827 results about "Gas leak" patented technology

A method for locating gas leaks from underground gas pipelines in which a first acoustic sensor having a first signal output is positioned in ground disposed substantially above or at a distance from the underground gas pipeline. At least one second acoustic sensor having a second signal output is positioned in the ground at a plurality of locations substantially above the underground gas pipeline. The output signals from the acoustic sensors are measured for each location of the second acoustic sensor and the signals are adaptively filtered to remove common noise signal components. The statistical minima of these rms voltages are determined for both the first output signal and the adaptively filtered second output signals and the differences determined. The location of the second acoustic sensor corresponding to the largest positive said difference is the location closest to the leak site.

A system is described that is suitable for use in determining the location of leaks of gases having a background concentration. The system is a point-wise backscatter absorption gas measurement system that measures absorption and distance to each point of an image. The absorption measurement provides an indication of the total amount of a gas of interest, and the distance provides an estimate of the background concentration of gas. The distance is measured from the time-of-flight of laser pulse that is generated along with the absorption measurement light. The measurements are formated into an image of the presence of gas in excess of the background. Alternatively, an image of the scene is superimosed on the image of the gas to aid in locating leaks. By further modeling excess gas as a plume having a known concentration profile, the present system provides an estimate of the maximum concentration of the gas of interest.

A leak tester which detects leakage of a gas from a measured object, the leak tester including a source of a pressurized gas which supplies the pressurized gas, a differential pressure detecting section which detects a pressure difference between the pressure of a gas in the measured object and the pressure of a pressurized gas supplied by the source of the pressurized gas, and a pressure adjusting section which makes the pressure of the pressurized gas supplied by the source of the pressurized gas constant.

The invention discloses a test device for high-pressure combustible gas leakage spontaneous combustion and shock wave induction ignition. The whole test device comprises a test gas bottle, a nitrogen gas bottle, a high-pressure ventilating pipeline, a pressure stabilization valve, an electromagnetic valve, a pressure gauge, a vacuum pump, a high-pressure storage tank, a pressure transducer, an ICP (inductively coupled plasma) pressure sensor, a photoelectric diode, a rupture disk clamp (in which a rupture disk is arranged), downstream pipelines, a schlieren, a high-speed camera, a protection box, an air compressor and the like. The device can be used for (1) researching the influence of factors, such as different leakage pressures, shapes, lengths and diameters of different downstream pipelines, the gas initial temperature, a breakage shape of the rupture disk and obstacles outside an orifice, on the spontaneous combustion ignition, and further completing a spontaneous combustion ignition mechanism; (2) researching a shock wave induction ignition process and disclosing a shock wave induction ignition mechanism and influence factors thereof; (3) realizing the visible research on spontaneous combustion ignition and shock wave induction processes.

The present invention relates to the use of microbial biofilms and microbial induction of calcium carbonate precipitation to sequester gases in underground geological formations. In one embodiment, methods of the invention can be used to prevent the leakage of supercritical CO₂ in underground geological formations such as aquifers.

An apparatus and process for measuring the concentration of hydrogen gas being transferred through a nozzle from a source container to a destination container and for providing an alert and/or taking action where hydrogen gas leaks may create an unsafe condition. The invention can accurately and reproducibly respond to and measure the absolute hydrogen gas concentration within the nozzle housing using hydrogen gas sensors that are selective only to hydrogen, which do not require the presence of oxygen to operate and which do not saturate when hydrogen safety levels are reached. These sensors are positioned inside the nozzle housing to allow for the direct and immediate knowledge of the presence of hydrogen gas that cannot be safely determined by other means. An apparatus and process for detecting leaks of liquid hydrogen through a nozzle during transfer of liquid hydrogen from a source container to a destination container are also discussed.

The invention discloses a positioning method for a hazardous gas leakage diffusion accident source, and belongs to the technical field of public security emergency monitoring. The technical scheme employed by the invention is that a diffusion prediction model and monitoring sensor collection data are combined, and reverse calculation on gas source parameters is carried out, so that the error between a prediction model calculation value and a monitoring value can be minimized. The gas source positioning method comprises following steps: 1. monitoring the deployment of sensor arrays; 2. acquiring meteorology monitoring data; 3. establishing a standard wind direction coordinate system; 4. selecting gas concentration monitoring data; 5. performing optimal calculation on gas source position parameters; and 6. transforming gas source geographic position coordinates. By employing the gas leakage diffusion source positioning method, the regional hazardous gas leakage diffusion source can be rapidly and accurately positioned, and timely and effective decision supports can be provided for emergency response departments.

A leak detection system performs actions based upon the type and location of the detected leak. A plurality of sensors and sensor types are used at various locations in a building where leaks are likely to occur. Upon detection of a leak, a sensor transmits an RF signal identifying the sensor. A controller receives the RF signal and performs actions associated with the identifier for the sensor. Actions may include selectively closing or opening valves and electrical connections. Notifications are also sent by the system to building owners or occupants.

A method and apparatus for ensuring against explosion of the gaseous atmosphere of a closed chamber, such as the QDCD room of an internal turret of an offshore production and offloading buoy wherein the closed chamber has production risers and conduit connectors that represent a potential source of flammable gas. The method comprises mixing and diluting the oxidant content of the air by introducing within the closed chamber a sufficient quantity of inert gas to render the mixture of the air and any flammable gas non-combustible regardless of the flammable gas content of the mixture. The method includes removal of the non-combustible mixture of air and any flammable gas from the closed chamber by purging thereof to the natural atmosphere, while introducing inert gas, thereby leaving a substantially inert atmosphere within the closed chamber. The turret system provides for control of the gaseous atmosphere within the closed chamber at all modes of turret operation, including the idle, on-line and ventilation modes and also provides for gas pressure control to accommodate normal operating conditions and conditions of gas leakage into the chamber.

A leak detection and control system provides for remote user control of devices in responding to detected leaks of other problems. A plurality of sensors and sensor types are used at various locations in a building where leaks are likely to occur. Upon detection of a leak, a sensor sends an RF signal identifying the sensor. A controller receives the RF signal and performs actions associated with the identifier for the sensor. Actions may include selectively closing or opening valves and electrical connections. Notifications are also sent by the system to building owners, occupants, maintenance personnel or operators. An operator can contact the controller from a remote location via a telephone system or a network to check status and to activate devices.

The invention provides a method for the leak detection of an anesthesia machine system. The method comprises the following steps that: each gas passage of the anesthesia machine system, which is communicated with outside, is closed, and the anesthesia machine system becomes a closed containing cavity; an inspiratory valve is opened, the anesthesia machine system is inflated, and simultaneously, a pressure sensor of the gas passages is utilized to monitor the internal pressure of the anesthesia machine system at real time; when the internal pressure of the anesthesia machine system reaches a preset value, the inspiratory valve is closed, and inflation is stopped; the current internal pressure of the anesthesia machine system is detected; the internal pressure of the anesthesia machine system is detected again after a preset time; the decreased pressure difference of the internal pressure of the anesthesia machine system is calculated; and a corresponding data table of the pressure difference and the leak quantity is looked up according to the pressure difference, and the leak quantity leaked by the anesthesia machine system is calculated. The method can accurately detect the gas leak quantity leaked by the anesthesia machine system, and can enhance the moisture control and the monitoring accuracy of the anesthesia machine simultaneously.

PCT No. PCT/GB96/02571 Sec. 371 Date May 12, 1998 Sec. 102(e) Date May 12, 1998 PCT Filed Oct. 17, 1996 PCT Pub. No. WO97/14944 PCT Pub. Date Apr. 24, 1997A method and apparatus for testing a fluid conduit system for leaks. The apparatus is connected to an isolated section of a domestic fuel gas system which is suspected of leaking. The apparatus determines over recorded time periods the pressure drop in the system as a result of the actual gas leak and subsequently the pressure drop in the system as a result of an actual leak plus the leakage through an introduced artificial and calibrated orifice provided by the apparatus. The data is used in an equation for calculating the actual leakage rate from the system. This method avoids the need to repressurize the system between pressure drop measurements or having to know or assume the volume of the system being tested.

The invention provides a high-efficiency high pressure gas leak detection method, comprising the generation process of high pressure tracer gas and the detection process of the leak tightness of a joint on a device or a pipeline by the high pressure tracer gas; in the generation process, a container is filled with quantitative tracer gas, then liquid with pressure is led into the container, and the liquid is used for compressing the tracer gas to facilitate the pressure of the tracer gas to be raised to a set pressure value so as to turn into constant pressure tracer gas; in the detection process, inner confined space and outer confined space are established on the joint to be detected on the device or the pipeline to be detected, the inner confined space is at least provided with an inlet for injecting the constant pressure tracer gas, the outer confined space is provided with a port which is connected with a detector, and whether the tracer gas leaking from the inner confined space exists in the outer confined space is detected by the detector. The invention finds a very reliable method for petroleum industry field high pressure gas detection and achieves the aim of field leak detection by combining various processes.

The invention discloses a rapid simulation method of leakage of a high-sulfur natural gas gathering and transportation device for a marine gas field. Through analysis of leakage and diffusion distribution laws of high-sulfur natural gas in a densely populated area and optimization of a Gaussian diffusion model parameter selection method, a leakage and diffusion simulation procedure for sulfur-containing natural gas in a gathering and transportation pipeline and natural gas contained in a desulfurization device in a purification plant is acquired, and the gas leakage and diffusion result is rapidly simulated. A Gaussian model is selected, the influences of the ground roughness, the atmospheric stability and the leakage amount on gas leakage and diffusion are sufficiently considered, related parameters are corrected in combination with surroundings of a well field, the leakage and diffusion result under the four conditions of leakage of a sulfur-containing natural gas gathering and transportation pipeline, leakage of hydrogen-sulfide-containing pregnant solutions of the desulfurization device in the purification plant, leakage of hydrogen-sulfide-containing pregnant solutions of pipelines and gas leakage of pipelines of a station is rapidly and quantitatively simulated, and the longest distance that hydrogen sulfide with the concentration being 100 ppm and 1,000 ppm can reach after leakage and diffusion is obtained.

Techniques are disclosed relating to gas leak detection. The techniques can be deployed, for example, in compact, handheld portable devices usable for detecting leaks in space-confined applications. The devices generally include a non-laser light source and thermal imaging camera that allow for detection of a target gas (or gasses) that absorbs at least some of the light source's wavelengths of operation. The light source can be implemented, for example, with an incoherent infrared (IR) light source, such as a resonance lamp configured with a gas cell containing a volume of a gas that, when excited by electric discharge, emits a wavelength that is absorbed by the target gas.

The invention discloses a gas pumping sleeve-penetrating occluder and a use method thereof. The occluder is mainly formed by jointing a bag A combination and at least one bag B combination; the bag A combination comprises a No.1 bag (14),a grouting pipe (1), a gas leaking handling pipe and a transition part; the grouting pipe and the gas leaking handling pipe respectively penetrate through the No.1 bag; a check valve is arranged on the grouting pipe in the No.1 bag; the bag B combination comprises a No.2 bag and a grouting pipe penetrating through the No.2 bag; a check valve is arranged at the grouting pipe in the No.2 bag; short grouting pipes between the bag A combination and the bag B combination are jointed by a straight joint; a pumping pipe penetrates through the No.1 bag and the No.2 bag. According to the gas pumping sleeve-penetrating occluder and the use method thereof, one bag A combination and multiple bag B combinations can be serially connected, more effective grouting hole sealing can be realized on drill holes of a hole sealing section, generation and expansion of coal wall seams around the drill holes at the hole sealing section can be more effectively avoided, and the occluder can also fill extremely small coal seams, so the hole sealing effect is optimal.