System method and device for leak detection and localization in a pipe network

• US 8,665,101 B2
• Filed: 07/06/2010
• Issued: 03/04/2014
• Est. Priority Date: 11/16/2009
• Status: Active Grant

• Current Assignee: Aquarius Spectrum Ltd. (Aliaxis SA)
• Original Assignee: Aquarius Spectrum Ltd. (Aliaxis SA)
• Inventors: Solomon, David
• Primary Examiner(s): Lee, Benjamin C
• Assistant Examiner(s): PHAM, QUANG
• Application Number:
  US12/830,920
• Publication Number:
  US 20120007743A1
• Time in Patent Office: 1,337 Days
• Field of Search: 340/605, 702/51, 702/54, 702/56, 73/40, 731/525.8
• US Class Current: 340/605
• CPC Class Codes: G01F 1/66 by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
• CPC Class Codes: G01M 3/24 using infrasonic, sonic, or ultrasonic vibrations
• CPC Class Codes: G01M 3/243 for pipes
• CPC Class Codes: G01M 3/2807 for pipes G01M3/2892, G01M3/30 take precedence
• CPC Class Codes: G01N 29/14 using acoustic emission techniques echo of particles G01N29/046; measuring mechanical vibrations or acoustic waves in solids in general G01H1/00

Abstract

The invention provides a system for leak detection of a fluid in a pipe network. The system includes flow meters, and vibration detectors adapted to be attached to a pipe at a location in the pipe network. A processor analyzes signals generated by the flow meters and vibration detectors to identify the presence of one or more leaks in the pipe network. The invention also provides a method for detecting and localizing leaks in a pipeline network, and a device comprising a flow meter integral with a vibration detector for use in the system of the invention.

Claims

1. A system for leak detection of a fluid in a pipeline network, comprising:

a plurality of flow meters integrated with vibration sensors deployed at two or more locations in the pipeline network, each said flow meter integrated with said vibration sensor comprising;

a wet chamber comprising the flow meter, the flow meter configured to generate a flow signal indicative of the fluid flow through the wet chamber;

a dry chamber comprising a piezo membrane as a vibration sensor placed at the bottom of the dry chamber, wherein the piezo membrane is configured to generate a vibration signal, that is calibrated with vibrations in the piezo membrane, caused by the fluid flow;

an interface separating the wet chamber from the dry chamber comprising an acoustically coupling material configured to conduct vibrations from the wet chamber, caused by a leak in the pipeline network and introduced by the fluid flow through the wet chamber, to the dry chamber and to the piezo membrane of the dry chamber;

wherein the acoustically coupling material is compressible to allow attachment of the dry chamber to the wet chamber;

a processor configured to receive and process the signals generated by the flow meter and the piezo membrane; and

a transceiver configured to transmit and receive the signals to at least one remote processing unit; and

the at least one remote processing unit configured to receive the flow signals and the vibration signals from each of the plurality of flow meters integrated with the vibration sensors, and perform an artifact detection and rejection algorithm for reducing vibration measurement artifacts due to noise generated by water consumption flow rather than leakage to detect and localize leaks in the pipeline network based on said flow signals and said vibration signals during leak detection.

2. The system for leak detection according to claim 1, wherein the interface separating the wet chamber from the dry chamber comprising a shape of a truncated cone and wherein a space between the wet chamber and the dry chamber contains the acoustically coupling material.

3. The system for leak detection according to claim 1, wherein the flow meter of the plurality of flow meters integrated with the vibration sensors are at least one of a vane and an ultrasound transducer.

4. The system for leak detection according to claim 1, wherein the piezo membrane has an annular shape and surrounds a magnetic drive.

5. The system for leak detection according to claim 1, wherein the processor of the flow meter integrated with vibration sensor is configured to detect malfunction in the flow meter integrated with the vibration sensor based on a flow rate of the flow meter and vibrations generated in the piezo membrane.

6. A method of detecting leaks using the system for detecting leaks according to claim 1, the method comprising:

substantially simultaneously generating the vibration signals and the flow signals by the flow meters integrated with the vibrations sensors;

transmitting the vibration signals and the flow signals from each of the transceivers of the flow meters integrated with the vibration sensors to the at least one remote processing unit;

monitoring the vibration signals generated by the flow meters integrated with the vibration sensors, using the at least one remote processing unit;

analyzing the vibration signals to determine whether any of the vibration signals are indicative of exceptional vibration signals in the pipeline network; and

when the exceptional vibration signals are detected,

simultaneously monitoring the vibration signals and the flow signals generated by the flow meters integrated with the vibration sensors; and

determining whether there are any significant flow rates based on the flow signals in the pipeline network in a location where the exceptional vibration signals are detected to introduce the artifact detection and rejection algorithm for reducing vibration measurement artifacts due to noise generated by water consumption flow rather than leakage, into a leak detection and location algorithm using the flow signals generated by the flow meter integrated with the vibration sensor; and

if no significant flows are detected in the pipeline, executing the leak detection and location algorithm based on the vibration signals to locate leaks in the pipeline; and

issuing an alert after a leak has been located in the pipeline.

7. The method according to claim 6, wherein the exceptional vibration is a vibration whose amplitude or power exceeds a predetermined threshold, or the vibration whose amplitude or power has increased over a recent time period by a predetermined factor.

8. The method according to claim 6, wherein the vibration signals are monitored periodically.

9. The method according to claim 6, wherein the leak detection and location algorithm comprises calculation of a cross-spectrum or correlation of pairs of signals and identifying an optimal filter corresponding to maxima of coherence of the two signals.