JP2009156739A - Gas leak inspection apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method capable of detecting leak gas, and detecting and inspecting a gas leak spot, even when a difference between a temperature of passing gas in a gas pipe and an atmospheric temperature in the periphery of the gas pipe is zero or small and/or when a leak gas quality is small. <P>SOLUTION: In this portable gas leak inspection apparatus, a gas flow detection part and a gas component detection part are provided on one end domain of a support. In addition, a gas temperature detection part may be provided on one end domain. A display part for displaying detection results of each detection part is provided near the other end of the support. The support is telescopic. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a gas leak inspection instrument, and more particularly to a portable gas leak inspection instrument used in daily inspections at a plant.

  For flue, gas piping, gas tanks, gas piping equipment, etc. in the plant, daily inspections are usually conducted for the presence or absence of gas leakage every predetermined period. Many types of detectors for this purpose are known depending on the type and properties of the gas to be inspected. For example, when the temperature is higher than the outside air temperature, such as flue gas, gas leakage from the flue can be detected in a non-contact position at a certain distance using an infrared thermograph, and the leak location can also be specified. . However, in the infrared thermograph, it is difficult to specify the presence or absence of gas leakage when there is almost no difference between the gas temperature and the outside air temperature or in the case of a low temperature gas.

  On the other hand, in the case of high-pressure gas, gas with a high flow velocity in the pipe, or harmful gas, when these gases leak from the gas pipe, etc., the inspector uses visual, auditory, and olfactory senses to determine the leak location based on experience. Although it can be specified, for example, by using a detector such as an anemometer or a gas detector, it is possible to specify the leak location more reliably.

However, when an inspection is performed using an anemometer or a gas detector, it is necessary to take measurements close to the gas piping, etc. There's a problem. Further, in a normal inspection for checking the presence or absence of gas leakage, it is very troublesome to carry these detectors and switch them for each individual pipe and device.
Japanese Patent Laid-Open No. 10-300079 Japanese Utility Model Publication No. 5-17793

  In view of the above circumstances, the present invention provides a portable gas leak inspection instrument that can cope with gas leak detection and can be safely inspected even if the type and properties of gas present in gas piping and the like are different. The purpose is to provide.

  According to the present invention, there is provided a gas leak inspection instrument characterized in that a gas flow detection unit and a gas detection unit are provided in one end region of a support.

  The gas leak inspection instrument of the present invention may be provided with a temperature detector in one end region of the support. The arrangement of each of these detectors can be set as appropriate in consideration of their shape and the like, but is preferably arranged close to each other, and in order to improve the detection accuracy of the presence or absence of gas flow, gas flow detection More preferably, the portion is provided at a position closest to the inspection target.

  The gas leakage spot inspection tool of the present invention has a simple structure and is portable, and can detect the presence or absence of various gas leaks easily and safely with a single unit and accurately identify the leak spot.

  The gas leakage inspection instrument of the present invention has a structure in which a gas flow detection unit and a gas component detection unit, or these and a gas temperature detection unit are arranged and fixed in one end region of the support.

  The gas flow detection unit may be any measurement method as long as it can detect a gas flow, and a conventionally known anemometer, anemometer, or the like can be used. Examples of the anemometer include a hot wire type, a windmill type (bilam type), a pitot tube type, and a laser type. Examples of the anemometer include a windmill type and an ultrasonic type. These may be selected as appropriate in consideration of the shape of the appearance and attachment to the support.

  As the gas component detector, a so-called gas detector that can detect one or more specific components in the gas qualitatively or quantitatively can be suitably used. Usually detectable inorganic gases such as carbon monoxide, carbon dioxide, hydrogen sulfide, chlorine, sulfur disulfide, nitrogen dioxide, ammonia and hydrogen cyanide, organic gases such as methane, isobutane, formaldehyde, ethylene oxide, benzene, toluene and methanol And steam. The gas detector includes a suction method and a contact method with a probe, and both of them can be used in the present invention. An odor meter can also be used. When a gas with a potential for leakage can be identified, the above gas detector can be selected according to the gas component, and when the gas with the potential for leakage is a mixture of multiple components, different types of gases can be used at the inspection site. When a large number of pipes are laid, a combined gas detector that can detect a plurality of gas components simultaneously can be used.

  Examples of the gas temperature detector include a resistance temperature detector and a thermocouple. These may be accommodated in a sheath tube or a protective tube.

  Each of the detection units may be integrally provided with a display device, but may be provided so as to be separable. In the former case, it is preferable that each measurement result has a function of outputting a signal to the outside. The external output function may be connected to a display device arranged separately, via a signal line, and the detection result may be transferred wirelessly. In the latter case, it is preferable that the detection result can be transferred to the display device by wire or wirelessly.

  The support is not particularly limited as long as it is a long shaft body that can be gripped by the inspector at one end region, and is a tube body such as a cylinder and a square tube, a column body such as a round bar and a square bar, and an elongated rectangular plate. Any of such elongated plate bodies may be used. It is preferable to take a tube in consideration of strength and lightness (portability), and it is particularly preferable that the length thereof can be freely expanded and contracted. Specifically, it consists of a plurality of pipes with different diameters, each of which has a small diameter pipe accommodated in a large diameter pipe, and the pipe contained inside is pulled out at one end of each pipe. And the like provided with fixing means for fixing at the position. In this way, the support tool can be expanded and contracted, and the presence or absence of gas leakage and the location of the leak can be specified with the support tool extended, thereby ensuring the safety of the inspector.

  The gas flow detection unit and the gas component detection unit, or these and the gas temperature detection unit are arranged and fixed in one end region of the support. These detection units may be separately fixed to one end region of the support using a known fixing tool, and may be fixed in proximity to one pedestal so that the pedestal is fixed to the one end region. It may be. In the latter case, the pedestal is preferably connected to the support via a universal joint or the like so that the pedestal can be rotated in the front-rear and left-right directions with these detectors mounted.

  An indicator capable of displaying the detection result of each detector can be provided near the other end of the support. This display device is preferably provided with a display window on its surface or the like, and can display digital display or analog display, or any of them. In addition, the display device is not particularly limited in the mounting position and the fixing method to the portion near the other end of the support, and the support using a known fixture appropriately selected according to the cross-sectional shape of the support. Can be fixed.

  Moreover, in order to reduce the influence by the wind which flows around gas piping, it is preferable to cover each said detection part with a plate-shaped or tubular windproof device. By using such a windproof device, it is possible to form an air passage for leaking gas. The windbreak device can be fixed by using a known fixing tool and fixing method.

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited to the embodiments shown in the drawings. In the following drawings, the same reference numerals are used for the same or common parts.

  FIG. 1 is a perspective view showing an example of an embodiment of the gas leakage inspection instrument of the present invention. In this figure, the gas leakage inspection instrument 1 includes a windmill-type anemometer (gas flow detection unit) 10, a gas detector (gas component detection unit) 20, and a resistance temperature detector (gas temperature detection unit) at one end region of the support 40. ) 30 is arranged. These detectors are fixed to a pedestal 41 provided at one end of the support 40, engaged with a side surface of the pedestal 41, and a cylindrical windproof device 11 is provided so as to cover each of the detection units. . As this windbreak device 11, a transparent heat resistant material etc. can be used conveniently. Further, near the other end of the support 40, a display device 50 having display windows 51, 52, and 53 for displaying the measurement results of these detectors is provided.

  The windmill-type anemometer 10 is placed most on the front side (the left side in the figure) from the other detectors, that is, on the outer surface of the gas pipe or the like to be inspected so that the leaked gas flow can be directly received on the rotating surface of the windmill. It is arranged at a close position. As shown in FIG. 1, the gas detector 20 and the resistance temperature detector 30 are disposed in the cylindrical body 11 in the vicinity of the windmill-type anemometer 20 and directly below and downstream thereof. The gas detector 20 and the resistance temperature detector 30 are not limited to the above arrangement as long as they are provided close to the windmill-type anemometer 10.

  The support 40 is configured by sequentially combining a plurality of cylindrical pipe pieces 42, 43, and 44 having different diameters, and the small-diameter pipe pieces 42 and 43 are slid from the pipe pieces 43 and 44 that are outer pipes, respectively. The pipe pieces 43 and 44 are provided with fixing means 43a and 44a that can be fixed in a state where the pipe pieces 42 and 43 are pulled out. A pedestal 41 is connected to the free end of the pipe piece 42 via a universal joint 41 a, and the pedestal 41 is turnable forward, backward, left and right in one end region of the support tool 40.

  The gas leakage inspection instrument 1 according to the present embodiment is a state in which the front side of the windbreak device 11 is brought close along the outer peripheral surface of a gas pipe (not shown) in a state where the support 40 is extended to an appropriate length when used. Move with. When internal gas is leaking from the gas pipe, at least one of the gas flow detection unit 10, the gas component detection unit 20, and the gas temperature detection unit 30 detects and displays the gas depending on the property or leakage state of the gas. The display of the device 50 is changed. As a result, it is possible to detect that gas is leaking from a location facing the front side of the windbreak device 11 while being on the display side of the support tool 40 of the operator.

  The gas leak detection instrument of the present invention can be used for gas leak inspection of gas piping and piping equipment laid in the plant. In particular, it can be suitably used for gas piping in boiler facilities.

It is a figure which shows one example of embodiment of the gas leak inspection instrument of this invention.

Explanation of symbols

1 Gas Leakage Inspection Instrument 10 Gas Flow Detector 20 Gas Component Detector 30 Gas Temperature Detector 40 Support 50 Display

Claims (4)

  A portable gas leakage inspection instrument, wherein a gas flow detection unit and a gas component detection unit are provided in one end region of a support.   The portable gas leakage inspection instrument according to claim 1, wherein a gas temperature detection unit is further provided at one end region of the support.   The portable gas leakage inspection instrument according to claim 1 or 2, further comprising a display unit that displays a detection result of each of the detection units near the other end of the support.   The portable gas leak inspection instrument according to any one of claims 1 to 3, wherein the support is extendable.

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