JP2006240655A - Underground tank management system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an underground tank management system capable of totally and constantly monitoring abnormality of an underground tank from a remote site. <P>SOLUTION: The underground tank management system includes underground tank sensors 20 for sensing abnormality related to oil leakage from an underground tank body 30 and occurrence of an earthquake, a controller 10 for receiving signals sensed by the sensors 20 to generally determine the abnormality, a display 18 for displaying the determination results by the controller 10, and an anti-overflow valve 19 for unloading which is controlled to open/close by a controller 11. The system detects the oil leakage and the occurrence of the earthquake by the sensors 20, determines the abnormality by the controller 11 based on the signals received from the sensors 20, makes an indication on the display 18, and controls the valve 19 to open/close. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an underground tank management system capable of collectively managing underground tanks for storing fuel oil such as gasoline buried in the site of a gas station.

Generally, in a gasoline filling station, a plurality of underground tanks formed as cylindrical sealed containers are embedded, and fuel oil such as gasoline, light oil, kerosene, etc. is individually stored in these underground tanks and installed on the ground. Oil is supplied by a refueling device. By the way, when cracks occur in the underground tank and piping connected from this underground tank to the refueling device, there is a risk of a fire or the like due to highly flammable fuel oil, or the fuel oil flows out into the sewers, etc. There was a risk of environmental pollution. For example, the present applicant has proposed a liquid level detection device for a double tank provided with a transparent spiral tube having a lower end communicating with a liquid sealed in the space of the double tank and having an inverted conical shape on the upper end side. (For example, refer to Patent Document 1). Further, the present applicant has proposed a leaked oil detector using a floating body that sinks in oil and a floating body that floats on water (see, for example, Patent Document 2). Further, the applicant places a rotating indicator provided with a balance weight on the upper end side of the gas detector tube buried in the vicinity of the underground tank, and stretches a string made of a material that can be melted with oil attached with a tension weight in the gas detector tube. The wire is linked to the tension weight so as to invert the rotation indicator against the weight of the balance weight by cutting the string, and an electric signal of the reed switch that is turned on by the inversion of the rotation indicator is output to the notification device. The technique regarding the oil leak detection apparatus of an underground tank is proposed (for example, refer patent document 3).
Japanese Patent Application Publication No. Hei 4-22800 (pages 2 to 3, FIGS. 1 to 3). Japanese Patent No. 3485063 (pages 2 to 3, FIGS. 1 to 6). Japanese Patent No. 3074351 (pages 2 and 3, FIGS. 1 to 3).

  The conventional double tank liquid level detector, leak oil detector and underground tank leak detector are individually anomalies such as cracks in the underground tank, oil leaks in the manhole pit above the underground tank, or underground tank The fuel oil that leaks into the ground around the can was individually detected. However, in the past, the relationship between multiple events in the event of an oil spill can be verified in the system without checking the causal relationship and relying on the experience of the judge without judging the reliability of the oil spill. There were many. Moreover, in the case of visual judgment, the monitoring work becomes complicated, and the abnormality of the underground tank cannot be monitored continuously at a remote location such as in the office.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an underground tank management system for a gas station that can continuously monitor an abnormality of an underground tank at a remote location.

  In order to achieve the above object, in the invention described in claim 1, an underground tank detection sensor for detecting an abnormality related to oil leakage of the underground tank body and occurrence of an earthquake, and detection by the underground tank detection sensor And a control device that comprehensively determines the abnormality by receiving the received signal, a display that displays the determination result by the control device, and an overflow prevention valve for unloading that is controlled to open and close by the control device. It is characterized by that. To detect oil leaks and earthquakes with underground tank detection sensors, and to control the opening and closing of the overflow prevention valve by displaying on the display by judging the abnormality from the signal received from the underground tank detection sensors Anomalies in underground tanks can be monitored continuously at a remote location.

  In the invention according to claim 2, the underground tank detection sensors include an oil level gauge for detecting the oil level stored in the underground tank body, a temperature sensor for detecting the oil temperature, and a double shell structure. An underground tank liquid level detection sensor for detecting the liquid level of the liquid sealed in the underground tank main body, an underground tank oil leak sensor for detecting leakage of oil leaking into the ground near the underground tank main body, and the underground tank main body The present invention is characterized by having a leaked liquid detection sensor for detecting leaked liquid in the manhole pit and a seismic sensor for detecting occurrence of an earthquake. Underground tank detection sensors can comprehensively detect oil leaks and earthquakes based on various reasons.

  In the invention according to claim 3, when the control device receives an oil level upper limit signal from the oil level gauge or receives an earthquake occurrence signal from the seismic sensor, the unloading overflow A signal for closing the prevention valve is transmitted. In the normal unloading, not only can the oil overflow be prevented, but also the unloading can be stopped in the event of an earthquake to prevent danger.

  In the present invention, an underground tank detection sensor for detecting an abnormality related to oil leakage in the underground tank body and an earthquake occurrence, and a control for comprehensively judging the abnormality by receiving a signal detected by the underground tank detection sensor Equipment, an indicator that displays the judgment result by this control device, and an overflow prevention valve for unloading that is controlled by the control device, oil leaks and earthquakes are generated by the underground tank detection sensors. Detects the abnormality from the signals received from the underground tank detection sensors in the control device, displays them on the display and controls the opening and closing of the overflow prevention valve to monitor the abnormality of the underground tanks all over the place. can do.

  Hereinafter, the present invention will be specifically described with reference to an illustrated embodiment. 1 and 2 are diagrams for explaining an underground tank management system according to an embodiment of the present invention. FIG. 1 is a diagram for explaining the overall structure of an underground tank apparatus in a gas station. FIG. 2 is a diagram for explaining the structure of the underground tank management system. FIG.

  As shown in FIG. 1, an underground tank apparatus 1 has an underground tank body 30 for storing any liquid oil such as gasoline, light oil, kerosene, etc., underground in a site 2 of a gas station. Is provided with an oil supply device 31. The upper side of the underground tank body 30 is provided with manhole pits 32 and 32 in which the upper surface of the site 2 is made of concrete and manholes are formed on the concrete surface. The underground tank body 30 is provided with an oil supply pipe 33 whose lower end communicates with the inside. The upper end side of the oil supply pipe 33 is introduced into the manhole pit 32 at the upper part of the underground tank main body 30, and is further provided with an overflow prevention valve 19 to which an oil supply hose for oil unloaded from the tank truck on the ground is connected. It is communicated to. An underground tank oil leak sensor 14 for detecting oil leakage is provided in the ground near the underground tank body 30. Further, the underground tank body 30 is provided with an oil supply pipe 34 whose lower end side is communicated with the inside, and the upper end part side of the oil supply pipe 34 is communicated with a horizontal draw pipe 35 in the manhole pit 32. The other end side of the horizontal pipe 35 is introduced into a fuel pit 36 formed in the lower portion of the oil supply device 31, and further led to the upper portion to communicate with an oil supply mechanism such as a pump of the oil supply device 31.

  In the manhole pit 32 at the upper part of the underground tank body 30, an underground tank liquid level detection sensor 13 for detecting an abnormality in the liquid level of the underground tank body 30 composed of a double tank is disposed. Further, in the other manhole pit 32, an elongated stem 37 extends from the upper part to the vicinity of the bottom of the lower underground tank body 30, and the temperature sensor 12 for detecting the temperature of the oil liquid is provided in the stem 37, An oil level gauge 16 by a magnetostrictive type or the like for detecting the oil level of the underground tank body 30 is provided at the upper end portion. Furthermore, a leaked liquid detection sensor 15 is disposed in each of the manhole pits 32 and 32 and the fuel supply pit 36. In the vicinity of the overflow prevention valve 19, there is provided a vent pipe 38 having a lower end portion communicating with an upper space in the underground tank body 30 and an upper end portion opened to the upper space of the site 2. In an office or the like away from the underground tank body 30, a computer device constituting the underground tank management system 10 of the embodiment of the present invention that comprehensively manages abnormalities such as oil leaks due to cracks in the underground tank body 30 or occurrence of earthquakes. And the like, a seismic sensor 17 for detecting the shaking of the earthquake, and a display 18 for displaying a data processing result by the control device 20 are arranged. Detection signals from the oil level gauge 16, temperature sensor 12, underground tank liquid level detection sensor 13, underground tank oil leak sensor 14, leaked liquid detection sensor 15 and seismic sensor 17 are connected to be transmitted to the control device 11, A signal obtained as a result of data processing by the control device 11 is transmitted to the display 18 and displayed, and is transmitted to the overflow prevention valve 19 to control the opening and closing.

  As shown in the block diagram of FIG. 2, the underground tank management system 10 of the present invention uses a control device 11 to send signals from the underground tank detection sensors 20 that detect abnormalities and earthquakes related to the underground tank body 30. The control device 11 comprehensively determines the abnormality based on a predetermined procedure, displays the result on the display 18, and controls the opening / closing of the overflow prevention valve 19 so that the oil during unloading is controlled. It prevents liquid overflow and ensures safety in the event of an earthquake. The underground tank detection sensors 20 include the oil level gauge 16, temperature sensor 12, underground tank liquid level detection sensor 13, underground tank oil leak sensor 14, leaked liquid detection sensor 15, and seismic sensor 17.

  The underground tank liquid level detection sensor 13 is provided with a reserve tank communicating with the space above the double-shell underground tank body 30 in which a space is formed between the inner tank and the outer tank. A liquid is sealed in and a switch for detecting the liquid level is provided in the reserve tank. The control device 11 detects the liquid level in the reserve tank based on the ON / OFF signal of this switch, and considers the liquid level and oil temperature assumed from the signals detected by the oil level gauge 16 and the temperature sensor 12. The leakage judgment is performed based on an abnormality such as a crack in the underground tank body 30.

  The underground tank oil leak sensor 14 includes, for example, a swelling resistance change type leak sensor for detecting the presence of oil in a gas detection pipe embedded in the ground near the underground tank body 30. The control device 11 determines oil leakage by detecting a change in electrical resistance of the leakage sensor due to oil leakage.

  The leaked liquid detection sensor is, for example, one in which a swelling resistance change type leak sensor for detecting an oil film is arranged in a case in which liquid freely flows inside. The control device 11 determines the intrusion of water such as rainwater or the leaked oil into the manhole pit 32 by detecting the change in the electrical resistance of the leak sensor for the presence of the oil film.

  Further, when the oil level gauge 20 receives a signal that the oil level gauge 20 has reached a predetermined upper limit liquid level while unloading oil from the tank truck, the control device 11 transmits a signal for closing to the overflow prevention valve 19. By doing so, overflow is prevented. In addition, when the seismic sensor 17 receives a signal that an earthquake has been detected, the control device 11 transmits a signal for closing to the overflow prevention valve 19 to prevent danger due to the occurrence of the earthquake.

  In the underground tank management system 10 having the above-described configuration, the control device 11 determines the liquid level and oil temperature assumed from the signals detected by the oil level gauge 14 and the temperature sensor 12 from the signal of the underground tank liquid level detection sensor 13. By taking into consideration, the leakage determination based on the abnormality of the underground tank body 30 is performed, the oil leakage determination in the ground around the underground tank body 30 is performed from the signal of the underground tank oil leak sensor 14, and the signal of the leakage detection sensor Therefore, intrusion of water such as rain water into the manhole pit 32 or leakage oil is judged, and the results are displayed on the display 18 and further closed to the overflow prevention valve 19 from the signal of the oil level gauge 20. The overflow prevention valve 1 is prevented when an overflow is prevented by transmitting the signal of the seismic sensor 17 and an earthquake is detected from the signal of the seismic sensor 17. By sending a signal for closing the, so as to prevent the danger caused by the earthquake. Accordingly, it is possible to monitor the abnormality of the underground tank in an integrated manner at a remote location such as in the office without depending on the experience of the judge regarding the relationship between the plurality of events when oil leakage occurs.

  In the above embodiment, the oil level gauge 16, the temperature sensor 12, the underground tank liquid level detection sensor 13, the underground tank oil leak sensor 14, the leaked liquid detection sensor 15, and the seismic sensor 17 constituting the underground tank detection sensor 20 are as follows. This is an example, and a sensor having another configuration capable of performing similar detection can be used.

  It can be used for an underground tank management system of a gas station that can collectively manage an underground tank that stores fuel oil such as gasoline installed on the site of the gas station.

It is a figure explaining the whole structure of the underground tank apparatus of the gas station of this invention embodiment. It is a block diagram explaining the structure of the underground tank management system of this invention embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Underground tank apparatus 2 Site 10 Underground tank management system 11 Control apparatus 12 Temperature sensor 13 Underground tank liquid level detection sensor 14 Underground tank oil leak sensor 15 Leak liquid detection sensor 16 Oil level gauge 17 Seismic sensor 18 Indicator 19 Overflow prevention valve 20 control device 30 underground tank body 31 oil supply device 32 manhole pit 33 oil supply pipe 34 oil supply pipe 35 horizontal draw pipe 36 oil supply pit 37 stem 38 vent pipe

Claims (3)

An underground tank detection sensor that detects an abnormality related to oil leakage from the underground tank body and an earthquake occurrence, a control device that comprehensively determines the abnormality by receiving signals detected by the underground tank detection sensor, and this An underground tank management system comprising: a display for displaying a determination result by a control device; and an overflow prevention valve for unloading whose opening and closing is controlled by the control device. The underground tank detection sensors include an oil level gauge for detecting the oil level stored in the underground tank body, a temperature sensor for detecting oil temperature, and a liquid liquid sealed in the underground tank body having a double shell structure. Underground tank liquid level detection sensor for detecting the position, underground tank oil leak sensor for detecting leakage of oil leaking into the ground near the underground tank body, and leakage liquid for detecting leakage liquid in the manhole pit of the underground tank body The underground tank management system according to claim 1, further comprising a detection sensor and a seismic sensor for detecting occurrence of an earthquake. The control device transmits a signal for closing the overflow prevention valve when an oil level upper limit signal is received from the oil level gauge or when an earthquake occurrence signal is received from the seismic sensor. Item 2. An underground tank management system according to item 2.

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