WO2006057219A1 - タンク内液体の漏れ検知装置 - Google Patents
タンク内液体の漏れ検知装置 Download PDFInfo
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- WO2006057219A1 WO2006057219A1 PCT/JP2005/021364 JP2005021364W WO2006057219A1 WO 2006057219 A1 WO2006057219 A1 WO 2006057219A1 JP 2005021364 W JP2005021364 W JP 2005021364W WO 2006057219 A1 WO2006057219 A1 WO 2006057219A1
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- Prior art keywords
- liquid
- detection
- leak detection
- tank
- leak
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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
- G01M3/26—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
- G01M3/3254—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 using a flow detector
Definitions
- the present invention relates to an apparatus for detecting leakage of liquid in a tank, and more particularly to an apparatus for detecting a liquid leakage due to tank force by converting it into a flow based on a liquid level fluctuation of the liquid in the tank.
- Fuel oil and various liquid chemicals are stored in tanks.
- a centralized refueling system has been proposed in an apartment house.
- fuel kerosene is supplied to each dwelling unit from a centralized kerosene tank through piping.
- the tank may crack due to deterioration over time, and in this case, the liquid in the tank leaks out of the tank. It is important to detect such a situation promptly and take appropriate measures in order to prevent a flammable explosion, environmental pollution, or generation of toxic gases.
- Patent Document 1 discloses a measuring tube into which liquid in a tank is introduced and a position below the measuring tube. And measuring the flow rate of the liquid in the measurement capillary using a sensor section attached to the measurement capillary, so that a minute liquid level fluctuation of the liquid in the tank, that is, a change in the liquid level is detected. What has been disclosed is disclosed.
- an indirectly heated flow meter is used as a sensor attached to a measurement thin tube.
- the heating element is heated by energization, and a part of the generated heat is absorbed by the liquid, and the effect of this endotherm is obtained by utilizing the fact that the endothermic amount of the liquid varies depending on the flow rate of the liquid. It is detected by the change of the electrical characteristic value due to the temperature change of the temperature sensor, for example, the resistance value.
- the indirectly heated flow meter used in the leak detection device described in Patent Document 1 is capable of dealing with a change in flow rate in a very small region where the flow rate value is, for example, 1 milliliter Zh or less. Since the change in the electric circuit output is small, the error in the flow rate measurement value tends to increase. For this reason, there has been a limit to improving the accuracy of leak detection.
- the fluid is heated by a heat source arranged at a specific position of the pipe
- temperature sensors are arranged at appropriate distances on the upstream side and downstream side of the heat source position, respectively, and the upstream temperature sensor and the downstream temperature sensor generated when the fluid in the pipe flows.
- There is a two-point temperature difference detection type that measures the fluid flow rate based on the detected temperature difference.
- this sensor is used for leak detection as described above, the change in the output of the electric circuit with respect to the change in the flow rate becomes small when the flow rate value is, for example, 3 ml Zh or more.
- the error becomes large (that is, the ratio of the flow rate difference that can be discriminated at the time of measurement increases and the sensitivity decreases).
- Patent Document 1 Japanese Patent Application Laid-Open No. 2003-185522
- an object of the present invention is to detect a leak in a liquid in a tank capable of detecting a leak with good accuracy and sensitivity over a wide range of leak amount from a very small amount of leak to a relatively large amount of leak. Is to provide.
- a device for detecting leakage of liquid in a tank A device for detecting leakage of liquid in a tank
- a measuring tube connected to an upper end of the measuring thin tube and having a cross-sectional area larger than that of the measuring thin tube; a first temperature sensor attached to the measuring thin tube and sequentially disposed along the measuring thin tube; an indirectly heated sensor; and A flow rate sensor unit for measuring the flow rate of the liquid in the measuring capillary, the second thermal sensor comprising a heater and a third temperature sensor;
- a pressure sensor for measuring the liquid level of the liquid
- a leakage detection control unit connected to the flow rate sensor unit and the pressure sensor, the leakage detection control unit including a voltage generation circuit for applying a voltage to the heater, the first temperature sensor, and the second temperature sensor.
- a first leakage detection circuit connected to the temperature sensors and producing an output corresponding to the temperature difference sensed by the temperature sensors; and connected to the indirectly heated sensor and sensed by the third temperature sensor Produces an output corresponding to the temperature.
- a second leak detection circuit for detecting leakage of the liquid in the tank based on a flow rate corresponding value corresponding to the flow rate of the liquid calculated using the output of the first leak detection circuit.
- the first to third leak detection among the detection results at least one of the predetermined first to third predetermined ranges is output.
- the leak detection control unit includes the second leak among the detection results of the first to third leak detections within the first to third predetermined ranges, respectively. Only one detection result is output in the order of the detection result of the detection, the detection result of the first leak detection, and the detection result of the third leak detection.
- the leak detection control unit for a predetermined time, when the detection result of the second leak detection exceeds the upper limit of the second predetermined range, for the predetermined time. Stop leak detection.
- the leak detection control unit may perform the predetermined time, the voltage generation circuit and the first when the detection result of the second leak detection exceeds the upper limit of the second predetermined range. And stop the operation of the second leak detection circuit.
- the voltage generation circuit is a constant voltage generation circuit that applies a constant voltage to the heater.
- the measurement tube can be attached to and detached from the leak detection device.
- the pressure sensor is disposed in the vicinity of the lower end of the measurement capillary.
- a circuit housing portion is attached to an upper portion of the measurement tube, and the leak detection control portion is disposed in the circuit housing portion.
- the flow rate sensor section includes a first temperature sensor, an indirectly heated sensor, and a second temperature sensor, and the indirectly heated sensor includes a heater and a third temperature sensor. And a pressure sensor for measuring the liquid level, a voltage generation circuit for applying a voltage to the heater to the flow rate sensor unit and a leak detection control unit connected to the pressure sensor, and the first sensor. A first leak detection circuit that generates an output using a temperature sensor and a second temperature sensor; and a second leak detection circuit that generates an output using a third temperature sensor of the indirectly heated sensor. Yes.
- the first leakage detection by the first leakage detection circuit, the second leakage detection by the pressure sensor, and the third leakage detection by the second leakage detection circuit are performed, and the first to third At least one of the detection results of the first to third predetermined ranges is output from the respective detection results of the leak detection.
- FIG. 1 is a partially cutaway perspective view for explaining an embodiment of a tank liquid leak detection device according to the present invention.
- FIG. 2 is a partially omitted cross-sectional view of the leak detection device of the embodiment of FIG.
- FIG. 3 is a partially omitted front view of the leak detection device of the embodiment of FIG.
- FIG. 4 is an enlarged perspective view of a mounting portion of the first temperature sensor, the indirectly heated sensor, and the second temperature sensor with respect to the measurement thin tube.
- FIG. 5 is a cross-sectional view of FIG.
- FIG. 6 is a cross-sectional view of FIG.
- FIG. 7 is a block diagram showing a flow rate measurement system of the leak detection apparatus of FIG.
- FIG. 8 is a diagram showing a circuit configuration of a flow rate sensor unit, a pressure sensor, and a leak detection control unit.
- FIG. 9 Sensor output for liquid level change rate in leak detection based on two-point temperature difference detection type flow rate measurement, leak detection based on constant heat generation control temperature detection type flow rate measurement, and leak detection based on the liquid level time change rate inspection type It is a figure which shows the example (calibration curve).
- FIG. 1 is a view for explaining an embodiment of a leak detection device for liquid in a tank according to the present invention.
- FIG. 2 is a partially broken perspective view, and FIG. 2 is a partially omitted cross-sectional view of the leak detection device of the present embodiment.
- the tank 1 includes a top plate 2 formed with a metering port 5 and a liquid injection port 6 used for injecting liquid into the tank, and when supplying liquid from the tank to the outside of the tank. It has a side plate 3 in which a liquid supply port 7 to be used is formed and a bottom plate 4. As shown in FIG. 1, a liquid (for example, gasoline, light oil or kerosene or other flammable liquid) L is contained in the tank 1.
- L S indicates the liquid level.
- the leak detection device 11 is partially inserted into the tank 1 through the measuring port 5 formed in the top plate 2 of the tank 1, and is arranged in the vertical direction as a whole.
- the leak detection device 11 includes a liquid introduction / extraction section 12, a flow rate measurement section 13, a liquid reservoir section 14, a cap 16 and a circuit housing section 15.
- the liquid inlet / outlet part 12, the flow rate measuring part 13, and the liquid reservoir part 14 are located inside the tank 1, and the liquid level LS is located within the height range of the liquid reservoir part 14.
- the flow rate measuring unit 13 includes a sheath tube 171 extending in the vertical direction
- the liquid reservoir 14 is a sheath tube 17 extending in the vertical direction. It is composed including
- a sensor holder 13a is disposed in the sheath tube 171, and the vertical measuring thin tube 13b is fixedly held by the sensor holder.
- a first temperature sensor 133, an indirectly heated sensor 135, and a second temperature sensor 134 are attached to the measurement capillary 13b with the upper side force also arranged in this order.
- the indirectly heated sensor 135 is disposed at an equal distance from the first temperature sensor 133 and the second temperature sensor 134. Since the outer side of the sensor holder 13 a is covered with the sheath tube 171, the first temperature sensor 133, the indirectly heated sensor 135, and the second temperature sensor 134 are protected from corrosion by the liquid L.
- the measurement thin tube 13b functions as a liquid flow path between the liquid reservoir 14 and the liquid inlet / outlet 12. Further, the first temperature sensor 133, the indirectly heated sensor 135, and the second temperature sensor 134 constitute a flow rate sensor unit for measuring the flow rate of the liquid in the measurement capillary 13b.
- the flow rate measurement unit 13 is provided with a pressure sensor 137 attached to the sensor holder 13a in the vicinity of the lower end of the measurement thin tube 13b.
- This pressure sensor 137 is for measuring the liquid level of the liquid L in the tank.
- a piezoelectric element or a condenser type pressure detection element can be used, and an electrical signal corresponding to the liquid level, for example, Voltage signal Is output.
- the filter cover 12b fixes the filter 12a to the lower part of the sensor holder 13a.
- the filter 12a has a function of removing foreign matters such as sludge that floats or settles in the liquid in the tank and introduces only the liquid into the liquid reservoir 14 through the measurement thin tube 13b. Further, an opening is provided in the side wall of the filter cover 12b, and the liquid L in the tank 1 is introduced into the measurement capillary 13b through the filter 12a of the liquid introduction / extraction part 12.
- the liquid reservoir 14 is located above the flow rate measuring unit 13, has a space G surrounded by the sheath tube 17, and stores the liquid introduced from the measurement thin tube 13b in the space G. Is configured.
- a cap 16 is fixed to the upper portion of the sheath tube 17, and an air passage 16 a is formed in the cap for communicating the inside of the liquid reservoir portion 14 with the tank space outside the detection device.
- a circuit housing 15 is attached to the cap 16, and a leak detection control unit 15a is housed in the circuit housing.
- a guide tube Pg extending so as to connect the upper part of the sensor holder 13a and the cap 16 is disposed in the sheath tube 17, and the first temperature sensor 133, the indirectly heated sensor 135 of the flow rate measuring unit 13, and A wiring 18 that connects the second temperature sensor 134, the pressure sensor 137, and the leak detection control unit 15a extends through the guide tube Pg.
- the sheath tube 17 in the liquid reservoir 14 constitutes the measurement tube of the present invention.
- the cross-sectional area of the measuring capillary 13b should be set sufficiently small (for example, 1Z50 or less, 1Z100 or less, or 1Z300 or less) relative to the cross-sectional area of the sheath tube 17 (excluding the cross-sectional area of the guide tube Pg).
- the cross-sectional area of the sheath tube 17 excluding the cross-sectional area of the guide tube Pg.
- the sheath tube 17 constituting the measurement tube can be attached to and detached from the leak detection device. That is, the lower end portion of the sheath tube 17 is detachably attached to the sensor holder 13a by screw connection or the like, and the upper end portion is formed to be detachable from the cap 16 by screw connection or the like. Therefore, as shown in FIG. 3B, a sheath tube 17 ′ having a different cross-sectional area in the tube can be attached instead of the sheath tube 17.
- the significance of making the measurement tube detachable from the leak detection device in this way is as follows. That is, there are tanks of various sizes. For this reason, the tanks of various sizes When using a leak detection device that uses a measuring tube with a constant cross-sectional area in the tube, even if the amount of liquid leaking from the tank is the same, the horizontal cross-sectional area of the tank varies depending on the size of the tank. The flow rate value detected by each unit is different. In other words, even if the flow rate value detected by the flow rate sensor unit is the same, the tank horizontal cross-sectional area differs depending on the size of the tank, and therefore the amount of liquid that leaks also differs.
- the measuring tube can be attached and detached, and a measuring tube with an appropriate cross-sectional area in the tube can be attached according to the size of the tank. If the amount is equal, the flow rate value detected by the flow rate sensor can be made equal.
- the measurement thin tube 13b, the sheath tube 17, 171, the sensor holder 13a, the filter cover 12b, the cap 16 and the guide tube Pg are preferably made of a metal having a thermal expansion coefficient approximate to the material constituting the tank 1. More preferably, it has the same metal strength as the material of tank 1 such as pig iron or stainless steel.
- Fig. 4 is an enlarged perspective view of a mounting portion of the first temperature sensor 133, the indirectly heated sensor 135, and the second temperature sensor 134 with respect to the measurement capillary, and Figs. 5 and 6 are sectional views thereof. is there .
- the first temperature sensor 135 includes a heat transfer member 181 disposed in contact with the outer surface of the measurement thin tube 13b, and the heat transfer member 181 mounted via an electrically insulating thin film.
- the thin film temperature sensing element 182 is formed in a required pattern, and a wiring 182 ′ is connected to an electrode for energizing the thin film temperature sensing element 182.
- the heat transfer member 181 is, for example, a metal or alloy cable having a thickness of about 0.2 mm and a width of about 2 mm.
- the wiring 182 ′ is connected to wiring (not shown) formed on the wiring board 24 such as a flexible wiring board. This wire is connected to the wire 18 in the guide tube Pg.
- the heat transfer member 181, the thin film temperature sensing element 182, and the wiring 182 ′ are sealed together with a part of the wiring substrate 24 and a part of the measuring capillary 13 b by a sealing member 23 made of a synthetic resin.
- the second temperature sensor 134 is the same as the first temperature sensor 133.
- the indirectly heated sensor 135 is in contact with the outer surface of the measuring capillary 13b.
- the heat transfer member 161 disposed, the thin film temperature sensor 162 laminated on the heat transfer member 161 via an electrically insulating thin film, and the thin film temperature sensitive body 162 laminated on the thin film temperature sensitive body 162 via an electrically insulating thin film 164 A thin film heating element 163.
- the thin film temperature sensing element 162 and the thin film heating element 163 are each formed in a required pattern, and wirings 162 ′ and 163 ′ are connected to electrodes for energizing them.
- the heat transfer member 161 is made of, for example, a metal or alloy having a thickness of about 0.2 mm and a width of about 2 mm.
- the wirings 162, 163 are connected to wirings (not shown) formed on the wiring board 24 such as a flexible wiring board. This wire is connected to the wire 18 in the guide tube Pg.
- the heat transfer member 161, the thin film temperature sensing element 162, the electrically insulating thin film 164, the thin film heating element 163, and the wirings 162 ′ and 163 ′ are sealed with a synthetic resin together with a part of the wiring board 24 and a part of the measuring capillary 14. Sealed by a stop member 22.
- the first detection circuit 30 of FIG. 7 is configured including the thin film temperature sensing element 162, the thin film heating element 163, and wirings 162 ′ and 163 ′ to them.
- the second detection circuit 32 of FIG. 7 is configured including the thin film temperature sensor 182 of the first temperature sensor 133 and the second temperature sensor 134.
- the first detection circuit 30 outputs an output Vh corresponding to the flow rate value of the indirectly heated constant heating control temperature detection type flow rate measurement (hereinafter referred to as “flow rate value output” or “flow rate corresponding output”), and the second output. From the detection circuit 32, an output corresponding to the flow rate value of the two-point temperature difference detection type flow rate measurement (hereinafter simply referred to as “flow rate value output”) Vout is output.
- These flow rate value outputs are input to the calculation unit 34 (CPU 68 described later) shown in FIG.
- the liquid level LS of the liquid L in the tank is positioned within the height range of the liquid reservoir 14 as described above. Therefore, the pressure sensor 137 is immersed in the liquid L in the tank filtered by the filter 12a of the liquid introduction / extraction part 12, and the liquid L in the tank rises through the measurement thin tube 13b of the flow rate measurement part 13 and becomes liquid The liquid is introduced into the space G of the reservoir 14 and finally the liquid level in the liquid reservoir 14 becomes the same height as the liquid level LS of the liquid in the tank outside the leak detector.
- the liquid level LS of the liquid in the tank changes, the liquid level of the liquid in the liquid reservoir 14 also fluctuates, and the liquid level in the measuring capillary 13b changes with this liquid level change, that is, the liquid level change. Flow occurs.
- FIG. 8 is a diagram showing a circuit configuration of the flow rate sensor unit, the pressure sensor, and the leak detection control unit.
- a battery (not shown) disposed in the circuit housing portion 15 is used. Can be used.
- the thin film heating element 163 of the indirectly heated sensor 135 is connected to the voltage generation circuit 67.
- a constant voltage generation circuit is used as the voltage generation circuit 67.
- a constant voltage is applied to the thin film heating element 163 from the constant voltage generation circuit.
- the thin film temperature detectors 60 and 61 constituting the first and second temperature sensors 133 and 134 are connected to a leak detection circuit 71. That is, the thin film temperature sensors 60 and 61 (same as 182 described above) together with the resistors 62 and 63 form a bridge circuit.
- a power supply voltage VI is supplied to the bridge circuit, and a voltage output signal corresponding to the potential difference between the points a and b is obtained by the differential amplifier 65.
- the output of the first leak detection circuit 71 corresponds to the temperature difference detected by the thin film temperature detectors 60 and 61 of the temperature sensors 133 and 134, and is input to the CPU 68 via the AZD converter 66. As a result, the two-point temperature difference detection type flow rate measurement and the leak detection based on this are performed.
- the output of the second leak detection circuit consisting of the thin film temperature sensor 162 of the indirectly heated sensor 1 35 and the grounding resistor 63 'corresponds to the temperature sensed by the thin film temperature sensor 162, and is an AZD converter. Input to CPU68 via 66 '. As a result, the side heat constant heat generation control temperature detection type flow rate measurement and leakage detection based on this are performed.
- the constant voltage generation circuit 67 is controlled in operation by a command from the CPU 68.
- the output of the pressure sensor 137 is input to the CPU 68 via the AZD converter 73. Thereby, the leak detection of the liquid level time change rate inspection type is performed.
- a clock 69 and a memory 70 are connected to the CPU 68.
- a constant DC voltage that is, a constant DC voltage
- Q is applied to the thin film heating element 163 of the indirectly heated sensor 135 from the constant voltage generating circuit used as the voltage generating circuit 67 of FIG. Is applied.
- the thin-film heating element 163 maintains a constant heat generation state, and part of the heat is transferred to the liquid in the measuring capillary 13b via the heat transfer member 161, which is used as a heat source for heating the liquid. Is done.
- the first and second The detected temperatures of the temperature sensors 133 and 134 are substantially the same.
- the influence of liquid heating by the indirectly heated sensor 135 occurs more strongly on the downstream side than on the upstream side. Therefore, the first and second temperature sensors 133 and 134 Different detection temperatures It becomes like this. Since the voltage output corresponding to the difference between the detected temperatures of the first and second temperature sensors 133 and 134 corresponds to the fluid flow rate, it is used as the flow rate value output.
- the potentials at points a and b of the bridge circuit of the leak detection circuit 71 are input to the differential amplifier circuit 65.
- the voltage output S corresponding to the difference between the detected temperatures of the first and second temperature sensors 133 and 134 from the differential amplifier circuit is obtained.
- the CPU 68 performs conversion to the corresponding flow rate value using the built-in calibration curve based on the voltage output S.
- the two-point temperature difference detection type flow rate measurement and the leak detection based thereon are performed.
- the two-point temperature difference detection type flow rate measurement is a temperature difference detected by the first and second temperature sensors respectively arranged on the upstream side and the downstream side of the heater (actually corresponding to the detected temperature difference). The value corresponding to the flow rate is obtained based on the difference in electrical characteristics detected.
- the CPU 68 performs conversion into a corresponding flow rate value using a built-in calibration curve based on the output obtained from the indirectly heated sensor 135. As a result, the constant heat generation control temperature detection type flow rate measurement and the leak detection based on this are performed.
- the CPU 68 can immediately convert the liquid level corresponding output P input from the pressure sensor 137 via the AZD converter 73 into the liquid level P.
- the value of the liquid level p is based on the height of the pressure sensor 137.
- the height of the metering port 5 of the tank 1 and the partial force of the leak detector attached to the metering port The distance to the pressure sensor 137 can be converted into a liquid level value for the tank itself.
- a liquid level detection signal indicating the result of the liquid level detection is output from the CPU 68.
- the CPU 68 stores the value of the liquid level p in the memory 70 every certain period of time, for example, every 2 to 10 seconds, and calculates the difference from the previous stored value every time this storage is performed. Is stored in the memory 70 as the value of the time change rate P ′. Therefore, the liquid leakage in the tank can be obtained as the magnitude of the time change rate P ′ of the liquid level p measured by the pressure sensor 137. As a result, the leak detection is performed using the liquid level time change rate inspection method.
- FIG. 9 shows leak detection based on the above two-point temperature difference detection type flow rate measurement, leak detection based on the constant heat generation control temperature detection type flow rate measurement, and leak detection based on the liquid level time change rate inspection type. It shows an example (calibration curve) of sensor output with respect to the liquid level change rate. This is for the case where the inner diameter of the measuring tube is 32 mm.
- the absolute value of the liquid level change rate is less than 0.01 [mm / h]
- the absolute value of the liquid level change rate is 0.01 to 15 [mm / h]
- the leak detection result based on the flow rate detection is output.
- an absolute value of 0.01 to 2 [mmZh] is set as the predetermined range (first predetermined range) for leak detection (first leak detection) based on the above two-point temperature difference detection type flow rate measurement.
- the absolute value 10 ⁇ : L00 [mmZh] should be set as the predetermined range (second predetermined range) for the leak detection (second leak detection) of the above-mentioned liquid level time rate change inspection method
- the absolute value l to 20 [mmZh] should be set as the predetermined range (third predetermined range) for leak detection (third leak detection) based on the above constant heat generation control temperature detection type flow rate measurement Can do. These are good detection sensitivity ranges for each method.
- the CPU 68 when there are a plurality of detection results of the first to third leak detections within the first to third predetermined ranges, respectively, the detection result of the second leak detection, Only one detection result can be output in the order of the detection result of the first leak detection and the detection result of the third leak detection.
- the liquid level change in the tank 1 also occurs when liquid is injected from the liquid injection port 6 into the tank or when liquid is supplied from the liquid supply port 7 to the outside.
- the rate of rise or fall of the liquid level in the tank 1 in these cases is generally much larger than the rate of liquid level change or the rate of change of the liquid level in the case of a leak.
- the CPU 68 performs the following processing regarding leakage.
- the result of the first leak detection is When the value is within a predetermined range (for example, absolute value 0.01-2 [mmZh]), the result of the first leak detection is output as a leak detection signal, and the result of the first leak detection exceeds the upper limit of the predetermined range. When it is large (for example, larger than absolute value 2 [mmZh]), the result of the third leak detection is leak detection. When the first leak detection result is smaller than the lower limit of the above specified range (eg smaller than absolute value 0.01 [mmZh]), it is determined that there is no leak and no leak detection signal is output.
- a predetermined range for example, absolute value 0.01-2 [mmZh]
- the CPU 68 can stop the first leak detection and the third leak detection during the subsequent predetermined time. It is preferable that the predetermined time for stopping the leak detection is slightly longer than the settling time of the liquid level LS after liquid injection into the external force tank or liquid supply from the tank to the outside. It can be 10-60 minutes. In particular, during this predetermined time, the CPU 68 can stop the operation of the voltage generation circuit 67, the first leak detection circuit 71, and the second leak detection circuit. According to this, power consumption is reduced.
- the liquid level change rate or the liquid level time change rate is related to the amount of leakage (the amount of leakage per unit time). That is, the liquid level change rate or the liquid level time change rate multiplied by the horizontal sectional area inside the tank at the liquid level corresponds to the amount of liquid leakage. Accordingly, the shape of the tank (that is, the relationship between the height position and the horizontal cross-sectional area inside the tank) is stored in the memory 70 in advance, and the detection is performed as described above with reference to the stored content of this memory. Based on the liquid level and leakage (liquid level change rate or liquid level time change rate), the amount of liquid leakage in the tank can be calculated.
- the liquid level change rate or the liquid level are in a simple proportional relationship, so the rate of change of the level of liquid or the rate of change of level with time is multiplied by a proportional constant according to the horizontal cross-sectional area inside the tank regardless of the value of the level.
- the leakage detected by the above-described apparatus of the present invention is substantially the same as that based on the leakage amount.
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Abstract
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/791,685 US7574897B2 (en) | 2004-11-29 | 2005-11-21 | Device for detecting leakage of liquid in tank |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004344109A JP2006153635A (ja) | 2004-11-29 | 2004-11-29 | タンク内液体の漏れ検知装置 |
| JP2004-344109 | 2004-11-29 |
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| WO2006057219A1 true WO2006057219A1 (ja) | 2006-06-01 |
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| PCT/JP2005/021364 Ceased WO2006057219A1 (ja) | 2004-11-29 | 2005-11-21 | タンク内液体の漏れ検知装置 |
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| US (1) | US7574897B2 (ja) |
| JP (1) | JP2006153635A (ja) |
| WO (1) | WO2006057219A1 (ja) |
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Also Published As
| Publication number | Publication date |
|---|---|
| US7574897B2 (en) | 2009-08-18 |
| US20080121022A1 (en) | 2008-05-29 |
| JP2006153635A (ja) | 2006-06-15 |
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