WO2006021439A1 - Procede et appareil de detection de fuite interne entre au moins deux fluides s'ecoulant et/ou circulant dans une installation de traitement - Google Patents

Procede et appareil de detection de fuite interne entre au moins deux fluides s'ecoulant et/ou circulant dans une installation de traitement Download PDF

Info

Publication number
WO2006021439A1
WO2006021439A1 PCT/EP2005/009145 EP2005009145W WO2006021439A1 WO 2006021439 A1 WO2006021439 A1 WO 2006021439A1 EP 2005009145 W EP2005009145 W EP 2005009145W WO 2006021439 A1 WO2006021439 A1 WO 2006021439A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid
visual appearance
value
fluids
digital image
Prior art date
Application number
PCT/EP2005/009145
Other languages
English (en)
Inventor
Per Bruun Famme
Original Assignee
Cleansolve Holding Aps.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cleansolve Holding Aps. filed Critical Cleansolve Holding Aps.
Publication of WO2006021439A1 publication Critical patent/WO2006021439A1/fr

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
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
    • G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
    • G01M3/226—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
    • G01M3/228—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators for radiators
    • 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
    • G01M3/38—Investigating fluid-tightness of structures by using light

Definitions

  • Leak control by pressure testing is performed by applying a pressure to one side e.g. the service side of the heat exchanger, following which a measurement of a pressure drop will indicate a leak in the surfaces between the product and service sides.
  • This technology has the general weakness that a measurable pressure drop within a reasonable measuring period requires a considerable leak between the internal and external side.
  • a method for detection of an internal leakage between at least two fluids flowing and/or circulating in a process plant wherein changes of a visual appearance of at least one of the flowing and/or circulating fluids are identified, wherein successive images of the at least one fluid comprising a number of pixels are obtained using digital image generating means for generating respective signals for each pixel; each of said successive images being processed via digital processing technique to calculate a respective value for the visual appearance of the fluid; a change of the visual appearance of the fluid being identified if the calculated respective values for the visual appearance are not constant, which change may be an indication of an internal leakage between the at least two fluids.
  • the respective value for the visual appearance of the fluid can be obtained by conducting an operation on all respective signals and conducting the reverse operation on the result of the first operation, wherein the operation can be for instance building the sum of the squares of the respective signals and the inverse operation can be dividing the square root of the result of the operation by the number of signals.
  • said successive images can each comprise a first group of pixels of a first colour, and second group of pixels of a second colour, and preferably a third group of pixels of a third colour, wherein values for each group can be calculated from the signals of the respective group of pixels and the value for the visual appearance of the fluid can be calculated based on the values for each group.
  • the light source can be regulated at the beginning such that the digital image generating means is not saturated.
  • said digital image generating means can comprise a CMOS sensor and/or a CCD sensor and/or digital camera means and/or a digital camera.
  • said digital image generating means can comprise an image sensor without optics. Since the signals of the individual pixels of the image are processed to obtain for each image one value for the visual appearance of the fluid it is clear that no sharp image of the fluid is required. On the contrary it may be advantageous to have an unsharp or unfocussed image because it that case the individual signals will more or less have the same level which may increase the sensitivity further. Therefore it is not necessary to provide optics which saves costs and space.
  • the reaction product can be fluid, gaseous and/or solid, and/or clear and/or coloured.
  • the process plant can be a heat exchanger.
  • the at least one fluid can be one of the two heat exchanging flowing media flowing and/or circulating through the heat exchanger.
  • a rate of change of the value for the visual appearance of the fluid can initiate the interruption of a process running in the process plant.
  • the value for the visual appearance of the fluid can be determined by a measurement in an online flow cell mounted with said digital image generating means.
  • a method for identifying changes of a visual appearance of a liquid in which method the liquid is enlighted and successive images of the liquid are recorded using digital camera means comprising a number of pixels; each of said successive images being processed via digital image processing technique to calculate a value for the visual appearance of the liquid; a change of the visual appearance of the liquid being identified if the calculated values for the visual appearance are not constant, wherein the method is used in a process comprising a flowing and/or circulating liquid, wherein the process takes place in a heat exchanger and the liquid is one of two heat exchanging media flowing through the heat exchanger.
  • the apparatus in accordance with the invention has the advantage of a very high sensitivity for the same reasons as stated above in relation to the method embodiments of the invention.
  • said digital processing technique means can obtain the respective value for the visual appearance of the fluid by conducting an operation on all respective signals and conducting the reverse operation on the result of the first operation, wherein the operation is for instance building the sum of the squares of the respective signals and the inverse operation is dividing the square root of the result of the operation by number of signals.
  • said successive images can each comprise a first group of pixels of a first colour, and second group of pixels of a second colour, and preferably a third group of pixels of a third colour, wherein values for each group are calculated from the signals of the respective group of pixels and the value for the visual appearance of the fluid is calculated based on the values for each group.
  • said digital processing technique means can disregard signals exceeding an upper limit and/or signals being under a lower limit for the calculation of the value.
  • said digital image generating means can comprise a light source for enlighten the at least one fluid. It is clear that enlightening the fluid can be advantageous to increase the number of photons to be detected by the digital image generating means.
  • the apparatus can further comprise regulating means for regulating the light source at the beginning such that the digital image generating means operates with a high sensitivity.
  • said digital image generating means can comprise a first group of photo-detectors or photodiodes being sensitive for a first colour, and a second group of photo-detectors or photodiodes being sensitive for a second colour, and preferably a third group of photo-detectors or photodiodes being sensitive for a third colour, wherein each of the photo-detectors or photodiodes have a respective band-pass filter.
  • the apparatus can further comprise means for adding a first substance to one of the at least two fluids and/or means for adding a second substance to the another one of the at least two fluids, wherein the first and second substances being brought into contact preferably form a reaction product causing a detectable change of the visual appearance of the fluid containing the reaction product.
  • the apparatus can further comprise interruption means for interrupting a process running in the process plant if a rate of change of the value for the visual appearance of the fluid exceeds a lower limit.
  • the value for the visual appearance of the fluid is calculated in relation to a reference value.
  • the calculation of the value for the visual appearance of the fluid comprises the steps of: determining an initial reference value for each pixel; subtracting the value for each pixel in the obtained image from the initial reference value for the corresponding pixel in order to create a difference image; and summing the values of the pixels in the reference image and dividing by the number of pixels.
  • CMOS sensor Such elements are standard devices that can be easily adapted to this specific use by the person skilled in the art, and they can be mounted such that the process fluid that passes through the flow cell is measured continuously and via a processor module it is presented as digitalised vision data.
  • Figure 6 is a diagram showing the correlation between the digital measurement value as a function of time when fluid being at the product side and comprising a tracer passes due to pressure from the product side of a plate heat exchanger through a hole (leak) into the service side containing tap water, wherein air bubbles are not removed.
  • the signals from the 102,400 photo-detectors belonging to the same class of band pass filter or the signals of all working photo-detectors are accumulated, it is possible to suppress the overall occurring signal noise so much that even small variations in the spectral composition of the registered light can be determined.
  • the sensor measuring value increases steadily showing the presence of a leak in the heat exchanger. After the pressure on the HP side is turned off there is no significant change of the value, i.e. the value is constant again.
  • the method apparatus in accordance with the invention for identifying a change of a visual appearance of a fluid has been described both in general terms and in connection with a specific embodiment as show in the figures.
  • the use of the method has been concerned about leak detection in heat exchangers and about cleaning processes.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

L'invention concerne un procédé et un appareil de détection d'une fuite interne entre au moins deux fluides s'écoulant et/ou circulant dans une installation de traitement, dans lesquels les changements d'aspect visible d'au moins un des fluides sont identifiées, et des images successives du ou des fluides comprenant plusieurs pixels étant obtenues par un moyen de génération d'image numérique pour la génération de signaux respectifs pour chaque pixel. Chacune des images successives est traitée par une technique de traitement numérique afin de calculer une valeur respective pour l'aspect visuel du fluide. Un changement de l'aspect visuel du fluide est identifiée si les valeurs respectives calculées pour l'aspect visuel ne sont pas constantes, changement pouvant indiquer une fuite interne entre le ou les fluides.
PCT/EP2005/009145 2004-08-25 2005-08-24 Procede et appareil de detection de fuite interne entre au moins deux fluides s'ecoulant et/ou circulant dans une installation de traitement WO2006021439A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200401285 2004-08-25
DKPA200401285 2004-08-25

Publications (1)

Publication Number Publication Date
WO2006021439A1 true WO2006021439A1 (fr) 2006-03-02

Family

ID=35385726

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/009145 WO2006021439A1 (fr) 2004-08-25 2005-08-24 Procede et appareil de detection de fuite interne entre au moins deux fluides s'ecoulant et/ou circulant dans une installation de traitement

Country Status (1)

Country Link
WO (1) WO2006021439A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08292185A (ja) * 1995-04-21 1996-11-05 Anima Denshi Kk 廃液漏洩検知装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08292185A (ja) * 1995-04-21 1996-11-05 Anima Denshi Kk 廃液漏洩検知装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 03 31 March 1997 (1997-03-31) *

Similar Documents

Publication Publication Date Title
US5619333A (en) Flow contamination monitor
CN100439898C (zh) 表面粒子检测器
US6151108A (en) On-line measurement of contaminant level in lubricating oil
CA1130604A (fr) Detecteur et methode de detection pour dispersion type huile dans l'eau
FR2823847A1 (fr) Procede et dispositif de detection de fuite dans un echangeur de chaleur, notamment a plaques
US9341612B2 (en) System and method for monitoring a fluid
US6779385B2 (en) Method and device for monitoring moisture content of an immersed solid dielectric material
US20090044707A1 (en) Oil quality sensor and oil heater for deep fryers
US5446544A (en) Turbidimeter
FR2597189A1 (fr) Dispositif d'evaluation du fonctionnement d'un purgeur de vapeur
CN211877766U (zh) 一种基于红外摄像的水体浊度测量装置
JPH0634541A (ja) 潤滑油劣化モニター装置
WO2006021439A1 (fr) Procede et appareil de detection de fuite interne entre au moins deux fluides s'ecoulant et/ou circulant dans une installation de traitement
US3710111A (en) Dynamically calibrated oil content meter
US20200060217A1 (en) Milking system
JP3095954B2 (ja) 水道水の色および濁りの検知装置
CN103487352A (zh) 一种涂料粘度测定仪的智能清洗检控系统及其检控方法
JP3427580B2 (ja) 水道水質自動監視装置のフィルタの劣化検出方法
JP3061873B2 (ja) 密封要素のシール性検査方法およびその装置
JPH09145525A (ja) 漏れ検出方法及び漏れ検出装置
JPH10115585A (ja) 液体の色・濁り計測装置の自己診断方法
CN218331078U (zh) 一种石油含水量测量装置
JPH0125017B2 (fr)
US10705015B2 (en) System, method and apparatus for continuous evaluation, detection and storage of colorimetric wavelength changes on a chemically impregnated media useful in the detection of gases
CN208091912U (zh) 一种油液品质的检测装置

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KM KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU LV MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase