SA02230085B1 - A device for detecting leakage and locating the leak - Google Patents

Abstract

Abstract: The present invention relates to a device for leakage detection and leakage analysis, having a permeable collection line which is connected with a pump (2), of the transport medium and with at least one sensor (4a) of a runaway habit (M) in the event of a leak leakage. According to the invention, a collection line (1) of mutually spun sources (7) of detectable gas (G) are identified as distance markers at known points, and thus each sensor (4a) is usually assigned to the runaway (M) of an adjacent sensor ( 4b) for gas (G) gas).,

Description

A device for detecting a leakage and locating a leak Full description Background of the invention:- This invention relates to a device for detecting a leak 06 and locating a leak “has a permeable collection line that is connected with a pump for medium Jl and with a socket 7 At least one for the fugitive in case of a leak.

° This device is defined by German patent No. DE 24 31 907 C3 and is used as a leakage detection and locating system (LEOS) for example on a pipeline (gas or petroleum 0 oil and if a material escapes from a leakage place in the cpipeline this material passes through the collection line diffusion and is thus transported by the transport medium through the collection line to the csensor by the pump; it is detected there .then locate

0 leakage based on transfer time and known flow rate. Given the length of the collection line, which in the case of pipelines, Sa, reaches 800 km; which increases appear problem or cause changes; deterministic (unavoidable) intensity; The pressure and temperature of the gaseous transport medium along the collection line and because of the high-pressure gradient necessary for its transport are not constant throughout the entire collection line \o and may change as well; So that the accuracy of locating the leakage decreases with increasing the length of the assembly line. In Alla, the collection line is long. 7 This cing is achieved according to the invention; By a device having the features of Claim 10 because the collection line is certain inter-separated sources of detectable gas

© as space marks at dime points and probe 7 of the fugitive material is assigned to an adjacent sensor of detectable gas; Accurate localization of the leakage can be achieved even if the flow rate of the transport medium in the collection line is unknown. And it suffices; For locations where detectable gas may be brought to the assembly line for accurate determination. In that case; © In the sensor the maximum occurrence of detectable gas acts as distance markers which must be assigned to a specific position on the assembly line. If, for example, a maximum limit of a substance appears between the second and third maximum value of cgas, this causes the material to enter the collection line between the second and third sources of detectable gas. And since the locations of these sources are accurately recorded, and in addition to that.; The result can be drawn from the distance between the maximum appearance of the material and the maximum of an adjacent gas Vo related to the distance of the leakage site 06 from the corresponding source position the accurate determination of the leakage is achieved reliably. and it is possible; essentially; To use a single sensor to detect both matter and gas .gas and in that case; Detectable matter and gas may coincide. It is preferred, however, to provide a detectable gas jl that does not correspond to the escaping substance in Ala the leakage and in Vo a particularly preferred embodiment that requires the use of a sensor probe for the escaping substance that does not register the gas As a result; The leakage places, which are also located approximately in the middle of the distance marks, can also be detected accurately and with high detection sensitivity. In a specific preferred embodiment of the invention, a catalyst that is not affected by the sensor to convert hydrogen into water is placed after the sensor of the substance p800010©. Yes, this ensures that the measured signal recorded by a leakage sensor is not subject to interference from hydrogen. Then there are independent sensors to detect hydrogen.

m and in particular; Space signs may be; They are approximate positive electrodes representing hydrogen sources and these positive electrodes (the anodes diy ll (anodes) are placed on the pipeline precisely known places, to prevent corrosion of the pipeline and the approximate 8 anodes generally include aluminum Which communicates electrically with the pipeline © pipeline and generates an electrochemical element Cua electrochemical The pipeline is - the negative electrode (cathode) at which the hydrogen chydrogen is released, then this hydrogen enters the pipeline collection line as a gas capable of detecting known places accurately.Alternatively, the distance markers may contain metallic objects which consist of very noble metal ga 0 approximate anodes and conduct electrically with the latter to generate an electrochemical element. Separately, in this case, hydrogen is produced in a certain and continuous manner at the proximate anode, or at a metal body connected to the proximal anode, in the case of an underwater collection line, and the metal body, which acts as the cathode, is isolated electrolytic off the approximate anode; Sa V0 in plastic. It is connected by an electrode with the approximate anode. Preferably, the supplied pump is a pressure pump connected in the flow direction with the beginning of the assembly line “00116000”. This is distinguished compared to the use of a suction pump; the possibility of building a high pressure difference along the assembly line; It exceeds the multiples of the maximum pressure difference that may be achieved using the bail pump so that the system can be used over distances greater than 115 km without the need to prepare de gana Yo systems in series. In other words, this high pressure difference may result in the collection line so that sufficient flow of transmission medium remains present even after several 100 km. using a pressure pump then; The transport medium can be transported tightly over a very large distance without the need for additional pumps. This makes it

| The invention can be used on a pipeline 6 laid under water over great distances (up to 0 km); OY in that case we need a costly pump station only at the start or end of the assembly line. And in another useful embodiment. Dedicated Lil collection DC gana collection line of 7 separate sensor units for fugitive material and gas cgas as well as all sensor units© connected by electrical source and measuring line with rating unit at end of assembly line. The fact that the sensor unit group is dedicated to the assembly line causes there to be an advantage that the dispersed material in the line is detected more quickly than can be achieved in the case of a long transport distance to the end of the collection line. In addition; After the material has been transported over a long distance das it may be distributed through a longer pipe path than in the case of penetration; Which makes detection more difficult. 0 The independent sense units only require an electrical source and a measuring line to send the measured values to a central evaluation unit at the end of the collection line and at that point; In this case; Every part of the path between the pump and the first sensor can be monitored; and between two adjacent 80802 sensor units or between the last sensor unit in the collection line and an additional sensor unit in the evaluation unit separately. \o The distance between Sensor 7 units may range from -01 00 km while the length of the whole assembly line may range from Er to 8060 km. The device subject of the invention provides an advantage over previously known leakage detection and locating systems (LEOS); It may also be used over long distances Sia clan up to Avs km; Pipelines below water are also suitable. Ye explains the device for detecting and locating the leak according to the position of the invention in detail by referring to the embodiment examples shown in the drawings; in which:

Brief annotation of the drawings: - Figure 1 shows a device according to the invention in a schematic oly; Figure 1 and ¥ show other useful embodiments; Und in the form of basic charts. Hello Detailed Description:-

° Figure 1 shows the 5000 sao) collection line, km in length, equipped with 4 sensor units; Previously known leakage detection and locating system; Which fay at the oF pump is operating as a pressure pump and ends at the unit rating? in which the final sensor unit is placed;. Other probe units are specialized; 1 collection line interspaces Each unit includes Probe 860507; On the sensor ?a of the fugitive "24" material

Vs in Alla leakage and if material escapes “24” at point (©) of an adjacent pipeline ©0; connected underwater with the assembly line; Substance 14 passes to assembly line 1 and is dispersed at the latter and at the next pump start-up; It moves with conveying medium "1" flowing in assembly line 1 to the next sensor unit 7; And register there. and connect all sensor units; Lae via source

Electrocardiogram and measuring line 1 with the oF evaluation unit, where the location of the leakage Jeakage Vo is then determined, and so that we do not need to calculate the flow rate in the very long collection line 1 in order to calculate the location of the leakage; The acceptable gas Jl V las “G cad Sl” and especially hydrogen are placed at known locations and act as distance markers. In embodying the example; They consist of anodes of approx A conventionally placed on a pipeline© laid underwater. Hydrogen forms near these approximate anodes A and; as detectable gas 0; 0.0 passes on the assembly line 1 in the same way Jie the material 14 to be discovered that has passed from the pipeline © pipeline; It is detected by the sensor unit 71 4 . For this purpose; Each unit contains 7 sockets. on an independent sensor; b is for detectable gas; e and in this example. A hydrogen sensor, chydrogen sensor, assigned to the J ¢ sensor, meaning AT ¢, assigned to each sensor; a

_y- chydrogen And because the locations of hydrogen sources 0. gas are adjacent to the gas sensor of Article 14, especially the locations of the approximate anodes 5 4; and be known; The location of the hydrogen leak may deduce from the maximum position of the substance 14 escaping from the leak between the two maximum hydrogen values .1 without the necessary need to know the flow in the assembly line which act as space markers; Provide metal bodies, approximate A anodes, and to improve the anodes °, which are electrically isolated from the latter, A consisting of a very noble metal of approximate 5 anodes 0, and more approximate A < anodes are produced by plastic and connected by By means of an electric line with the anodes, as is the case at the electrodes 01 to a large extent at those metal bodies hydrogen hydrogen themselves. Approximate A "M" escaping substance sensors and in order not to The sensors are affected by the factors of the cof sensors measured by the hydrogen sensors are affected by the interference generated by the hydrogen into uninterrupted water. hydrogen catalyst 4 which converts the hydrogen up to the pipeline ih can be identified leakage The advantage is that leaks are hard to find. © pipeline too long and detectable pipeline 0; Which gas 7 sources of gas oF can also be located according to Figures No. ? and Vo and are placed around the latter in a circular manner as seen in 1. They act as distance markers directly on the assembly line, for example, a hydrocarbon compound with the form of a number “. These sources are, for example, vessels in which low vapor pressure is placed; specifically Ethanol or a mixture of ethanol and water, which diffuses the gaseous component one to put a non-noble metal aS and alternatively, we can also use water 1 © in the hydrogen assembly line the pot. Then hydrogen (Zn) is For example, a wire composed of zinc oF (Fig. No. 11 Ye). The shown embodiments do not require sufficient yield to be detected as a distance mark with the help of the sensor or the pipeline environment. collection line 1 in Figures No. ? and ? the presence of water in assembly line environment

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M _ pipeline to be monitored; Because detectable gas production is independent of the environment around assembly line 1 or pipeline

Claims (1)

-_ q _ protection_elements 1-1 Leak Detection Device 06 and Deakage Locating with Assembly Line collection line ¥ is permeable (1); connected to a pump (?) of the transport medium and to at least one YF sensor socket (©a) of the fugitive (0) in the event of a leak; marked as the assembly line (1) collection line ¢ be certain mutually separated sources (7) of detectable gas © (0) as distance markers at known points; and that the sensor (1) of fugitive material be linked 1 to the sensor adjacent (£ b) to gas (0). 1 ?- A device according to claim number 0; marked that the gas (G) gas does not correspond to the substance (M) fugitive in the case of Y leakage 'hydrogen' is hydrogen (G) gas distinguished as gas oY device pursuant to claim no. -*1 Gay feat 1 of one of the claims 1 to ?; Characteristically, the sensor (4a) of the fugitive oY (M) is insensitive to (G) gas. 1 #- device in accordance with Clause 4; Distinguished that there is a catalyst (3) to convert hydrogen, Y 0 into water; installed after the sensor (¢ 1) of the escaping substance MM ¥ 1 +- Gay device for any of the protection elements number ; and ©; Characteristically, the approximate anodes (A) sacrificial anodes Y on the pipeline (°) are prepared as sources (7). -11- 1 7- A device according to protection element eV, distinguished in that the sources (7) are metallic objects (01) Y consisting of a very noble metal, as is the case in the approximate positive electrodes sacrificial anodes (A) YF and is electrically connected to the latter. 1 +8- device in accordance with one of the foregoing claims; Characteristically, the pump (7) is connected as a pressure pump in the Y direction of flow at the beginning of the assembly line. (1) collection line (1) collection line A device according to one of the preceding claims; it is characterized that the assembly line 4-1 is assigned to a set of 5010501 interchangeably separated sensor units (3) of the fugitive substance Y connected to the (£) sensor and that all units the sensor “(G) gas and (M) escaping substance and collection line; Electrical source route and measuring line (1) with rating unit (7) at the end of the assembly line (1). ©