Detection device for detecting gas leakage of gas field pipeline flange
By designing an annular plate and spring sheet to form a sealing cavity at the gas field pipeline flange, and using a pressure sensor to detect changes in gas pressure, the problem of flange leakage was solved, enabling timely detection and wide applicability.
Patent Information
- Application Number
- CN202423120039.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-17
AI Technical Summary
In existing technologies, gas leaks cannot be detected in a timely manner at the flange connections of gas field pipelines, leading to gas leaks, environmental pollution, and economic losses.
A detection device was designed, comprising two annular plates and a spring plate. The annular plates clamp the flange and form a sealed cavity. A pressure sensor is used to detect changes in air pressure within the sealed cavity to detect leaks. The spring plate is adjustable to accommodate flanges of different thicknesses.
It enables timely detection of flange leaks, prevents gas leaks, protects the environment, and extends equipment lifespan, with a wide range of applications.
Smart Images
Figure CN223537420U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gas leak detection technology for gas field pipeline flanges, specifically a detection device for detecting gas leaks in gas field pipeline flanges. Background Technology
[0002] A gas field is a gas reservoir located in the same area within the Earth's crust, controlled by a single structural element. The gas extracted from the gas field needs to be transported via pipeline to a gas processing station for processing. Since the transportation distance is often long, the pipeline needs to be segmented, and then each pair of adjacent pipeline segments is connected by flanges.
[0003] Specifically, a flange connection is a detachable joint in which two pipes, fittings or equipment are first fixed to a flange, then a flange gasket is placed between the two flanges, and finally the two flanges are tightened with bolts to make them tightly connected.
[0004] In existing gas transmission pipelines, flanges are used to connect two pipelines, but leak detection is not performed at the flange connection points. If a leak occurs between the two flanges, the staff will not be able to detect it in time, which will cause a large amount of gas transported in the pipeline to leak into the external environment, polluting the atmosphere and causing economic losses. Utility Model Content
[0005] The purpose of this invention is to provide a detection device for detecting gas leaks in gas field pipeline flanges, so as to solve the problems mentioned in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution:
[0007] A detection device for detecting gas leakage in a gas field pipeline flange includes two annular plates, which are respectively fitted onto the outside of two pipelines, and the flange connecting the two pipelines is sandwiched between them.
[0008] The outer ring portions of the two annular plates are sealed together by fasteners;
[0009] The inner ring of each of the annular plates presses the second sealing ring against the end face of the flange by a ring-shaped spring sheet;
[0010] The flange, the annular plate, the spring sheet, and the second sealing ring together form a sealing cavity, and the joint between the two flanges is located entirely inside the sealing cavity. A pressure sensor for detecting the air pressure inside the sealing cavity is installed on one of the annular plates.
[0011] Preferably, a compression ring is fixedly connected to one end of the spring sheet near the flange, and the second sealing ring is pressed against the end face of the flange through the compression ring.
[0012] Preferably, the spring sheet has a recessed portion formed in the middle of the pipe along its length.
[0013] Preferably, a first sealing ring is sandwiched between the outer ring portions of the two annular plates.
[0014] Preferably, the fastener includes a plurality of second hexagonal bolts.
[0015] Preferably, the pressure sensor is positioned directly below the pipe.
[0016] Preferably, the side of the annular plate is fixed with an internal threaded sleeve that communicates with the sealing cavity, the pressure sensor is threadedly mounted on the threaded sleeve, and a third sealing ring is fitted on the end face of the threaded sleeve.
[0017] Preferably, the first hexagonal bolt on the flange is located inside the sealing cavity.
[0018] Compared with the prior art, the beneficial effects of this utility model are:
[0019] 1. When a leak occurs at the joint between two flanges, the gas inside the pipeline enters the sealing cavity, which will cause the gas pressure inside the sealing cavity to increase. The pressure sensor can detect the change in gas pressure inside the sealing cavity and complete the detection of flange leakage.
[0020] 2. Due to the presence of the spring plate, the distance between the compression ring and the annular plate along the length of the pipe can be adjusted within a certain range. During the adjustment process, the compression ring can always press the second sealing ring against the flange, maintaining a sealed connection between the compression ring and the flange. This allows the entire detection device to be installed on flanges of different thicknesses for leak detection. More specifically, since the outer rings of the two annular plates are fixedly connected by the second hexagonal bolts, the distance between the outer rings of the two annular plates cannot be adjusted. However, due to the spring plate, the distance between the two compression rings can be adjusted within a certain range. This allows the two compression rings to clamp flanges of different thicknesses under the action of the spring plate, expanding the applicability of the entire detection device. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0022] Figure 2 This is a front view cross-sectional structural diagram of the present invention;
[0023] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A in the middle;
[0024] Figure 4 This utility model Figure 3 Enlarged structural diagram at point B;
[0025] Figure 5 This utility model Figure 3 A schematic diagram of a local structure.
[0026] In the diagram: 1. Pipe; 2. Flange; 3. First hexagonal bolt; 4. Ring plate; 5. Second hexagonal bolt; 6. Sealing cavity; 7. First sealing ring; 8. Spring plate; 801. Recess; 9. Extrusion ring; 10. Second sealing ring; 11. Pressure sensor; 12. Internal threaded sleeve; 13. Third sealing ring. Detailed Implementation
[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0028] Please see Figures 1-5 This utility model provides a technical solution:
[0029] A detection device for detecting gas leaks in gas field pipeline flanges is used to detect whether there is a gas leak in the flange 2 connecting two pipelines 1. The device includes two annular plates 4, the specific structure of which is shown in the figure. The two annular plates 4 are respectively fitted on the outside of the two pipelines 1, and the flange 2 connecting the two pipelines 1 is sandwiched between them. Specifically, the inner diameter of the annular plate 4 is slightly larger than the outer diameter of the pipeline 1 and smaller than the outer diameter of the flange 2. The annular plate 4 can be made of stainless steel to prevent rusting.
[0030] The outer ring portions (i.e., the outer edges of the two annular plates 4) are sealed together by fasteners. Specifically, the fasteners include several second hexagonal bolts 5. A first sealing ring 7 is sandwiched between the outer ring portions of the two annular plates 4. During actual installation, the second hexagonal bolts 5 tighten the outer ring portions of the two annular plates 4 to compress the first sealing ring 7, thereby achieving a sealed connection between the outer ring portions of the two annular plates 4.
[0031] The inner ring of each annular plate 4 is pressed against the end face of the flange 2 by a ring-shaped spring plate 8. The material of the spring plate 8 is the same as that of the annular plate 4, and the spring plate 8 and the annular plate 4 can be seamlessly connected by welding. The thickness of the spring plate 8 is less than that of the annular plate 4.
[0032] Flange 2, annular plate 4, spring plate 8, and second sealing ring 10 together form a sealing cavity 6. The joint between the two flanges 2 is completely located inside the sealing cavity 6. A pressure sensor 11 for detecting the air pressure inside the sealing cavity 6 is installed on one of the annular plates 4.
[0033] In the above scheme, the outer rings of the two annular plates 4 are sealed together, so the gas inside the sealed cavity 6 will not diffuse into the external environment through the gap between the outer rings of the two annular plates 4; furthermore, because the spring plate 8 and the annular plate 4 are seamlessly connected by welding, the gas inside the sealed cavity 6 cannot diffuse into the external environment through the connection between the spring plate 8 and the annular plate 4; furthermore, because the spring plate 8 and the flange 2 are sealed together by the second sealing ring 10, the gas inside the sealed cavity 6 will not diffuse into the external environment through the gap between the spring plate 8 and the flange 2; thus, a completely sealed state is achieved for the sealed cavity 6. In this state, when a leak occurs at the joint between the two flanges 2, the pipe... When gas inside pipe 1 enters the sealed cavity 6, it causes an increase in the internal pressure of the sealed cavity 6. The pressure sensor 11 can detect the change in internal pressure of the sealed cavity 6 and complete the detection of leakage in flange 2. Furthermore, the pressure sensor 11 can be electrically connected to a relevant alarm (not shown in the figure) so that the alarm can be used to issue an alarm signal. In this embodiment, the pressure sensor 11 is located directly below pipe 1, so that pipe 1 can be used to protect the pressure sensor 11 to a certain extent, which can extend the service life of the pressure sensor 11 in the field environment. In this embodiment, the pressure sensor 11 can be the DM1001 sensor from Wuxi Dunmin Technology Co., Ltd.
[0034] In this embodiment, a compression ring 9 is fixedly connected to one end of the spring sheet 8 near the flange 2. Specifically, the material of the compression ring 9 can be the same as that of the annular plate 4, and the spring sheet 8 and the compression ring 9 can also be seamlessly connected by welding. The second sealing ring 10 is pressed against the end face of the flange 2 by the compression ring 9. The compression ring 9 can increase the contact area between the spring sheet 8 and the second sealing ring 10, and the elastic force generated by the spring sheet 8 after being compressed is more evenly applied to the second sealing ring 10, thereby improving the sealing effect between the spring sheet 8 and the flange 2.
[0035] In this embodiment, the spring plate 8 has a recessed portion 801 formed in the middle of the pipe 1 along its length. As can be seen from the figure, the cross-section of the spring plate 8 is U-shaped. The function of the spring plate 8 in this solution is that, due to the presence of the spring plate 8, the distance between the compression ring 9 and the annular plate 4 along the length of the pipe 1 can be adjusted within a certain range. During the adjustment process, the compression ring 9 can always press the second sealing ring 10 against the flange 2, maintaining the sealed connection between the compression ring 9 and the flange 2. In this way, the entire detection device can be installed on flanges 2 of different thicknesses for leak detection. More specifically, since the outer rings of the two annular plates 4 are fixedly connected by the second hexagonal bolts 5, the distance between the outer rings of the two annular plates 4 cannot be adjusted. However, due to the spring plate 8, the distance between the two compression rings 9 can be adjusted within a certain range. This means that the two compression rings 9 can clamp flanges 2 of different thicknesses under the action of the spring plate 8, thus expanding the applicability of the entire detection device.
[0036] The side of the annular plate 4 is fixed with an internal threaded sleeve 12 that communicates with the sealing cavity 6. The pressure sensor 11 is threaded onto the threaded sleeve 12, and a third sealing ring 13 is fitted onto the end face of the threaded sleeve 12; thus enabling quick replacement of the pressure sensor 11 when it is damaged.
[0037] In this embodiment, the first hexagonal bolt 3 on the flange 2 is located inside the sealing cavity 6, which can protect the first hexagonal bolt 3, prevent the first hexagonal bolt 3 from being corroded by rainwater, and extend the service life of the first hexagonal bolt 3.
[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A detection device for detecting gas leaks in gas field pipeline flanges, characterized in that, It includes two annular plates, which are respectively fitted onto the outside of two pipes, and the flange connecting the two pipes is sandwiched between them; The outer ring portions of the two annular plates are sealed together by fasteners; The inner ring of each of the annular plates presses the second sealing ring against the end face of the flange by a ring-shaped spring sheet; The flange, the annular plate, the spring sheet, and the second sealing ring together form a sealing cavity, and the joint between the two flanges is located entirely inside the sealing cavity. A pressure sensor for detecting the air pressure inside the sealing cavity is installed on one of the annular plates.
2. The detection device for detecting gas leakage in gas field pipeline flanges according to claim 1, characterized in that, A compression ring is fixedly connected to one end of the spring sheet near the flange, and the second sealing ring is pressed against the end face of the flange through the compression ring.
3. The detection device for detecting gas leakage in gas field pipeline flanges according to claim 1, characterized in that, The spring sheet has a recessed portion formed in the middle of the pipe along its length.
4. The detection device for detecting gas leakage in gas field pipeline flanges according to claim 1, characterized in that, A first sealing ring is sandwiched between the outer ring portions of the two annular plates.
5. The detection device for detecting gas leakage in gas field pipeline flanges according to claim 1, characterized in that, The fasteners include a number of second hexagonal bolts.
6. The detection device for detecting gas leakage in gas field pipeline flanges according to claim 1, characterized in that, The pressure sensor is located directly below the pipe.
7. The detection device for detecting gas leakage in gas field pipeline flanges according to claim 1, characterized in that, The annular plate is fixed with an internal threaded sleeve that communicates with the sealing cavity. The pressure sensor is threaded onto the threaded sleeve, and a third sealing ring is fitted onto the end face of the threaded sleeve.
8. The detection device for detecting gas leakage in gas field pipeline flanges according to claim 1, characterized in that, The first hexagonal bolt on the flange is located inside the sealing cavity.