AU721004B2 - Device for detecting and locating leakage fluids in sealing systems - Google Patents
Device for detecting and locating leakage fluids in sealing systems Download PDFInfo
- Publication number
- AU721004B2 AU721004B2 AU45491/97A AU4549197A AU721004B2 AU 721004 B2 AU721004 B2 AU 721004B2 AU 45491/97 A AU45491/97 A AU 45491/97A AU 4549197 A AU4549197 A AU 4549197A AU 721004 B2 AU721004 B2 AU 721004B2
- Authority
- AU
- Australia
- Prior art keywords
- measuring
- sheetlike structure
- sealing
- resistance
- area
- Prior art date
- Legal status (The legal status 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 status listed.)
- Ceased
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
-
- 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
- G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
- G01M3/18—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/186—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
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- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Biochemistry (AREA)
- Immunology (AREA)
- Electrochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Pathology (AREA)
- Examining Or Testing Airtightness (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention concerns a device for detecting and locating leakage fluids in sealing systems, said device being characterized by a single-layer flat structure (4) which comprises electrically conductive particles and/or fibres and is disposed all-over the exterior of a sealing region to be monitored. The flat structure comprises an area-specific electrical resistance which, when wetted with an electrically conductive fluid, decreases in the region of the wetting and, when wetted with an electrically non-conductive fluid, increases in the region of the wetting. The flat structure (4) is further provided with a plurality of measuring contacts (5, 6) which are connected via one or a plurality of bus transmission lines to a measuring and evaluating arrangement (9) by means of which the electrical resistance of the flat structure (4) and/or the potential distribution can be measured in relation to a counter electrode disposed on the interior of the sealing region to be monitored, and a variation in the local resistance distribution and/or potential distribution within the flat structure (4) can be determined.
Description
MY/ab 96561WO September .1997 DEVICE FOR DETECTING AND LOCATING LEAKAGE FLUIDS IN SEALING SYSTEMS The present invention relates to a device for the selective detection and location of leakage fluids in g* sealing systems.
0 De
S
DE 69014264 T2 describes a method for detecting leakages in an insulation layer which for example is installed below a waste dump to protect the groundwater against 0 0 contaminated leakage water from the waste dump. In this, a first and a second geotextile material are arranged, said geotextile materials being separated from each other by a further insulation layer. Woven into the two geotextile materials are electrically-conductive, 6 essentially parallel-aligned threads, with the geotextile materials being arranged in such a way that the conductive threads of the first geotextile material form San angle of preferably 900 with the conductive threads of the second geotextile material. This known process is characterised in that the conductive threads are combined in pairs, with the spacing between the pairs being further apart than the thread spacing in the pair. In order to detect a leakage, the electrical voltage and/or the resistance between two conductive threads forming a pair is determined. The location of the leakage can thus be established by cross-position fixing.
2 This known method has the disadvantage in that detection of a leakage is ensured only if the conductive threads are woven into the geotextile materials with narrow spacing between said threads. For if the conductive threads are spaced relatively wide apart, and if only a small amount of liquid leaks from a defective position in the insulation layer, then bridging of the conductive threads by the liquid leaking out, and thus detection of the damage, isnot ensured in every case. Since in addition, it cannot be assumed that damage always only relates to the inner insulation layer but, especially V 0 with damage occurring in the construction phase, very 6e00 0 often also relates to the insulation layer between the 0U 0 two geotextile materials comprising the conductive 000o 900" threads itself, under certain circumstances, leakage liquid can enter the ground without such damage being detected.
0000 If however the spacing of the parallel conductive threads 0 is selected so narrow as to really ensure detection of a leakage, then the number of measuring contacts which must 0 be connected to the conductive threads is accordingly 0000 high. However, this requires very considerable effort resulting in relatively high production costs of such 0 0 Sleakage detection and location systems.
o oe Furthermore it would be desirable if a device were available which would enable the detection not only of electrically conductive leakage fluids such as for example leakage water, but also electrically non-conductive leakage fluids such as for example heating oil.
3 From EP 0372697 A2 a sensor for the detection of oil leaks is already known. However, the known sensor is not suitable for the detection of leakage water or other aqueous leakage fluids because it comprises a resistor surrounded by an encasing made of a porous waterrepellent resin, and is itself formed from a porous, water-repellent resin comprising electrically conductive carbon particles, said carbon particles comprising a water-repellent layer.
The present invention aims to provide an alternative device of the type mentioned in the introduction for the detection of leakages in sealing systems both in the case of conductive and non-conductive leakage fluids, and which in addition can be produced economically.
In one aspect this invention resides broadly in a device characterised by a single-layer sheetlike structure including electrically conductive particles and/or fibres, said structure being arranged all over-the exterior of a sealing area to be monitored, and including an area-specific electrical resistance; said resistance decreasing in the area of wetting when wetted with an electrically conductive liquid, and said resistance increasing in the area of wetting when wetted with an electrically non-conductive liquid; with the sheetlike 'structure including an array of measuring contacts which are connected to a measuring and evaluation device by way of one or several bus transmission lines; by means of said measuring and evaluation device the electrical resistance of the sheetlike structure and/or the potential distribution can be measured in relation to a counter electrode arranged on the inside of the sealing 4 area to be monitored, and a change of the local resistance distribution and/or potential distribution within the sheetlike structure can be determined.
With the device according to the invention, containers as well as sealing systems can be reliably monitored for leakage of both electrically conducting and nonconducting fluids, with even small quantities of leakage being detectable. The number of measuring contacts required for this is comparatively small so that the device according to the invention is relatively economical to realise. The use of the bus transmission line or lines also contributes to this. Furthermore, the 0* device according to the invention makes it possible to exactly locate the place of damage, consequently the respective leakage can be repaired in a selective way and at justifiable cost. The number and spacing of the measuring contacts are suitably to be selected in such a way that the resistance distribution in the sheetlike structure can be determined with a sufficient local S: resolution over its entire area. In conjunction with a counter electrode arranged in the interior region of a seal to be monitored, the device according to the 0*SS invention additionally makes it possible to monitor the insulation resistance of the seal as well as to locate the defective position by means of the potential distribution occurring within the sheetlike structure.
Consequently, moisture in the sheetlike structure due to condensation can be distinguished from moisture due to damage, and locating any leakage is possible even when the sheetlike structure is moist throughout, e.g. as a result of condensation.
5 The measuring and evaluation device can measure the electrical resistance of the sheetlike structure either continuously or at specified times. In addition it can determine the resistance of the sheetlike structure in relation to a counter electrode and it can determine the potential distribution in the sheetlike structure in relation to a counter electrode.
The electrically conductive particles and/or fibres of the sheetlike structure preferably include metal and/or conductive carbon. The sheetlike structure, which is preferably made on the basis of a nonwoven fibre fabric or a fine, grid-like net structure, is preferably made in such a way that electrical conduction takes place between any points in the sheetlike structure, substantially via •the surface of the particles and/or fibres.' According to a further advantageous embodiment, the outside of the sheetlike structure is provided with a liquid-impermeable layer. This arrangement is particularly advantageous if the sealing system to be monitored is situated in the ground and one has to expect that groundwater and/or surface water will impinge on the sheetlike structure thus possibly leading to a change in the electrical resistance of the sheetlike structure.
s go A further advantageous embodiment provides for at least one counter electrode which is located within the sealing system or in the ground outside the sealing system. In this way if there is a liquid-impermeable layer on the inside or outside of the sheetlike structure it can be detected whether the layer is intact or damaged.
According to another advantageous embodiment of the invention, the measuring contacts for coupling to the sheetlike structure include a contact surface made of conductive foam material, preferably conductive polyurethane foam. In this way a perfect coupling to the sheetlike structure is achieved, with said coupling being easy to produce. This applies in particular when using polyurethane foam material, which due to its high micro-.
deformability and at the same time superior conductivity, is able to contact the sheetlike structure with a low transition resistance between a metallic contact surface of the measuring contact and the sheetlike structure.
0e A further preferred embodiment of the invention is characterised in that the measuring contacts,are arranged spread out on the sheetlike structure. In this way more see* exact location of leakages can be achieved because, due to the two-dimensional evaluation of the measuring results, position fixing of the damage is not solely limited to segments situated between the measuring contacts arranged at the periphery of the sheetlike structure, but with increased accuracy can also take place between the measuring contacts spread out on the sheetlike structure.
S
For interrogating the measuring contacts, preferably a hybrid analog-digital bus system is provided whose S" digital and analog lines are series-connected, with switches at the measuring contacts being able to be activated via the digital part of the bus, said switches connecting the analog signal and data lines to the respective measuring contact.
7 SBelow, the invention is illustrated in more detail by means of a drawing showing one embodiment. In the drawing 00 a .ini a~ qy Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 is a diagrammatic illustration of a tank shown in a section view, wherein the tank comprises a device according to the invention; is a top view of the tank and the device according to the invention of Figure 1; is a perspective view of a section of a sheetlike structure of the device according to the invention; is a perspective exploded view showing an example of distributing the measuring contacts on the sheetlike structure; and are various views of a serial coupling element for producing a measuring contact on the sheetlike structure.
i Sm 6 6e
S.
Figures 1 and 2 show a tank 1 in which a waterendangering liquid 2, such as e.g. heating oil or fuel, is stored. Reference 3 designates the lockable filling aperture of the tank 1.
All over the bottom and the sides of the tank 1, there is a sheetlike structure 4 which, preferably based on a nonwoven fibre fabric, comprises electrically-conductive particles and/or fibres. The sheetlike structure 4 is made in such a way that electrical conduction takes place between any points in the sheetlike structure 4, essentially across the surface of the particles or fibres. The specific resistance of the conductive -8 particles or fibres and their mass per unit of area are matched in such a way that the sheetlike structure 4 has an area-specific electrical resistance; said resistance decreases in the area of wetting when wetted with an electrically conductive liquid, and said resistance increases in the area of wetting when wetted with an electrically non-conductive liquid.
The sheetlike structure 4, at its upper edge surrounding the tank, comprises an array of measuring contacts 5 to 8, between which the electrical resistance of the sheetlike structure can be measured at any time by means of an automatic measuring and evaluation device 9. The measuring contacts 5 to 8 are arranged in pairs, with the individual pairs on the one hand forming parallel measuring taps and on the other hand intersecting measuring taps. The number and spacing of the measuring taps is selected in such a way that the resistance distribution for the entire area of the sheetlike structure 4 can be determined with adequate local resolution.
As an alternative to, or in addition to, the arrangement a shown in the drawing, the measuring contacts can also be arranged spread out in a matrix-like arrangement, in oo* specified locations on the sheetlike structure (see Fig.
0. 4).
The measuring contacts 5 to 8 shown in Figures 1 and 2 are connected to the measuring and evaluation device 9 via bus transmission lines 11 to 14. A hybrid analogdigital bus system is used which does not require expensive analog-digital conversion at the measuring taps.
9 Via the digital part of the bus, switches at the measuring contacts are activated, said switches connecting the analog signal and data lines to the measuring contact.
The measuring and evaluation device comprises a display device (not shown), for example in the form of a monitor, by way of which the location or the coordinates of any leakage are displayed. Furthermore, the measuring and evaluation device 9 comprises a signal device (not shown) which signals any leakage by an acoustic and/or visual alarm signal. Moreover, the measuring and evaluation 0e* device 9 comprises a modem 15 for remote transfer of the acquired measuring data.
If the resistance distribution of the sheetlike structure 4 is known prior to filling the tank 1, i.e. without leakage fluid impinging on the sheetlike structure 4, then by comparing the resistance distribution measured at a later time with the first measured resistance So*. distribution, any occurrence of a leakage can be detected Sby local increase or decrease of resistance values. In this way, any change of resistance values is at first limited to the area which is moistened by liquid, thus locating the leakage is possible.
0*0* S00 Since it cannot be ruled out that the leakage fluid will spread in the monitored area or below a seal to be monitored, thus rendering exact position fixing no longer possible, the number of measuring cycles of the measuring and evaluation-device is set sufficiently high to ensure that the resistance distribution is established immediately after the first appearance of the leakage 10 fluid, before the liquid has spread out over a larger area.
Figure 3 shows a diagrammatic marginal section of a sheetlike structure 4 according to the invention. It can be noted that the sheetlike structure 4 comprising electrically conductive particles and/or fibres, has at its margin a connection element 5 forming a measuring contact. Furthermore, on its outside, -the sheetlike structure 4 comprises a liquid-impermeable layer 10, for example a plastic layer.
O*
The application of the device according to the invention is not solely limited to leakage monitoring of containers and sealing systems but is in particular also suitable for monitoring pipelines carrying water-endangering liquids. For this purpose, the sheetlike structure 4 shown in Figure 4 is produced in, or cut to, strip shapes or lengths of material.
S* C To produce an extensive sheetlike structure, several lengths of material can be adjoined, maintaining a certain overlap, for example 5 cm. To achieve good contact in the area of overlap it is advantageous if the e segment of the sheetlike structure overlapping on the top or outside, is placed with a longitudinal fold onto the longitudinal margin of the segment below, and that along the margin of overlap, both segments are held together by adhesive tape. In this, the segments can be 2 m or 4 m wide.
11 Fig. 4 is a diagrammatic view of an embodiment where the device according to the invention is used for monitoring a sealing membrane 16 of a flat roof for any leakage. The sheetlike structure 4 which is preferably produced from nonwoven fibre fabric is arranged below the sealing membrane 16 to be monitored (shown partially cut away) and on one side comprises an array of measuring contacts 17 in a matrix-like arrangement. The sheetlike structure 4 acts as an effective sensor surface over the entire area. In order to detect any leakage, on top of the roof sealing membrane at least one counter electrode 18 is arranged. If the sealing membrane 16 is intact, then the
OS..
resistance measured between one of the measuring contacts 17 and the counter electrode 18 is very high. By 0 contrast, if rain water enters as a result of a leakage, the resistance of the sheetlike structure 4 is low in the
SO.
area of moistening. By sequential interrogation of the individual measuring contacts 17, the leakage in the roof seal 16 can quickly be located. Below the sheetlike structure 4, a further seal 20 as well as at least one 0055 further counter electrode 21 can be provided as an 0*QQ additional protection for the roof structure 19 below said sheetlike structure.
0000 &**see Figures SA to 5C show a lateral view (Fig. 5A), a top O+eO 0* view (Fig. 5B) and a bottom view (Fig. SC) of a preferred embodiment of a measuring contact module 17 to be arranged on the sheetlike structure. The contact surface of the module 17 comprises a conductive polyurethane foam material. In this way a good contact between the measuring points and the sheetlike structure is achieved.
Both in the digital and in the analog lines of the bus system the measuring positions are series-connected and together with the circuit electronics and a contact 12 surface 22 are sealed in the module case 23 made of epoxy resin.
S
0 0 0 0 00 0000 0 0000 00 0 0 0 0 0 0000 0 0000 00 0@ *0 0 *000
S
00 0 0 0000 *00#
S
0 00 0 0 0* 0 00
Claims (7)
1. A device for detecting and locating leakage fluids in sealing systems, characterised by a single-layer sheetlike structure including electrically conductive particles and/or fibres, said structure being arranged all over the exterior of a sealing area to be monitored, and including an area- specific electrical resistance; said resistance decreasing in the area of wetting when wetted with an electrically conductive liquid, and said resistance increasing in the area of wetting when wetted with an electrically non-conductive liquid; with the sheetlike structure including an array of measuring contacts which are connected to a measuring and evaluation device by way of one or several bus transmission lines; by means of which measuring and evaluation device the electrical resistance of the sheetlike structure and/or the potential distribution can be measured in relation to an counter electrode arranged on the inside of the sealing area to be monitored, and a change of the local resistance distribution and/or the potential distribution within the sheetlike structure can be determined.
2. A device according to claim 1, wherein the sheetlike structure includes particles and/or fibres made of metal and/or conductive carbon. 0
3. A device according to claim 1 or 2, wherein electrical conduction takes place between any points in the sheetlike structure, substantially via the surface of the particles and/or fibres.
4. A device according to one of the preceding claims, wherein on the outside the sheetlike structure includes a liquid-impermeable layer. -14- A device according to any one of the preceding claims, wherein means are provided by which a constant measuring current can be sent across at least part of the sheetlike structure, so that the voltage distribution in the sheetlike structure in which current flows, can be determined by means of the measuring contacts.
6. A device according to any one of the preceding claims, wherein at least one counter electrode is provided which is located within the sealing system or in the ground outside the sealing system.
7. A device according to any one of the preceding claims, wherein each of the measuring contacts includes a contact surface made of conductive foam material for coupling to the sheetlike structure.
8. A device according to any one of the preceding claims, wherein the measuring contacts are arranged spread out, preferably in a matrix-like arrangement. S 9. A device according to any one of the preceding claims, wherein for •interrogating the measuring contacts a hybrid analog-digital bus system is S- provided whose digital and analog lines are series-connected, with switches at the measuring contacts being able to be activated via the digital part of the bus, said switches connecting the analogue signal and e ,data lines to the respective measuring contact. A device for detecting and locating leakage fluids in sealing systems substantially as herein described with reference to the drawings.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19638734 | 1996-09-10 | ||
| DE19638734A DE19638734C2 (en) | 1996-09-10 | 1996-09-10 | Device for the selective detection and location of leakage liquids on sealing systems |
| PCT/DE1997/002045 WO1998011414A1 (en) | 1996-09-10 | 1997-09-10 | Device for detecting and locating leakage fluids in sealing systems |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU4549197A AU4549197A (en) | 1998-04-02 |
| AU721004B2 true AU721004B2 (en) | 2000-06-22 |
Family
ID=7806445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU45491/97A Ceased AU721004B2 (en) | 1996-09-10 | 1997-09-10 | Device for detecting and locating leakage fluids in sealing systems |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0925490B1 (en) |
| JP (1) | JP2001506745A (en) |
| AT (1) | ATE210285T1 (en) |
| AU (1) | AU721004B2 (en) |
| CA (1) | CA2265711A1 (en) |
| DE (2) | DE19638734C2 (en) |
| IL (1) | IL128755A (en) |
| WO (1) | WO1998011414A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19914658C2 (en) * | 1999-03-31 | 2003-10-02 | Ulrich Kuipers | Arrangement for measuring leaks in sealing systems for leak detection and leak detection of electrically conductive fluids and use of such an arrangement |
| DE19952911B4 (en) * | 1999-11-03 | 2005-03-03 | Kurt-Schwabe-Institut für Mess- und Sensortechnik e.V. Meinsberg | Method and device for in-situ monitoring of clay seals in landfills |
| DE10036362C2 (en) * | 2000-06-14 | 2002-06-13 | Progeo Monitoring Gmbh | Method and system for the detection and location of leaks in seals, in particular building seals |
| DE102006048490A1 (en) * | 2006-07-10 | 2008-04-24 | Walter Werne | Method and device for monitoring components |
| CN101581685B (en) * | 2008-07-02 | 2013-05-08 | 孙一慧 | Sensor instrument system including method for detecting analytes in fluids |
| KR20180102549A (en) | 2016-01-27 | 2018-09-17 | 크리스탑스 드라우딩스 | Electrically conductive multilayer material |
| CN111595538B (en) * | 2020-04-26 | 2022-12-30 | 山西杏花村汾酒厂股份有限公司 | Composite inspection method for ceramic wine bottle |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4947470A (en) * | 1989-02-14 | 1990-08-07 | Southwest Research Institute | System for locating leaks in a geomembrane-lined impoundment or landfill filled with material |
| US5191785A (en) * | 1991-04-16 | 1993-03-09 | Cpf Chemical Equipment Ltd. | Method and apparatus for identifying and locating a leak in the inner liner of a vessel having a laminated wall structure |
| WO1994002822A1 (en) * | 1992-07-17 | 1994-02-03 | Sensor | Device and method for inspection of status of insulating layer |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE6901426U (en) * | 1969-01-15 | 1969-05-14 | Georg Huettemann | SKILL GAME |
| US4404516A (en) * | 1980-10-29 | 1983-09-13 | Johnson Jr Victor R | System for detecting leaks from liquid-containing reservoirs and conduits |
| GB8717235D0 (en) * | 1987-07-21 | 1987-08-26 | Darling Products Ltd J E | Moisture leak alarm |
| JPH0279453U (en) * | 1988-12-08 | 1990-06-19 | ||
| EP0510045B1 (en) * | 1990-01-21 | 1995-08-02 | VON WITZKE GMBH & CO. | Sealing film with an electric measuring instrument for detecting leaks in the film |
| DE4324865A1 (en) * | 1993-07-23 | 1995-01-26 | Gore W L & Ass Gmbh | Leakage detection system |
-
1996
- 1996-09-10 DE DE19638734A patent/DE19638734C2/en not_active Expired - Fee Related
-
1997
- 1997-09-10 JP JP51315698A patent/JP2001506745A/en not_active Ceased
- 1997-09-10 AU AU45491/97A patent/AU721004B2/en not_active Ceased
- 1997-09-10 IL IL12875597A patent/IL128755A/en not_active IP Right Cessation
- 1997-09-10 CA CA002265711A patent/CA2265711A1/en not_active Abandoned
- 1997-09-10 EP EP97943760A patent/EP0925490B1/en not_active Expired - Lifetime
- 1997-09-10 WO PCT/DE1997/002045 patent/WO1998011414A1/en active IP Right Grant
- 1997-09-10 DE DE59705693T patent/DE59705693D1/en not_active Expired - Fee Related
- 1997-09-10 AT AT97943760T patent/ATE210285T1/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4947470A (en) * | 1989-02-14 | 1990-08-07 | Southwest Research Institute | System for locating leaks in a geomembrane-lined impoundment or landfill filled with material |
| US5191785A (en) * | 1991-04-16 | 1993-03-09 | Cpf Chemical Equipment Ltd. | Method and apparatus for identifying and locating a leak in the inner liner of a vessel having a laminated wall structure |
| WO1994002822A1 (en) * | 1992-07-17 | 1994-02-03 | Sensor | Device and method for inspection of status of insulating layer |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0925490A1 (en) | 1999-06-30 |
| CA2265711A1 (en) | 1998-03-19 |
| IL128755A0 (en) | 2000-01-31 |
| DE59705693D1 (en) | 2002-01-17 |
| ATE210285T1 (en) | 2001-12-15 |
| DE19638734C2 (en) | 2000-05-11 |
| EP0925490B1 (en) | 2001-12-05 |
| WO1998011414A1 (en) | 1998-03-19 |
| JP2001506745A (en) | 2001-05-22 |
| DE19638734A1 (en) | 1998-03-12 |
| IL128755A (en) | 2001-05-20 |
| AU4549197A (en) | 1998-04-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGA | Letters patent sealed or granted (standard patent) | ||
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |