EP0776470A1 - Process and device for monitoring the tightness of pipelines, in particular sewage pipeline systems - Google Patents
Process and device for monitoring the tightness of pipelines, in particular sewage pipeline systemsInfo
- Publication number
- EP0776470A1 EP0776470A1 EP95930463A EP95930463A EP0776470A1 EP 0776470 A1 EP0776470 A1 EP 0776470A1 EP 95930463 A EP95930463 A EP 95930463A EP 95930463 A EP95930463 A EP 95930463A EP 0776470 A1 EP0776470 A1 EP 0776470A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- control channels
- test medium
- tubular openings
- pipeline
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
- F16L9/19—Multi-channel pipes or pipe assemblies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/283—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes for double-walled pipes
Definitions
- the invention relates to a method for monitoring the tightness of pipes, in particular sewage systems, and a device for performing the method.
- Stoneware for sewerage purposes is standardized in DIN 1230, for example in the publication of the January 1986 edition.
- sewage piping systems are increasingly being installed within water protection areas. Special care must be taken to ensure that no waste water escapes from the pipes and shafts and makes the groundwater dirty and unusable. The damage to the environment can be considerable.
- the load capacity of the pipe is also designed to be higher than is actually necessary. Particularly thick pipes are therefore used.
- the pipes intended for use in drinking water protection areas should be checked for leaks.
- the check is carried out optically, for example after digging up the soil in a predetermined section. If there is a leak in a pipeline, the faulty location is also identified by digging up the soil along the pipeline. It is also known to double wall pipes to be used in order to be able to compensate for a leak in the inner pipe through the pipe arranged around it.
- Pipes made of stoneware are mostly used because they deliver particularly good results even in the short or long-term, sometimes extreme chemical, physical, often thermal, or biological loads.
- Stoneware is rigid, dimensionally stable and corrosion-resistant and is not attacked by any substance contained in sewage, groundwater or soil, except for hydrofluoric acid.
- the invention has for its object to provide an improved method for monitoring the tightness of pipes, in particular sewage systems, and an apparatus for performing the method.
- the interconnected control channels or tubular openings create a closed pressure chamber for the entire piping system, which also includes the sealing areas.
- the control channels or tubular openings are filled with a test medium under a static pressure. This can be a gas or a liquid. Means for measuring the pressure are assigned to the control channels or tubular openings.
- a leak in the area of a sleeve or the wall of the pipeline is determined by a drop in the pressure of the test medium between two measuring points. Even the removal of damage can be done without digging up the soil by means of a backfill material entered into the continuous control channels with the test medium. This combines at the leakage point with the escaping substance, for example waste water, to form a putty layer, which accumulates at the leakage point.
- the pipes are single-walled and made of stoneware, concrete or any other material. Double-walled pipes can also be used. However, these are much more expensive and offer hardly any advantages with this method.
- the control channels usually have a diameter of less than 10 mm, in particular 3 mm. They are either made of glass and are inserted into the wall of the pipeline in its longitudinal direction during the manufacturing process (casting) of the pipelines. Or they are made of a flexible material as a tube-like tube and can be removed from the wall after the pipeline has dried. However, they can also be provided during the casting process by a solid core, for example made of metal with a Teflon coating. This is then pulled out of the pipe wall again under vibration and / or turning according to the principle of a broach.
- the wall of the control channel is additionally compressed.
- Tubular openings then remain in the wall of the pipeline instead of the control channels.
- One or more, for example four, such control channels or tubular openings are distributed over the cross section of the pipeline.
- larger diameter control channels can also be used.
- a double-walled pipeline can be produced in such a way that webs or the like are inserted between the outer wall and the inner wall. This then creates evenly distributed chambers in the cross-sectional view of the pipeline, which serve as control channels.
- the control channels like the individual pipelines, are connected at their ends to other control channels of the following pipeline. As a result, they form a closed space. At a starting point, this space of the control channels is acted upon by a pump or a compressor with a test medium under static pressure, a gas or a liquid. As a result, the resulting control channel space is constantly under a predetermined excess pressure in relation to the environment and is therefore referred to below as the pressure space.
- the test medium can be compressed air, a gas, water or a liquid with special properties. It can form a leak-sealing or sealing compound with waste water or in any case not react chemically and / or explosively with it. Before the gas reaches the control channels from the pump, it is passed over a measuring section.
- the pressure in front of and behind the nozzle is determined. Ideally, the pressure behind the nozzle does not change without leakage in the piping system, in reality only slightly.
- a second nozzle can be connected in parallel to the first.
- Various measuring points are provided along the piping system.
- means for measuring the pressure for example pressure measuring devices or pressure sensors, take up the respective pressure prevailing in the control channels. If the pressure between two measuring points changes more than permitted in a real system, then a leak must have occurred between the two measuring points. The rough location allows this statement. A fine location gives the exact position of the leakage point from a calculation taking into account the pressure drop over the length of the pipeline.
- Fig.l a schematic sketch of a first
- Embodiment of a device for monitoring the tightness of pipeline systems Embodiment of a device for monitoring the tightness of pipeline systems
- Fig.2 a pressure curve diagram in the application of the
- FIG.3 a side sectional view of a second
- Embodiment of a device for monitoring the tightness of pipeline systems Embodiment of a device for monitoring the tightness of pipeline systems
- Fig.6 a side sectional view of a shaft with pipes and pipes going out in three different directions
- a schematic diagram of a first embodiment of a device for monitoring the tightness of pipes 1a, 1b is shown.
- the pipelines 1a, 1b indicated by dashed lines are shown in half section of their outer walls 2a, 2b.
- One or more control channels 3 are arranged within these outer walls 2a, 2b. These are provided distributed over the cross section of the pipes 1a, 1b.
- a control channel 3 is shown in each case.
- the two pipelines 1a, 1b are shown in the area of an annular socket connector 40.
- the socket connector 40 connects the pipes la and lb and the control channels 3a and 3b.
- the control channel 3c is provided within the socket connector 40.
- the control channels 3a, 3b and 3c are arranged at the same height. Between the socket connector 40 and the two walls 2a, 2b of the pipelines 1a, 1b there is a gap 5 within a gap 5 which is formed there when the parts are joined together Sealing 6, for example seals or foaming or the like, is
- the control channels 3 are filled from the side of the control channel 3a with a test medium 7 which is under a prescribable pressure and shown here in dotted lines. So that the test medium 7 can be filled into a closed space, the control channels 3 at the end of the pipelines 1, here the line 1b, are closed or provided with a defined small passage in order to obtain a controlled passage measurement.
- the start of the control channels 3, here the control channel 3a, is connected to a feed line 8.
- the test medium 7 is introduced in a compressed form into the control channels 3 or into the space formed by the closed control channels 3 by means of a pump P or a compressor connected to the control channels 3 through the feed line 8.
- the room is referred to below as the pressure room.
- the static pressure that the pump P generates for the test medium is relatively low.
- the pump can therefore be designed with a small design and for a low output.
- the pressure of the test medium 7 in the control channels 3 is greater than the pressure of the waste water in the interior 16 of the pipeline 1. This prevents waste water from entering the control channels in the event of a leak and clogging them. Compressed air or another gas or liquid medium is used as the test medium 7, which forms a sealing compound with any escaping waste water and immediately seals the leak again.
- the pressure drop is measurable.
- means 10 for measuring the pressure for example pressure measuring devices or, are in front of and behind the nozzle 9 Pressure transducer, provided.
- the pressure sensor P ⁇ determines the pressure in front of the nozzle or measuring section 9 and the pressure sensor P 2 behind it.
- the pressure that is established behind the nozzle 9 is the initial value A. Under this pressure, the test medium is fed into the pressure chamber of the control channels 3.
- a second nozzle 12 can be connected in parallel to the first nozzle 9.
- a valve 13 is switched into the feed path of the second nozzle 12.
- the second nozzle 12 can optionally be activated.
- a further means 10 for measuring the pressure is arranged at the end of the pipeline 2b. For example, it is provided in a measuring point M. It determines the final value E of the pressure there.
- FIG. 2 shows a pressure curve diagram plotting the pressure p over the length 1 of the pipelines la, lb, the feed line 8 and the measuring section 9.
- a curve is for an initial value AI of the test medium pressure with the nozzle 9 active, another curve for an initial value A2 of the test medium pressure with the nozzle 12 active is shown.
- the pressure drop over the entire length of the pressure chamber of the control channels 3a and 3b and the feed line 8 is plotted over their total length.
- the test medium in the control channels 3 is under a constant pressure. In the idle state, the pressure at all points in the pipelines la, lb is essentially the same. The top horizontal line thus indicates the idle state Rideal of the entire pressure chamber.
- the static pressure of the test medium 7 in the control channels 3 is completely constant and corresponds to the pressure of the pump P. ideally sealed pipeline l and ideally sealed path from pump P to measuring point I 4 . This pressure is called the maximum.
- the dotted line under it are the real hibernation R real on -
- the losses without leakage point 11 occurs along the path from the pump to the measuring point I 4 are taken into account via the pipelines.
- the pressure in the control channels 3 then also drops slightly over their length and is no longer constant.
- the pressure changes from the value pi to the value P 2 due to a test medium volume removal - depending on the nozzle 9 and / or 12 switched on, the pressure drop is less or greater.
- the pressure then prevailing at point 12 is the already mentioned initial value AI or A2 at the start of the control channel 3a.
- the other curve is in the dense state at the initial value AI said history Rideal, i m real little lossy condition the course Rreal "Be i to an initial value A2 set to the curves Rideal and R real parallel curves R'ideal and R 'real on.
- a pressure drop Rreal or R'real also arises if, for test purposes, the pressure space of the control channels 3 at the end E is not closed, but instead is provided with a defined opening for generating a low minimum flow. A permanent passage control is then created through the defined opening.
- a leakage point 11 appears in the course of the pipes 1a, 1b or the sleeve 4, the test medium escapes there.
- the leakage point 11 is indicated in Fig.l in the area of the sleeve 4.
- the reason for this could be a leak in the seal 6. If the reason for this is that the outer wall 2a, 2b of the pipelines la, lb is broken or damaged, the control channels 3a, 3b or tubular openings arranged in the wall collapse with the pipelines la, lb. So there is a pressure drop at the leakage point, because that Test medium escapes. However, this value cannot be directly determined with regard to its value, since the exact leak point is initially unknown.
- the pressure sensor P 3 is therefore shown in dash-dot lines.
- the leakage point 11 can initially only be roughly concluded. Fine location requires another measurement or calculation. In this way, a leakage point 11 can thus be determined without digging up the pipes 2 or acoustically checking for hissing noises occurring along the pipes or in the area of their connecting sleeves 4.
- the two values P2 and P 4 are connected to one another by a straight line 14.
- the slope of the curve is a measure of the internal resistance of the pipes from the initial value A2.
- the rough location therefore means that the pressure of the leakage point on the straight line 14 between the point I2 and the point I 4 is to be arranged. If the leak happens to be exactly at location I 4 , the fine location is very easy. At this point I 4 the pressure is then minimal and essentially maintains this value at a next measuring point.
- the test medium volume statically present in the control channels 3 can be calculated on the basis of the purapen power and the volume of the control channels 3, that is to say of the available pressure space.
- the gas volume flows out of it as a volume flow. If a sufficiently large leak 11 is assumed, the volume flow flowing out of the leak is passed through the maximum pump power and the distance 9 acting as the internal resistance of the test medium source are limited.
- the pressure P 4 ' is measured.
- the resistance of the control channels is relatively large and can be determined. The resulting volume flow can also be determined.
- the resistance of the leak point is very small. From the pressure drop, which can be determined by pressure sensors in the measuring points, in connection with the resistance of the control channels and the volume flow, the point on the pipeline at which the leakage occurred can be determined. This is because the pressure is proportional to the product of the volume of the test medium in the pressure space of the control channels and the feed line and the frictional resistance of the section of the control channels and feed line. According to the Hagen-Poiseuille law, the flowing quantity Q or the strength of the volume flow is proportional to the product of radius R or area of the control channels 3 to the four and the difference between two pressures, here P2 ⁇ P4 'and inversely proportional to the product of the Length I 3 to the leak and a friction constant. The frictional resistance of the entire route from control channels 3 and supply line 8 can be determined in a preliminary test and the friction constant can be calculated from this. The length I 3 is then obtained by changing the formula:
- the quantity Q results from the measurements for the measuring section 9.
- the line 15 indicates the ideal, loss-free pressure curve between the leakage point 11 and the point I 4 , without a further pressure drop.
- Line 15a indicates the course with pressure drop (lossy) between the two points 11 and I 4 . Because the difference in the Pressure values is low, the measured pressure P 4 'can be assumed as the ideal value for calculating the length I 3 . According to the diagram in FIG. 2, the small pressure difference between ideal and real value P 4 'is not decisive for locating the leakage point 11.
- the leak 11 If the leak 11 is sufficiently large, the entire test medium volume, that is to say the volume flow, leaves the control channels 3 at the leak point. At the next measuring point there is hardly any test medium volume available. In this case, the pressure of the test medium is almost zero. Even when using small compressors or pumps, there may be quiet hissing noises or even sounds when the test medium emerges from the small openings. If there is a leak, the pump increases its output until it reaches its maximum value. It tries to generate and maintain the set pressure for the test medium. The quiet noises would continue without further ado.
- FIG. 3 shows a side sectional view of a second embodiment of a device for monitoring the tightness of pipeline systems.
- a sleeve 4b is pushed over the appropriately designed end of the second pipeline 1a.
- the seals 6a and 6b arranged in the gap 5 between the sleeve 4b and the end of the outer wall 2a of the pipeline 1a are arranged in such a way that they are directed outwards to the environment and inwards to the pipe interior 16 seal.
- the test medium 7 provided in the control channels 3a, 3b spreads radially in the gap 5 between the two seals 6a, 6b.
- the control channels 3a, 3b are open towards the gap.
- the gap 5 is therefore part of the pressure space of the control channels 3a, 3b.
- the leakage point is located as described in the previous figures.
- the measuring points can be provided in the area of every, every second, third or multiple sleeve 4.
- a lead-out measuring point can be arranged either at both ends of the pipeline or in between. It is sufficient to arrange a suitable means for measuring the pressure. This should be able to be queried from a central station. The monitoring of the sleeves 4 and the outer walls 2 of the pipes 1 then takes place continuously. The individual measuring points along the pipelines can be queried on a display panel in the central control room. The results can be evaluated using a computer and an alarm can be triggered in the event of a pressure drop.
- the sealing of a leakage point 11 can be done as with tubeless tires.
- a corresponding agent is supplied to the test medium 7 by the pump P, which remains when the leakage point 11 flows past it. For example, it reacts with the medium escaping from the leak, for example waste water, or with moisture from the ground on the outer wall.
- the pressure of the wastewater is lower than that of the test medium to prevent wastewater from leaking into the thin Control channels 3 arrives and clogs or clogs them.
- the pipeline la has the outer wall 2a and an inner wall 17. Insulating material or the like can be provided between the two walls 2a, 17. This protects the inner tube against the higher loads acting on the outer tube.
- the control channels 3a are sensibly arranged in the outer wall 2a which is under a greater load, for example due to the soil surrounding it and possible temperature fluctuations.
- control channels are made of a thermally resilient, fragile or brittle material that breaks down with the stoneware
- control channels can also be inserted as flexible hose-like control channels in the moist material when casting a pipe. After drying, they can then be removed from the hard tube by pulling them out. There are tubular openings. In the event of cracks in the wall of the tube, these release the test medium even faster than glass control channels.
- the control channels 3 can be arranged in a pipeline 1 with a round cross-section, but also in a pipeline 1 with a square cross-section, as in FIG.
- more than three control channels or tubular openings can optionally be used be provided.
- the required number can be determined empirically or specified. In any case, care must be taken to ensure that, in the event of a leak in a wall of the pipeline, at least one of the control channels or a tubular opening provided there also breaks and leaves the test medium free so that the leak can be located. If too few control channels 3a are arranged, a leak can occur without the pressure in the control channels decreasing or the test medium volume being reduced.
- FIG. 5 shows a cross-sectional view of a further embodiment of a pipeline 1b. It has an essentially round cross section with four corners 18, 19, 20, 21.
- the control channels 3b ⁇ , 3b2,3b 3 , 3b4 are arranged in these corners 18, 19, 20, 21.
- material reinforcements are provided in this embodiment along the longitudinal extent of the pipelines 1b in the region of the control channels or tubular openings. This results in the essentially round pipeline 1b with corners 18, 19, 20, 21, seen from the outside.
- a weakening of the outer wall 2b of the pipeline 1b can prepare an undesired leakage point 11.
- FIG. 6 shows a side sectional view of a shaft 22, from which pipes la, lb, lc branch off in three different directions.
- Four control channels 3a, 3b, 3c are provided in each of the three pipelines. These are interconnected, as are the pipes la, lb, lc.
- the pressure transducer 10 arranged on a wall 23 of the shaft 22 below a removable cover 25 is through hoses or thin tubes 24 connected to the control channels 3a, 3b, 3c.
- the pressure transducer 10 can be connected to a central control room or computer by cable or by radio transmission.
- the control channels 3a, 3b, 3c are also disconnected.
- the hoses or thin tubes 24 connected to the control channels 3a, 3b, 3c can then lead to three different pressure transducers 10, not shown.
- three pumps P are provided to provide the test medium volume and its static pressure.
- the manholes that are frequently encountered with wastewater are only specially shaped walls for the medium to be transported.
- control chambers 26 are provided.
- the dimensions of the chambers 26 are exaggerated for clarity. In reality, they will be smaller in size.
- six such control segment shaped control chambers 26a to 26f are provided.
- the view thus looks like a wagon wheel with an outer and an inner ring and spokes arranged between them.
- the spokes are walls 27a to 27f between the individual chambers 26.
- the outer ring is the outer wall 2 of the pipeline 1.
- the inner ring is the actual pipeline, which here is an inner wall 28 delimiting the pipe interior 16.
- the mode of operation of the control chambers 26 is the same as that of the control channels 3 or tubular openings.
- the cross-section flowed through is only larger than this. If there is a leak in the outer wall 2 of the pipeline 1, the test medium 7 flows exactly as in the control channels 3 or tubular openings to the outside and indicates the leak due to the resulting pressure drop.
- control chambers 26 can be manufactured, for example, by inserting and / or pushing correspondingly shaped molded parts into the still moist tube, which the chambers 26 produce in the previously thick outer wall 2.
- control channels 3 or control chambers 26 can already be used during the assembly of the pipelines, namely directly after joining two pipes together by means of a sleeve. The sleeve seal must then be checked to ensure that the pipeline is sealed from the start.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Examining Or Testing Airtightness (AREA)
- Sewage (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4431367 | 1994-08-27 | ||
DE4431367A DE4431367C2 (en) | 1994-08-27 | 1994-08-27 | Method for monitoring the tightness of pipelines, in particular sewage systems, and a device for carrying out the method |
PCT/EP1995/003238 WO1996007089A1 (en) | 1994-08-27 | 1995-08-16 | Process and device for monitoring the tightness of pipelines, in particular sewage pipeline systems |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0776470A1 true EP0776470A1 (en) | 1997-06-04 |
Family
ID=6527308
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95930463A Pending EP0776470A1 (en) | 1994-08-27 | 1995-08-16 | Process and device for monitoring the tightness of pipelines, in particular sewage pipeline systems |
Country Status (11)
Country | Link |
---|---|
US (1) | US5817926A (en) |
EP (1) | EP0776470A1 (en) |
JP (1) | JPH10504901A (en) |
KR (1) | KR970705746A (en) |
AU (1) | AU3384195A (en) |
CA (1) | CA2200360A1 (en) |
CZ (1) | CZ58097A3 (en) |
DE (2) | DE4431367C2 (en) |
FI (1) | FI970804A (en) |
SK (1) | SK26497A3 (en) |
WO (1) | WO1996007089A1 (en) |
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US6305427B1 (en) | 1999-11-19 | 2001-10-23 | Kenway Corporation | Double walled apparatus and methods |
DE10044144B4 (en) * | 2000-09-06 | 2006-04-13 | Klenk Gmbh | Connecting device for connecting a fluid line with a second connection device |
DE202007016602U1 (en) * | 2007-11-28 | 2009-04-02 | Gebr. Fasel Betonwerk Gmbh | Duct system with testing device |
US9068681B1 (en) * | 2013-01-02 | 2015-06-30 | Paul S. Lyman | Pipe having an embedded detectable element |
WO2015066229A2 (en) * | 2013-10-30 | 2015-05-07 | Alphinity, Llc | Fluid monitoring device with disposable inner liner with sensor integration |
FR3064744B1 (en) * | 2017-03-31 | 2020-11-06 | Saint Gobain Pont A Mousson | TIGHTNESS CHECKING DEVICE, TUBULAR JUNCTION AND CORRESPONDING USE |
DE102017207587A1 (en) * | 2017-05-05 | 2018-11-08 | Steinzeug-Keramo GmbH | Use of a buried pipe with longitudinal wall channels |
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US5172730A (en) * | 1989-07-03 | 1992-12-22 | Insituform Of North American, Inc. | Two-wall leakage detection system for a pipe |
US5072622A (en) * | 1990-06-04 | 1991-12-17 | Roach Max J | Pipeline monitoring and leak containment system and apparatus therefor |
DE4039863C1 (en) * | 1990-12-13 | 1992-02-13 | Bayer Ag, 5090 Leverkusen, De | Insulated double pipe - has nested pipes with foaming heat insulation in between, plus leakage sensor line below inner pipe, screened from insulation by cover film |
US5546992A (en) * | 1994-01-18 | 1996-08-20 | Insituform (Netherlands) B.V. | Dual containment pipe rehabilitation system |
-
1994
- 1994-08-27 DE DE4431367A patent/DE4431367C2/en not_active Expired - Fee Related
-
1995
- 1995-08-16 JP JP8508448A patent/JPH10504901A/en active Pending
- 1995-08-16 WO PCT/EP1995/003238 patent/WO1996007089A1/en not_active Application Discontinuation
- 1995-08-16 CZ CZ97580A patent/CZ58097A3/en unknown
- 1995-08-16 SK SK264-97A patent/SK26497A3/en unknown
- 1995-08-16 DE DE29521615U patent/DE29521615U1/en not_active Expired - Lifetime
- 1995-08-16 AU AU33841/95A patent/AU3384195A/en not_active Abandoned
- 1995-08-16 CA CA002200360A patent/CA2200360A1/en not_active Abandoned
- 1995-08-16 KR KR1019970701263A patent/KR970705746A/en not_active Application Discontinuation
- 1995-08-16 EP EP95930463A patent/EP0776470A1/en active Pending
- 1995-08-16 US US08/793,522 patent/US5817926A/en not_active Expired - Fee Related
-
1997
- 1997-02-26 FI FI970804A patent/FI970804A/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO9607089A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1996007089A1 (en) | 1996-03-07 |
DE4431367A1 (en) | 1996-02-29 |
FI970804A (en) | 1997-04-25 |
US5817926A (en) | 1998-10-06 |
DE29521615U1 (en) | 1997-10-30 |
CZ58097A3 (en) | 1997-09-17 |
KR970705746A (en) | 1997-10-09 |
JPH10504901A (en) | 1998-05-12 |
CA2200360A1 (en) | 1996-03-07 |
AU3384195A (en) | 1996-03-22 |
FI970804A0 (en) | 1997-02-26 |
DE4431367C2 (en) | 2000-11-30 |
SK26497A3 (en) | 1998-04-08 |
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