes through the filter 32, from which filtered out any impurities in volatile organic compounds, then passes through the internal atmosphere 10 of the enclosure 5.
- the cleaning gas then flows to the second depollution chamber 22 by carrying with it any traces of volatile organic compounds from the internal atmosphere 10 of the enclosure 5.
- the volatile organic compounds are then trapped by the filter 26.
- the depoilution means may comprise means for heating the container 3 and the walls 16 of the chamber 5 when they are metallic, to facilitate and accelerate the degassing of the volatile organic compounds of the walls 16 and thus reduce the residual amount volatile organic compounds. it is also conceivable for the depollution means to be produced by a gas injection means free of volatile organic compounds to sweep the internal atmosphere 10 of the enclosure 5 (not shown).
- the pollution control means is advantageously connected to the processing unit ⁇ which is furthermore configured to control its operation according to the course of the steps of the control method.
- FIG. 2 represents an alternative embodiment of the control device 1 of FIG. 1.
- This embodiment variant applies to a test container 3 for fluids and / or solids comprising at least one internal space 8 adapted to receive a fluid and / or a solid, delimited by a wall 12 whose defect is to be detected. seals by detecting the possible presence of a leak when a tracer gas is injected into the container 3.
- the container to be tested 3 is a heat exchanger such as an engine cooling radiator, a heating radiator or an oil or gasoline cooler or an air conditioning evaporator / condenser.
- It comprises an inlet pipe 34 and an outlet pipe 36.
- the watertightness control device 1 comprises a pressurization system 38 for injecting into the container 3, a tracer gas comprising a volatile organic compound, at a pressure greater than the atmospheric pressure of the pregnant 5.
- the pressurization system 38 is fluidly connected, on the one hand, to the inlet 34 of the container 3 placed in the enclosure 5 and, on the other hand, to the outlet 36.
- the tracer gas under a pressure greater than the atmospheric pressure of the chamber 5, that is to say greater than about 1013 hPa.
- the processing unit 9 is connected to the pressurization system 38 so as to control a tracer gas injection cycle in the container 3.
- the pressurization system 38 comprises a tracer gas recycling means. It can also be provided that the pressurizing system 38 comprises a tracer gas treatment means to avoid polluting the ambient atmosphere of the test room 14.
- this tracer gas if a tracer gas containing a neutral gas and on the other hand at least one volatile organic compound, this tracer gas, in particular, is injected at a pressure greater than the atmospheric pressure into the container 3. the volatile organic compound can be detected in the event of a leakage of the container 3 by the detector 7.
- the processing unit 9 is configured to process and exploit the measurement results of the trace detector 7 and to implement the control method 100.
- the processing unit 9 is further configured to send a signal representative of the progress of the control method 100, to a control unit of the industrial manufacturing process, so as to manage the timing of the container to be tested 3.
- the flowchart of FIG. 3 illustrates the method of controlling the élanch ⁇ itè 100.
- a preparatory calibration step 101 is first provided, over which the trace detector 7 of volatile organic compounds is calibrated with respect to the enclosure 5, by injecting a calibrated quantity of organic compounds. volatile in the enclosure 5.
- the preparatory calibration step 101 makes it possible to compensate for any measurement drift of the trace detector of volatile organic compounds 7 with respect to the enclosure 5.
- the preparatory calibration step 101 is preferably carried out after a modification of the control device 1 or after a predefined number of containers 3 tested.
- test container 3 is placed in the enclosure 5.
- a background noise is measured in the chamber 5 at atmospheric pressure, with the trace detector of volatile organic compounds 7.
- the measurement of the background noise is the measurement of the initial concentration of volatile organic compounds present in the chamber 5.
- the internal atmosphere 10 of the chamber 5 is advantageously depolluted during an intermediate decontamination step 103 (FIG. 3).
- the internal atmosphere 10 of the chamber 5 is only decontaminated when the background noise is greater than a predetermined threshold, in order to guarantee a ratio signal on noise of the acceptable measurement.
- the intermediate decontamination step 103 is implemented until a background noise is obtained making it possible to carry out a significant measurement of the concentration of volatile organic compounds.
- the method control 100 implements an additional intermediate step 104, during which the tracer gas is injected into said container 3 at a gas pressure higher than the atmospheric pressure.
- the tracer gas is a mixture comprising a neutral gas such as nitrogen, with a low concentration, for example less than 6%, preferably between 1% and 6% and advantageously equal to 5.9% of minus one volatile organic compound, especially isobutene.
- the isobutene concentration is below the flammability threshold.
- ATEX so-called "ATEX" regulation
- said container 3 already has in its internal space a degassing body, because of its composition, a volatile organic compound.
- the container is an electrical transformer or a circuit breaker and includes an industrial oil based volatile organic compounds.
- the container is a tube of lipstick and comprises a cosmetic based on volatile organic compounds.
- the container 3 comprises an internal space 8 for fluids, such as a reservoir or a heat exchanger, which has previously been filled with a tracer gas comprising a volatile organic compound.
- the gas stirring means 20 is started in order to obtain a steady state. flow of fluids and thus quickly detect the presence of a leak, if any.
- a volatile organic compound concentration is measured in the atmospheric pressure vessel 5 receiving said container 3, with the volatile organic compound trace detector 7 and the measurement of the noise of background with the measurement of the concentration of volatile organic compound, so as to detect a leakage of said test container 3.
- a variation of the volatile organic compound concentration is measured as a function of a predefined time difference, so as to determine the slope of the measured curve.
- the slope of the curve is proportional to the total leakage flow of the walls 12 of the container 3.
- the slope is also a function of the measurement volume 18. It is therefore relatively easy to obtain from the calculation of this slope, a quantitative value of leakage flow of the container 3. It is thus possible to estimate the extent of the leakage of the container 3.
- the container 3 When the slope is greater than a predetermined threshold then the container 3 is intended for rebus or repair.
- a leak is therefore a leak proof proven in the case where the volatile organic compound concentration is greater than the background noise, with an increase over time greater than a predefined threshold, defining a sealing criterion.
- the variation of the concentration of volatile organic compound is greater than the predefined threshold, it is concluded that there is a leak and thus a leak of the container 3. The latter can then be removed from the process. industrial manufacturing.
- control method 100 is completed.
- An additional depollution step 106 may be provided for the enclosure 5 when a leak has been detected, before removing the container 3 from the enclosure 5.
- the deposition step 106 is carried out until the concentration of volatile organic compound is lowered to a value equivalent to that prevailing in the test room 14.
- the processing unit then sends a signal to the control unit of the industrial manufacturing process, to indicate that the control device 1 of the seal is again available for receiving a new container to be tested 3 .
- the method 100 for checking the tightness of a container to be tested 3 has many advantages.
- the volatility of the volatile organic compounds makes it possible to direct the tracer gas towards the detector 7 or to evacuate it easily from the enclosure 5, via a means of pollution control, by simply driving the gases at atmospheric pressure.
- FIG. 4 is a graph showing an example of a change in volatile organic compound concentration as a function of time during a leak test method 100 on a container 3 presenting a leakage fault.
- the curve of the graph is obtained from the measurement coming from the detector 7 of the control device 1 of FIG.
- the initial time t0 of the graph corresponds to the beginning of the first step 102 during which a background noise is measured.
- a concentration of the order of 30 ppb of isobutene is measured in the measurement volume 18. This level corresponds to an acceptable background noise for the particular test conditions in which the enclosure 5 is a radiator cooling of a volume of the order of thirty liters.
- the tracer gas is introduced into the test container 3 at a gas pressure higher than the atmospheric pressure.
- the variation of the volatile organic compound concentration is then determined over thirty test seconds so as to determine the slope of the curve.
- the tracer gas injection is stopped as soon as the slope of the curve reaches a predefined slope, so as to stop the injection quickly in case of proven leakage and thus take care not to degrade too much the level of the background noise. .
- the operation of the stirring means 20 present in enclosure 5 can also be stopped.
- a decontamination step 106 is activated (at time 13).
- depollution step 106 may be activated well before this time t3.
- the container to be tested 3 can therefore be removed from the enclosure 5.
- the sealing control method 100 is a high sensitivity process, simple and quick to implement, low cost and applicable to industrial processes.
- the result of the measurement is reliable and reproductibie. It is not sensitive to the temperature of the walls 12 of the container 3.
- control device 1 does not require a pumping unit, so it is simple to implement and low in power consumption:
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Abstract
Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/736,367 US8381577B2 (en) | 2008-04-03 | 2009-04-03 | Method and device for testing a container for leaks |
BRPI0910903A BRPI0910903A2 (pt) | 2008-04-03 | 2009-04-03 | processo e dispositivo de controle da estanqueidade de um recipiente |
CN200980120415.XA CN102047090B (zh) | 2008-04-03 | 2009-04-03 | 用于测试容器泄漏的方法和设备 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0801851A FR2929707B1 (fr) | 2008-04-03 | 2008-04-03 | Procede de controle de l'etancheite d'un contenant a tester et dispositif correspondant de mise en oeuvre |
FR0801851 | 2008-04-03 |
Publications (2)
Publication Number | Publication Date |
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WO2009136037A2 true WO2009136037A2 (fr) | 2009-11-12 |
WO2009136037A3 WO2009136037A3 (fr) | 2010-02-11 |
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ID=40030323
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/FR2009/050567 WO2009136037A2 (fr) | 2008-04-03 | 2009-04-03 | Procede et dispositif de controle de l'etancheite d'un contenant |
Country Status (6)
Country | Link |
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US (1) | US8381577B2 (fr) |
KR (1) | KR101594193B1 (fr) |
CN (1) | CN102047090B (fr) |
BR (1) | BRPI0910903A2 (fr) |
FR (1) | FR2929707B1 (fr) |
WO (1) | WO2009136037A2 (fr) |
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CN102588745B (zh) * | 2012-03-05 | 2013-07-24 | 北京化工大学 | 一种管道泄漏定位方法 |
JP2015040836A (ja) * | 2013-08-23 | 2015-03-02 | 株式会社フクダ | 水素リークテスト方法及び装置 |
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Also Published As
Publication number | Publication date |
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US8381577B2 (en) | 2013-02-26 |
CN102047090A (zh) | 2011-05-04 |
KR101594193B1 (ko) | 2016-02-15 |
KR20100129337A (ko) | 2010-12-08 |
CN102047090B (zh) | 2014-04-16 |
WO2009136037A3 (fr) | 2010-02-11 |
BRPI0910903A2 (pt) | 2015-09-29 |
FR2929707B1 (fr) | 2010-12-10 |
FR2929707A1 (fr) | 2009-10-09 |
US20110056274A1 (en) | 2011-03-10 |
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