A single-port water pressure testing device for pipelines and its usage method

Abstract

This invention relates to the field of pipeline testing technology, and more particularly to a single-port hydrostatic testing device for pipelines and its method of use. The device includes an annular support with a groove on its outer wall, within which an annular airbag is nested. It also includes an inflation port and a water injection port. The annular airbag has multiple rings of protrusions spaced axially on its outer circumference, each protrusion surrounding the circumference of the airbag. After inflation, the protrusions press against the pipe wall of the pipeline under test, forming a closed hydrostatic testing area. The inflation port is located on the annular airbag to connect it to an air source. The water injection port radially penetrates the annular support and the annular airbag to connect the hydrostatic testing area to a water source. This invention effectively solves the technical problems of high water consumption and cost in existing whole-pipe pressure testing, as well as the inability to accurately locate leaks, leading to rework, excavation, and extended construction periods.

Description

Technical Field

[0001] This invention relates to the field of pipeline testing technology, and in particular to a single-port hydraulic pressure testing device for pipelines and its usage method. Background Technology

[0002] According to the requirements of GB50268-2008 "Code for Construction and Acceptance of Water Supply and Drainage Pipeline Engineering", the water pressure test is a mandatory functional inspection step before the pressure pipeline is put into operation after installation. By pressurizing the laid pipeline with full water, the structural integrity and sealing performance of the pipeline under the specified pressure value are tested. The core judgment indicators are the allowable pressure drop and the allowable leakage within the specified pressure holding time.

[0003] Currently, pressure testing of pipelines generally adopts a segmented pressure testing method, where a certain length of the installed pipeline is selected as the test unit. Sealing devices are installed at both ends of the pipeline to form a closed cavity. Water is filled into the cavity, and the pressure is gradually increased to the design test pressure. Strength and tightness tests are conducted in stages, and the pipeline's qualification is determined by monitoring pressure changes during the pressure stabilization phase. For example, patent document CN223107478U discloses a device for pressure testing of large-diameter water transmission pipelines. This device includes a circular frame with grooves on its outer wall, a sealing plate fixed to the circular frame, a hollow annular air bladder embedded in the groove, and a rib assembly fixed to the circular frame and the sealing plate. The annular air bladder is equipped with an inflation pipe with a valve and an inflation connector. In use, two sets of this device are placed at both ends of the test pipeline section. Inflating the annular air bladder to make it adhere tightly to the inner wall of the pipeline achieves radial sealing. Combined with the sealing plate, this completes the axial sealing of the pipeline end face, thereby forming a closed pressure testing cavity for pressure testing.

[0004] However, the above-mentioned whole-pipe pressure testing method has the following shortcomings in practical applications: Firstly, the test chamber of the whole-pipe pressure testing is the entire internal space of the pipe section to be tested. The test requires the entire pipe section to be completely filled with water before test pressure can be established. The water consumption of a single test is directly related to the pipe diameter and the length of the test pipe section. The larger the pipe diameter, the greater the corresponding water consumption, which is difficult to implement in areas with relatively scarce water resources. It also causes unnecessary water consumption and increases the construction cost. Secondly, the whole-pipe pressure testing can only determine the overall sealing status of the entire closed pipe section and cannot accurately locate the specific leak point. When the pressure drop exceeds the standard or the leakage does not meet the specifications during the test, it can only confirm that there is a leakage defect in the pipe section, but it cannot determine which interface or part of the pipe body the defect occurs at. To locate the leak, the entire pipeline needs to be excavated, and each interface needs to be disassembled, inspected, adjusted, and retested. The rework process involves a large amount of earthwork excavation, pipeline disassembly and retesting, which not only increases the workload and extends the construction period, but also causes the test water already injected into the pipeline to be lost, further exacerbating the waste of water resources. Summary of the Invention

[0005] This invention provides a single-port hydraulic pressure testing device for pipelines to solve the technical problems of high water consumption and cost in the existing whole-pipe pressure testing, as well as the inability to accurately locate the leak point, which leads to rework and extended construction period. The purpose of this invention is also to provide a method for using the single-port hydraulic pressure testing device for pipelines.

[0006] To solve the above problems, the single-port water pressure testing device for pipelines provided by this invention adopts the following technical solution:

[0007] A single-port hydrostatic testing device for pipelines includes an annular support with a groove on its outer wall, within which an annular airbag is nested. It also includes an inflation port and a water injection port. The annular airbag has multiple rings of protrusions spaced axially on its outer circumference, each protrusion surrounding the circumference of the airbag. When the annular airbag is inflated, each protrusion presses against the pipe wall of the pipeline under test, forming a closed hydrostatic testing area together with the pipe wall. The inflation port is located on the annular airbag to connect it to an air source. The water injection port radially penetrates the annular support and the annular airbag to connect the hydrostatic testing area to a water source.

[0008] The beneficial effects of the single-port hydrostatic testing device for pipelines provided by this invention are: To address the issues of high water consumption and engineering costs associated with whole-pipe pressure testing, this application utilizes a ring-shaped support as a structural framework, nesting a ring-shaped airbag within a groove on the outer wall of the support. Multiple rings of axially spaced protrusions are arranged on the outer circumference of the airbag. When compressed gas is injected into the ring-shaped airbag through the inflation port, the airbag expands radially, and the multiple rings of protrusions on its outer circumference press against the inner wall of the pipe under test, together with the inner wall of the pipe, enclosing a closed annular water pressure test area covering only a single interface. At this point, the volume of the test chamber is reduced from the entire internal space of the pipe section to a ring-shaped water pressure test area, reducing water consumption and lowering material and labor costs for water injection and drainage, making it suitable for construction scenarios with various water resource conditions.

[0009] In addition, after inflation, the total expansion force inside the annular airbag is concentrated on the protrusion. The contact area between the protrusion and the inner wall of the pipe under test is small, which can generate greater contact stress under the same air pressure. This can form a high-strength linear sealing band on the inner wall of the pipe under test, enhance the sealing effect of the water pressure test area, reduce the amount of water leakage during the water pressure test, and thus reduce the water demand of the water pressure test.

[0010] To address the issues of inaccurate leak location during whole-pipe pressure testing, the large amount of rework and excavation required, and extended construction periods, this application refines the pressure testing unit from the entire pipeline to a designated local area within the pipe. The testing range can be limited by adjusting the device position, allowing for sealing performance testing of a single pipe joint or strength and tightness testing of a single pipe weld or local section. When pressure drop exceeds the standard or leakage is insufficient during the test, the leak defect can be directly determined to be located within the currently enclosed local test area, eliminating the need for extensive excavation and point-by-point inspection of the entire pipeline, thus achieving precise leak location. During rework and repair, only the local area where the defect is located needs to be excavated, without draining the water from the entire pipeline or removing all sealing devices. After repair, only the local area needs to be pressure tested again, reducing the amount of earthwork excavation, pipeline disassembly and reassembly, and repeated testing, effectively shortening the overall construction period, and avoiding the repeated waste of water resources caused by rework of the entire pipeline.

[0011] In summary, the present invention effectively solves the technical problems of high water consumption and high cost in the prior art for whole-pipe pressure testing, as well as the inability to accurately locate the leak point, which leads to rework and excavation and extended construction period.

[0012] Furthermore, the number of the inflation ports is not less than one.

[0013] Beneficial effects: The evenly distributed multiple inflation ports along the circumference of the annular support allow for simultaneous inflation of the annular airbag at multiple points. This effectively shortens the gas diffusion path around the annular airbag, avoiding uneven pressure distribution and asynchronous expansion caused by the large circumferential size of the annular airbag during single-point inflation. It ensures uniform and consistent pressure on the raised sections around the annular airbag along the entire circumference of the pipe wall, eliminating weak points in local sealing, improving the overall sealing reliability of the hydrostatic test area, and preventing local leakage from interfering with the accuracy of test data. Simultaneously, multi-point air intake improves the inflation efficiency of the annular airbag, shortens the inflation preparation time, and enhances the overall operational efficiency of single-port hydrostatic testing. It is particularly suitable for testing large-diameter pipelines, effectively reducing on-site construction time costs and workload.

[0014] Furthermore, a plurality of first reinforcing plates are provided on the outer side of the bottom of the groove, arranged circumferentially along the annular bracket.

[0015] Beneficial effects: The groove is a weak area in the cross-section of the annular support, which needs to withstand the radial reaction force generated by the inflation of the annular airbag and the load transmitted by the test water pressure. By setting multiple first reinforcing plates arranged at intervals along the circumference of the annular support on the outer side of the bottom of the groove, the structural rigidity and deformation resistance of the groove part of the annular support can be effectively enhanced, avoiding radial depression or circumferential deformation of the annular support under high pressure, ensuring the structural stability of the groove, and thus maintaining the consistency of the installation position and inflation shape of the annular airbag. This ensures that each ring of protrusions can uniformly press against the pipe wall, guaranteeing the sealing reliability of the water pressure test area, preventing problems such as sealing failure and pressure leakage caused by deformation of the annular support, and improving the accuracy and stability of the test results.

[0016] Furthermore, the axial width of the annular bracket is greater than the axial width of the groove, so as to form the side edges of the annular bracket on both sides of the groove; a plurality of second reinforcing plates are provided between the outer wall of the groove and the side edges, arranged circumferentially.

[0017] Beneficial Effects: When the annular airbag inflates, it generates axial expansion force. The high-pressure water in the hydrostatic test zone also exerts an outward axial thrust on the protrusions on both sides and the sidewalls of the groove. The sidewalls of the groove are the key weak points that bear this type of axial load. This application solves this problem by setting the axial width of the annular bracket to be greater than the axial width of the groove to form side edges on both sides of the groove, and by setting multiple second reinforcing plates arranged circumferentially between the outer wall of the groove and the side edges to form a reinforced structure. This effectively disperses and transmits the axial load, enhances the axial deformation resistance and structural stability of the groove sidewalls, ensures that the annular airbag is firmly and reliably installed in the groove, maintains the consistency of the axial spacing of each ring of protrusions with the state of the compressed pipe wall, ensures the sealing performance of the local hydrostatic test zone, prevents problems such as annular airbag displacement, seal failure, and pressure leakage caused by sidewall deformation, and improves the accuracy and stability of the hydrostatic test results.

[0018] Furthermore, among the plurality of protrusions, the axial distance between at least two adjacent protrusions is greater than the installation gap width of the interface of the pipe to be tested.

[0019] Beneficial effects: By setting the axial distance between at least two adjacent protrusions to be greater than the installation gap width of the pipe interface under test, it can be ensured that the two protrusions after inflation can be completely pressed against the continuous pipe walls on both sides of the pipe interface. This avoids the problem of the protrusions not being able to be effectively pressed against the interface installation gap due to the discontinuity of the pipe wall, which would lead to sealing failure. At the same time, the area between the two protrusions can completely cover the entire interface gap, forming a closed and complete water pressure test area together with the inner wall of the pipe and the sealing ring at the interface. This ensures the sealing performance of the water pressure test area, prevents high-pressure water from leaking along the interface gap, and ensures the stability of the test pressure and the accuracy of the test results.

[0020] Furthermore, the annular support is made of a lightweight, rigid material.

[0021] Beneficial Effects: The ring support is made of lightweight, rigid materials, which effectively reduces the overall weight of the device while ensuring the structural strength and deformation resistance of the ring support. On the one hand, sufficient structural rigidity can stably bear the radial and axial reaction forces generated by the inflation of the ring airbag, as well as the high-pressure water load in the hydrostatic test area, avoiding deformation problems such as radial concavity and sidewall bulging of the ring support. This ensures that the ring airbag is firmly installed and has a uniform expansion pattern, and ensures a reliable sealing effect of each ring of protrusions pressing against the pipe wall. On the other hand, the lightweight characteristics reduce the weight of the device, making it easier for on-site workers to carry out operations such as handling and installation by hand without relying on large lifting equipment. It is especially suitable for single-port pressure testing operations that require moving and testing each port one by one, which can improve the efficiency of installation and relocation, shorten the overall construction cycle, and reduce the labor intensity of workers and the equipment investment cost of on-site construction.

[0022] Furthermore, it also includes an exhaust port that radially penetrates the annular support and the annular airbag and extends to the hydrostatic test area for discharging gas from the hydrostatic test area.

[0023] Beneficial Effects: The core judgment logic of hydrostatic testing is based on the low compressibility of water. Sealing performance is determined by monitoring pressure changes or water leakage during the pressure holding phase. If air remains in the hydrostatic test area, its high compressibility will cause non-leakage pressure decay during the pressure holding process, leading to misjudgments of interface leakage. This application addresses this by adding a radially penetrating annular support and annular airbag extending to the hydrostatic test area. This allows air to be expelled from the hydrostatic test area during the water injection and pressurization process, ensuring the test area is filled with test water. This eliminates the interference of air compressibility on pressure monitoring, enabling pressure drop and water leakage data to accurately reflect the sealing status of the tested part. This ensures the accuracy and reliability of the hydrostatic test results, avoiding unnecessary rework and repeated tests due to misjudgments.

[0024] Furthermore, the water injection port and the vent are arranged symmetrically about the diameter axis of the annular bracket.

[0025] Beneficial effects: By setting the water injection port and the vent port symmetrical about the diameter axis of the annular bracket, the water injection port and the vent port are located on both sides of the same diameter of the annular bracket. During on-site installation, it is only necessary to adjust the axis of symmetry to the vertical direction to naturally form a bottom-inlet and top-outlet structure with the water injection port at a low position and the vent port at a high position. During the water injection process, the water is slowly injected from the lowest point of the water pressure test area and gradually fills the entire water pressure test area upwards. The air in the water pressure test area is continuously compressed by the water and gathers at the highest point and is discharged from the vent port. This can eliminate the dead corners of venting in the annular water pressure test area, ensure that the water pressure test area is completely filled with test water, eliminate the interference of residual air on pressure monitoring, and further improve the accuracy and reliability of the test results.

[0026] Furthermore, both the water injection port and the venting port can be detachably fitted with sealing components.

[0027] Beneficial effects: By detachably installing sealing components on both the water injection port and the air vent port, the sealing components can be removed during the water injection and air venting phases to allow the water injection port to connect to the water supply equipment and the air vent port to vent air smoothly. After the water injection is completed and the air in the cavity is purged, the two ports are sealed again with the sealing components to form a completely sealed space in the water pressure test area, effectively preventing pressure leakage at the ports and ensuring the stability of the test pressure.

[0028] To solve the above problems, the method of using the single-port hydrostatic testing device for pipelines provided by this invention adopts the following technical solution: A method for using a single-port hydraulic pressure testing device for pipelines, comprising the following steps: S1: Place the annular support with the nested annular airbag at the interface to be tested; S2: Inflate the annular airbag through the inflation port so that each ring of protrusions presses against the inner wall of the pipe to be tested, and together with the inner wall of the pipe, they form a closed water pressure test area. S3: Water is injected into the water pressure test area through the water injection interface and pressurized to the test pressure to carry out the pipeline water pressure test.

[0029] The beneficial effects of the method of using the single-port hydrostatic testing device for pipelines provided by this invention are: First, the annular support containing the annular airbag is placed at the target position inside the pipe to be tested. Then, pressurized gas is injected into the annular airbag through the inflation port, causing the protrusions on the outer periphery of the annular airbag to expand radially synchronously and tightly press against the inner wall of the pipe to be tested. This creates a closed water pressure test area inside the pipe that only covers the local section to be tested, reducing the amount of water injected and drained in a single test, and also reducing the equipment and manpower required for water injection and drainage.

[0030] Secondly, since the test scope is precisely limited to a pre-defined local pipe section, the test results directly correspond to the sealing performance of that area. If the pressure drop exceeds the standard or the leakage volume does not meet the standard, the leakage defect can be directly located in the current test section without the need for large-scale excavation and investigation of the entire pipeline, thus improving the efficiency and accuracy of locating leakage defects.

[0031] Finally, since the leak point can be accurately located, subsequent rework and repair only need to be carried out on the local defect area, without having to drain the water from the entire pipeline. After the repair is completed, only the local area needs to be pressure tested again, which reduces the amount of earthwork excavation, pipeline disassembly and assembly and repeated testing, effectively shortens the overall construction cycle, and avoids the repeated waste of water resources caused by reworking the entire pipeline, further reducing the time and economic costs of the project.

[0032] In summary, the present invention effectively solves the technical problems of high water consumption and high cost in the prior art for whole-pipe pressure testing, as well as the inability to accurately locate the leak point, which leads to rework and excavation and extended construction period. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the single-port hydraulic pressure testing device for pipelines provided by the present invention. Figure 2 This is a schematic diagram of the structure of the ring-shaped support provided by the present invention; Figure 3 for Figure 2 The main view; Figure 4for Figure 3 Sectional view of AA in the middle; Figure 5 This is a schematic diagram of the structure of the annular airbag provided by the present invention; Figure 6 A schematic diagram of the application structure of the single-port hydraulic pressure testing device for pipelines provided by the present invention; Figure 7 for Figure 6 A magnified view of a portion of point A in the middle; Figure 8 A flowchart illustrating the usage method of the single-port hydrostatic testing device for pipelines provided by this invention.

[0034] Explanation of reference numerals in the attached figures: 1. Ring bracket; 2. Side plate; 3. Ring airbag; 4. Inflation port; 5. Water injection port; 6. Protrusion; 7. Water pressure test area; 8. First reinforcing plate; 9. Side edge; 10. Second reinforcing plate; 11. Exhaust port; 12. Water injection through hole; 13. Inflation through hole; 14. Socket; 15. Insertion tube; 16. Sealing ring. Detailed Implementation

[0035] The principles and spirit of the present invention will be explained in detail below with reference to several representative embodiments.

[0036] An embodiment of the single-port hydrostatic testing device for pipelines provided by this invention: like Figures 1 to 7 As shown, the single-port water pressure test device for pipelines includes an annular support 1, an annular airbag 3, an inflation port 4, a water injection port 5, and an exhaust port 11.

[0037] like Figures 2 to 4 As shown, in this embodiment, the outer wall of the annular bracket 1 is provided with a groove. Specifically, two side plates 2 are fixedly installed on the outer wall of the annular bracket 1, spaced apart along its axial direction, and the two side plates 2 form a groove with the annular bracket 1. In other embodiments, the groove can also adopt other structural forms that can provide annular installation space, such as: an annular groove structure directly integrally machined on the outer wall of the annular bracket 1, that is, the groove is directly formed on the body of the annular bracket 1 by casting, machining or extrusion molding, etc., without the need for additional side plates 2, which can reduce the number of parts and assembly steps; or, the groove is formed by splicing two independent semi-annular brackets 1, and the two are joined together to form a complete annular groove.

[0038] like Figures 5 to 7 As shown, in this embodiment, the annular airbag 3 is a hollow elastic sealing structure, which is nested in the groove.

[0039] like Figures 5 to 7As shown, in this embodiment, four rings of protrusions 6 are arranged at intervals along the axial direction on the outer circumference of the annular airbag 3. Each protrusion 6 surrounds the circumference of the annular airbag 3. When the annular airbag 3 is inflated, each ring of protrusions 6 expands radially outward and tightly presses against the inner wall of the pipe to be tested. The multiple protrusions 6 and the pipe wall together form a closed annular water pressure test area 7.

[0040] like Figure 2 and Figure 5 As shown, in this embodiment, the annular airbag 3 and the annular support 1 are provided with corresponding inflation holes 13. The inflation port 4 passes through the inflation hole 13 and is fixedly installed on the annular airbag 3 to connect the internal cavity of the annular airbag 3 with the external air source. The annular airbag 3 and the annular support 1 are provided with corresponding water injection holes 12. The water injection port 5 passes radially through the water injection holes 12 on the annular support 1 and the annular airbag 3, and its inner end extends to the water pressure test area 7 to connect the water pressure test area 7 with the external water source.

[0041] When the annular airbag 3 is inflated, the protrusions 6 of each ring expand radially outward and press against the pipe wall of the pipe to be tested, forming a closed annular water pressure test area 7 together with the inner wall of the pipe, thereby realizing independent water pressure test of a local area of ​​the pipe.

[0042] like Figure 5 As shown, in this embodiment, there are multiple inflation ports 4, which are evenly distributed along the circumference of the annular support 1. Each inflation port 4 is connected to the internal cavity of the annular airbag 3. Simultaneous inflation at multiple points allows for a uniform increase in circumferential air pressure in the annular airbag 3, avoiding uneven circumferential expansion caused by single-point inflation. This ensures consistent circumferential pressure on each ring of protrusions 6, while also shortening inflation time and improving on-site operational efficiency. In this embodiment, the inflation port 4 is an air nozzle. In other embodiments, the inflation port 4 can also adopt other connection joint structures that enable inflation and pressure holding of the annular airbag 3, such as quick-connect pneumatic joints, threaded inflation joints with one-way valves, pagoda-type hose joints, standard valve core joints, and clamp-type high-flow inflation joints. These can be flexibly selected based on pipe diameter, test pressure level, and on-site air source conditions.

[0043] like Figure 2 and Figure 4As shown, in this embodiment, multiple first reinforcing plates 8 are provided on the outer side of the bottom of the groove, and the multiple first reinforcing plates 8 are arranged at intervals along the circumference of the annular bracket 1. The first reinforcing plates 8 can specifically improve the structural rigidity and deformation resistance of the bottom of the groove, offset the radial reaction force generated by the inflation of the annular airbag 3 and the load of the test water pressure, avoid radial concavity deformation at the bottom of the groove, and ensure the structural stability of the annular bracket 1. In this embodiment, the first reinforcing plate 8 is a rectangular plate. In other embodiments, the first reinforcing plate 8 can also be a trapezoidal plate. It should be noted that the multiple first reinforcing plates 8 can be arranged at equal intervals along the circumference of the annular bracket 1, or they can be arranged in a non-equal interval. For example, the first reinforcing plates 8 can be densely arranged at the corresponding positions where the stress is concentrated, such as the water injection port 5 and the exhaust port 11.

[0044] like Figure 2 As shown, in this embodiment, the axial width of the annular bracket 1 is greater than the axial width of the groove, and side edges 9 of the annular bracket 1 are formed on both sides of the groove along the axial direction. Multiple second reinforcing plates 10 are provided between the outer wall of the side plate 2 and the side edges 9. These multiple second reinforcing plates 10 are arranged at intervals along the circumference of the annular bracket 1, forming a support structure between the outer wall of the groove and the side edges 9, enhancing the axial deformation resistance of the groove sidewall, and enabling it to withstand the axial expansion force of the annular airbag 3 and the axial thrust of the water pressure, thus preventing the groove sidewall from expanding and deforming outwards. In this embodiment, the second reinforcing plate 10 is a trapezoidal plate; in other embodiments, the second reinforcing plate 10 can also be a triangular plate. It should be noted that the multiple second reinforcing plates 10 can be arranged at equal intervals along the circumference of the annular bracket 1, or they can be arranged in a non-equal interval manner. For example, the second reinforcing plates 10 can be densely arranged at corresponding positions where stress is concentrated, such as the water injection port 5 and the exhaust port 11.

[0045] like Figures 5 to 7 As shown, in this embodiment, there are four protrusions 6. The pipe to be tested is a socket pipe. The axial distance between the second and third protrusions 6 is greater than the installation gap width between the socket pipe 14 and the insertion pipe 15. A sealing ring 16 is installed at the interface between the socket pipe 14 and the insertion pipe 15. The sealing ring 16, together with the protrusions 6, the outer wall of the annular airbag 3, the pipe wall of the socket pipe 14, and the pipe wall of the insertion pipe 15, forms a closed annular water pressure test area 7. The two protrusions 6 can be pressed tightly against the pipe walls of the socket pipe 14 and the insertion pipe 15 on both sides of the interface, preventing the protrusions 6 from falling into the interface installation gap and causing sealing failure. At the same time, it ensures that the water pressure test area 7 completely covers the entire interface gap, ensuring the comprehensiveness and accuracy of the interface sealing performance test. In other embodiments, the total number of protrusions 6 can also be flexibly adjusted according to the sealing level requirements, such as two, three, or five rings, as long as the axial distance between the nearest protrusions 6 on both sides of the water injection interface 5 meets the interface coverage requirements.

[0046] like Figure 6 and Figure 7 As shown, in this embodiment, the cross-section of the protrusion 6 adopts a semi-circular structure; in other embodiments, the cross-section of the protrusion 6 may also adopt other shapes that are suitable for pipe wall sealing, such as rectangular, trapezoidal, arc-shaped, multi-serrated, etc.

[0047] In this embodiment, the ring support 1 is made of lightweight rigid material, such as aluminum alloy or high-strength engineering plastic. While ensuring the structural strength and deformation resistance of the ring support 1, the overall weight of the device can be effectively reduced, making it easier for on-site workers to carry out operations such as handling, installation, alignment, and segmental relocation and adjustment, thereby improving the convenience of on-site operations and reducing the labor intensity and equipment investment costs.

[0048] like Figure 1 and Figure 5 As shown, in this embodiment, the annular airbag 3 and the annular bracket 1 are provided with corresponding exhaust ports. The exhaust port 11 passes through the exhaust port radially, and its inner end extends into the water pressure test area 7. During the process of injecting water into the water pressure test area 7, the residual air in the cavity can be discharged through the exhaust port 11 to eliminate the interference of the compressibility of the residual gas on the pressure detection, avoid non-leakage pressure drop during the pressure holding stage, and ensure the accuracy of the test results.

[0049] like Figure 6 As shown, in this embodiment, the water injection port 5 and the exhaust port 11 are symmetrically arranged about the diameter axis of the annular bracket 1. During on-site installation, the exhaust port 11 is adjusted to a high position and the water injection port 5 is adjusted to a low position to form a bottom-inlet and top-outlet water injection and exhaust path, so that water is slowly injected from the bottom of the test area and air is collected and discharged upwards, ensuring that there are no dead corners in the exhaust. At the same time, it can simplify the on-site alignment operation and improve the installation efficiency.

[0050] Furthermore, in this embodiment, both the water injection port 5 and the vent port 11 are detachably equipped with sealing components. After water injection and venting are completed, the sealing components can be used to seal the water injection port 5 and the vent port 11 respectively, ensuring the airtightness of the water pressure test area 7 and maintaining stable test pressure. The detachable installation method facilitates quick on-site disassembly and assembly, adapting to the on / off requirements of each stage of the test, and also facilitates the individual replacement of the sealing components after wear, reducing the maintenance cost of the device. Specifically, as shown... Figures 5 to 7 As shown, in this embodiment, the outer periphery of both the water injection port 5 and the vent port 11 facing the center of the annular bracket 1 is provided with threads to facilitate the screwing on of the sealing component. In other embodiments, the sealing component may also adopt other detachable sealing structures, such as quick-connect sealing plugs, plug-in sealing plugs, snap-on sealing plugs, etc.

[0051] It should be noted that the standard for judging that the gas in the water pressure test zone 7 has been completely discharged is that the water flowing out from the exhaust port 11 is no longer gas or bubble water, but a continuous, full, bubble-free complete water flow.

[0052] The working principle of the single-port hydrostatic testing device for pipelines provided by this invention is as follows: First, the device is placed at the target testing position of the pipeline to be tested. Compressed gas is injected into the annular airbag 3 nested in the groove through the inflation ports 4 evenly distributed around the annular support 1. The annular airbag 3 expands synchronously around the circumference. The four rings of protrusions 6 arranged axially around its outer circumference expand radially outward and press against the inner wall of the pipeline. The radial seal of the four protrusions 6 and the inner wall of the pipeline together form a closed annular water pressure test zone 7.

[0053] After allowing the device to stand for a short time and observing for any abnormalities such as displacement or air leakage, once confirmed to be normal, inject test water into the water pressure test zone 7 through the lower water injection port 5. Simultaneously, expel any residual air from the water pressure test zone 7 through the corresponding higher vent port 11. Once the water pressure test zone 7 is filled with water, seal the vent port 11 with a sealing device. Then, continue injecting high-pressure water into the sealed water pressure test zone 7 through the water injection port 5 to gradually increase the pressure within the zone. Once the pressure reaches the specified test pressure, seal the water injection port 5 and enter the pressure holding stage. By monitoring the pressure changes or water leakage within the water pressure test zone 7 during the pressure holding period, it can be determined whether the sealing performance and structural strength of the local pipe section or pipe joint meet the requirements.

[0054] An embodiment of the method of using the single-port hydrostatic testing device for pipelines provided by the present invention: like Figure 8 As shown, the method of using the single-port hydrostatic testing device for pipelines includes the following steps: S1: Place the annular support with the nested annular airbag at the interface to be tested; S2: Inflate the annular airbag through the inflation port so that each ring of protrusions presses against the inner wall of the pipe to be tested, and together with the inner wall of the pipe, they form a closed water pressure test area. S3: Water is injected into the water pressure test area through the water injection interface and pressurized to the test pressure to carry out the pipeline water pressure test.

[0055] In this embodiment, in step S1, for the water pressure test at the pipe interface (e.g., the interface between the socket pipe and the insert pipe), after the annular support with the nested annular airbag is axially inserted into the target detection position of the pipe to be tested, the axial position of the device is adjusted so that the two adjacent protrusions with an axial spacing greater than the pipe interface installation gap correspond to the complete pipe walls on both sides of the interface, ensuring that the pipe interface installation gap falls within the area between the two protrusions. An exhaust port is installed on the annular airbag, which radially penetrates the annular support and the annular airbag, and whose inner end extends into the water pressure test area. The exhaust port is adjusted to a high position, and the water injection port corresponds to a low position, forming a bottom-inlet, top-outlet water injection and exhaust path.

[0056] In this embodiment, in step S2, multiple inflation ports evenly distributed circumferentially are connected to external pressure gas sources, and compressed gas is simultaneously injected into the internal cavity of the annular airbag, causing the annular airbag to expand evenly circumferentially. The protrusions on its outer periphery simultaneously expand radially outward and tightly press against the inner wall of the pipe under test. Inflation stops once the inflation pressure reaches a preset value. At this point, the multiple protrusions and the inner wall of the pipe together form a closed annular hydrostatic test area. Subsequently, the device is left to stand for a short time, and any abnormalities such as displacement or leakage are observed.

[0057] In this embodiment, in step S3, the water injection port is connected to an external water source, and the vent port is kept open. The test water from the water source is injected into the water pressure test area through the water injection port. The residual air in the water pressure test area is continuously discharged through the vent port during the water injection process. After the vent port continues to overflow and no air bubbles are carried out, confirming that the air in the cavity is completely discharged, the vent port is first sealed with a sealing component. Then, high-pressure water is injected into the sealed water pressure test area through the water injection port to gradually increase the pressure in the cavity to the specified test pressure. The water injection port is then sealed with a sealing component, and the pressure holding stage is entered according to the test specifications. By monitoring the pressure change or water leakage during the pressure holding period, it can be determined whether the sealing performance and structural strength of the pipe interface or local pipe section meet the standard requirements.

[0058] After the test is completed, the annular airbag is deflated, and then the device can be moved to the next test site to quickly carry out a new round of single-port hydrostatic test.

[0059] Based on the above description in this specification, those skilled in the art will also understand that the following terms, such as "upper," "lower," "front," "back," "left," "right," "inner," and "outer," which indicate orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings of this specification and should not be understood or interpreted as limiting the present invention.

[0060] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. A single-port hydraulic testing device for pipes, comprising a ring-shaped support, the outer wall of which is provided with a groove, and a ring-shaped air bag is nested in the groove, characterized in that, It also includes an inflation port and a water injection port; the outer circumference of the annular airbag is provided with multiple rings of protrusions arranged at intervals along its axial direction, each protrusion surrounding the circumference of the annular airbag. After the annular airbag is inflated, each protrusion presses against the pipe wall of the pipe to be tested, and together with the pipe wall, they enclose a closed water pressure test area; the inflation port is located on the annular airbag to connect the annular airbag and the air source; the water injection port penetrates the annular support and the annular airbag radially to connect the water pressure test area and the water source.

2. The single-port water pressure testing device for pipelines according to claim 1, characterized in that, The number of inflation ports is not less than one.

3. The single-port water pressure testing device for pipelines according to claim 1 or 2, characterized in that, The bottom of the groove is provided with a plurality of first reinforcing plates arranged circumferentially along the outer side of the annular bracket.

4. The single-port water pressure testing device for pipelines according to claim 1 or 2, characterized in that, The axial width of the annular bracket is greater than the axial width of the groove, so as to form the side edges of the annular bracket on both sides of the groove; a plurality of second reinforcing plates are provided between the outer wall of the groove and the side edges, which are arranged circumferentially.

5. The single-port water pressure testing device for pipelines according to claim 1 or 2, characterized in that, Of the plurality of protrusions, at least two adjacent protrusions have an axial distance greater than the installation gap width of the interface of the pipe to be tested.

6. The single-port hydrostatic testing device for pipelines according to claim 1 or 2, characterized in that, The annular support is made of a lightweight, rigid material.

7. The single-port water pressure testing device for pipelines according to claim 1 or 2, characterized in that, It also includes an exhaust port that extends radially through the annular support and the annular airbag and into the hydrostatic test zone for discharging gas from the hydrostatic test zone.

8. The single-port water pressure testing device for pipelines according to claim 7, characterized in that, The water injection port and the vent are arranged symmetrically about the diameter axis of the annular bracket.

9. The single-port water pressure testing device for pipelines according to claim 7, characterized in that, Both the water injection port and the venting port can be detachably fitted with sealing components.

10. A method of using a single-port hydrostatic testing device for pipelines, characterized in that, The single-port hydrostatic test device according to any one of claims 1 to 9 is used to carry out the test, which includes the following steps: S1: Place the annular support with the nested annular airbag at the interface to be tested; S2: Inflate the annular airbag through the inflation port so that each ring of protrusions presses against the inner wall of the pipe to be tested, and together with the inner wall of the pipe, they form a closed water pressure test area. S3: Water is injected into the water pressure test area through the water injection interface and pressurized to the test pressure to carry out the pipeline water pressure test.

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