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
Grant status
Application
Patent type
Prior art keywords
microphones
pipe
inside
noises
outside
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Withdrawn
Application number
DE19924211038
Other languages
German (de)
Inventor
Karl Dipl Ing Rekers
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fa Dipl-Ing Karl Rekers Maschinenbau 48480 Spelle De
KARL REKERS MASCHINENBAU FA DI
Original Assignee
Fa Dipl-Ing Karl Rekers Maschinenbau 48480 Spelle De
KARL REKERS MASCHINENBAU FA DI
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

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR
    • G01M3/00Investigating fluid-tightness of structures
    • G01M3/02Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/24Investigating 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

Abstract

The system produces a pressure difference inside the pipe wrt. the outside. Microphones (6,7) inside the pipe detect noises typical of leaks which are analysed for loudness, frequency and position. An external microphone (8) detects external noises for correction purposes. Directional microphones, or microphones mounted on a lance, can be used to ensure accurate location of leakage points. USE/ADVANTAGE - Esp. for testing concrete or stoneware pipes. Overcomes e.g. long settling times and lack of sensitivity.

Description

Die Erfindung betrifft eine Vorrichtung zum Prüfen der Dichtheit von Rohren, insbesondere aus Beton oder Steinzeug. The invention relates to a device for testing the tightness of tubes, in particular of concrete or stoneware. Bekannt sind Prüfeinrichtungen, welche nach Erzeugen von Überdruck oder Unterdruck im Rohr die Druckveränderung messen, um daraus auf die Dichtheit des Rohres zu schließen. are known testing devices that measure the pressure change by generating pressure or negative pressure in the tube to close it on the 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. The main disadvantage of this test method, that the pressure change depends not only on the amount of escaping air but also, especially at the beginning of the measurement period, the temperature of the air. Diese nähert sich erst nach verhältnismäßig langer Beruhigungszeit, entlang einer e-Funktion, einem stabilen Wert. These approaches only after a relatively long settling time along an exponential function, a stable value.

Bei einer Messung mit Unterdruck, also einem Teil-Vakuum, kommt noch der Einfluß des gesättigten Wasserdampfes und entsprechenden Nebelbildung hinzu. In a measurement with negative pressure, so a partial vacuum, nor the influence of saturated steam and corresponding mist formation is added. Dasselbe Rohr kann bei unterschiedlicher Wetterlage und Luftfeuchtigkeit unterschiedliche Meßergebnisse liefern. The same tube can provide different results when different weather conditions and humidity.

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. A further disadvantage arises in particular when large diameter pipes and a correspondingly large volume characterized in that the amount of the air flowing through fissures or pores in relation to total air amount is small and is barely detectable in an absolute measurement of the air pressure.

Entsprechend der Erfindung wird das Problem auf ganz anderem Wege dadurch gelöst, daß im Inneren des Rohres Mikrofone angebracht sind. According to the invention the problem is solved in a completely different way in that microphones are attached to the inside of the tube. Leckstellen werden dadurch gemeldet und quantifiziert, daß das zuge hörige typische zischende Geräusch erfaßt und ausgewertet wird. Leaks are reported characterized and quantified that the applied hearing typical hissing noise is detected and evaluated. Durch Vergleich der von den verschiedenen Mikrofonen aufgenommenen Lautstärken kann sogar eine grobe Lokalisierung der undichten Stellen erfolgen. By comparing the images taken by the different microphones volumes even a rough localization of leaks can occur.

Fig. 1 zeigt den typischen Aufbau einer Meßvorrichtung nach der Erfindung. Fig. 1 shows the typical structure of a measuring apparatus according to the invention. Im Rahmen 1 sind Anpreßarme 2 horizontal beweglich gelagert, wodurch Dichtplatten 3 auf die Stirnseiten der Rohre angedrückt werden. In the frame 1 Anpreßarme 2 are mounted horizontally movable, thereby sealing plates 3 are pressed onto the end sides of the tubes. Im Falle der Vakuum-Prüfung saugen sich die Dichtplatten ohne zusätzliche äußere Kräfte fest. In the case of the vacuum test, the sealing plates suck firmly without additional external forces.

Die Pumpe 4 erzeugt über Schlauch 5 die erforderliche Druckdifferenz. The pump 4 provides the required pressure differential across tube. 5 Nach Beendigung des Pumpvorganges setzt die eigentliche Dichtheitsmessung ein. After stoppage of pumping the actual tightness test begins. Die inneren Mikrofone 6 und 7 nehmen bei mehr oder weniger undichten Rohren die Zischgeräusche auf. The inner microphones 6 and 7 refer to the hissing noises at more or less leaky pipes. Ein weiteres Mikrofon 8 kann außen angebracht sein um gegebenenfalls störende Geräusche der Außenwelt durch Gegensteuerung unschädlich zu machen. A further microphone 8 may be attached on the outside to make optionally harmless disturbing noises to the outside world through countermeasures.

Die Zischgeräusche, deren Frequenz erfahrungsgemäß etwa zwischen 4000 und 6000 Herz liegt, können aber auch durch handelsübliche Frequenzfilter von unerwünschten Nebengeräuschen getrennt werden. The hissing noises whose frequency is according to experience approximately 4000 to 6000 heart, but can also be separated by a standard frequency filter of unwanted noise. 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. All the known technique of frequency analysis is the evaluation of the noise transmitted by the microphone is available to locate the leaks to quantify and register for future redevelopment.

Bei entsprechender Computer-Auswertung der Meßergebnisse kann mit bekannten Methoden eine Zwischenspeicherung erfolgen. With appropriate computer evaluation of results with known methods caches can be done. Zur späteren Nachbehandlung und Sanierung der Rohre stehen diese Informationen dann auf einem Bildschirm oder Plotter zur Verfügung. For subsequent post-treatment and rehabilitation of pipes that information then available on a screen or plotter available.

Eine Beruhigungszeit zum Ausgleich der Temperatur und der ent sprechenden Druckänderungen ist nicht erforderlich. A settling time to compensate for the temperature and pressure changes ent speaking is not required. Sofort nach Beendigung des Pumpvorganges genügt eine verhältnismäßig kurze Meßzeit. Immediately after stoppage of pumping enough a relatively short measurement time.

Claims (1)

  1. Vorrichtung zum Prüfen der Dichtheit von Rohren, insbesondere aus Beton oder Steinzeug, wobei mit bekannten Mitteln im Innern des Rohres eine Druckdifferenz gegenüber der Außenwelt erzeugt wird, gekennzeichnet durch Device for testing the tightness of tubes, in particular of concrete or stoneware, wherein a pressure differential relative to the outside world is created by known means in the interior of the tube, characterized by
    • - 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, - mounted inside the tube microphones 6 and 7, which detect the typical case of leakage hissing noise and provide for the analysis of an analysis on the volume, frequency, and location determination,
    • - ein außen angebrachtes Mikrofon 8 , welches nach Bedarf störende Außengeräusche erfaßt und zur Korrektur der Innen-Mikrofone dienen kann - an externally mounted microphone 8 which detects unwanted background noise as needed and used to correct the internal microphones can
    • - Richtmikrofone oder auf einer beweglichen Lanze im Inneren des Rohres angebrachte Mikrofone, welche eine exaktere Lokalisierung der Leckstellen gewährleisten. - directional microphones or mounted on a movable lance inside the tube microphones, which ensure a more precise localization of leaks.
DE19924211038 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. Withdrawn DE4211038A1 (en)

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 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 (7)

* Cited by examiner, † Cited by third party
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 fast 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

Cited By (10)

* Cited by examiner, † Cited by third party
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
WO2003036289A3 (en) * 2001-10-25 2004-03-04 Duerr Ecoclean Gmbh Method and device for controlling work pieces
DE10316902A1 (en) * 2003-04-12 2004-11-11 Forschungszentrum Jülich GmbH Device for fast 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
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
US9593999B2 (en) 2011-08-12 2017-03-14 Mueller International, Llc Enclosure for leak detector
US9772250B2 (en) 2011-08-12 2017-09-26 Mueller International, Llc Leak detector and sensor
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

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