DE4211038A1 - Leak testing system for pipes - has generator for producing pressure difference between inside and outside of pipe and microphones for detecting noises typical of leaks inside pipe and correction microphones outside. - Google Patents
Leak testing system for pipes - has generator for producing pressure difference between inside and outside of pipe and microphones for detecting noises typical of leaks inside pipe and correction microphones outside.Info
- Publication number
- DE4211038A1 DE4211038A1 DE19924211038 DE4211038A DE4211038A1 DE 4211038 A1 DE4211038 A1 DE 4211038A1 DE 19924211038 DE19924211038 DE 19924211038 DE 4211038 A DE4211038 A DE 4211038A DE 4211038 A1 DE4211038 A1 DE 4211038A1
- Authority
- DE
- Germany
- Prior art keywords
- microphones
- pipe
- outside
- pipes
- pressure difference
- 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.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
Description
Die Erfindung betrifft eine Vorrichtung zum Prüfen der Dichtheit von Rohren, insbesondere aus Beton oder Steinzeug. Bekannt sind Prüfeinrichtungen, welche nach Erzeugen von Überdruck oder Unterdruck im Rohr die Druckveränderung messen, um daraus auf die Dichtheit des Rohres zu schließen.The invention relates to a device for checking the tightness of pipes, in particular of concrete or stoneware. Known are test facilities which, after generating excess pressure or Vacuum in the pipe measure the change in pressure to determine the Close tightness of the pipe.
Der entscheidende Nachteil dieses Prüfverfahrens ist, daß die Druckänderung nicht nur von der Menge der entweichenden Luft abhängt, sondern auch, besonders zu Anfang der Meßzeit, von der Temperatur der Luft. Diese nähert sich erst nach verhältnismäßig langer Beruhigungszeit, entlang einer e-Funktion, einem stabilen Wert.The decisive disadvantage of this test procedure is that the Pressure change not only from the amount of air escaping depends, but also, especially at the beginning of the measuring time, on the Temperature of the air. This only approaches proportionally long settling time, along an e-function, a stable one Value.
Bei einer Messung mit Unterdruck, also einem Teil-Vakuum, kommt noch der Einfluß des gesättigten Wasserdampfes und entsprechenden Nebelbildung hinzu. Dasselbe Rohr kann bei unterschiedlicher Wetterlage und Luftfeuchtigkeit unterschiedliche Meßergebnisse liefern.When measuring with negative pressure, i.e. a partial vacuum, comes nor the influence of saturated water vapor and the like Fog formation. The same pipe can be used in different Weather conditions and humidity different measurement results deliver.
Ein weiterer Nachteil ergibt sich insbesondere bei Rohren mit großem Durchmesser und entsprechend großem Volumen dadurch, daß die Menge der durch feine Risse oder Poren ausströmenden Luft im Verhältnis zur Gesamtmenge gering ist und bei absoluter Messung des Luftdruckes kaum erfassbar ist.Another disadvantage arises in particular with pipes large diameter and correspondingly large volume in that the amount of air flowing out through fine cracks or pores is small in relation to the total amount and with absolute measurement the barometric pressure is barely detectable.
Entsprechend der Erfindung wird das Problem auf ganz anderem Wege dadurch gelöst, daß im Inneren des Rohres Mikrofone angebracht sind. Leckstellen werden dadurch gemeldet und quantifiziert, daß das zuge hörige typische zischende Geräusch erfaßt und ausgewertet wird. Durch Vergleich der von den verschiedenen Mikrofonen aufgenommenen Lautstärken kann sogar eine grobe Lokalisierung der undichten Stellen erfolgen.According to the invention, the problem is solved in a completely different way solved in that microphones are attached inside the tube. Leaks are reported and quantified by the fact that the hearing typical hissing sound is detected and evaluated. By comparing those recorded by the different microphones Volume levels can even be a rough localization of the leaks Places.
Fig. 1 zeigt den typischen Aufbau einer Meßvorrichtung nach der Erfindung. Im Rahmen 1 sind Anpreßarme 2 horizontal beweglich gelagert, wodurch Dichtplatten 3 auf die Stirnseiten der Rohre angedrückt werden. Im Falle der Vakuum-Prüfung saugen sich die Dichtplatten ohne zusätzliche äußere Kräfte fest. Fig. 1 shows the typical structure of a measuring device according to the invention. In the frame 1 pressure arms 2 are mounted horizontally movable, whereby sealing plates 3 are pressed onto the end faces of the tubes. In the case of a vacuum test, the sealing plates are sucked in without additional external forces.
Die Pumpe 4 erzeugt über Schlauch 5 die erforderliche Druckdifferenz. Nach Beendigung des Pumpvorganges setzt die eigentliche Dichtheitsmessung ein. Die inneren Mikrofone 6 und 7 nehmen bei mehr oder weniger undichten Rohren die Zischgeräusche auf. Ein weiteres Mikrofon 8 kann außen angebracht sein um gegebenenfalls störende Geräusche der Außenwelt durch Gegensteuerung unschädlich zu machen. The pump 4 generates the required pressure difference via hose 5 . After the pumping process is complete, the actual leak measurement starts. The inner microphones 6 and 7 pick up the hissing noises when the pipes are more or less leaky. Another microphone 8 can be attached on the outside in order to make any disturbing noises of the outside world harmless by countermeasures.
Die Zischgeräusche, deren Frequenz erfahrungsgemäß etwa zwischen 4000 und 6000 Herz liegt, können aber auch durch handelsübliche Frequenzfilter von unerwünschten Nebengeräuschen getrennt werden. Die ganze bekannte Technik der Frequenz-Analyse steht der Auswertung der von den Mikrofonen gelieferten Geräusche zur Verfügung, um die undichten Stellen zu lokalisieren, zu quantifizieren und für eine spätere Sanierung zu registrieren.The hissing noises, the experience of which is about between 4000 and 6000 heart lies, but can also be obtained through commercially available Frequency filter of unwanted noise be separated. All the known technique of frequency analysis stands for the evaluation of the noise delivered by the microphones available to locate the leaks, too quantify and register for later renovation.
Bei entsprechender Computer-Auswertung der Meßergebnisse kann mit bekannten Methoden eine Zwischenspeicherung erfolgen. Zur späteren Nachbehandlung und Sanierung der Rohre stehen diese Informationen dann auf einem Bildschirm oder Plotter zur Verfügung.With appropriate computer evaluation of the measurement results can Buffering is carried out using known methods. Stand for later post-treatment and rehabilitation of the pipes this information then on a screen or plotter to disposal.
Eine Beruhigungszeit zum Ausgleich der Temperatur und der ent sprechenden Druckänderungen ist nicht erforderlich. Sofort nach Beendigung des Pumpvorganges genügt eine verhältnismäßig kurze Meßzeit.A calming time to balance the temperature and the ent speaking pressure changes is not necessary. Immediately after A comparatively short termination of the pumping process is sufficient Measuring time.
Claims (1)
- - im Innern des Rohres angebrachte Mikrofone 6 und 7, welche die bei Undichtheiten typischen zischenden Geräusche erfassen und zur Auswertung einer Analyse nach Lautstärke, Frequenz und Ortsbestimmung liefern,
- - ein außen angebrachtes Mikrofon 8, welches nach Bedarf störende Außengeräusche erfaßt und zur Korrektur der Innen-Mikrofone dienen kann
- - Richtmikrofone oder auf einer beweglichen Lanze im Inneren des Rohres angebrachte Mikrofone, welche eine exaktere Lokalisierung der Leckstellen gewährleisten.
- - microphones 6 and 7 attached inside the tube, which record the hissing noises typical of leaks and deliver them for evaluation of an analysis according to volume, frequency and location,
- - An externally attached microphone 8 , which detects disturbing external noise as needed and can be used to correct the internal microphones
- - Directional microphones or microphones mounted on a movable lance inside the tube, which ensure a more precise localization of the leak points.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19924211038 DE4211038A1 (en) | 1992-04-02 | 1992-04-02 | Leak testing system for pipes - has generator for producing pressure difference between inside and outside of pipe and microphones for detecting noises typical of leaks inside pipe and correction microphones outside. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19924211038 DE4211038A1 (en) | 1992-04-02 | 1992-04-02 | Leak testing system for pipes - has generator for producing pressure difference between inside and outside of pipe and microphones for detecting noises typical of leaks inside pipe and correction microphones outside. |
Publications (1)
Publication Number | Publication Date |
---|---|
DE4211038A1 true DE4211038A1 (en) | 1993-10-07 |
Family
ID=6455868
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19924211038 Withdrawn DE4211038A1 (en) | 1992-04-02 | 1992-04-02 | Leak testing system for pipes - has generator for producing pressure difference between inside and outside of pipe and microphones for detecting noises typical of leaks inside pipe and correction microphones outside. |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE4211038A1 (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003036289A2 (en) * | 2001-10-25 | 2003-05-01 | Dürr Ecoclean GmbH | Method and device for controlling work pieces |
DE10316902A1 (en) * | 2003-04-12 | 2004-11-11 | Forschungszentrum Jülich GmbH | Device for quick vacuum control |
US7810378B2 (en) | 2007-06-21 | 2010-10-12 | National Research Council Of Canada | Monitoring of leakage in wastewater force mains and other pipes carrying fluid under pressure |
US9528903B2 (en) | 2014-10-01 | 2016-12-27 | Mueller International, Llc | Piezoelectric vibration sensor for fluid leak detection |
US9593999B2 (en) | 2011-08-12 | 2017-03-14 | Mueller International, Llc | Enclosure for leak detector |
US9849322B2 (en) | 2010-06-16 | 2017-12-26 | Mueller International, Llc | Infrastructure monitoring devices, systems, and methods |
US9939344B2 (en) | 2012-10-26 | 2018-04-10 | Mueller International, Llc | Detecting leaks in a fluid distribution system |
US10283857B2 (en) | 2016-02-12 | 2019-05-07 | Mueller International, Llc | Nozzle cap multi-band antenna assembly |
US10305178B2 (en) | 2016-02-12 | 2019-05-28 | Mueller International, Llc | Nozzle cap multi-band antenna assembly |
US10539480B2 (en) | 2017-10-27 | 2020-01-21 | Mueller International, Llc | Frequency sub-band leak detection |
US10859462B2 (en) | 2018-09-04 | 2020-12-08 | Mueller International, Llc | Hydrant cap leak detector with oriented sensor |
US11342656B2 (en) | 2018-12-28 | 2022-05-24 | Mueller International, Llc | Nozzle cap encapsulated antenna system |
US11542690B2 (en) | 2020-05-14 | 2023-01-03 | Mueller International, Llc | Hydrant nozzle cap adapter |
US11624674B2 (en) | 2019-05-31 | 2023-04-11 | Mueller International, Llc | Hydrant nozzle cap with antenna |
-
1992
- 1992-04-02 DE DE19924211038 patent/DE4211038A1/en not_active Withdrawn
Cited By (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003036289A3 (en) * | 2001-10-25 | 2004-03-04 | Duerr Ecoclean Gmbh | Method and device for controlling work pieces |
WO2003036289A2 (en) * | 2001-10-25 | 2003-05-01 | Dürr Ecoclean GmbH | Method and device for controlling work pieces |
DE10316902A1 (en) * | 2003-04-12 | 2004-11-11 | Forschungszentrum Jülich GmbH | Device for quick vacuum control |
US7810378B2 (en) | 2007-06-21 | 2010-10-12 | National Research Council Of Canada | Monitoring of leakage in wastewater force mains and other pipes carrying fluid under pressure |
US10881888B2 (en) | 2010-06-16 | 2021-01-05 | Mueller International, Llc | Infrastructure monitoring devices, systems, and methods |
US10857403B2 (en) | 2010-06-16 | 2020-12-08 | Mueller International, Llc | Infrastructure monitoring devices, systems, and methods |
US11590376B2 (en) | 2010-06-16 | 2023-02-28 | Mueller International, Llc | Infrastructure monitoring devices, systems, and methods |
US9849322B2 (en) | 2010-06-16 | 2017-12-26 | Mueller International, Llc | Infrastructure monitoring devices, systems, and methods |
US9861848B2 (en) | 2010-06-16 | 2018-01-09 | Mueller International, Llc | Infrastructure monitoring devices, systems, and methods |
US11630021B2 (en) | 2011-08-12 | 2023-04-18 | Mueller International, Llc | Enclosure for leak detector |
US10175135B2 (en) | 2011-08-12 | 2019-01-08 | Mueller International, Llc | Leak detector |
US11680865B2 (en) | 2011-08-12 | 2023-06-20 | Mueller International, Llc | Leak detection in water distribution systems using acoustic signals |
US10386257B2 (en) | 2011-08-12 | 2019-08-20 | Mueller International, Llc | Enclosure for leak detector |
US9772250B2 (en) | 2011-08-12 | 2017-09-26 | Mueller International, Llc | Leak detector and sensor |
US9593999B2 (en) | 2011-08-12 | 2017-03-14 | Mueller International, Llc | Enclosure for leak detector |
US9939344B2 (en) | 2012-10-26 | 2018-04-10 | Mueller International, Llc | Detecting leaks in a fluid distribution system |
US9528903B2 (en) | 2014-10-01 | 2016-12-27 | Mueller International, Llc | Piezoelectric vibration sensor for fluid leak detection |
US11469494B2 (en) | 2016-02-12 | 2022-10-11 | Mueller International, Llc | Nozzle cap multi-band antenna assembly |
US11336004B2 (en) | 2016-02-12 | 2022-05-17 | Mueller International, Llc | Nozzle cap multi-band antenna assembly |
US11837782B2 (en) | 2016-02-12 | 2023-12-05 | Mueller International, Llc | Nozzle cap assembly |
US10283857B2 (en) | 2016-02-12 | 2019-05-07 | Mueller International, Llc | Nozzle cap multi-band antenna assembly |
US11652284B2 (en) | 2016-02-12 | 2023-05-16 | Mueller International, Llc | Nozzle cap assembly |
US11527821B2 (en) | 2016-02-12 | 2022-12-13 | Mueller International, Llc | Nozzle cap assembly |
US10305178B2 (en) | 2016-02-12 | 2019-05-28 | Mueller International, Llc | Nozzle cap multi-band antenna assembly |
US10539480B2 (en) | 2017-10-27 | 2020-01-21 | Mueller International, Llc | Frequency sub-band leak detection |
US10859462B2 (en) | 2018-09-04 | 2020-12-08 | Mueller International, Llc | Hydrant cap leak detector with oriented sensor |
US11422054B2 (en) | 2018-09-04 | 2022-08-23 | Mueller International, Llc | Hydrant cap leak detector with oriented sensor |
US11692901B2 (en) | 2018-09-04 | 2023-07-04 | Mueller International, Llc | Hydrant cap leak detector with oriented sensor |
US11342656B2 (en) | 2018-12-28 | 2022-05-24 | Mueller International, Llc | Nozzle cap encapsulated antenna system |
US11624674B2 (en) | 2019-05-31 | 2023-04-11 | Mueller International, Llc | Hydrant nozzle cap with antenna |
US11542690B2 (en) | 2020-05-14 | 2023-01-03 | Mueller International, Llc | Hydrant nozzle cap adapter |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8139 | Disposal/non-payment of the annual fee |