Pipeline online replacement method

Abstract

The invention discloses a pipeline online replacement method. The method comprises the steps that a hole opening position is arranged on the outer wall of a pipeline body; the position between the pipe section needing to be replaced and the pipeline body is pressed through external force, so that the inner wall of the pipeline makes contact and is closed, and the pipe section needing to be replaced is cut off; the plugging device is provided with an inner cavity, a sleeving opening allowing the cut-off end of the pipeline body to stretch into the inner cavity and a hole opening structure capable of corresponding to the hole opening position. The cut-off end of the pipeline body extends into the inner cavity from the sleeving inlet, and the hole opening structure corresponds to the hole opening position. Sealing a gap between the inlet of the sleeve and the outer wall of the pipeline main body, and connecting the inlet of the switch valve with the opening structure; the switch valve is kept in the open state, the opening position of the pipeline body is opened through the opening channel and the opening structure of the switch valve, and the switch valve is switched to be in the closed state; and the switch valve is maintained in the closed state, the replacement pipe section is connected with an outlet of the switch valve, the switch valve is switched to be in the open state, and replacement operation is completed.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline replacement, and in particular to a pipeline online replacement method. Background Art

[0002] During the production process, various media pipelines are prone to cracks, sand holes and other leakage defects on the pipe walls and bends due to long-term operation under the influence of high temperature, stress, and scouring and corrosion of the conveying medium, resulting in the entire system being unable to operate normally.

[0003] The usual treatment method is to isolate the pipeline, reduce the pipeline pressure to zero pressure, drain the medium, and then seal or replace the leaking pipeline.

[0004] However, in actual production, after some pipelines leak, the pipeline system often cannot be completely isolated. The leak point can only be temporarily blocked, and the service life is short after the leak point is treated, and the leakage defect occurs frequently. When large-scale corrosion and stress cracks appear in the pipeline, due to the pressure at the leak point and the influence of the leaking medium, the pipeline can only be replaced by stopping the machine, which is very likely to cause major safety hazards such as equipment damage.

[0005] Therefore, how to facilitate online replacement of pipelines has become a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0006] In view of this, the present invention provides a pipeline online replacement method to facilitate the operation of online pipeline replacement.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A method for online replacement of a pipeline, wherein the pipeline has a pipeline body and a pipe section to be replaced arranged along its extension direction, comprising the steps of:

[0009] Setting the opening position, setting the opening position on the outer wall of the pipe body;

[0010] Cut off the pipeline, and press the position between the pipe section to be replaced and the pipeline body by external force, so that the inner wall of the pipeline contacts and closes, and cuts off the pipe section to be replaced;

[0011] A plugging device is provided, the plugging device having an inner cavity, a sleeve inlet for the truncated end of the pipe body to extend into the inner cavity, and an opening structure that can correspond to the opening position; the truncated end of the pipe body extends into the inner cavity through the sleeve inlet, and the opening structure is provided corresponding to the opening position;

[0012] Assembling a switch valve, closing the gap between the sleeve inlet and the outer wall of the pipeline body, and connecting the inlet of the switch valve to the open hole structure;

[0013] Processing and opening a hole, maintaining the switch valve in an open state, opening a hole at the opening position of the pipeline body through the opening channel of the switch valve and the opening structure, and switching the switch valve to a closed state;

[0014] To replace the pipe section, keep the switch valve in a closed state, connect the replacement pipe section to the outlet of the switch valve, switch the switch valve to an open state, and complete the replacement operation.

[0015] Optionally, in the above-mentioned pipeline online replacement method, the step of setting the opening position includes:

[0016] A hole-opening fixing device is provided, wherein the hole-opening fixing device can extend into the inner cavity of the blocking device through the sleeve inlet, and the hole-opening fixing device has a hole reserved for the hole-opening;

[0017] The opening fixing device is sleeved on the outside of the pipeline body and fixed relatively to the pipeline body, and the opening reserved hole is arranged corresponding to the opening position of the pipeline body.

[0018] Optionally, in the above-mentioned online pipeline replacement method, when the hole-opening fixture is sleeved on the outside of the pipeline body, the inner wall of the hole-opening fixture is in contact with the outer wall of the pipeline body.

[0019] Optionally, in the above-mentioned pipeline online replacement method, the opening fixing device includes an upper half and a lower half that cooperate with each other, and the upper half and the lower half cooperate to form a space surrounding the pipeline body;

[0020] The opening reserved hole is located in the upper half.

[0021] Optionally, in the above-mentioned online pipeline replacement method, the outer wall of the hole-opening fixing device is gap-matched with the inner cavity of the blocking device.

[0022] Optionally, in the above-mentioned pipeline online replacement method, in the step of cutting off the pipeline, hydraulic pliers are used to flatten the position between the pipe section to be replaced and the pipeline body so that the inner wall of the pipeline is in contact and closed, and then the other areas of the pipe section to be replaced except the flattened area are cut off.

[0023] Optionally, in the above-mentioned pipeline online replacement method, in the step of setting a plugging device, the plugging device further comprises a pressure relief hole penetrating the inner cavity and the outer wall of the plugging device;

[0024] Before the pipe section is replaced, the step also includes sealing the pressure relief flow hole.

[0025] Optionally, in the above-mentioned online pipeline replacement method, the pressure relief flow hole is located at an end of the sealing device facing away from the sleeve inlet.

[0026] Optionally, in the above-mentioned pipeline online replacement method, the pressure relief flow hole is a threaded hole.

[0027] Optionally, in the above-mentioned pipeline online replacement method, in the step of assembling a switch valve, the switch valve is a ball valve.

[0028] It can be seen from the above technical solutions that the online pipeline replacement method provided by the present invention realizes the operation of online pipeline replacement, avoiding the problems of short service life and frequent repeated leakage defects caused by simply plugging the leakage point, and there is no need to stop the machine for pipeline replacement, which facilitates the operation of pipeline replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of a process flow of a pipeline online replacement method provided by an embodiment of the present invention;

[0031] Figure 2 A schematic front view of a blocking device provided in an embodiment of the present invention;

[0032] Figure 3 A schematic top view of a blocking device provided in an embodiment of the present invention;

[0033] Figure 4 A left side schematic diagram of a blocking device provided by an embodiment of the present invention;

[0034] Figure 5 A schematic front view of a hole-opening fixing device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0035] The invention discloses a pipeline online replacement method to facilitate the operation of online pipeline replacement.

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] like Figure 1-Figure 5 As shown, an embodiment of the present invention provides a pipeline online replacement method, wherein the pipeline has a pipeline body 310 and a pipe section to be replaced arranged along its extension direction. The pipe section to be replaced is a pipe section with leakage defects such as cracks and sand holes. The pipeline online replacement method provided by the embodiment of the present invention requires removing the pipe section to be replaced in the pipeline and replacing it with a replacement pipe section to ensure the function of the pipeline.

[0038] The pipeline online replacement method provided by the embodiment of the present invention comprises the following steps:

[0039] S1: Setting the opening position: Setting the opening position on the outer wall of the pipe body 310;

[0040] The hole opening position is set at a position of the pipeline body 310 close to the pipe section to be replaced and at a predetermined distance from the pipe section to be replaced to avoid the hole opening operation affecting the hole opening position after the pipe section to be replaced is removed. The predetermined distance can be determined according to actual needs and is not specifically limited here.

[0041] S2: Cut off the pipeline, and press the position between the pipe section to be replaced and the pipeline body 310 by external force, so that the inner wall of the pipeline contacts and closes, and the pipe section to be replaced is cut off;

[0042] The position between the pipe section to be replaced and the pipe main body 310 may not be cut off, and the inner wall of the pipe can be kept in contact and closed, so that after the pipe section to be replaced is cut off, the pipe main body 310 forms a closed cut-off end toward the end of the pipe section to be replaced, thereby avoiding or reducing the overflow of the internal fluid of the pipe from the cut-off end of the pipe main body 310 as much as possible.

[0043] S3: a plugging device is provided, wherein the plugging device has an inner cavity 100, an inlet 101 for the cut-off end of the pipe body 310 to extend into the inner cavity 100, and an opening structure 102 that can correspond to the opening position; the cut-off end of the pipe body 310 extends into the inner cavity 100 through the inlet 101, and the opening structure 102 is provided corresponding to the opening position;

[0044] The opening structure 102 and the opening position can both be located above the pipe, that is, the opening position is set at the upward position of the pipe body 310. Of course, the opening position can also be set at the side of the pipe body 310 or at the downward position of the pipe body 310, which is not specifically limited here and depends on actual needs.

[0045] After the cut end of the pipe body 310 is inserted into the inner cavity 100 of the plugging device through the sleeve inlet 101, the relative position of the pipe body 310 and the plugging device is adjusted so that the opening structure 102 is set corresponding to the opening position, that is, the opening position can be opened by the opening structure 102.

[0046] S4: Assemble the switch valve, close the gap between the sleeve inlet 101 and the outer wall of the pipeline body 310, and connect the inlet of the switch valve to the open hole structure 102;

[0047] Through the gap between the sealing sleeve inlet 101 and the outer wall of the pipeline body 310, a switch valve is connected to the opening structure 102, so that when the switch valve is closed, the inner cavity 100 is a closed cavity.

[0048] S5: Processing and opening a hole, maintaining the switch valve in an open state, opening a hole at the opening position of the pipeline body 310 through the opening channel of the switch valve and the opening structure 102, and switching the switch valve to a closed state;

[0049] When the switch valve is maintained in the open state, the outlet of the switch valve is connected to the inlet of the switch valve, and a drilling device such as a drill can be inserted through the outlet of the switch valve to reach the opening position of the pipeline body 310, thereby facilitating the opening position of the pipeline body 310. When the opening is completed, the fluid in the pipeline body 310 will flow along the opening at the opening position toward the switch valve, and by switching the switch valve to the closed state, fluid overflow is effectively avoided.

[0050] S6: Replace the pipe section, keep the switch valve in the closed state, connect the replacement pipe section to the outlet of the switch valve, switch the switch valve to the open state, and complete the replacement operation.

[0051] The pipeline online replacement method provided in the embodiment of the present invention realizes the operation of online pipeline replacement, avoids the problems of short service life and frequent repeated leakage defects caused by simply plugging the leakage point, and does not require shutdown for pipeline replacement, which facilitates the operation of pipeline replacement.

[0052] The plugging device can be pre-processed or processed on site according to the actual pipeline structure.

[0053] Furthermore, step S1 of setting the opening position includes:

[0054] S11: a hole-opening fixing device 200 is provided, the hole-opening fixing device 200 can be extended into the inner cavity 100 of the plugging device through the sleeve inlet 101, and the hole-opening fixing device 200 has a hole-opening reserved hole 201;

[0055] S12: The hole-opening fixing device 200 is sleeved on the outside of the pipeline body 310 and fixed relatively to the pipeline body 310 , and the hole-opening reserved hole 201 is set corresponding to the hole position of the pipeline body 310 .

[0056] Through the above arrangement, the hole-opening fixing device 200 is located between the pipeline body 310 and the plugging device, supporting and reinforcing the pipeline body 310, and preventing the pipeline body 310 from shaking during the process of opening the hole position of the pipeline body 310. The hole-opening fixing device 200 can be a sleeve structure, the interior of which cooperates with the pipeline body 310, and the outer wall cooperates with the inner wall of the inner cavity 100 of the plugging device.

[0057] Specifically, when the hole-opening fixture 200 has not fully entered the inner cavity 100 of the plugging device, in step S4 of assembling the switch valve, the gap between the sealing sleeve inlet 101 and the outer wall of the pipeline body 310 includes: the gap between the sealing sleeve inlet 101 and the outer wall of the hole-opening fixture 200, and the gap between the sealing sleeve inlet 101 and the outer wall of the pipeline body 310.

[0058] In order to improve the fixing stability of the hole-opening fixture 200 on the pipe body 310 , when the hole-opening fixture 200 is sleeved on the outside of the pipe body 310 , the inner wall of the hole-opening fixture 200 contacts the outer wall of the pipe body 310 .

[0059] In the specific operation process, the outer diameter of the leaking pipeline (such as the top oil pipeline, etc.) can be measured on site, and the hole-opening fixture 200 can be processed accordingly.

[0060] In order to facilitate the assembly of the hole-opening fixture 200, the hole-opening fixture 200 includes an upper half 210 and a lower half 220 that cooperate with each other, and the upper half 210 and the lower half 220 cooperate to form a space surrounding the pipe body 310; the hole-opening reserved hole 201 is located in the upper half 210. Among them, the upper half 210 and the lower half 220 can both be provided with grooves, and when the upper half 210 and the lower half 220 are in a state of cooperative connection, the groove of the upper half 210 and the groove of the lower half 220 form a space surrounding the pipe body 310. Among them, the upper half 210 and the lower half 220 can be connected to the pipe body 310 separately by welding or the like, or after the upper half 210 and the lower half 220 are connected by welding or the like, the inner wall of the groove fits the outer wall of the pipe body 310, so as to achieve relative fixation of the pipe body 310, the upper half 210 and the lower half 220.

[0061] Of course, the hole-opening fixing device 200 can also be set as a sleeve structure, which is matched with the pipeline body 310 by sleeve setting, and the hole-opening fixing device 200 and the pipeline body 310 are connected by welding or other methods.

[0062] In order to facilitate the relative assembly of the opening fixing device 200 and the plugging device, the outer wall of the opening fixing device 200 is loosely matched with the inner cavity 100 of the plugging device. That is, the opening fixing device 200 can be inserted into the inner cavity 100 of the plugging device through the insertion inlet 101 of the plugging device.

[0063] Furthermore, in the step S2 of cutting off the pipeline, a hydraulic clamp is used to flatten the position between the pipe section to be replaced and the pipeline body 310, so that the inner wall of the pipeline is in contact and closed, and then the pipe section to be replaced is cut off except for the flattened area. Through the above arrangement, the sealing effect of the cut end of the pipeline body 310 is improved. Of course, it is also possible to cut off directly in the flattened area, which is not specifically limited here and is within the scope of protection.

[0064] In step S3 of setting up the blocking device, the blocking device further includes a pressure relief hole 103 penetrating the inner cavity 100 and the outer wall of the blocking device.

[0065] By applying external force to the position between the pipe section to be replaced and the pipe body 310, the inner wall of the pipe is contacted and closed, which has the risk of loose closure. This leads to leakage at the cut end of the pipe body 310. In order to avoid excessive leakage of fluid in the inner cavity 100 and affect subsequent operations, a pressure relief hole 103 is provided that penetrates the inner cavity 100 and the outer wall of the plugging device, so as to discharge the fluid flowing into the inner cavity 100 in time.

[0066] In addition, before processing the opening in step S5, the pressure relief hole 103 is also blocked. The pressure relief hole 103 can be blocked after the blocking device is set in step S3, and the pressure relief hole 103 is blocked when it is ensured that there is no leakage fluid or the leakage fluid in the inner cavity 100 is not enough to affect subsequent operations. Of course, the pressure relief hole 103 can also be blocked before completing the pipe section replacement in step S6.

[0067] In order to facilitate the operation of plugging the pressure relief hole 103 , the pressure relief hole 103 is located at the end of the plugging device facing away from the sleeve inlet 101 .

[0068] Preferably, the pressure relief hole 103 is a threaded hole. That is, during the operation of plugging the pressure relief hole 103, the matching bolt can be tightened with the pressure relief hole 103. In order to improve the plugging effect, the contact part between the bolt and the pressure relief hole 103 can be further welded.

[0069] In order to quickly close the opening channel of the switch valve to avoid excessive fluid overflow, in step S4, the switch valve is a ball valve. Of course, other types of valves can also be used as the switch valve, which is not specifically limited here and is within the scope of protection.

[0070] In the pipeline online replacement method of the present invention, the plugging device, the switch valve (and the opening fixing device 200) used can form an auxiliary component for pipeline online replacement. That is, the auxiliary component for pipeline online replacement includes a plugging device and a switch valve. The plugging device has an inner cavity 100, a sleeve inlet 101 and an opening structure 102. The sleeve inlet 101 can allow the cut-off end of the pipeline body 310 after the pipe section to be replaced to extend into the inner cavity 100, and the opening structure 102 can be set corresponding to the opening position of the pipeline body 310 extending into the inner cavity 100; the inlet of the switch valve can be connected to the opening structure 102, and the outlet of the switch valve can be connected to the replacement pipe section; when the opening structure 102 is set corresponding to the opening position of the pipeline body 310 and the switch valve is in an open state, the external drilling equipment can open a hole in the opening position of the pipeline body 310 through the opening channel of the switch valve and the opening structure 102.

[0071] The pipeline online replacement auxiliary component provided by the embodiment of the present invention can extend the truncated end of the pipeline body 310 into the inner cavity 100 from the sleeve inlet 101 during the pipeline online replacement process; when the opening structure 102 is set corresponding to the opening position of the pipeline and the switch valve is in the open state, the external drilling equipment can drill a hole in the opening position of the pipeline body 310 through the opening channel of the switch valve and the opening structure 102; after the hole is drilled at the opening position and the switch valve is in the closed state, the replacement pipe section can be connected to the outlet of the switch valve and the replacement operation can be completed by switching the switch valve to the open state. By using the pipeline online replacement auxiliary component provided by the embodiment of the present invention, the truncated end of the pipeline body 310 can be pressurized and sealed, and then the connection with the replacement pipe section can be achieved through the pipeline online replacement auxiliary component, so that the operation of online replacement of the pipeline can be realized, avoiding the problem of short service life and frequent repeated leakage defects caused by simply plugging the leakage point, and there is no need to stop the machine for pipeline replacement, which facilitates the operation of replacing the pipeline.

[0072] Among them, the blocking device and the switch valve can be in a connected state, that is, when the inlet of the switch valve is connected to the opening structure 102, the pipe section to be replaced is cut off and the cut end of the pipe body 310 is extended into the inner cavity 100, and then the gap between the sealing sleeve inlet 101 and the pipe is closed. Then, an external drilling equipment can be used to drill a hole at the opening position of the pipe body 310 through the opening channel of the switch valve and the opening structure 102. After the drilling is completed, the switch valve is closed. After the outlet of the switch valve can be connected to the replacement pipe section, the switch valve is opened to complete the operation of replacing the pipe.

[0073] Of course, the blocking device and the switch valve can also be in an unconnected state, that is, when the inlet of the switch valve and the opening structure 102 are in an unconnected state, the pipe section to be replaced is cut off and the cut end of the pipe body 310 is extended into the inner cavity 100, and then the gap between the inlet 101 of the sealing sleeve and the pipe is closed, and then the inlet of the switch valve and the opening structure 102 are installed, so that the switch valve remains in an open state to facilitate external drilling equipment to drill a hole at the opening position of the pipe body 310 through the opening channel of the switch valve and the opening structure 102, and the switch valve is closed after the drilling is completed. After the outlet of the switch valve can be connected to the replacement pipe section, the switch valve is opened to complete the operation of replacing the pipe.

[0074] It can be understood that the pipe whose pipe section needs to be replaced is the pipe body 310, and the cut-off end of the pipe body 310 is the cut-off end of the pipe.

[0075] In this embodiment, the opening structure 102 and the inlet of the switch valve can be connected by threads or interference fit, and can then be welded to form a closed structure.

[0076] Preferably, the inner cavity 100 has a first cavity portion 110 and a second cavity portion 120 that are interconnected, the first cavity portion 110 has an inlet 101, and the second cavity portion 120 is located at an end of the first cavity portion 110 that is away from the inlet 101;

[0077] The opening structure 102 is in communication with the first cavity portion 110, and the second cavity portion 120 is used to accommodate the fluid seeping from the cut-off end of the pipe body 310. In the event of leakage at the cut-off end of the pipe body 310, the second cavity portion 120 can accommodate the fluid seeping from the cut-off end to prevent the fluid from affecting the opening operation.

[0078] In this embodiment, the first cavity portion 110 can accommodate the pipe body 310 , and the truncated end of the pipe body 310 can be located in the first cavity portion 110 or extend into the second cavity portion 120 .

[0079] In some embodiments, the orthographic projection area of ​​the second cavity portion 120 toward the inlet 101 covers the orthographic projection area of ​​the first cavity portion 110 toward the inlet 101. Through the above arrangement, the position of the plugging device can be adjusted so that the second cavity portion 120 has an area lower than the first cavity portion 110, so that the fluid seeping from the cut end of the pipe body 310 can reach the second cavity portion 120 under the action of gravity, avoiding the fluid staying in the first cavity portion 110 and affecting the hole opening operation.

[0080] like Figure 5As shown, the pipeline online replacement auxiliary component provided by the embodiment of the present invention also includes a hole-opening fixing device 200, which can be extended into the inner cavity 100 of the plugging device through the sleeve inlet 101, and the hole-opening fixing device 200 has a hole-opening reserved hole 201 for being set corresponding to the hole-opening structure 102; the hole-opening fixing device 200 can be sleeved on the outside of the pipeline body 310 and fixed relatively to the pipeline body 310, and the hole-opening reserved hole 201 can be set corresponding to the hole position of the pipeline body 310.

[0081] Preferably, the outer wall of the opening fixing device 200 cooperates with the inner wall of the first cavity portion 110 , that is, the opening fixing device 200 is located in the first cavity portion 110 .

[0082] In this embodiment, the opening fixing device 200 can be a cylindrical structure, which has a channel running through both ends thereof. The inner wall of the channel cooperates with the outer wall of the pipeline body 310. The cylindrical structure can be arranged between the blocking device and the pipeline.

[0083] The inner wall of the hole-opening fixture 200 contacts the outer wall of the pipe body 310. That is, when the hole-opening fixture 200 is sleeved on the outside of the pipe body 310, the inner wall of the hole-opening fixture 200 contacts the outer wall of the pipe body 310. Through the above arrangement, the stability of the relative fixation between the hole-opening fixture 200 and the pipe body 310 is effectively improved, thereby reducing the shaking degree of the pipe during the pipe hole-opening process, and effectively improving the accuracy of the hole-opening position.

[0084] In order to facilitate the assembly of the opening fixture 200 and the pipeline, the opening fixture 200 includes an upper half 210 and a lower half 220 that cooperate with each other, and the upper half 210 and the lower half 220 cooperate to form a space surrounding the pipeline body 310; the opening reserved hole 201 is located in the upper half 210. Of course, the opening reserved hole 201 can also be located in the lower half 220.

[0085] Of course, the opening fixing device 200 can also be provided as a left half and a right half.

[0086] Through the above arrangement, the hole-opening fixture 200 can be installed on the pipeline body 310 before the pipeline is cut off and the pipe section needs to be replaced, and then the pipeline is cut off. Of course, the hole-opening fixture 200 can also be installed after the pipeline is cut off.

[0087] In order to facilitate the discharge of leaked fluid in the inner cavity 100 of the plugging device, the plugging device further includes a pressure relief hole 103 penetrating the inner cavity 100 and the outer wall of the plugging device, and the pressure relief hole 103 can be blocked.

[0088] Furthermore, the pressure relief hole 103 is located at the end of the plugging device facing away from the sleeve inlet 101. In this embodiment, the second cavity portion 120 is located at the end of the first cavity portion 110 facing away from the sleeve inlet 101, so the pressure relief hole 103 is connected to the second cavity portion 120.

[0089] Preferably, the hole wall of the pressure relief hole 103 and the side wall of the second cavity portion 120 have an aligned portion. Therefore, by adjusting the position of the plugging device, the side wall area of ​​the second cavity portion 120 aligned with the hole wall of the pressure relief hole 103 can be located at the lowest end of the second cavity portion 120, so that the leaked fluid can be discharged from the second cavity portion 120 through the pressure relief hole 103 under the action of gravity, and ensure that the leaked fluid in the second cavity portion 120 can be completely discharged.

[0090] Of course, the pressure relief hole 103 may also be arranged at other positions, and the leaked fluid in the inner cavity 100 of the plugging device may be discharged through an external suction device (such as a water pump, etc.).

[0091] In order to facilitate the plugging operation of the pressure relief hole 103, the pressure relief hole 103 is a threaded hole. That is, during the operation of plugging the pressure relief hole 103, the matching bolts can be tightened in coordination with the pressure relief hole 103. In order to improve the plugging effect, the contact portion between the bolt and the pressure relief hole 103 can be further welded.

[0092] The pressure relief hole 103 may be sealed simply by interference fit between the plug and the pressure relief hole 103, or may be sealed only by solder filling.

[0093] Preferably, in order to quickly close the opening channel of the switch valve to avoid excessive fluid overflow, the switch valve is a ball valve. Of course, other types of valves can also be used as the switch valve, which is not specifically limited here and is within the scope of protection.

[0094] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0095] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for online replacement of a pipeline, wherein the pipeline has a pipeline body and a pipe section to be replaced arranged along its extension direction, characterized in that: Includes steps: Setting the opening position, setting the opening position on the outer wall of the pipe body; Cut off the pipeline, and press the position between the pipe section to be replaced and the pipeline body by external force, so that the inner wall of the pipeline contacts and closes, and cuts off the pipe section to be replaced; A plugging device is provided, the plugging device having an inner cavity, a sleeve inlet for the truncated end of the pipe body to extend into the inner cavity, and an opening structure that can correspond to the opening position; the truncated end of the pipe body extends into the inner cavity through the sleeve inlet, and the opening structure is provided corresponding to the opening position; Assembling a switch valve, closing the gap between the sleeve inlet and the outer wall of the pipeline body, and connecting the inlet of the switch valve to the open hole structure; Processing and opening a hole, maintaining the switch valve in an open state, opening a hole at the opening position of the pipeline body through the opening channel of the switch valve and the opening structure, and switching the switch valve to a closed state; To replace the pipe section, keep the switch valve in a closed state, connect the replacement pipe section to the outlet of the switch valve, switch the switch valve to an open state, and complete the replacement operation.

2. The pipeline online replacement method according to claim 1, characterized in that: The step of setting the opening position includes: A hole-opening fixing device is provided, wherein the hole-opening fixing device can extend into the inner cavity of the blocking device through the sleeve inlet, and the hole-opening fixing device has a hole reserved for the hole-opening; The opening fixing device is sleeved on the outside of the pipeline body and fixed relatively to the pipeline body, and the opening reserved hole is arranged corresponding to the opening position of the pipeline body.

3. The pipeline online replacement method according to claim 2, characterized in that: When the hole-opening fixing device is sleeved on the outside of the pipe body, the inner wall of the hole-opening fixing device contacts the outer wall of the pipe body.

4. The pipeline online replacement method according to claim 2, characterized in that: The opening fixing device comprises an upper half and a lower half which cooperate with each other, and the upper half and the lower half cooperate to form a space surrounding the pipe body; The opening reserved hole is located in the upper half.

5. The pipeline online replacement method according to claim 2, characterized in that: The outer wall of the opening fixing device is gap-matched with the inner cavity of the blocking device.

6. The pipeline online replacement method according to claim 1, characterized in that: In the step of cutting off the pipeline, hydraulic pliers are used to flatten the position between the pipe section to be replaced and the pipeline body, so that the inner wall of the pipeline is in contact and closed, and then the other area of ​​the pipe section to be replaced except the flattened area is cut off.

7. The pipeline online replacement method according to claim 1, characterized in that: In the step of setting up the plugging device, the plugging device further comprises a pressure relief hole penetrating the inner cavity and the outer wall of the plugging device; Before the pipe section is replaced, the step also includes sealing the pressure relief flow hole.

8. The pipeline online replacement method according to claim 7, characterized in that: The pressure relief and flow discharge hole is located at an end of the blocking device facing away from the sleeve inlet.

9. The pipeline online replacement method according to claim 7, characterized in that: The pressure relief flow hole is a threaded hole.

10. The pipeline online replacement method according to claim 1, characterized in that: In the steps of assembling the switch valve, the switch valve is a ball valve.

Images