Temporary plugging safety construction tool for welding of micro-positive pressure pipeline flange

Abstract

The utility model belongs to the technical field of oil and gas pipelines, and particularly relates to a micro-positive pressure pipeline flange welding temporary plugging safety construction tool. The micro-positive pressure pipeline flange welding temporary plugging safety construction tool comprises a pressure relief pipe, a first end of the pressure relief pipe extends into a pipeline, and a second end of the pressure relief pipe extends out of the pipeline; and the sealing piece is used for sealing the pressure relief pipe and the pipeline. According to the pipeline construction method, the temporary plugging safety construction tool for welding of the micro-positive pressure pipeline flange is used, so that a medium in a pipeline bypasses a construction section, and the medium is prevented from influencing welding of the construction section.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil and gas pipelines, and in particular relates to a safety construction tool for temporary blocking by welding a micro-positive pressure pipeline flange. Background Art

[0002] Oil and gas pipelines operate under high pressure and corrosion conditions for a long time. The mechanical properties of the pipeline metal will gradually decay, and the tiny cracks existing in the pipeline welds themselves and caused by stress corrosion will expand. When the cracks develop to a certain extent, it will cause sudden pipeline rupture accidents and lead to leakage. If the leakage is not controlled in time, it will cause economic losses or even safety accidents.

[0003] Ideally, the pipeline can be completely depressurized before repair welding or replacing the pipe section. However, in actual operation, when the pipeline has been disconnected and a blind plate has been installed to block it, gas often evaporates and gas remains in the welding operation area, affecting welding. The usual solution to the above problem is to cold cut the leaking pipe section, install butter blocking, weld flanges at both ends of the original pipeline, remove the butter after welding, and then connect the flanges to the replaced pipe section. The use of butter blocking has the following problems: First, there is a situation where the butter cannot be removed, and there may be risks such as pressure buildup after the pipeline resumes operation. Second, if the sealing effect is to be guaranteed, a large amount of butter is required, resulting in a waste of resources.

[0004] Therefore, there is an urgent need to develop a micro-positive pressure pipeline flange welding temporary plugging safety construction tool and pipeline construction method that can be used for pipeline welding. Utility Model Content

[0005] In response to the technical problems mentioned above, the present invention aims to provide a micro-positive pressure pipeline flange welding temporary plugging safety construction tool, which can be used for welding pipelines containing combustible gas.

[0006] According to the utility model, a safety construction tool for temporary plugging of slightly positive pressure pipeline flange welding is provided, comprising:

[0007] a pressure relief pipe, a first end of the pressure relief pipe extending into the pipeline and a second end of the pressure relief pipe extending out of the pipeline; and

[0008] A seal is provided between the pressure relief pipe and the pipeline.

[0009] In a specific embodiment, the seal separates the pipeline into a medium section and a construction section, the first end of the pressure relief pipe is connected to the medium section, and the medium in the medium section led out from the second end of the pressure relief pipe does not contact the construction section.

[0010] In a specific embodiment, a flow control valve is provided on the pressure relief pipe.

[0011] In a specific embodiment,

[0012] The sealing member comprises:

[0013] A sealing air bag is sealed and arranged in the pipeline;

[0014] A pressurizing tube, one end of which is connected to the sealing airbag, and the other end of which is connected to the pressurizing device.

[0015] In a specific embodiment, water is provided in the sealed airbag.

[0016] In a specific embodiment, a quick connector for connecting to the pressurizing equipment is provided on the pressurizing pipe.

[0017] In a specific embodiment, the pressurized pipe passes through the construction section of the pipeline.

[0018] Compared with the prior art, the advantages of this application are as follows.

[0019] The utility model uses a seal to seal the annulus between the pressure relief pipe and the pipeline, allowing the medium in the pipeline to bypass the construction section of the pipeline. On the one hand, this prevents the medium in the pipeline from affecting the welding of the construction section. On the other hand, it can discharge the medium in the pipeline in real time, preventing excessive pressure in the pipeline from causing the seal to fail.

[0020] This utility model is highly adaptable and suitable for repairing pipelines of varying diameters and materials. It improves pipeline repair efficiency, saving 0.5 hours per operation compared to traditional grease-sealing and welding procedures. It is easy to place and remove, preventing post-operation pipeline blockage and demonstrating high reliability. It is economical and reusable, offering low cost and ease of use.

[0021] The utility model can realize the isolation of volatile oil and gas at the front end of the oil and gas transmission pipeline when the pipeline is punctured and repaired, the pressure cannot be completely released, or there is gas volatilization, thereby achieving the conditions for safe welding. The utility model can be widely used in oil and gas gathering and transportation stations, long-distance oil and gas pipelines, and municipal water pipe network construction and maintenance work sites, and has a relatively broad application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be described below with reference to the accompanying drawings.

[0023] Figure 1 A structural schematic diagram of an embodiment of a micro-positive pressure pipeline flange welding temporary plugging safety construction tool provided by the utility model is shown;

[0024] Figure 2It shows a right side view of an embodiment of a micro-positive pressure pipeline flange welding temporary plugging safety construction tool provided by the utility model;

[0025] Figure 3 Shows Figure 2 Schematic diagram of the cross-sectional structure in the AA direction;

[0026] Figure 4 It shows a left view of an embodiment of a micro-positive pressure pipeline flange welding temporary plugging safety construction tool provided by the utility model;

[0027] Figure 5 A schematic diagram of the external structure of an embodiment of a micro-positive pressure pipeline flange welding temporary plugging safety construction tool provided by the utility model is shown;

[0028] Figure 6 The external structure diagram of the micro-positive pressure pipeline flange welding temporary plugging safety construction tool provided by the utility model is shown;

[0029] Figure 7 The utility model shows a front view of an embodiment of a micro-positive pressure pipeline flange welding temporary plugging safety construction tool provided by the utility model.

[0030] In the picture:

[0031] 1. Sealing element; 11. Sealing airbag; 12. Pressurized tube; 13. Quick connector; 14. Sealing limit ring;

[0032] 2. Pressure relief pipe; 21. First end; 22. Second end;

[0033] 3. Pipeline; 31. Medium section; 32. Construction section;

[0034] 100. Pipeline welding tools.

[0035] In this application, all drawings are schematic drawings, which are only used to illustrate the principles of the present invention and are not drawn according to the actual scale. DETAILED DESCRIPTION

[0036] The present invention will be described below with reference to the accompanying drawings.

[0037] It should be noted that the directional terms or qualifiers "upper", "lower", "left", "right" etc. used in this application are all relative to the referenced Figure 1 They are not intended to define the absolute positions of the components involved, but may vary depending on the specific situation.

[0038] Figure 1 A structural schematic diagram of an embodiment of a micro-positive pressure pipeline flange welding temporary plugging safety construction tool provided by the utility model is shown; Figure 2 It shows a right side view of an embodiment of a micro-positive pressure pipeline flange welding temporary plugging safety construction tool provided by the utility model; Figure 3 Shows Figure 2 Schematic diagram of the cross-sectional structure in the AA direction; Figure 4 It shows a left view of an embodiment of a micro-positive pressure pipeline flange welding temporary plugging safety construction tool provided by the utility model; Figure 5 A schematic diagram of the external structure of an embodiment of a micro-positive pressure pipeline flange welding temporary plugging safety construction tool provided by the utility model is shown; Figure 6 The external structure diagram of the micro-positive pressure pipeline flange welding temporary plugging safety construction tool provided by the utility model is shown; Figure 7 The utility model shows a front view of an embodiment of a micro-positive pressure pipeline flange welding temporary plugging safety construction tool provided by the utility model.

[0039] like Figures 1 to 7 As shown, the pipe welding tool 100 mainly includes a pressure relief pipe 2 and a sealing element 1 .

[0040] In this embodiment, the pressure relief pipe 2 has a first end 21 and a second end 22. The first end 21 of the pressure relief pipe 2 extends into the pipeline 3, and the portion of the pressure relief pipe 2 extending into the pipeline 3 is coaxially disposed within the pipeline 3. The second end 22 of the pressure relief pipe 2 extends out of the pipeline 3. The seal 1 seals the annular space between the pressure relief pipe 2 and the pipeline 3.

[0041] In this setting, the seal 1 separates the pipeline 3 into a medium section 31 on the right and a construction section 32 on the left. The first end 21 of the pressure relief pipe 2 is connected to the medium section 31, and the pressure relief pipe 2 passes through the seal 1 in a sealed manner. The medium in the medium section 31 can enter the pressure relief pipe 2 through the first end 21 of the pressure relief pipe 2, and be discharged from the second end 22 of the pressure relief pipe 2 under the guidance of the pressure relief pipe 2. By setting the pressure relief pipe 2 and setting the second end 22 of the pressure relief pipe 2 at a position away from the construction section 32, on the one hand, it is possible to prevent the medium flowing out of the medium section 31 from affecting the welding of the construction section 32. On the other hand, the medium in the medium section 31 can be discharged in real time, avoiding excessive pressure in the medium section 31 affecting the sealing of the seal 1.

[0042] In this embodiment, the function of the pressure relief pipe 2 is to discharge the medium in the medium section 31 of the pipeline 3. One end is connected to the medium section 31 of the pipeline 3, and the other end is placed 30 meters away from the welding position. A 6' metal hose is used, each 10m long, a total of 3, and quick connectors are used to connect adjacent pressure relief pipes 2.

[0043] In a preferred embodiment, a flow control valve is provided on the pressure relief pipe 2. By controlling the flow control valve, the flow rate of the medium flowing out of the medium section 31 can be controlled.

[0044] In a specific embodiment, the sealing member 1 includes a sealing airbag 11 and a pressurizing tube 12 .

[0045] After the sealing airbag 11 is inflated, the overall structure is a cylindrical structure with a central hole.

[0046] The pressure relief pipe 2 is sealed and passed through the center hole of the sealing airbag 11. Specifically, a sealing limit ring 14 is provided between the pressure relief pipe 2 and the center hole of the sealing airbag 11.

[0047] The outer wall of the sealing airbag 11 is sealed to the inner wall of the pipe 3. Specifically, a sealing limiting ring 14 is provided between the outer wall of the sealing airbag 11 and the inner wall of the pipe 3.

[0048] The function of the sealing bladder 11 is to isolate the medium in the pipe 3. In this embodiment, the sealing bladder 11 is made of high-quality rubber and is expanded by water filling. When the pressure within the sealing bladder 11 reaches 0.2 MPa, the sealing bladder 11 fills the entire annular cross-section between the pipe 3 and the pressure relief pipe 2. The sealing is achieved by friction between the sealing bladder 11, the pipe 3, and the pressure relief pipe 2. This is suitable for pipes of different diameters, different planes, and different locations. Thus, the water filling and expansion quickly blocks the medium flow in the target pipe section, achieving the goal of preventing oil and gas leakage.

[0049] The pressurized tube 12 axially passes through the construction section 32 of the pipeline 3. One end of the pressurized tube 12 is connected to the sealing airbag 11, and the other end is connected to the pressurizing device. After the pressurizing device is activated, it can pressurize the sealing airbag 11 through the pressurized tube 12, thereby sealing the sealing airbag 11 from the pipeline 3 and the pressure relief pipe 2.

[0050] In this embodiment, the pressurized pipe 12 is a 6' sealed hose with a length of 1.5 m.

[0051] In a preferred embodiment, water is placed in the sealing airbag 11. Using water pressure can firstly cool the temperature near the welding working surface of the pipeline 3; secondly, it is less likely to form an explosive mixed gas compared to air, which is safer; and thirdly, it is more convenient and readily available than nitrogen.

[0052] In a preferred embodiment, a quick connector 13 for connecting to a pressurizing device is provided on the pressurizing pipe 12 .

[0053] According to the present invention, a pipeline construction method is also provided, using the micro-positive pressure pipeline flange welding temporary plugging safety construction tool provided by the present invention, so that the medium in the pipeline 3 bypasses the construction section 32, thereby avoiding the medium affecting the welding of the construction section 32.

[0054] According to the utility model, the pipeline construction method includes the following steps:

[0055] Step 1: Cut the pipe;

[0056] Step 2: Use the seal 1 to seal the pipeline, dividing the pipeline into the medium section 31 and the construction section 32, and set the second end of the pressure relief pipe 2 to prevent the medium drawn out from the medium section 31 from contacting the construction section 32;

[0057] Step 3: Weld the construction section 32.

[0058] In a specific embodiment, the above pipeline construction method is further described in detail, including the following steps.

[0059] S1, blocking the material in the leaking pipe 3, depressurizing the pipe 3, and installing a blind plate in the pipe 3. This step is well known to those skilled in the art and will not be described in detail here.

[0060] S2. Cold cutting is performed near the puncture leakage part of the pipe 3 to disconnect the pipe 3. Specifically, the puncture leakage part of the pipe 3 is removed from the pipe 3 by cold cutting. The cold cutting method is well known to those skilled in the art and will not be described in detail here.

[0061] S3, place the sealing airbag 11 at least 20cm from the welding position of the pipe 3, that is, Figure 1 The left end of the sealing airbag 11 is at least 20 cm away from the left end of the construction section 32 to prevent damage to the sealing airbag 11 due to heat generated during welding. The pressure relief pipe 2 is placed within the central hole of the sealing airbag 11. In this embodiment, three pressure relief pipes 2 are connected in series to form a long pipeline. The second end 22 of the pressure relief pipe 2 is placed at least 30 meters from the welding location to prevent the medium discharged from the pressure relief pipe 2 from affecting the welding process.

[0062] S4. First, fill the sealed airbag 11 with water, connect the pressurizing tube 12 to the pressurizing device and start pressurizing. When the pressure in the sealed airbag 11 reaches 0.2 MPa, stop pressurizing.

[0063] S5. Detect the combustible gas concentration around the welding operation. When the concentration meets the operation requirements, weld the flange at the left end of the construction section 32.

[0064] S6. After welding is completed, open the pressurized pipe 12 to release the pressure, and take out the sealed airbag 11 and related components.

[0065] S7. The operation is completed.

[0066] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0067] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0068] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0069] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A micro-positive pressure pipeline flange welding temporary plugging safety construction tool, characterized in that: include: a pressure relief pipe (2), wherein a first end (21) of the pressure relief pipe (2) extends into the pipeline (3), and a second end (22) of the pressure relief pipe (2) extends out of the pipeline (3); and A sealing member (1) seals between the pressure relief pipe (2) and the pipeline (3).

2. The micro-positive pressure pipeline flange welding temporary plugging safety construction tool according to claim 1 is characterized in that: The sealing member (1) separates the pipeline (3) into a medium section (31) and a construction section (32); the first end (21) of the pressure relief pipe (2) is connected to the medium section (31); and the medium in the medium section (31) led out from the second end (22) of the pressure relief pipe (2) does not contact the construction section (32).

3. The micro-positive pressure pipeline flange welding temporary plugging safety construction tool according to claim 1 is characterized in that: A flow control valve is provided on the pressure relief pipe (2).

4. The micro-positive pressure pipeline flange welding temporary plugging safety construction tool according to any one of claims 1 to 3, characterized in that: The sealing member (1) comprises: a sealing air bag (11) sealedly arranged in the pipe (3); A pressurizing tube (12), one end of which is connected to the sealing airbag (11), and the other end of which is connected to a pressurizing device.

5. The micro-positive pressure pipeline flange welding temporary plugging safety construction tool according to claim 4 is characterized in that: Water is arranged in the sealing airbag (11).

6. The micro-positive pressure pipeline flange welding temporary plugging safety construction tool according to claim 4 is characterized in that: The pressurizing pipe (12) is provided with a quick connector (13) for connecting with the pressurizing equipment.

7. The micro-positive pressure pipeline flange welding temporary plugging safety construction tool according to claim 4 is characterized in that: The pressurized pipe (12) passes through the construction section (32) of the pipeline (3).

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