WO1998025122A1 - Procede et systeme de detection de fuites - Google Patents

Procede et systeme de detection de fuites Download PDF

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Publication number
WO1998025122A1
WO1998025122A1 PCT/US1997/022357 US9722357W WO9825122A1 WO 1998025122 A1 WO1998025122 A1 WO 1998025122A1 US 9722357 W US9722357 W US 9722357W WO 9825122 A1 WO9825122 A1 WO 9825122A1
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WO
WIPO (PCT)
Prior art keywords
pressure
interstitial space
slope
volume
predetermined
Prior art date
Application number
PCT/US1997/022357
Other languages
English (en)
Inventor
Robert O. Homes
Original Assignee
Bell Avon, Inc.
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 Bell Avon, Inc. filed Critical Bell Avon, Inc.
Publication of WO1998025122A1 publication Critical patent/WO1998025122A1/fr

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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
    • G01M3/02—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

Definitions

  • This invention relates to large, multiple-walled fluid storage tanks, and more particularly to a system and method of detecting leaks in multiple-walled fluid storage tanks.
  • the invention relates to a system and method for determining in real time and with a high degree of accuracy the condition of liquid storage tanks that are surrounded by or lined with a fluid-tight envelope with a small interstitial space between the envelope and tank.
  • the invention relates to a sealing arrangement at the manhole opening of a liquid storage tank having an inner flexible liner such that a manhole cover can be removed for gaining access inside the liner without disturbing the seal between the liner and tank.
  • U.S. Patent No. 5,184,504 to Spring discloses a system and method for detecting leakage from a tank that is surrounded by or lined with a fluid-tight envelope with a small interstitial space between the envelope and tank.
  • a high-vacuum system is used to withdraw liquid from the interstitial space and determine if a leak has occurred when the high- vacuum system is operated for periods of greater frequency and/or longer duration than would be predicted.
  • evacuated volumes are measured and volumes greater than predicted serve as an indication that a leak has occurred.
  • a low- vacuum system is also employed to maintain a negative pressure in the interstitial space and to provide an indication of leakage when the low- vacuum system operates at a greater frequency and/or for periods of greater duration than predicted.
  • leak detection occurs only after a predetermined frequency is detected in the high and/or low- vacuum systems or when the volume of liquid in the interstitial space reaches a predetermined volume.
  • a method for determining leakage in a fluid holding tank having first and second concentric containers with a relatively fixed interstitial space between the first and second containers includes the steps of: reducing the pressure in the interstitial space to a first predetermined level; reiteratively measuring the pressure in the interstitial space over a first predetermined time period to obtain a first measured pressure decay slope; comparing the measured pressure decay slope with a first predetermined slope; and generating a warning signal when the pressure decay slope is greater than the first predetermined slope.
  • the method according to the invention further includes comparing the measured pressure decay slope with a second predetermined slope and generating a warning signal when the measured pressure decay slope is greater than the second predetermined slope.
  • the first predetermined slope is less than the second predetermined slope. If the measured pressure decay slope is less than the second predetermined slope, the pressure in the interstitial space is reiteratively measured over a second predetermined time period to obtain a second measured pressure decay slope. The second measured pressure decay slope is then compared with the first predetermined slope and a warning signal is generated if the second measured pressure decay slope is greater than the first predetermined slope.
  • the second predetermined time period is shorter than the first predetermined time period.
  • the first predetermined slope is obtained by first determining the volume of the interstitial space; then applying a reduced pressure to the interstitial space while the tank is filled with air; and measuring any change in pressure over time due to unavoidable system leakage including permeation of air through the inner container and/or outer container.
  • the volume V, of the interstitial space is determined by measuring a first pressure P, in the interstitial space; connecting a known volume of gas V 2 at a known pressure P 2 with the interstitial space; measuring the pressure P 3 of the combined volume V, and V 2 of gas and calculating the volume V, of the interstitial space in accordance with the formula: ⁇ V 2 - P 2 - P 3 - V 2 )
  • V wherein P, is the initial pressure of a volume of gas in the interstitial space, V 2 is the known second volume of gas connected to the interstitial space, P 2 is the pressure of the known second volume of gas before injecting into the interstitial space, P 3 is the pressure of the first and second volume of gas in the interstitial space and V, is the volume of gas in the interstitial space.
  • the inner tank is a flexible membrane which forms a liner for the outer tank.
  • the vacuum is sufficient to draw the flexible membrane tightly against the inner surface of the outer tank which is preferably a rigid tank made, for example, of steel.
  • a fluid containment and leak detection system comprises an outer tank and an inner tank, preferably a flexible bladder, of complementary configuration to the outer tank positioned within the outer tank and adjacent the inner surface of the outer tank such that an interstitial space is formed between the inner and outer tanks.
  • a vacuum source having a vacuum line is fluidly connected to the interstitial space for periodically reducing the pressure in the interstitial space.
  • a pressure transducer is coupled to the interstitial space for measuring the amount of pressure in the interstitial space and for generating electrical signals proportional to the measured amount of pressure.
  • a controller is operatively connected to the pressure transducer for receiving the electrical signals therefrom for computing a pressure decay slope in response to reiterative electrical signals from the pressure transducer and for generating a warning signal when the pressure decay slope thus computed is greater than a predetermined slope.
  • a fluid containment system comprises a rigid outer tank with at least one access opening and a wall surrounding the opening.
  • An inner flexible bladder is complementary in configuration to the rigid outer tank and is positioned within the outer tank such that an interstitial space is formed between the inner bladder and outer tank.
  • the bladder includes an opening in alignment with the tank opening and a flexible flange portion surrounding the bladder opening.
  • a first annular member has an outer surface in sealing engagement with an interior surface of the wall and an inner surface adapted for sealing engagement with an outer surface of the flexible flange portion.
  • a second annular member is sized to be received within the first annular member and has an outer surface adapted for sealing engagement with an inner surface of the flexible flange portion such that the flange portion is sandwiched between the first and second annular members to thereby form a seal between the outer tank and inner bladder and isolate the interstitial space from atmosphere.
  • the second annular member has a central opening coincident with the access opening for communication with an interior of the bladder. In this manner, a tank cover can be removed from the outer tank opening without disturbing the seal between the outer tank and inner bladder.
  • the inner surface of the first annular member and the outer surface of the. second annular member slope inwardly toward a center of the access opening.
  • One or more grooves are formed in the inner surface of the first annular member and an O-ring is located within each groove. A portion of the O-ring extends outwardly of the groove and into sealing contact with the flexible flange.
  • a method of monitoring a relatively fixed interstitial space between multiple-walled storage tanks comprising an inner tank and an outer tank wherein the change in volume within the interstitial layer is reiteratively measured and compared to determine whether a leak has occurred in either of the inner or outer tanks.
  • the inner tank is filled with a liquid and the interstitial space is sealed from the atmosphere.
  • the pressure of the volume of gas in the interstitial space is measured.
  • the interstitial space is then connected with a known second volume of gas at a known pressure. While the interstitial space is connected to the known volume of gas, the pressure of the first and second volume of gas in the interstitial space is measured.
  • the volume of the gas in the interstitial space is then computed and stored. These same steps are repeated reiteratively to determine subsequent readings for the volume of gas in the interstitial space. The subsequent readings are compared to determine whether a leak has occurred in the interstitial space. Desirably, the change in volume over a particular period of time is measured and compared with a predetermined rate of volume decrease. If the measured rate of decrease of the volume exceeds a predetermined rate, an alarm sounds.
  • FIG. 1 is a cross-sectional view of a multiple-walled storage tank and a leak detection system according to the present invention
  • FIG. 2 is an enlarged cross-sectional exploded view of an upper portion of the multiple-walled storage tank of FIG. 1 showing a liner sealing assembly according to the invention
  • FIG. 3 is an enlarged cross-sectional view of a portion of the liner sealing assembly of FIG. 2 in its assembled position;
  • FIG. 4 is an operational logic diagram for initializing the leak-detection system when first placed into operation
  • FIG. 5 is a flow diagram of a method for determining whether a leak has occurred.
  • FIG. 6 is a flow diagram of a method for monitoring the interstitial space between a multiple-walled storage tank according to another embodiment of the invention.
  • An external storage tank 12 is typically located underground and is used to hold corrosive or volatile liquid materials, such as gasoline or diesel oil.
  • the external storage tank 12 can alternatively be located above the ground, and can be used to store fluids of various types.
  • the external tank 12 is constructed of a rigid material such as metal, fiberglass or synthetic resin.
  • the tank 12 includes a manhole 14 with an annular wall 54 (FIG. 2) and a manhole cover 20 that normally closes a manhole opening 16.
  • the manhole cover 20 is typical in construction and may include one or more through-holes and fittings (not shown) for connection to a liquid retrieving mechanism, such as a gasoline pump. When the cover 20 is removed, the interior of the tank is accessible from outside the tank.
  • the external tank 12 is preferably a cylindrical tank having flat ends 22. However, the external tank 12 may be spherical or of any other shape.
  • a flexible liner or inner tank 24 which, in its operative position, is complementary in configuration to the internal surface of the external tank 12.
  • the liner is preferably constructed with an embossed or roughened outer surface which creates an interstitial space or volume 26 when the embossed or roughened surface is in contact with the inner wall of the outer tank 12. This type of liner is well known in the art and therefore will not be described in greater detail.
  • a vacuum system includes a vacuum line 28 with a free end 29 that is positioned between the outer rigid tank 12 and the inner liner 24 in the interstitial space 26 and extends from a bottom 30 of the tank 12 to a top 32 thereof.
  • the vacuum line 28 is connected to a liquid/vapor separator 34 which is in turn connected to a vacuum source 36 through a second vacuum line 38.
  • a vent line 35 with a valve 37 is connected to the separator 34 to maintain the separator at atmospheric pressure.
  • a return line 40 extends from the liquid/vapor separator 34 to the manhole cover 20 to thereby form a fluid path between the liquid/vapor separator 34 and the interior of the liner.
  • a manually operated valve 31 is positioned in the first vacuum line 28 adjacent to the tank 12.
  • a normally closed valve 42 is also positioned in the first vacuum line 28 between the liquid/vapor separator 34 and the valve 31 to automatically seal the interstitial layer from the vacuum source 36 when the vacuum source is not operating.
  • the valve 42 automatically opens and valve 37 automatically closes and a low pressure vacuum is created in the interstitial volume 26 to thereby press the liner 24 against the inner wall of the outer tank 12.
  • Any liquid that may be present in the interstitial layer 26 due to leakage or natural permeation through the flexible liner 24 tends to migrate during normal operation of the leak detection system to the separator 34 where it is separated from the air and is returned under gravity to the tank interior through return line 40.
  • a valve 43 and pump can be provided in the return line 40 to maintain a pressure differential between the liquid/vapor separator 34 and the interior of the liner 24.
  • the valve 42 When the valve 42 is open, the valve 43 is closed. Likewise, when the valve 42 is closed, the valve 43 is open. This construction isolates the vacuum in the interstitial layer from the separator 34 and the inner volume 18 during normal operation.
  • a pressure transducer 44 is connected directly to the interstitial layer through a conduit to detect the pressure in the interstitial layer and to generate a signal representative thereof.
  • the pressure transducer 44 is electrically connected to a controller 46 that has a microprocessor (not shown) and an optional display 48 through control line 47.
  • valves 42, 43 and 37 are also connected to the microprocessor through lines 45 and 47, respectively, in order to control opening and closing of the valves.
  • An electrical line 50 connects the vacuum source 36, which is preferably a vacuum pump, to the microprocessor for controlling operation of the vacuum source 36 in a manner to be described in greater detail below.
  • the inner liner 24 has an opening 52 defined by a liner flange 53 that is coincident with the opening 16 in the outer tank 12.
  • An annular ring 56 has an outer surface 59 that is shaped to conform to the shape of the inner surface 58 of the annular wall 54. Preferably, the outer surface 59 is sealed to the inner surface 58 through welding or other well-known fastening techniques.
  • An inner surface 60 of the annular ring 56 extends at an acute angle with respect to the outer surface 59, tapering downwardly and inwardly.
  • Two axially spaced grooves 62 are formed in and extend circumferentially around the inner surface 60.
  • An O-ring 64 is positioned in each groove 62 and sealingly contacts the liner flange 53 when in the assembled positioned as shown in FIG. 3.
  • An annular sealing ring 66 includes an outer surface 68 that extends at an acute angle with respect to an inner surface 70, tapering downwardly and inwardly in complementary relationship with the inner surface 60 of the annular ring 56.
  • the acute angle between the surfaces 68, 70 is substantially equal to the acute angle between the surfaces 59, 60 such that the outer surface 68 of the sealing ring 66 is complementary to the inner surface 60 of the annular ring 56.
  • the ring 66 is press-fit into the inner liner opening 52 and against the liner flange 53 to thereby seal the interstitial space from atmosphere even when the manhole cover 20 (FIG. 1) is removed.
  • the interstitial space 26 is only open to the vacuum line 28. This configuration maintains the sealed integrity of pressure in the interstitial space 26 completely independent of the manhole cover position. Any leak alters the pressure in the interstitial space which is detected by the pressure transducer 44.
  • FIG. 4 initialization of the tank system 10 will now be described.
  • the various components of the system described in FIGS. 1 - 3 are delivered to the installation site and assembled into an operational condition.
  • the liner 24 is isolated from the rest of the system by closing the manual valve 31 , as represented by block 101.
  • the lines 28, 38 and 40 are then evacuated to a negative pressure as represented by block 102.
  • the lines are evacuated to approximately 1 Ton * absolute.
  • the pressure change with time is then monitored in the lines with the pressure transducer 44 and the microprocessor in the controller 46 as represented by block 104.
  • the pressure change within the lines is greater than a preset limit, as represented by block 106, there may be a possible leak in the system or a faulty transducer.
  • the problem is then corrected, which may include resealing the connections in the pressure lines or replacing faulty equipment as represented by block 108.
  • the lines are again evacuated to a negative pressure as represented by block 102 and the process continues.
  • the microprocessor indicates that the lines are properly sealed and ready for operation.
  • the manual valve 31 is subsequently opened, as represented by block 112, to thereby open the liner 24 to the system.
  • the interstitial volume (I.V.) between the liner and the inner wall of the tank 12 must be determined, as represented by block 116, in order to properly measure if any leakage is occurring.
  • the interstitial volume must be determined for each installation since tolerance variations in the liner and tank, the type of material used for the liner and the pattern on the outer surface of the liner all contribute to variations in the interstitial volume.
  • the volume of the interstitial space can be determined by first measuring the pressure P, of a volume V ! of gas in the interstitial layer and then connecting to the interstitial layer a volume V 2 of gas at a known pressure P 2 different than P,. The pressure P 3 of the combined pressures is then measured.
  • the volume V, of the gas in the interstitial layer is determined as follows:
  • the weighted average pressure can be expressed by the following equation:
  • V Interstitial Space Volume (unknown)
  • V 2 Injected Volume (known)
  • P, Interstitial Pressure (measured/known)
  • P 2 Injected Pressure (known)
  • P 3 New Pressure Observed
  • the interstitial space 26 is again evacuated to the predetermined vacuum pressure, as represented by block 118.
  • the pressure in the interstitial volume is then monitored over time in block 120. If the change in pressure over a predetermined time is greater than a preset limit in block 124, there exists the possibility that the liner or tank is defective or the connections between the liner, tank, valves, or vacuum lines are not adequately sealed.
  • the preset limit is approximately 7.3 x 10 " 3 Torr hour ⁇ ft 2 for an interstitial volume of about 25 liters. This limit can vary greatly depending on the volume of the interstitial space 26, the size of the vacuum lines, material properties of the components, etc.
  • the problem is corrected in block 126 and the interstitial space 26 is again evacuated in block 118 to the predetermined vacuum pressure. If it is determined in block 128 that the change in pressure over the predetermined time is less than the preset limit, the system 10 can then be placed in normal operation as represented by block 129.
  • the system is initially started manually, as represented by block 130, by throwing an appropriate starter switch (not shown) on the controller 46.
  • the microprocessor first determines if there is an appropriate vacuum in the interstitial space 26 based on one or more pressure readings measured by the transducer 44. If the pressure is not within a predetermined range, the vacuum pump 36 is actuated and controlled by the microprocessor to evacuate the interstitial space 26 to a predetermined negative pressure, after which the pump 36 is turned off.
  • This pressure will decay over time due to temperature changes (which are usually negligible if the tank 12 is located underground), changes in the total iiquid volume or in the hydrostatic head of the liquid in the tank, the rate of allowable slow leakage through joints and seals, permeation of fluid through the liner frorri the inner volume 18, and even gaseous leakage through the ligid skin of the external tauk 12 as a result of the inherent porosity of certain metals, such as steel.
  • the low-pressure decay over time due to the above-described changes is minor, however, in comparison to the low- pressure loss caused by a major leak.
  • the rate of permissible leakage or slope of pressure loss versus time curve is reflected by the rate of low pressure decay in the interstitial volume 26, which can be predetermined through testing of the system 10. Any sustained deviation in the predetermined rate of pressure decay is indicative of an unacceptable leak in the system.
  • Such deviations are monitored by the microprocessor through readings from the pressure transducer 44 taken at predetermined intervals. Preferably, a pressure reading is recorded in five minute intervals and a total of 20 data points, as represented by "y" in block 132, taken at the five-minute intervals are collected and stored in a memory associated with the microprocessor. The microprocessor then calculates an average slope or rate of pressure decay based on the 20 data points.
  • the average calculated slope from the pressure data points is compared to a predetermined set point to determine if the measured slope is greater than the predetermined slope. If not, the microprocessor determines that no leakage has occurred and subsequent pressure data points are obtained in block 132. This process forms a sliding window of 20 data points wherein a new data point is added to the data base and the earliest data point is eliminated. A new average slope is then calculated. Thus, a rate of pressure decay can be calculated and compared to the predetermined rate in real time.
  • the average decay slope is greater than the predetermined limit (x), e.g., approximately 7.3 x 10 "3 Torr/hour ft 2 for an interstitial volume of about 25 liters, but less than a second predetermined limit (z) at block 1 35, e.g. approximately 1 T ⁇ /minute for an interstitial volume of about 25 liters
  • a second predetermined limit (z) at block 1 35 e.g. approximately 1 T ⁇ /minute for an interstitial volume of about 25 liters
  • anc ⁇ er set of data points are gathered at block 136 and a new average slope is calculated.
  • the number of data points gathered at block 136 is half of the data points that are present in the data window, as represented by "1/2 Y" in block 136.
  • the cycle starts over again at block 132 and a new average slope is calculated. However, if the average slope is again measured to be greater than the predetermined slope (x) at block 138, an alarm signal is generated at block 140.
  • the alarm signal can actuate a visual display, an audio signal, or a combination of both to indicate that a leak has developed in the system.
  • the leakage detection system is preferably shut down, i.e. electrical power is cut off from the vacuum pump and valves.
  • the alarm signal is generated in block 135 and sent to the alarm at block 140.
  • the leakage detection system is then immediately shut down.
  • the limits (x) and (z) are given by way of example only and can change significantly based on the actual interstitial volume, the size of the vacuum lines, material properties of the components, etc.
  • the predetermined slopes are based on a leak-free tank. In the preferred embodiment as described above, approximately 18 hours pass between successive actuation of the vacuum pump due to acceptable low-pressure losses as previously described.
  • the system of the present invention has several high- performance features.
  • Very minute leaks above the predetermined acceptable leak rate can be detected on a continuous or real-time basis, depending on the frequency of pressure measurement in the interstitial space. With pressure decay slope measurement and comparison, the leak rate can be determined with a high degree of accuracy. Thus, very minute leaks above the acceptable predetermined limit can be detected and action taken to repair the leak prior to the development of a major leak and possible subsequent environmental contamination.
  • Another method for monitoring the interstitial space for leaks is by using the weighted average pressure and monitoring the volume in the interstitial space.
  • the volume of gas in the interstitial layer is determined by the formula set forth above.
  • the interstitial volume can be monitored for changes over a period of time. If the rate of change of volume exceeds a predetermined limit, an alarm sounds and the system is shut down to check for leaks.
  • the same averaging techniques as described above with respect to pressure monitoring can be used to determine when a leak occurs.
  • This volume measuring system is illustrated in the flow diagram of FIG. 6 to which reference is now made.
  • the system is initialized as shown in the block 142 and the pressure in the interstitial layer is measured as represented in block 144.
  • the pressure change over a period of time is then determined as represented in block 146. If the change in pressure is above a predetermined pressure decay rate, then the system is examined for a potential problem or the system is allowed to stabilize as represented in blocks 148 and 150.
  • the steps of blocks 144 and 146 are then repeated until the pressure decay is less than the predetermined value which, for example, can be 1.0 Torr/minute for certain storage tanks.
  • a known volume of gas (air) at a known pressure is then injected into the interstitial layer as represented in block 152.
  • the known pressure of the volume of injected gas is generally different than the pressure in the interstitial layer. It can be greater or less than the existing pressure in the interstitial layer.
  • the new pressure in the interstitial space is then measured as represented in block 154. If the pressure change is less than a predetermined limit, for example, 5 Torr, then anothei volume of gas in connected to the interstitial layer at a different pressure or different volume or both, as represented in block 160 and the interstitial layer pressure is then measured again as represented in block 154. If the change in pressure over time is greater than the predetermined pressure change, then the interstitial volume is calculated as represented in block 158 in accordance with the formula set forth above.
  • This process is carried out at least 3 times and the calculated values are averaged to arrive at a reliable value of the interstitial volume. This process is carried out on a periodic basis, for example, every hour, every 12 hours.
  • the calculated volume is then compared to the previous volume calculation to determine whether a leak has occurred.
  • the volume calculated is the volume of gas in the interstitial space. To the extent that liquid fills the interstitial space, the volume of the space will decrease. To the extent that gas enters the interstitial space, the pressure in the space will increase and thus tend to indicate a smaller interstitial gas volume, also indicating a possible leak
  • the volume monitoring technique is especially useful in relatively large above-ground tanks in which the interstitial volume tends to be large and temperature changes tend to be significant.
  • the monitoring system of the invention can be used to detect leaks in above-ground as well as below-ground tanks.
  • the invention can be used to monitor leaks in tanks with an external flexible bladder and internal rigid tank as well as an internal flexible bladder and external rigid tank.
  • the monitoring system of the invention can be used to monitor leaks in an interstitial space between two rigid tanks.

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Abstract

La présente invention concerne un système un procédé de confinement de fluide et de détection de fuite. Ce système comporte une enveloppe extérieure rigide (12), dans laquelle est montée une vessie intérieure souple (24), à l'intérieur de l'enveloppe extérieure (12) et contre la surface intérieure de l'enveloppe extérieure (12), de façon à créer un vide interstitiel (26) entre la vessie intérieure (24) et l'enveloppe extérieure (12). Une source de dépression (36) dont une ligne de dépression (28) est fluidiquement raccordée au vide interstitiel (26) de façon à appliquer périodiquement dans le vide interstitiel une dépression tendant à attirer la vessie intérieure (24) vers la surface intérieure de l'enveloppe extérieure (12). Un transducteur manométrique (44) équipe l'enveloppe extérieure (22) de façon à mesurer le niveau de pression du vide interstitiel et à générer des signaux électriques proportionnels au niveau de pression mesuré. Un régulateur (46) est fonctionnellement raccordé au transducteur manométrique (44) pour en recevoir les signaux électriques de façon à calculer une pente de décroissance de pression en réaction à des signaux électriques récursifs du transducteur manométrique (44), et de façon à produire un signal d'avertissement lorsque la pente de décroissance de pression ainsi calculée est plus grande qu'une pente de référence. Deux bagues annulaires (56, 66) montées en entonnoir saisissent la vessie intérieur (24) au niveau d'un trou d'homme (16) de façon à maintenir l'étanchéité entre l'enveloppe extérieure (12) et la vessie intérieure (24) lorsque le regard de trou d'homme (20) est ouvert.
PCT/US1997/022357 1996-12-05 1997-12-05 Procede et systeme de detection de fuites WO1998025122A1 (fr)

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Cited By (10)

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Publication number Priority date Publication date Assignee Title
AU770383B2 (en) * 2000-06-28 2004-02-19 Bae Systems Plc Detection of fluid leak sites in fluid containers
WO2006131312A1 (fr) * 2005-06-10 2006-12-14 Testo Ag Procede de determination du debit de fuite total de systemes a alimenter en pression et armature de commande permettant la mise en oeuvre de ce procede
WO2008036360A3 (fr) * 2006-09-19 2008-07-03 Kci Licensing Inc Système et procédé pour déterminer l'état de remplissage d'un réservoir de fluide dans un système de traitement à dépression
US7758555B2 (en) 2006-09-19 2010-07-20 Kci Licensing, Inc. Reduced pressure treatment system having blockage clearing and dual-zone pressure protection capabilities
US7927319B2 (en) 2007-02-20 2011-04-19 Kci Licensing, Inc. System and method for distinguishing leaks from a disengaged canister condition in a reduced pressure treatment system
AT506777B1 (de) * 2008-04-30 2011-07-15 Wolftank Systems Ag Leckwarnanlage für doppelwandige fluidleitungen oder tanks
US8366691B2 (en) 2008-08-08 2013-02-05 Kci Licensing, Inc Reduced-pressure treatment systems with reservoir control
US8409170B2 (en) 2007-02-09 2013-04-02 Kci Licensing, Inc. System and method for managing reduced pressure at a tissue site
WO2014009732A1 (fr) * 2012-07-11 2014-01-16 Gah (Refrigeration Products) Limited Système et procédé de détection de fuite de réfrigérant
US11229732B2 (en) 2006-09-19 2022-01-25 Kci Licensing, Inc. System and method for locating fluid leaks at a drape of a reduced pressure delivery system

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Publication number Priority date Publication date Assignee Title
US4796676A (en) * 1987-06-05 1989-01-10 Hendershot John A Fluid storage tank system
US5184504A (en) * 1990-05-30 1993-02-09 Spring G Everett Leak detection
DE4218890A1 (de) * 1991-08-16 1993-12-16 Walter Nicolai Leckanzeiger mit Speicherprogammierbarer Steuerung für doppelwandige Behälter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4796676A (en) * 1987-06-05 1989-01-10 Hendershot John A Fluid storage tank system
US5184504A (en) * 1990-05-30 1993-02-09 Spring G Everett Leak detection
DE4218890A1 (de) * 1991-08-16 1993-12-16 Walter Nicolai Leckanzeiger mit Speicherprogammierbarer Steuerung für doppelwandige Behälter

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU770383B2 (en) * 2000-06-28 2004-02-19 Bae Systems Plc Detection of fluid leak sites in fluid containers
US7899629B2 (en) 2005-06-10 2011-03-01 Testo Ag Method for determining the total leak rate of systems impinged upon by pressure, and control apparatus for carrying out said method
WO2006131312A1 (fr) * 2005-06-10 2006-12-14 Testo Ag Procede de determination du debit de fuite total de systemes a alimenter en pression et armature de commande permettant la mise en oeuvre de ce procede
US11229732B2 (en) 2006-09-19 2022-01-25 Kci Licensing, Inc. System and method for locating fluid leaks at a drape of a reduced pressure delivery system
US7758555B2 (en) 2006-09-19 2010-07-20 Kci Licensing, Inc. Reduced pressure treatment system having blockage clearing and dual-zone pressure protection capabilities
EP2063826A2 (fr) * 2006-09-19 2009-06-03 KCI Licensing, Inc. Système et procédé pour déterminer l'état de remplissage d'un réservoir de fluide dans un système de traitement à dépression
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