WO2006005998A1 - Dispositif et procede de detection de changement de temperature, en particulier pour la detection d'une fuite de liquide cryogenique - Google Patents
Dispositif et procede de detection de changement de temperature, en particulier pour la detection d'une fuite de liquide cryogenique Download PDFInfo
- Publication number
- WO2006005998A1 WO2006005998A1 PCT/IB2005/001744 IB2005001744W WO2006005998A1 WO 2006005998 A1 WO2006005998 A1 WO 2006005998A1 IB 2005001744 W IB2005001744 W IB 2005001744W WO 2006005998 A1 WO2006005998 A1 WO 2006005998A1
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- WO
- WIPO (PCT)
- Prior art keywords
- detecting
- temperature change
- temperature
- pressure
- tube
- Prior art date
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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
- G01M3/002—Investigating fluid-tightness of structures by using thermal means
Definitions
- the present invention relates to a temperature change detection device comprising means arranged to determine a variation of a physical quantity under the effect of a temperature change, this means being connected to a detector for measuring said Physical size.
- the invention also relates to a use of the temperature change detection device, in particular temperature changes occurring during leakage of cryogenic liquids.
- Such a device is well known from EP 0 502 781 which describes a device for detecting leaks of cryogenic liquids in which the means designed to determine the variation of physical quantity under the effect of a temperature change is an optical fiber. This has the property of becoming opaque when it undergoes a temperature change (from hot to cold) due to leakage of a cryogenic liquid occurring in the vicinity of the latter.
- the optical fiber of the device described in patent EP 0 502 781 is connected to the detector for measuring the physical quantity, in this case it is a detector for varying the refractive index of the light emitted by the optical fiber when it becomes opaque.
- This detector requires the presence of lenses and optical devices for measuring refractive indices.
- This device also involves the presence of a light source which is generally a laser.
- Such a device has the disadvantage of being expensive and heavy to implement. Indeed, the optical fiber is expensive and fragile material, the light source includes an equally expensive laser and the detector is also a complex detector, fragile and expensive. In addition, this device is unwieldy, and only allows to detect temperatures of the order of cryogenic temperatures and does not allow to easily detect temperatures warmer than -60 0 C and therefore can not detect temperature changes due to leaks of hot liquids.
- the object of the invention is to overcome the disadvantages of the state of the art by providing a device for measuring temperature changes when it is configured for plant monitoring for a given temperature value range.
- the temperature range in which the device according to the invention can be used is very wide, it varies from -269 ° C to + 3000 ° C., while preserving a measurement accuracy and a simplicity of device and process for the implementation implementation of the device.
- a device as indicated at the beginning wherein said means comprises a hollow heat-conducting tube adapted to contain a fluid, said heat-conducting tube comprising a first end and a second end, one of which both is connected to said detector and at least one of which is closed.
- This device is an extremely simple device in which the temperature changes are measured indirectly through the variation of a physical quantity of the fluid contained in the thermoconductor (volume, pressure, etc.). If it is a liquid, in the case of a heating to be detected, for example in the case of an overflow of a very hot liquid of a tank, the pressure will increase sharply since the liquid content in the tube will expand, or even gasify. If, on the contrary, it is a leak of a cryogenic liquid to be detected, and if the thermally conductive tube comprises ad hoc gas, for example CO 2 , the latter will, under the effect of the cooling, pass from the gaseous state in the liquid state, which will cause a rapid pressure drop.
- a physical quantity of the fluid contained in the thermoconductor volume, pressure, etc.
- the heat conducting tube is a metal tube or based on a metal alloy.
- a metal or metal alloy tube is adequate, but any other resistant and thermally conductive material is also suitable.
- thermally conductive tube must also be made from a material capable of withstanding the temperature of the fluid to be detected, the material of the tube must be chemically compatible with the fluid to be detected, the tube must be able to withstand at a certain pressure.
- the fluid contained in the tube is in gaseous form.
- the gaseous fluid contained in said heat conducting tube is at a pressure different from the atmospheric pressure.
- the physical quantity to be measured will be the pressure and the device will comprise as a pressure sensor a pressure gauge for reading the pressure in the thermoconductive tube and this pressure value will detect a temperature change undergone by the thermoconductor.
- the manometer is provided for generating a signal when the pressure of said fluid passes a predetermined pressure threshold.
- the manometer provided for generating a signal is for example a manometer connected to a relay, in which case the emitted signal opens or closes the relay, which generates respectively a cutoff or a signal transmission.
- the manometer may be an electronic manometer thereby generating an electronic signal. That is, when the pressure of the fluid contained in the thermoconductive tube decreases, for example because a cryogenic liquid flows or leaks thereon, it is conceivable that the pressure gauge is a manometer "intelligent" and that, because the critical pressure has been exceeded, it emits a signal.
- This signal can be a directly sound or visual signal because the manometer is equipped with the necessary for this purpose or a signal requesting further processing by transmitters and / or processors.
- the device according to the invention may further comprise a processor, connected to said detector, said processor being furthermore designed to determine a pressure variation over time ( ⁇ P / ⁇ t), to compare said variation of pressure over time (ratio ⁇ P / ⁇ t) to a predetermined value ( ⁇ P / ⁇ t) x .
- the device comprises an alarm signal generator, connected to an output of said processor, said alarm signal generator being arranged to emit at least one alarm signal.
- the processor can, compared with what has just been mentioned above, send a signal to the alarm signal generator, so that it generates an alarm, that in a real case of change of temperature and not in the case of leakage of the fluid contained in the heat pipe.
- This embodiment avoids monitoring rounds and allows monitoring of the installation may undergo a change in temperature by the device according to the invention remote and / or automated.
- the end exposed to temperature changes is said at least one of the two closed ends of said heat conducting tube and the detector is connected at another end with respect to said at least one of the two closed ends exposed to the temperature change.
- the detector at said other end is located in an area remote from an area liable to undergo temperature changes where said at least one of the two closed ends is disposed, when said device is in place, the two said ends being connected by means of said heat conducting tube.
- the invention also relates to a use of the temperature change detection device according to the invention for the detection of leakage of hot, cold and even cryogenic liquids (ultracold).
- Figure 1 is a schematic illustration of the device according to the invention.
- Figure 2a is a schematic view of an embodiment of the invention and its use in the detection of leaks of cryogenic liquids.
- Figure 2b is a schematic view of the same embodiment of the invention as in Figure 2a and its use in detecting an overflow of a vessel containing a hot liquid.
- Figure 3 is a schematic view of the same embodiment of the invention as in Figure 2a or 2b, but the use of which is different.
- the invention is used to detect a heating of a cold room at -20 ° C.
- Figure 1 illustrates a preferred embodiment of the device according to the invention.
- This comprises a hollow heat-conducting tube 1, a first end 7 of which is closed by a plug 2.
- the heat-conducting tube 1 contains a fluid 3, preferably in gaseous form 3 whose pressure is measured by a pressure gauge 4.
- Downstream of the manometer 4 is possibly another manometer 5 or a detector with its processor possibly connected to an alarm signal transmitter (not shown).
- the processor 5 may be programmed to emit a signal in the event of a sudden decrease in pressure if the zone to be monitored is likely to undergo a sudden decrease in temperature following a leakage of cryogenic liquid 9.
- the processor 5 may be programmed to transmit a signal in the event of a sudden increase in pressure corresponding for example to a dispensing of hot liquid on one of the ends 2 of the device. The transmission of the signal will in fact be carried out by comparison.
- the presence of a processor 5 by comparing the pressure variation over time (ratio ⁇ P / ⁇ t) to a predetermined value ( ⁇ P / ⁇ t) x .
- the device further comprises an isolation valve or a valve 8. Upstream of manometer 4, there is also a plug 2 (preferably bicone type) to close the other end 6 of the heat-conducting tube 1 hollow.
- thermoconductive tube surrounding the area to be monitored must be filled with a gas 3, the physical characteristics of which, at the pressure at which it is confined in the tube 1, the gas 3 liquefies or even solidifies at room temperature. where the heat conducting tube is brought into contact with a cryogenic liquid 9.
- the nature of the fluid 3 will also depend on the normal temperature of the area to be monitored (if it is subject to atmospheric conditions, it will avoid the liquefaction of the fluid during freezing).
- the tube 1 is no longer subjected to contact with the cryogenic liquid 9, the latter 1 is heated as well as the fluid 3 that it contains.
- the latter 3 will vaporize and the original pressure will reappear.
- the detection system becomes automatic and naturally operational.
- cryogenic liquid 9 The principle used here for the case of the detection of cryogenic liquid 9, being the physical property that some gases have a significant decrease in volume when they liquefy or solidify.
- FIGS. 2a, 2b and 3 Other forms of use are illustrated in FIGS. 2a, 2b and 3. These embodiments are based exactly on the same operating principle. The only different characteristic being the temperature change to be detected since the leakage of liquid to be detected will result, in the case of FIG. 2a, by a sudden decrease in temperature (leakage of cryogenic liquid 9 from a tank 10), temperature increase abrupt (overflow of hot liquid from a tank 10), lower temperature decrease due to the heating of a chamber 10 at -50 0 C which has forgotten to close the door 11.
- An example of a gas that can be used for cryogenic liquid leak detection is CO2.
- a table of value is given below making it possible to relate the liquefaction temperature (condensation) of this gas with respect to the pressure of the gas. These data are given by way of example and can in no way be understood as limiting the invention to the use of CO 2 . Many other gases could be used in this context, such as ammonia.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2005800210545A CN1973194B (zh) | 2004-06-28 | 2005-06-21 | 温度变化检测设备 |
JP2007517515A JP2008504518A (ja) | 2004-06-28 | 2005-06-21 | 温度変化を検出する、特に低温液体漏れを検出する、装置および方法 |
US11/571,114 US20080008223A1 (en) | 2004-06-28 | 2005-06-21 | Device and Method for Detecting a Temperature Variation, in Particular for Detecting a Cryogenic Liquid Leakage |
EP05755921A EP1809998A1 (fr) | 2004-06-28 | 2005-06-21 | Dispositif et procede de detection de changement de temperature, en particulier pour la detection d'une fuite de liquide cryogenique |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE2004/0317A BE1016101A3 (fr) | 2004-06-28 | 2004-06-28 | Dispositif et procede de detection de changement de temperature, en particulier pour la detection d'une fuite de liquide cryogenique. |
BE2004/0317 | 2004-06-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006005998A1 true WO2006005998A1 (fr) | 2006-01-19 |
Family
ID=34973961
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2005/001744 WO2006005998A1 (fr) | 2004-06-28 | 2005-06-21 | Dispositif et procede de detection de changement de temperature, en particulier pour la detection d'une fuite de liquide cryogenique |
Country Status (6)
Country | Link |
---|---|
US (1) | US20080008223A1 (fr) |
EP (1) | EP1809998A1 (fr) |
JP (1) | JP2008504518A (fr) |
CN (1) | CN1973194B (fr) |
BE (1) | BE1016101A3 (fr) |
WO (1) | WO2006005998A1 (fr) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5793675B2 (ja) * | 2009-07-31 | 2015-10-14 | パナソニックIpマネジメント株式会社 | 符号化装置および復号装置 |
FR3016035B1 (fr) * | 2013-12-26 | 2016-02-12 | Grdf | Equipement de releve et de transmission de valeurs mesurees de temperature |
GB2533936B (en) | 2015-01-07 | 2017-10-25 | Homeserve Plc | Flow detection device |
GB201501935D0 (en) | 2015-02-05 | 2015-03-25 | Tooms Moore Consulting Ltd And Trow Consulting Ltd | Water flow analysis |
USD800591S1 (en) | 2016-03-31 | 2017-10-24 | Homeserve Plc | Flowmeter |
CN108072498B (zh) * | 2016-11-16 | 2024-03-01 | 中国石油天然气集团公司 | 低温气体泄露检测系统 |
US10437757B2 (en) * | 2017-10-20 | 2019-10-08 | Hewlett Packard Enterprise Development Lp | Determine priority of requests using request signals and priority signals at an arbitration node |
CN109612642B (zh) * | 2019-01-30 | 2020-10-30 | 江苏苏盐阀门机械有限公司 | 一种球阀密封性测试设备 |
IT201900006922A1 (it) * | 2019-05-16 | 2020-11-16 | Ft System Srl | Metodo ed apparato per stabilire la presenza di fessure in contenitori sigillati |
CN113551840A (zh) * | 2021-07-22 | 2021-10-26 | 中国核动力研究设计院 | 基于光纤测温技术的阀门内漏监测系统及监测方法 |
Citations (3)
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US2972132A (en) * | 1957-09-10 | 1961-02-14 | Charles B Putney | Control system |
US4091657A (en) * | 1976-12-20 | 1978-05-30 | Bell Telephone Laboratories, Incorporated | Heat detecting apparatus and method |
EP0456366A2 (fr) * | 1990-05-10 | 1991-11-13 | British Gas plc | Dispositif de détection d'une fuite ou le répandement d'un liquide froid |
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GB1413481A (en) * | 1972-01-14 | 1975-11-12 | Tweedy Of Burnley Ltd | Treatment of foodstuffs |
FR2298145A1 (fr) * | 1975-01-20 | 1976-08-13 | Kapa Sa | Perfectionnements aux detecteurs thermovelocimetriques d'incendie |
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JP2715903B2 (ja) * | 1994-03-16 | 1998-02-18 | 日本電気株式会社 | 温度モニタ |
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-
2004
- 2004-06-28 BE BE2004/0317A patent/BE1016101A3/fr not_active IP Right Cessation
-
2005
- 2005-06-21 EP EP05755921A patent/EP1809998A1/fr not_active Withdrawn
- 2005-06-21 CN CN2005800210545A patent/CN1973194B/zh not_active Expired - Fee Related
- 2005-06-21 WO PCT/IB2005/001744 patent/WO2006005998A1/fr active Application Filing
- 2005-06-21 JP JP2007517515A patent/JP2008504518A/ja active Pending
- 2005-06-21 US US11/571,114 patent/US20080008223A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2972132A (en) * | 1957-09-10 | 1961-02-14 | Charles B Putney | Control system |
US4091657A (en) * | 1976-12-20 | 1978-05-30 | Bell Telephone Laboratories, Incorporated | Heat detecting apparatus and method |
EP0456366A2 (fr) * | 1990-05-10 | 1991-11-13 | British Gas plc | Dispositif de détection d'une fuite ou le répandement d'un liquide froid |
Also Published As
Publication number | Publication date |
---|---|
CN1973194A (zh) | 2007-05-30 |
US20080008223A1 (en) | 2008-01-10 |
JP2008504518A (ja) | 2008-02-14 |
CN1973194B (zh) | 2011-02-23 |
BE1016101A3 (fr) | 2006-03-07 |
EP1809998A1 (fr) | 2007-07-25 |
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