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| Number | Title | Issue Date |
| 6567006 | Monitoring vibrations in a pipeline network The invention relates to acoustic detection of leaks in a pipeline using locally-intelligent, data-adaptive monitors deployed for a period of time. Monitors are initialized by a base station. Following deployment, monitors receive vibration signals at pro... | 05/20/2003 |
| 6561009 | Fuel vapor leak test system and method comprising P-I-D setting of pulse bursts to regulate target pressure A leak test system and method for a motor vehicle fuel system. A pump forces air under pressure into vapor containment space. The pump operates in accordance with steps established by a processor. The pump creates superatmospheric target pressure in the s... | 05/13/2003 |
| 6549857 | Methods for detecting leaks in pressurized piping with a pressure measurement system A method of detecting a leak in a pressurized pipeline system, in which a measurement is performed to determine the difference in the rate of change of pressure due to a leak between one pressure level and at least one other pressure level, after compensa... | 04/15/2003 |
| 6535827 | Method and apparatus for detecting and isolating a rupture in fluid distribution system Rupture path logic methods of detecting, locating and isolating ruptures within a fluid piping system are disclosed, wherein a rupture within a piping system can be detected and isolated based solely upon local pressure and flow rate measurements at indiv... | 03/18/2003 |
| 6526358 | Model-based detection of leaks and blockages in fluid handling systems A fault detection and isolation system for detecting leaks and blockages in a fluid handling system having at least one component through which fluid flows includes sensors for measuring fluid conditions upstream and downstream of the component. The senso... | 02/25/2003 |
| 6522980 | Method and algorithm for predicting leak rates A method and algorithm for predicting the fluid loss rate of a system, uses data for the leak rate from the system for a substitute fluid that leaks at a different rate than the system fluid. In the illustrated embodiment, the system is a pneumatic tire a... | 02/18/2003 |
| 6487892 | Fault detection apparatus and method for fuel vapor purge system A test apparatus for a fuel vapor purge system that performs frequent tests. The testing apparatus detects leakage of fuel vapor from a system passage by sealing the system passage and monitoring changes in the pressure. After the test, the apparatus appl... | 12/03/2002 |
| 6484108 | Method for predicting recovery boiler leak detection system performance A system and method for presenting the tradeoffs among the sensitivity, false alarms and off-line operation of recovery boiler leak detection systems. For any given recovery boiler, the system and method utilizes prior data from that recovery boiler to pr... | 11/19/2002 |
| 6481266 | Process for cylinder-selective leakage testing of the combustion chambers in a combustion engine A process for the cylinder-selective leakage testing of the combustion chambers of a combustion engine is carried out during engine operation, but with the combustion process being suppressed. From the time progression of an engine shaft speed value, engi... | 11/19/2002 |
| 6470281 | Method and apparatus for measuring a throttle point In a process and a device for measuring a throttle point, a fluid under pressure is applied to the throttle point by a pump, at least one operating parameter of the pump is acquired and stored, at least two reference operating parameters of two reference ... | 10/22/2002 |
| 6453247 | PC multimedia-based leak detection system for water transmission and distribution pipes This invention pertains to the detection of leaks in plastic water distribution pipes by processing the sound or vibration induced in the pipe by water escaping under pressure. Acoustic leak signals are measured at two (or more) contact points with the pi... | 09/17/2002 |
| 6401045 | Method and apparatus for monitoring operational performance of fluid storage systems The operational performance of a fluid storage and dispensing system is monitored by measurement apparatus which measures a volume associated with the system. A plurality of measurement data is collected from the measurement apparatus in a form readable b... | 06/04/2002 |
| 6374663 | Method and device for leakage testing in a tank system Methods for testing leakage in a tank system are disclosed including sealing the tank system, creating a pressure variation in the sealed tank system, measuring the pressure values in the sealed tank system at predetermined time intervals for a measuring ... | 04/23/2002 |
| 6374187 | Underground storage tank monitoring system and method An underground storage tank monitoring system and method uses special micropower impulse radar probes, with one such probe being inserted into each storage tank. The micropower impulse radar probes use flexible waveguides which extend downward to the tank... | 04/16/2002 |
| 6223130 | Apparatus and method for detection of a leak in a membrane of a fluid flow control system An apparatus, method, and computer program product for detection of fluid leakage through a membrane in a fluid flow control system. The fluid flow control system has a first chamber and a second chamber. A membrane is disposed between the first chamber a... | 04/24/2001 |
| 6164123 | Fuel system leak detection A vehicle fuel system has on-board diagnostics for leak testing with correction for different operating conditions. An electronic control unit (ECU) is arranged to carry out a periodic two stage leak test, when the engine is running. Stage A includes evac... | 12/26/2000 |
| 6081767 | Method and device for determining the amount of undissolved gas in a hydraulic system The invention provides a method for determining the amount of undissolved gas present in a hydraulic system by supplying hydraulic medium thereto under overpressure, one of the parameters Pressure (P) and Volume (V) being set during this supply and the co... | 06/27/2000 |
| 6076048 | System and method for least squares filtering based leak flow estimation/detection using exponentially shaped leak profiles A method and system for detecting and estimating leaks in an industrial boiler whereby the method and system formulate the leak detection problem as a least squares fitting problem, where one or more of the fitted parameters estimate leak flows. The metho... | 06/13/2000 |
| 5974862 | Method for detecting leaks in pipelines The invention relates to detecting leaks in a pipeline using enhanced methods of data sensing, digitally encoded transmission, and cross-correlation. A plurality of acoustic sensors are applied to the pipeline to sense a combination of signals from the le... | 11/02/1999 |
| 5953682 | Automated gas cylinder tracking system An automated gas cylinder monitoring system includes: a data storage collar associated with a gas cylinder including a resident memory and an insulated housing, the insulated housing being configured for coupling with a gas cylinder; a read/write probe fo... | 09/14/1999 |
| 5883815 | Leak detection system A method for thermal volume modeling of the pipe fluid volume change by taking temperature change measurements of pipe fluid taken at a single location, and comparing it to the changes in the fluid volume inside a tank hydraulically connected to a said pi... | 03/16/1999 |
| 5847264 | Leak tester with flexible equation capabilities A programmable leak tester is implemented to include the ability for performing a math step in conjunction with the program steps. The math step can use as inputs the result of a previous step, a register value, or a previous compensation or calibration v... | 12/08/1998 |
| 5808909 | Electronic brake control valve tester for rail cars and trains An automatic, computer controlled air brake testing system having an opening and closing means for opening and closing air passages of a railroad car brake system, a pressure measuring means for determining pressure in the car brake system, a flow measuri... | 09/15/1998 |
| 5757664 | Method and apparatus for monitoring operational performance of fluid storage systems The operational performance of a fluid storage and dispensing system is monitored by measurement apparatus which measures a volume associated with the system. A plurality of measurement data is collected from the measurement apparatus in a form readable b... | 05/26/1998 |
| 5748496 | Diagnosis system A diagnosis system having sensors for supervising a plant, signal processors for processing signals of the sensors, and a state quantity arithmetic operation unit. The state quantity arithmetic operation unit calculates a quantity of state expressing the ... | 05/05/1998 |
| 5719785 | Detection and quantification of fluid leaks An apparatus and a method for quantifying the leak flow rate of a fluid from a fluid leak site in a piping system. An ultrasonic sound detector is used to accumulate sound level data for known leak sites in known piping system elements through which a kno... | 02/17/1998 |
| 5675506 | Detection of leaks in vessels An apparatus and process for determining the existence and location of a leak in a vessel such as a container or an above ground or underground pipe, comprises a plurality of remote acoustic transmission sensor units distributed along the pipe and each co... | 10/07/1997 |
| 5656999 | Fluid leak containment system A system for use with an electric power transmission device having oil filtration apparatus including an oil filtration unit arranged external to the electric power transmission device, a motor-driven circulation pump and at least one conduit extending be... | 08/12/1997 |
| 5650943 | Apparatus and method for testing for valve leaks by differential signature method A portable computing device is used for acoustic testing of valve systems for valve leaks. Transducers are applied to appropriate locations in the valve system to obtain sound signals, which are fast Fourier transformed into valve signatures. Multiple sig... | 07/22/1997 |
| 5625150 | Integrated acoustic leak detection sensor subsystem A sensor system for mapping absolute acoustic noise intensity in a three-dimensional acoustic noise field. Localized noise sources within a vessel are extracted using a distant array of transducers mounted on the vessel wall. The absolute intensity can be... | 04/29/1997 |
| 5623421 | Monitoring pressurized vessels for leaks, ruptures or hard hits A device monitors a pressurized vessel to detect small leaks, ruptures and hard hits on the vessel. Transducers are attached to the vessel and transmit acoustic signals which are processed to extract frequency spectra which contain dominant resonant frequ... | 04/22/1997 |
| 5619423 | System, method and apparatus for the ultrasonic inspection of liquid filled tubulars and vessels The invention relates to an improved system, method and apparatus for the external ultrasonic inspection of fluidized tubulars and tanks. The apparatus utilizes couplantless, contactless, computer controlled, Electromagnetic Acoustic Transducer (EMAT) pro... | 04/08/1997 |
| 5586050 | Remotely controllable LNG field station management system and method A remotely controllable apparatus, system and method for monitoring, inventory, controlling and reporting on the filling, refilling and dispensing of Liquified Natural Gas (LNG) at portable temporary or semi-permanent field-located storage and dispensing ... | 12/17/1996 |
| 5578993 | Temperature compensated annunciator A solid state temperature compensated annunciator is disclosed. The solid state temperature compensated annunciator includes a pressure sensor for measuring a pressure of the fillant within a vessel and a temperature sensor for measuring the temperature o... | 11/26/1996 |
| 5563811 | Microprocessor controlled drive circuit for a liquid nebulizer having a plurality of oscillators A circuit for causing an element to produce a substantially linear response to an input signal comprising an element for providing a response, a transistor oscillator circuit for providing an electrical output signal of variable amplitude to excite the el... | 10/08/1996 |
| 5548530 | High-precision leak detector and locator A method for detecting the presence of a leak in a segment of a pipeline. The method includes providing a site station having an ultra-sonic transducer assembly at the beginning and end of the pipeline segment, each assembly having two pairs of ultrasonic... | 08/20/1996 |
| 5544074 | Method and apparatus for detecting the position of an abnormal site of a buried pipe A device for detecting the position of a physical defect on a buried pipe includes a leak-of-fluid signal detector, a number of vibration signal detectors, and a device body and can detect the position of a site of a leak, into the ground, of a fluid runn... | 08/06/1996 |
| 5533383 | Integrated acoustic leak detection processing system A system for mapping absolute acoustic noise intensity in a three-dimensional acoustic noise field, and using three-dimensional absolute noise intensities to infer operational or performance characteristics of components or structures within the monitored... | 07/09/1996 |
| 5535136 | Detection and quantification of fluid leaks An apparatus and a method for quantifying the leak flow rate of a fluid from a fluid leak site in a piping system. An ultrasonic sound detector is used to accumulate sound level data for known leak sites in known piping system elements through which a kno... | 07/09/1996 |
| 5526678 | Time of flight measurement/rate of rise measurement method for remote leak detection in evacuated spaces Disclosed are apparatus and methods of remotely detecting leakage into an evacuated space to detect the location of the leak. A number of pressure gauges continually monitoring pressure, rise in pressure and the rate of that pressure rise of the space. Th... | 06/18/1996 |
