WO2006003783A1 - 液体貯蔵タンクの漏洩検査装置 - Google Patents
液体貯蔵タンクの漏洩検査装置 Download PDFInfo
- Publication number
- WO2006003783A1 WO2006003783A1 PCT/JP2005/010787 JP2005010787W WO2006003783A1 WO 2006003783 A1 WO2006003783 A1 WO 2006003783A1 JP 2005010787 W JP2005010787 W JP 2005010787W WO 2006003783 A1 WO2006003783 A1 WO 2006003783A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- storage tank
- liquid storage
- liquid
- magnet
- tank
- Prior art date
Links
Classifications
-
- 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
- G01M3/3245—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 level monitoring device
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—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 pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2892—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 pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for underground fuel dispensing systems
Definitions
- the present invention relates to a leakage inspection apparatus for inspecting leakage of a liquid storage tank such as gasoline.
- the pressurization method includes a gas pressurization method and a liquid pressurization method, both of which enclose a test gas or liquid inside a tank to be inspected, pressurize the tank inside to a specified pressure, and leave it at rest. After that, the determination is made based on whether or not the pressure drop value maintains the value within the standard.
- the gas pressurization method uses nitrogen gas (N 2), and the liquid pressurization method mainly uses water.
- the fine pressurization method includes filling a nitrogen gas inside the tank, pressurizing the tank until it reaches a specified pressure, and allowing it to stand, and then the pressure drop value is a reference value. It is judged whether or not it has the power to maintain the inside. In this case, in order to inspect only the inner wall of the gas phase in the tank, the pressure is lower and higher than that of the pressurization method.
- the gas phase inside the tank is depressurized and it is determined whether the pressure increase value maintains the standard. In this case as well, the depressurization is performed in the gas phase.
- the inspection object is only the inner wall of the gas phase.
- Patent Document 1 JP-A-10-19717
- Patent Document 2 US Patent No. 5319956
- the pressurization method uses a medium such as gas or liquid to fill the tank for inspection, so when inspecting the existing storage tank, The entire stored product is discharged once, and after the inspection is completed, the inside of the tank is cleaned and the original stored product is returned again, which is not efficient.
- the inspection time can be many hours, making it impossible to make a quick decision.
- Patent Document 2 a method has been proposed in which the inside of a tank is depressurized to a pressure close to a vacuum, and groundwater entering the tank is detected.
- This detection method detects the leak hole by measuring the water level at the bottom of the tank with groundwater that has entered due to pressure reduction, and detects the intrusion of air from the leak hole into the tank by the intrusion sound of bubbles.
- this detection method is used to detect leakage of the liquid phase in the tank, and if there is no groundwater under the liquid in the tank, if there is little groundwater, Intrusion could not be detected or the detection accuracy was low. Furthermore, the intrusion sound of bubbles was weak, and the intrusion of air from minute leak holes could not be accurately detected.
- the present invention has been made in view of the above-described problems of the prior art, and provides a liquid storage tank leak detection device capable of easily and accurately performing tank leak inspection even while liquid is being stored in the liquid storage tank.
- the purpose is to provide.
- a liquid storage tank such as gasoline or light oil
- a decompression device that decompresses the inside of the liquid storage tank, and the liquid storage tank A rod portion to be inserted, a float that fits on the rod portion and floats on the liquid surface in the liquid storage tank and moves along the rod portion according to the displacement of the liquid surface, and a movable magnet provided on the float A reference magnet fixed to the rod portion and positioned in the liquid storage tank, a displacement sensor for detecting the positions of the movable magnet and the reference magnet, respectively, and the movable relative to the reference magnet by a signal from the displacement sensor
- This is a liquid storage tank leak inspection device that consists of a measuring device that determines the position of the magnet.
- the displacement sensor includes a position of the reference magnet and a movable magnet provided in the float. It is a magnetostrictive linear sensor that detects the displacement of the.
- the reference magnet may be fixed to a lower portion of the rod portion and positioned in the liquid of the liquid storage tank.
- the measuring device includes a determination unit such as a program for determining whether or not the displacement of the movable magnet with respect to the reference magnet is greater than a certain value.
- the liquid storage tank is immersed in water, and the leakage of the portion of the tank where the liquid is immersed is detected.
- the present invention provides an acceleration sensor that is attached to a fixed object connected to the liquid in the liquid storage tank and detects acceleration of vibration, and whether or not a change in the signal of the acceleration sensor force is a certain level or more.
- a liquid storage tank leakage inspection device including a discrimination device for discriminating between a liquid storage tank and a liquid storage tank.
- the detected acceleration is the acceleration of the acoustic vibration generated when air leaks from the tank leaks into the tank, rises as bubbles in the liquid in the tank, and bursts at the liquid level.
- the acceleration sensor is integrally provided with a magnet part for attachment, and the magnet part is attached by applying grease to the fixed object to be attached. The invention's effect
- the leakage inspection apparatus of the present invention regardless of the amount of liquid in the liquid storage tank, the leakage inspection of the gas phase portion and the liquid phase portion of the tank portion in contact with the groundwater is efficiently and accurately performed. It can be done in a short time. Furthermore, it is possible to eliminate the influence of external temperature changes, etc., and extremely accurate measurement is possible.
- FIG. 1 is a schematic longitudinal sectional view showing a state in which a leakage inspection apparatus according to an embodiment of the present invention is attached to a liquid storage tank.
- FIG. 2 is a front view showing a magnetostrictive linear sensor of a leakage inspection apparatus according to an embodiment of the present invention.
- FIG. 3 is a graph comparing the effect of temperature rise of the leakage inspection apparatus according to the embodiment of the present invention with a case where a reference magnet is not used.
- FIG. 4 is a schematic longitudinal sectional view showing a state in which an acceleration sensor of a leakage inspection apparatus according to another embodiment of the present invention is attached to a liquid storage tank.
- the liquid storage tank 2 in this embodiment is fixed to an installation space 1 formed underground, and is used for a gas station or the like.
- the ground part 3 where the tank 2 is installed is paved with concrete 4 or the like, and the tank 2 is fixed by the fixing device 6 provided between the concrete 4 and the ground of the installation space 1. It is firmly fixed.
- a manhole part 8 is provided in the ground part 3 located above the tank 2, and a measuring pipe 10 for detecting the amount of liquid stored in the tank 2 and gasoline, etc.
- a suction pipe 16 to which a suction pump 14 for sucking the stored material 12 is connected is provided.
- the measuring pipe 10 is inserted from the upper part in the tank 2.
- the suction pipe 16 inserted from the manhole part 8 is inserted in the tank 2 with its tip part close to the inner bottom part.
- a vent pipe 18 is provided for communicating the gas phase space inside the tank 2 with the outside, and the above-ground portion of the vent pipe 18 is located along the fire wall 20.
- the leakage inspection apparatus performs a leakage inspection of the gas phase portion and the liquid layer portion of the tank 2 in a state where the liquid is stored, and a displacement sensor that detects the displacement of the liquid level for the detection of leakage.
- the magnetostrictive linear sensor 22 is used.
- the magnetostrictive linear sensor 22 includes a rod portion 24 that is passed through the measuring tube 10 and immersed in the liquid, and is fitted to the rod portion 24 and floats on the liquid surface in the tank 2 according to the displacement of the liquid surface. It has a float 25 that moves freely along 24.
- the float 25 is provided with a movable magnet 21, and a reference magnet 23 fixed to the rod portion 24 is provided at the lower end portion of the rod portion 24 and in the liquid of the storage 12 in the tank 2.
- a main body probe section 27 is provided at the upper end of the rod section 24, and a cable 29 for detection signals and electric power extends from the main body probe section 27.
- the cable 29 calculates and measures the displacement of the liquid level.
- a measuring device 26 such as a computer equipped with a program for determining the presence or absence of leakage.
- a T-type connection pipe 28 having a pressure reducing connection port and a pressure monitoring connection port is connected to an end portion of the aerial pipe 18 serving as a pressure reducing conduit.
- a decompression device 32 such as an explosion-proof decompression pump or an ejector is connected to the connection port for decompression of the T-type connection pipe 28 via a connection conduit 30 of the decompression device.
- a pressure gauge 34 with a minimum scale of lkPa at ⁇ 50kPa (FS) is connected.
- the pressure inside the tank 2 is further lowered by the pressure reducing device 32 below the water head pressure corresponding to the difference between the remaining amount of the storage 12 and the liquid level of the surrounding groundwater 42.
- the gas phase part 36 of the tank 2 is depressurized so that the pressure is reached.
- the set pressure reduction value takes into account the water level of the groundwater 42, and the groundwater level high head pressure is also reduced by the liquid head pressure of the stored item 12. Furthermore, the difference in specific gravity between water and oil becomes a problem, but oil has a specific gravity of 1.0 or less, and even if it is approximately equal to water, it works on the safe side of the set decompression value. Water head pressure is not considered Let's say.
- the reduced pressure value is determined by, for example, the following calculation formula.
- Depressurization value P is, for example, 5 kPa
- P is the pressure reduction setting (unit: kPa)
- A is the liquid level in the tank (unit: mm)
- B is the ground water level (unit: mm).
- the decompression value in tank 2 should not exceed 20 kPa.
- the detection principle of the magnetostrictive linear sensor 22 which is a displacement sensor used in this embodiment will be described.
- a current pulse is applied to the magnetostrictive wire that is the rod portion 24
- a circumferential magnetic field is generated in the entire axial direction of the magnetostrictive wire, and when the magnet is brought close to the magnetostrictive wire, an axial magnetic field is applied only to that portion.
- An oblique magnetic field is generated by the combination of the axial magnetic field and the circumferential magnetic field, and a torsional strain is generated only in the rod portion 24 of this portion.
- This torsion phenomenon is mechanical vibration.
- This propagation time is measured, and the absolute position of the float 25 with the movable magnet 21 is measured.
- the position of the reference magnet 23 fixed to the rod part 24 is also measured.
- the leak detection of the tank 2 of this embodiment if a minute leak hole exists in the tank 2, the surrounding ground water also enters the leak hole due to the pressure reduction, and the liquid level of the stored item 12 rises. It is to detect this.
- the amount of groundwater that enters depends on the size of the leak hole, the pressure in the leak hole, and the size of the tank 2 liquid surface. In particular, the size of the liquid level in tank 2 varies greatly depending on the size and level of the tank. Therefore, in order to simplify the judgment, the minimum value for safety is set as a threshold for judging the presence or absence of leakage.
- the magnetostrictive linear sensor 22 has a resolution of 0.005 mm and the ability to detect a slight liquid level displacement. Expansion is a problem. In particular, when measuring in an environment where the main body probe unit 27 is exposed to direct sunlight during measurement, thermal expansion of the rod unit 24 over the course of the measurement time becomes a problem. The In order to cancel the influence of this thermal expansion, the reference magnet 23 is provided in this embodiment.
- the main body probe part 27 and the adjacent rod part 24 are affected by the thermal expansion, and if the displacement due to heat is A tk, the origin O force of the main body probe part 27 is also the reference, as shown in Fig. 2.
- the measurement distance to the magnet 23 can be expressed as T1 + A tk, and the origin O force of the main body probe unit 27 can also be expressed as the measurement distance to the movable magnet 21 as T2 + A tk.
- the distance T1 is fixed.
- the presence or absence of leakage can be determined by the displacement of the movable magnet 21 with respect to the fixed reference magnet 23.
- FIG. 3 shows the influence of the output of the magnetostrictive linear sensor 22 according to this embodiment due to the external temperature, and the change due to the external temperature of the output when the reference magnet 23 is not provided.
- the main body probe portion 27 of the magnetostrictive linear sensor 22 was placed in a thermostatic bath, and the relationship between the bath temperature and the output was plotted on a graph.
- the leakage inspection apparatus of this embodiment for example, even in the case of leakage inspection of the tank 2, even if expansion occurs in the main body probe portion 27 due to an external temperature, a slight change in liquid level is accurately detected and leakage occurs. Can be detected.
- the reference magnet 23 in the vicinity of the lower end of the rod portion 24 and positioning it in the liquid, it can be set as the reference position without being affected by the external temperature.
- the leakage inspection apparatus also performs a leakage inspection of the liquid layer portion of the tank 2 in a state where the liquid is stored, and uses the acceleration sensor 44 to detect leakage.
- the acceleration sensor 44 has a magnet portion on the lower surface, and is fixed to a flat surface as much as possible at the upper end of the bent portion of the suction tube 16 located inside the manhole portion 8. Apply grease to the fixed position to attract the magnet part of the acceleration sensor 44.
- the output of the acceleration sensor 44 is output to a determination device 46 such as a computer via the amplifier 44.
- the acceleration sensor 44 detects, for example, a distortion caused by a piezoelectric element or a change in capacitance.
- the acceleration sensor 44 detects acceleration of vibration in a three-dimensional direction, converts it into an electric signal, and outputs it.
- the gas phase portion 36 of the tank 2 is depressurized by the depressurizer 32 so that the pressure is lower than the water head pressure due to the remaining amount of the stored matter 12 in the tank 2.
- the depressurizer 32 When a leak hole exists in the inner wall 40 of the liquid phase part 38 of the tank 2, air enters the tank 2 from the leak hole, and rises as bubbles in the liquid of the stored item 12 in the tank 2. .
- the bubbles reach the liquid level of the stored product 12, they burst at the liquid level, thereby generating an acoustic vibration. This vibration propagates through the suction pipe 16 inserted in the liquid phase portion 38 of the tank 2, and the acceleration of the vibration is detected by the acceleration sensor 44.
- a signal from the acceleration sensor 44 is sent to a discrimination device 46 such as a computer through the amplifier 44, and the signal is identified. Then, the presence or absence of leakage is inspected based on whether or not the output of the acceleration sensor 44 after decompression shows a high value above a certain level within a predetermined time of about several minutes.
- the judgment level is that if there is a sound of bursting of bubbles! /, There is a leak. Therefore, if a signal higher than the signal level before decompression, for example, 6db or more occurs, there is a leak, and the signal level lower than that. If it is, it is determined that there is no leakage.
- This vibrational motion is represented by a cosine or sine of a trigonometric function, and performs a periodic motion.
- cosine if the distance from the balance point is X,
- ⁇ is an angular frequency
- ⁇ 2 ⁇
- a amplitude
- t time. Therefore, the motion repeats the same cycle every 2 ⁇ / ⁇ .
- This motion has a speed and an acceleration, and the speed is changed as shown in the following equations (5) and (6).
- the equation (4) of the unit quantity x is differentiated once, and the acceleration is calculated by differentiating the above equation (4) twice.
- the vibration speed increases in proportion to the frequency.
- the vibration acceleration increases in proportion to the square of the frequency. From this, it can be said that when the frequency is high to some extent, it is better to detect the vibration acceleration to detect the micro-vibration generated by the minute bubble force.
- a minute leakage hole of ⁇ 0.3 mm or less exists in the inner wall 40 of the liquid phase part 38.
- this acceleration sensor can be used to detect leakage in the liquid phase section, not only the presence or absence of groundwater around the liquid storage tank. it can.
- the liquid type of the stored product in the liquid storage tank can be applied to liquids having a kinematic viscosity of less than 150 mm 2 Zs, such as gasoline, alcohols, solvents, kerosene, light oil, and heavy oil. It is a thing.
- the reference magnet may be located at a position other than the lower end of the rod part as long as it is not affected by the external temperature in the liquid storage tank.
- the leak inspection system using an accelerometer is used when there is no water around the outer wall of the tank, and when the groundwater level in the tank installation space is lower than the liquid level in the liquid phase of the underground tank. It can also be applied to tank inner wall leakage inspection between the surface and the groundwater surface. Furthermore, it can be applied to liquid tanks on the ground, and uses are not limited.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/571,414 US7603900B2 (en) | 2004-07-01 | 2005-06-13 | Leakage inspection apparatus for liquid storage tank technical field |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-195745 | 2004-07-01 | ||
JP2004195745A JP4589669B2 (ja) | 2004-07-01 | 2004-07-01 | 液体貯蔵タンクの漏洩検査方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006003783A1 true WO2006003783A1 (ja) | 2006-01-12 |
Family
ID=35782595
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/010787 WO2006003783A1 (ja) | 2004-07-01 | 2005-06-13 | 液体貯蔵タンクの漏洩検査装置 |
Country Status (4)
Country | Link |
---|---|
US (1) | US7603900B2 (ja) |
JP (1) | JP4589669B2 (ja) |
TW (1) | TWI364531B (ja) |
WO (1) | WO2006003783A1 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4542576B2 (ja) * | 2007-09-11 | 2010-09-15 | 昭和機器工業株式会社 | 液体貯蔵タンクの漏洩検査方法 |
US20130036588A1 (en) * | 2011-08-09 | 2013-02-14 | Agar Corporation Limited | Method and Apparatus for Installing a Device at a Storage Vessel |
JP5556849B2 (ja) * | 2012-05-22 | 2014-07-23 | トヨタ自動車株式会社 | 液没部燃料漏れ診断装置 |
CN103063373A (zh) * | 2012-12-28 | 2013-04-24 | 特变电工沈阳变压器集团有限公司 | 变压器储油柜用胶囊测漏仪 |
CN113049419A (zh) * | 2021-03-08 | 2021-06-29 | 中国人民解放军61699部队 | 一种防爆洗消一体化处置系统的性能测试方法 |
CN113049418A (zh) * | 2021-03-08 | 2021-06-29 | 中国人民解放军61699部队 | 防化防爆罐的抗破片侵彻和密封性能测试方法 |
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JPS6123917A (ja) * | 1984-07-12 | 1986-02-01 | Hitachi Ltd | 位置検出器 |
JPH0486537A (ja) * | 1990-07-30 | 1992-03-19 | Wabus Technol Bv | ケーシングの気密性の検査方法及び該方法を実施するための装置 |
JPH08327491A (ja) * | 1995-05-31 | 1996-12-13 | Nippon Denpa Kk | 地下タンクの漏洩検知装置 |
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-
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- 2005-06-13 WO PCT/JP2005/010787 patent/WO2006003783A1/ja active Application Filing
- 2005-06-13 US US11/571,414 patent/US7603900B2/en not_active Expired - Fee Related
- 2005-06-28 TW TW094121580A patent/TWI364531B/zh not_active IP Right Cessation
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Publication number | Priority date | Publication date | Assignee | Title |
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JPS6123917A (ja) * | 1984-07-12 | 1986-02-01 | Hitachi Ltd | 位置検出器 |
JPH0486537A (ja) * | 1990-07-30 | 1992-03-19 | Wabus Technol Bv | ケーシングの気密性の検査方法及び該方法を実施するための装置 |
JPH08327491A (ja) * | 1995-05-31 | 1996-12-13 | Nippon Denpa Kk | 地下タンクの漏洩検知装置 |
JPH1048026A (ja) * | 1996-08-07 | 1998-02-20 | Tokiko Yuki Kk | 液面測定装置 |
JP2002040041A (ja) * | 2000-07-27 | 2002-02-06 | Japan Storage Battery Co Ltd | 加速度センサーの取付方法 |
JP2003148954A (ja) * | 2001-11-15 | 2003-05-21 | Okumura Corp | 高低差測定装置および高低差測定方法 |
JP3100913U (ja) * | 2003-10-08 | 2004-06-03 | 有限会社エンバイロ・テック・インターナショナル | 液体貯蔵タンクの漏洩検出装置 |
Also Published As
Publication number | Publication date |
---|---|
TWI364531B (en) | 2012-05-21 |
JP4589669B2 (ja) | 2010-12-01 |
JP2006017583A (ja) | 2006-01-19 |
US7603900B2 (en) | 2009-10-20 |
US20070220969A1 (en) | 2007-09-27 |
TW200606411A (en) | 2006-02-16 |
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