A pressure testing device for plastically deformable pipes

Abstract

The application provides a pressure testing device for a plastically deformable pipeline, which comprises two sealing heads for sealing the pipeline and two trumpet-shaped sleeves for preventing stress concentration of the pipeline during pressure testing expansion, the two sealing heads are respectively and sealingly installed on the inner sides of two ends of the pipeline, the two trumpet-shaped sleeves are respectively arranged on the outer sides of the two ends of the pipeline, the large-diameter end of the trumpet-shaped sleeve is arranged close to the middle part of the pipeline, and the end face of the small-diameter end of the trumpet-shaped sleeve is aligned with or coincides with the inner side end face of the sealing head. The application has the advantages of convenient disassembly and assembly, convenient and reliable large deformation blasting experiment, etc.

Description

Technical Field

[0001] This invention relates to the field of pipeline pressure testing, and more particularly to a pressure testing device for plastically deformable pipelines. Background Technology

[0002] Currently, deformable plastic pipes such as polyethylene and polypropylene are widely used in oil and gas transportation and other fields due to their advantages such as reliable connections, low-temperature impact resistance, stress cracking resistance, and good chemical corrosion resistance. To ensure the reliability and safety of deformable plastic pipes, a burst pressure test must be conducted before use to determine if the pipe has sufficient load-bearing capacity. Existing pressure tests for deformable plastic pipes typically involve sealing the pipe end with a fusion-welded flange and then using a blind flange. Because the flange at the pipe end requires fusion welding, the operation is complex; and due to the constraint of the blind flange at the pipe end, the pipe is prone to uneven deformation, making effective burst testing impossible. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a pressure testing device for a plastic deformation pipeline that is easy to assemble and disassemble and can be conveniently and reliably used for large deformation bursting experiments.

[0004] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows:

[0005] A pressure testing device for a plastically deformable pipe includes two plugging heads for sealing the pipe and two flared sleeves for preventing stress concentration during pipe expansion during pressure testing. The two plugging heads are respectively sealed and installed on the inner sides of both ends of the pipe; the two flared sleeves are respectively disposed on the outer sides of both ends of the pipe, with the large-diameter end of the flared sleeve being located close to the middle of the pipe, and the end face of the small-diameter end of the flared sleeve being aligned with or overlapping the inner end face of the plugging head.

[0006] As a further improvement to the above technical solution:

[0007] The pressure testing device also includes fastening clamps fitted on the outer sides of both ends of the pipe. The outer surface of the plug head located on the pipe section is provided with clamping teeth, and the pipe is clamped to the clamping teeth under the force of the fastening clamps.

[0008] A sealing component is provided between the plug and the pipe to prevent the medium inside the pipe from leaking out. The sealing component is located on the side of the clamping tooth near the middle of the pipe.

[0009] Each plug position has at least two fastening clamps, which are arranged at intervals along the axial direction of the pipeline.

[0010] The pressure testing device also includes a tensile simulation component that provides axial tension in the pipeline during water injection. The tensile simulation component includes a fixed rod, a movable rod, an upper mounting plate, and a lower mounting plate. The upper mounting plate and the lower mounting plate are respectively disposed on the upper and lower sides of the pipeline. The fixed rod passes through one of the sealing heads and is mounted on the upper and lower mounting plates at both ends. The upper mounting plate and the lower mounting plate are provided with grooves arranged along the length of the pipeline. The movable rod passes through the other sealing head and is slidably disposed at both ends in the grooves located on the upper and lower mounting plates.

[0011] The pressure testing device also includes a bending simulation component that provides bending force to the pipeline. The bending simulation component includes a drive rod that drives a plug head located at a fixed rod position to swing horizontally. The drive rod is horizontally arranged and connected to the plug head through a connecting lug.

[0012] The plug head located at the moving rod position is equipped with a fixing component for fixing the plug head when the simulated pipeline is not under axial load. The fixing component includes a screw, a nut screwed to the screw, and a rotating handle located at one end of the screw. The nut is fixedly installed. When the plug head needs to be fixed, one end of the screw is rotated to press against the plug head.

[0013] The pressure testing device also includes an exhaust assembly for venting gas from the pipe when water is injected into the pipe. The exhaust assembly includes a float, an exhaust hose, an air inlet pipe, and a vent valve. The float is located inside the pipe and connected to one end of the exhaust hose. The other end of the exhaust hose is located outside the plug. The air inlet pipe is located inside the float and communicates with the exhaust hose. The vent valve is located at the exhaust end of the exhaust hose.

[0014] The pressure testing device also includes an exhaust assembly for venting gas from the pipe when water is injected into the pipe. The exhaust assembly includes an L-shaped exhaust pipe and an exhaust switch valve. The L-shaped exhaust pipe is located above the end plate of the plug head and communicates with the inside of the pipe. The exhaust switch valve is located on the L-shaped exhaust pipe.

[0015] The sealing head, located away from the exhaust assembly, is provided with a water injection port for injecting water into the pipeline for pressure testing, and a water injection switch valve is provided at the water injection port.

[0016] Compared with the prior art, the advantages of the present invention are as follows:

[0017] The pressure testing device of this invention includes a sealing head and a flared sleeve. The sealing head is sealed and installed on the inner side of both ends of the pipeline, allowing for quick assembly and disassembly of the sealing components. This avoids the inconvenience and cumbersome operation of disassembling and assembling welded flanges at the pipeline ends, resulting in high assembly and disassembly efficiency and making pipeline sampling and testing more convenient. Simultaneously, the flared sleeve is positioned on the outer side of both ends of the pipeline, with the large-diameter end of the flared sleeve located near the middle of the pipeline. This ensures that the pipeline deforms in a coordinated manner under the constraint of the flared sleeve during pressure testing and expansion, effectively preventing stress concentration during pipeline expansion and facilitating reliable and large deformation burst tests. Furthermore, the end face of the small-diameter end of the flared sleeve is aligned with or overlaps with the inner end face of the sealing head to prevent the pipeline from bulging under pressure in non-test areas, ensuring reliable and safe pipeline pressure testing. The pressure testing device of this invention has a simple and compact structure, occupies little space, and is low in cost. Attached Figure Description

[0018] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0020] Figure 2 yes Figure 1 A sectional view of section AA.

[0021] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0022] The labels in the diagram represent:

[0023] 1. Sealing head; 11. Clamping tooth; 12. Water inlet; 2. Trumpet-shaped sleeve; 3. Pipe; 4. Fastening clamp; 5. Sealing component; 6. Tension simulation component; 61. Fixed rod; 62. Moving rod; 63. Upper mounting plate; 64. Lower mounting plate; 65. Slide groove; 66. Column; 7. Bending simulation component; 71. Drive rod; 72. Connecting lug; 8. Fixing component; 81. Screw; 82. Nut; 83. Rotating handle; 9. Exhaust component; 91. Float; 92. Exhaust hose; 93. Air inlet pipe; 94. Vent valve; 95. L-shaped exhaust pipe; 96. Exhaust switch valve; 10. Water inlet switch valve. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments, but this does not limit the scope of protection of the present invention.

[0025] Example 1

[0026] Figure 1 and Figure 2An embodiment of the pressure testing device for the deformable pipe of the present invention is shown. This device is used to perform a burst pressure test on pipe 3 to test its load-bearing capacity. In this embodiment, the pressure testing device for the deformable pipe includes two sealing heads 1 and two flared sleeves 2. The two sealing heads 1 are respectively sealed and installed on the inner sides of both ends of pipe 3 to seal it. The sealing heads 1 allow for quick assembly and disassembly of the sealing components, avoiding the inconvenience and cumbersome operation of disassembling and assembling the welded flanges at the ends of pipe 3. This high assembly and disassembly efficiency makes sampling and testing of pipe 3 more convenient.

[0027] Meanwhile, two flared sleeves 2 are respectively positioned on the outer sides of both ends of the pipe 3, with the larger diameter end of the flared sleeve 2 located close to the middle of the pipe 3. This ensures that the pipe 3 deforms in a coordinated manner under the constraint of the flared sleeves 2 during pressure testing and expansion, effectively preventing stress concentration during pipe 3 expansion and facilitating reliable and large deformation burst tests. Furthermore, the end face of the smaller diameter end of the flared sleeve 2 is aligned with or overlaps with the inner end face of the sealing head 1 to prevent the pipe 3 from bulging under pressure in non-test areas, ensuring the reliable and safe conduct of the pressure test on the pipe 3. The pressure testing device of this invention has a simple and compact structure, occupies little space, and is low in cost.

[0028] Furthermore, the pressure testing device for the deformable pipe also includes a fastening clamp 4. The fastening clamp 4 is fitted onto the outer sides of both ends of the pipe 3. The outer surface of the portion of the plug head 1 located on the pipe 3 is provided with clamping teeth 11. Under the force of the fastening clamp 4, the pipe 3 is clamped to the clamping teeth 11, which effectively fixes the plug head 1 and facilitates the axial movement of the pipe 3 by the plug head 1, simulating the working condition of the pipe 3 under axial load. At the same time, the clamping of the pipe 3 to the clamping teeth 11 has a sealing effect to prevent the leakage of the medium inside the pipe 3 and ensure the pressure test effect. Furthermore, the clamping teeth 11 are arranged facing both ends of the pipe 3 to facilitate the installation of the plug head 1.

[0029] In this embodiment, the inner diameter of the fastening clamp 4 is smaller than the outer diameter of the pipe 3 to provide radial fastening force and ensure the pressure test effect. There are two fastening clamps 4 at each sealing head 1 position, spaced apart axially along the pipe 3. In other embodiments, the number of fastening clamps 4 at each sealing head 1 position can be adjusted according to actual conditions, such as setting them to three, four, etc.

[0030] Furthermore, a sealing component 5 is provided between the plug head 1 and the pipe 3. The sealing component 5 is located on the side of the clamping tooth 11 near the middle of the pipe 3 to further prevent the medium inside the pipe 3 from leaking out and to ensure the pressure test effect. In this embodiment, the sealing component 5 is a sealing ring.

[0031] Furthermore, such as Figure 1As shown, the pressure testing device for the plastically deformable pipeline also includes a tensile simulation component 6, which comprises a fixed rod 61, a movable rod 62, an upper mounting plate 63, and a lower mounting plate 64. The upper mounting plate 63 and the lower mounting plate 64 are respectively located on the upper and lower sides of the pipeline 3. The fixed rod 61 passes through one of the sealing plugs 1, and both ends of the fixed rod 61 are mounted on the upper mounting plate 63 and the lower mounting plate 64. The upper mounting plate 63 and the lower mounting plate 64 are provided with sliding grooves 65, which are arranged along the length of the pipeline 3. The movable rod 62 passes through the other sealing plug 1, and both ends of the movable rod 62 slide within the sliding grooves 65 located on the upper mounting plate 63 and the lower mounting plate 64. Its structure is simple and compact, and occupies little space.

[0032] When water is injected into the pipe 3, the plug head 1, which is fitted with a moving rod 62, moves along the axial direction of the pipe 3 through the sliding groove 65 under the action of water injection pressure. At this time, the plug head 1 generates an axial tension on the pipe 3 to simulate the working state of the pipe 3 under axial tension and internal pressure, so as to meet the simulation requirements of different working conditions of the pipe 3.

[0033] In this embodiment, the magnitude of the axial tensile force of the pipe 3 is determined based on the internal pressure of the pipe 3 and the internal cross-sectional area of ​​the pipe 3, that is, the axial tensile force of the pipe 3 is equal to the internal pressure of the pipe 3 multiplied by the internal cross-sectional area of ​​the pipe 3.

[0034] like Figure 1 As shown, the sealing head 1 located at the position of the moving rod 62 is equipped with a fixing component 8, which includes a screw 81, a nut 82, and a rotating handle 83. The nut 82 is fixedly installed and screwed to the screw 81; the rotating handle 83 is located at one end of the screw 81 to facilitate the rotational force of the screw 81; the other end of the screw 81 faces the sealing head 1. When simulating the pipe 3 being unloaded axially, the screw 81 rotates to press against the sealing head 1. At this time, the sealing head 1 is fixed in position under the water injection pressure and no longer moves. The sealing head 1 will not exert axial tension on the pipe 3, thus simulating the condition where the pipe 3 is not under axial load. The fixing component 8 of this invention has a simple structure and occupies little space.

[0035] Furthermore, the upper mounting plate 63 and the lower mounting plate 64 are connected by columns 66, and a crossbar is provided between the two columns 66. The central axis of the crossbar coincides with the central axis of the plug head 1, and the nut 82 is fixed on the crossbar, which enables the screw 81 to provide a uniform centering force to the plug head 1 when the pipeline 3 is not under axial load, ensuring the reliable positioning of the plug head 1.

[0036] In this embodiment, the pressure testing device for the plastically deformable pipe further includes a bending simulation component 7, which includes a drive rod 71. The drive rod 71 is horizontally arranged and connected to the sealing head 1 via a connecting lug 72. The drive rod 71 can lengthen the lever arm and reduce the force, facilitating the horizontal swing of the sealing head 1. In other embodiments, the bending simulation component 7 only needs to be able to drive the sealing head 1 to swing horizontally, such as manually driving the sealing head 1 to swing horizontally.

[0037] When simulating the working state of pipe 3 bending under internal pressure, the drive rod 71 drives the plug head 1 to swing horizontally around the fixed rod 61. At this time, the plug head 1 provides the bending force of pipe 3, causing pipe 3 to bend. At the same time, when pipe 3 bends, the moving rod 62 moves to give pipe 3 bending deformation space, which ensures the reliable simulation of pipe 3 bending under internal pressure.

[0038] This invention employs a combination of a tension simulation component 6, a bending simulation component 7, and a fixing component 8, enabling simultaneous and individual simulations of the axial tension and bending states of the pipeline 3. It achieves realistic simulations of different operating conditions of the pipeline 3, demonstrating strong versatility; furthermore, its overall structure is simple, compact, and occupies little space.

[0039] like Figure 1 As shown, the pressure testing device for the plastically deformable pipe also includes an exhaust assembly 9, which includes a float 91, an exhaust hose 92, an air inlet pipe 93, and a vent valve 94. The float 91 is located inside the pipe 3 and connected to one end of the exhaust hose 92. The float 91 is positioned so that during water injection, the air inlet end of the exhaust hose 92 floats at the top of the pipe 3, ensuring that most of the air in the pipe 3 is effectively discharged, guaranteeing the safety and reliability of the pressure test. The other end of the exhaust hose 92 is located outside the sealing head 1 to discharge gas from the pipe 3 during water injection. The air inlet pipe 93 is located inside the float 91 and connects to the exhaust hose 92, facilitating the transfer of gas from the pipe 3 to the exhaust hose 92 for discharge. The vent valve 94 is located at the exhaust end of the exhaust hose 92 to control the opening and closing of the exhaust hose 92.

[0040] In this embodiment, a water inlet 12 is provided on the sealing head 1 away from the exhaust assembly 9, and a water injection switch valve 10 is provided at the water inlet 12 to facilitate water injection and pressure testing into the pipeline 3.

[0041] In this embodiment, the operation method of the pressure testing device for the plastically deformable pipe is as follows: When a pressure test of pipe 3 is required, water is injected into pipe 3 by opening the water injection valve 10. At the same time, the vent valve 94 is opened, and the air inside pipe 3 is discharged through the vent hose 92. The pressure test can be carried out when the air inside pipe 3 is discharged and it is filled with water. During the pressure test, the vent valve 94 is closed and pressure is applied to pipe 3. At this time, the middle part of pipe 3 expands outward along the trumpet-shaped sleeve 2. When the preset internal pressure is reached, it is observed whether pipe 3 bursts to test the load-bearing capacity of pipe 3.

[0042] Example 2

[0043] Figure 3 Another embodiment of the pressure testing device for a plastically deformable pipe of the present invention is shown. This embodiment is basically the same as the previous embodiment, except that the venting assembly 9 in this embodiment includes an L-shaped vent pipe 95 and an venting valve 96. The L-shaped vent pipe 95 is located above the end plate of the sealing head 1 and communicates with the inside of the pipe 3; the venting valve 96 is located on the L-shaped vent pipe 95. During water injection pressure testing, one end of the pressure testing device with the venting assembly 9 is raised, and the venting valve 96 is opened, so that the air in the pipe 3 can be discharged through the L-shaped vent pipe 95. This can remove most of the air in the pipe 3, ensuring the safety and reliability of the pressure test.

[0044] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A pressure testing device for a plastically deformable pipe, characterized in that, The device includes two plugging heads for sealing the pipe and two flared sleeves for preventing stress concentration during pipe expansion during pressure testing. The two plugging heads are respectively sealed and installed on the inner sides of both ends of the pipe; the two flared sleeves are respectively disposed on the outer sides of both ends of the pipe, with the large-diameter end of the flared sleeve being located close to the middle of the pipe, and the end face of the small-diameter end of the flared sleeve being aligned with or overlapping the inner end face of the plugging head. It also includes fastening clamps fitted on the outside of both ends of the pipe, and the outer surface of the plug head located on the pipe section is provided with clamping teeth, and the pipe is clamped to the clamping teeth under the force of the fastening clamps; A sealing component is provided between the plug and the pipeline to prevent leakage of the medium inside the pipeline.

2. The pressure testing device for a plastically deformable pipe according to claim 1, characterized in that, The sealing component is located on the side of the clamping tooth near the middle of the pipe.

3. The pressure testing device for a plastically deformable pipe according to claim 1, characterized in that, Each plug position has at least two fastening clamps, which are arranged at intervals along the axial direction of the pipeline.

4. The pressure testing apparatus for a plastically deformable pipe according to any one of claims 1 to 3, characterized in that, It also includes a tension simulation component that provides axial tension in the pipeline during water injection. The tension simulation component includes a fixed rod, a movable rod, an upper mounting plate, and a lower mounting plate. The upper mounting plate and the lower mounting plate are respectively disposed on the upper and lower sides of the pipeline. The fixed rod passes through one of the sealing heads and is mounted on the upper and lower mounting plates at both ends. The upper mounting plate and the lower mounting plate are provided with grooves arranged along the length of the pipeline. The movable rod passes through the other sealing head and is slidably disposed at both ends in the grooves located on the upper and lower mounting plates.

5. The pressure testing device for a plastically deformable pipe according to claim 4, characterized in that, It also includes a bending simulation component that provides pipe bending force, the bending simulation component including a drive rod that drives a plug head located at a fixed rod position to swing horizontally, the drive rod being arranged horizontally and connected to the plug head via a connecting lug.

6. The pressure testing device for a plastically deformable pipe according to claim 4, characterized in that, The plug head located at the moving rod position is equipped with a fixing component for fixing the plug head when the simulated pipeline is not under axial load. The fixing component includes a screw, a nut screwed to the screw, and a rotating handle located at one end of the screw. The nut is fixedly installed. When the plug head needs to be fixed, one end of the screw is rotated to press against the plug head.

7. The pressure testing apparatus for a plastically deformable pipe according to any one of claims 1 to 3, characterized in that, It also includes an exhaust assembly for discharging gas from the pipe when water is injected into the pipe. The exhaust assembly includes a float, an exhaust hose, an air inlet pipe, and a vent valve. The float is located inside the pipe and connected to one end of the exhaust hose. The other end of the exhaust hose is located outside the plug. The air inlet pipe is located inside the float and communicates with the exhaust hose. The vent valve is located at the exhaust end of the exhaust hose.

8. The pressure testing apparatus for a plastically deformable pipe according to any one of claims 1 to 3, characterized in that, It also includes an exhaust assembly for discharging gas from the pipe when water is injected into the pipe. The exhaust assembly includes an L-shaped exhaust pipe and an exhaust switch valve. The L-shaped exhaust pipe is located above the end plate of the plug head and communicates with the inside of the pipe. The exhaust switch valve is located on the L-shaped exhaust pipe.

9. The pressure testing device for a plastically deformable pipe according to claim 8, characterized in that, The sealing head, located away from the exhaust assembly, is provided with a water injection port for injecting water into the pipeline for pressure testing, and a water injection switch valve is provided at the water injection port.

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