Pipeline pressure test blind plate reinforcing construction method and pipeline pressure test reinforcing blind plate

Abstract

The embodiment of the invention provides a pipeline pressure test blind plate reinforcing construction method and a pipeline pressure test reinforcing blind plate, and relates to the field of LNG storage tank pipeline pressure test blind plates. In order to meet the pump pipe hydrostatic test requirement of the LNG storage tank, a reinforcing steel plate is directly welded on a bottom blind plate to enhance the strength of the blind plate, and the bottom blind plate is uncontrollably deformed. According to the pipeline pressure test blind plate reinforcing construction method, the double blind plates are attached and fixed to form a stable supporting structure, and welding deformation is avoided; a reinforcing component is precisely welded on a non-working surface, and pressure test stress is dispersed to an integral structure by using double blind plates, so that the strength of a stress concentration area is improved, and deformation is reduced; and after welding is completed, separation is conducted, the obtained single pressure test reinforcing blind plate has enough strength and rigidity, the requirement for pipeline pressure test can be met, the flatness and size precision of the blind plate are guaranteed, and the safety and reliability of pressure test are improved.

Description

Technical Field

[0001] This invention relates to the field of blind flanges for LNG storage tank pipeline pressure testing, and more specifically, to a construction method for reinforcing blind flanges for pipeline pressure testing and a pipeline pressure testing reinforcement blind flange. Background Technology

[0002] In the field of liquefied natural gas (LNG) engineering, after the completion of pipeline construction within LNG cryogenic storage tanks, conducting hydrostatic tests on the pump pipes is a crucial step in ensuring the safe and reliable operation of the pipeline system. Hydrostatic testing simulates the pressure the pipelines withstand under actual operating conditions, verifying the strength and sealing of the pipelines and their connections. It allows for the timely detection of potential design flaws, manufacturing defects, or installation problems, thereby preventing safety accidents such as leaks and ruptures during actual operation and ensuring the safety of LNG storage and transportation. In the LNG tank pump pipe system involved, the overall height of the pump pipes after installation is nearly 60m. Such a tall pump pipe structure means that the stress on the bottom is the most complex and enormous when subjected to hydrostatic test pressure. Simultaneously, the pump pipes are designed to withstand a pressure of 1.15 MPa. Under such high pressure, the bottom blind flange, as a key pressure-bearing component, directly affects the safety and stability of the entire pump pipe system; therefore, the bottom blind flange becomes the focus of analysis.

[0003] Currently, conventional blind flange designs often fail to fully consider the stress characteristics of pump pipes within LNG tanks under special operating conditions. When facing a nearly 60m high pump pipe and a design pressure of 1.15MPa during a hydrostatic test, traditional blind flanges may not meet the strength and stiffness requirements, leading to significant deformation during the test. This deformation can not only affect the blind flange's own sealing performance, making the hydrostatic test inaccurately simulate actual operating conditions, but also adversely affect connected pump pipes and other components, reducing the reliability of the entire system. To enhance the strength of the blind flange and reduce deformation, a common practice is to directly weld reinforcing steel plates to the areas of greatest deformation. However, this direct welding method presents several problems in practice. Due to the large amount of heat generated during welding, the blind flange material undergoes thermal expansion and thermal stress changes after localized heating, resulting in welding deformation. This welding deformation is uncontrollable and may alter the flatness and dimensional accuracy of the blind flange, further affecting its sealing performance and the connection quality with the pump pipe. Furthermore, welding deformation may cause residual stress inside the blind flange, reducing its fatigue life and making it more susceptible to damage during subsequent reuse, thus failing to meet the requirements for reusability. Summary of the Invention

[0004] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0005] The present invention aims to provide, for example, a method for reinforcing a pipeline pressure test blind flange and a pipeline pressure test reinforced blind flange, which can improve the problem of uncontrollable deformation of the bottom blind flange caused by directly welding a reinforcing steel plate onto the bottom blind flange to enhance its strength in order to meet the pump pipe hydrostatic test requirements of LNG storage tanks.

[0006] The embodiments of the present invention can be implemented as follows: An embodiment of the present invention provides a method for reinforcing blind flanges during pipeline pressure testing, comprising: The sealing surfaces of the first and second blind flanges to be reinforced are fitted together and fixedly connected by detachable connectors. According to the predetermined reinforcement plan, reinforcement components are welded on the non-working surfaces of the first blind plate and / or the second blind plate. After welding is completed, the detachable connector is disassembled, and the first blind plate and the second blind plate are separated to obtain a single pressure-tested reinforced blind plate.

[0007] In addition, the pipeline pressure testing blind flange reinforcement construction method provided in the embodiments of the present invention may also have the following additional technical features: Optionally, the detachable connector is a bolt assembly, and the periphery of the first blind plate and the second blind plate are respectively provided with flange holes for the bolt assembly to pass through.

[0008] Optionally, the flange hole is a pre-drilled flange hole on the first blind plate and the second blind plate for connection with a pipeline.

[0009] Optionally, the step of welding reinforcing components on the non-working surfaces of the first blind plate and / or the second blind plate according to a predetermined reinforcement scheme includes: Based on mechanical analysis, the deformation concentration areas of the first blind plate and the second blind plate are obtained, and reinforcement components are welded to the deformation concentration areas of the non-working surfaces of the first blind plate and / or the second blind plate.

[0010] Optionally, the deformation concentration area includes the central area of ​​the blind plate, and / or the area between the central area of ​​the blind plate and the flange hole on the periphery of the blind plate.

[0011] Optionally, the reinforcing member is welded to the non-working surface of the first blind plate or the second blind plate by intermittent welding or stiffening ribs.

[0012] Optionally, the reinforcing member is a reinforcing steel plate, and there are multiple reinforcing steel plates, which are welded in a crisscross pattern on the non-working surface of the first blind plate or the second blind plate.

[0013] Optionally, the first blind plate and the second blind plate have the same structure, size and material.

[0014] Optionally, after the separation step of the first blind plate and the second blind plate, the pressure-tested reinforced blind plate is used as the blind plate to be reinforced in the next round of work, and is assembled with another blind plate to be reinforced to manufacture the next pressure-tested reinforced blind plate.

[0015] Optionally, the reinforced blind flange obtained after the pipeline pressure test blind flange reinforcement construction method is suitable for water pressure testing of vertical pipelines with a design pressure greater than or equal to 1.15 MPa and an installation height greater than or equal to 60 meters.

[0016] An embodiment of the present invention also provides a pipeline pressure testing and reinforcement blind flange, which is obtained by a pipeline pressure testing and reinforcement construction method.

[0017] The beneficial effects of the pipeline pressure testing blind flange reinforcement construction method and the pipeline pressure testing blind flange reinforcement method of this invention include, for example: The pipeline pressure testing blind flange reinforcement construction method involves attaching two blind flanges together with their sealing surfaces and securing them with detachable connectors to form a stable double-layer support structure. This effectively disperses localized stress generated during welding, preventing warping and deformation of the single-layer blind flange due to uneven heating, and ensuring the flatness of the sealing surface. Based on mechanical analysis, reinforcement components are welded to the non-working surface, transforming the axial pressure during the pressure test into a synergistic force between the reinforcement layer and the blind flange body, resulting in a more uniform stress distribution. Simultaneously, welding on the non-working surface does not damage the sealing structure, ensuring the sealing reliability of the test medium. The resulting individual blind flange retains the structural strength provided by the reinforcement layer while achieving lightweight design through modularization, facilitating high-altitude installation and reuse. This method solves the problems of insufficient strength, easy deformation, and low reusability of traditional blind flanges, making it suitable for the long-term stable pressure testing requirements of high-pressure vertical pipelines.

[0018] The pipeline pressure test reinforcement blind flange can improve the problem of uncontrollable deformation of the bottom blind flange caused by directly welding reinforcement steel plates to the bottom blind flange to enhance the strength of the blind flange in order to meet the pump pipe water pressure test requirements of LNG storage tank. Attached Figure Description

[0019] The above-described features and advantages of the present invention will be better understood after reading the following detailed description of embodiments of the present disclosure in conjunction with the accompanying drawings. In the drawings, components are not necessarily drawn to scale, and components having similar related characteristics or features may have the same or similar reference numerals.

[0020] Figure 1 A flowchart of the pipeline pressure testing and blind flange reinforcement construction method provided in this embodiment of the invention; Figure 2 This is a top view of a pressure-tested reinforced blind flange provided in an embodiment of the present invention; Figure 3 This is a side view of a pressure-tested reinforced blind flange provided in an embodiment of the present invention.

[0021] Icons: Pressure test reinforced blind flange-10; First blind flange-100; Sealing working surface-101; Non-working surface-102; Flange hole-103; Reinforcing steel plate-200. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the aspects described below with reference to the accompanying drawings and specific embodiments are merely exemplary and should not be construed as limiting the scope of protection of the present invention in any way.

[0023] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," "outer," or "vertical" appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use, and does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0024] At the same time, it should be noted that the terms "first" and "second" are used only for distinguishing descriptions and should not be interpreted as indicating or implying relative importance.

[0025] In the description of this invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components, etc. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] The following is combined Figures 1 to 3 The pipeline pressure testing and blind flange reinforcement construction method provided in this embodiment is described in detail.

[0027] Please refer to Figure 1 and Figure 2 The present invention provides a method for reinforcing a pipeline with a blind flange during pressure testing, comprising: Step S1: The sealing working surfaces 101 of the first blind plate 100 and the second blind plate to be reinforced are fitted together and fixedly connected by a detachable connector. Step S2: According to the predetermined reinforcement plan, reinforcement components are welded on the non-working surface 102 of the first blind plate 100 and / or the second blind plate. Step S3: After welding is completed, the detachable connector is disassembled, and the first blind plate 100 and the second blind plate are separated to obtain a single pressure-tested reinforced blind plate 10.

[0028] "Welding of reinforcing components on the non-working surfaces 102 of the first blind plate 100 and / or the second blind plate" means welding of reinforcing components on the non-working surfaces 102 of the first blind plate 100, or welding of reinforcing components on the non-working surfaces 102 of the second blind plate, or welding of reinforcing components on the non-working surfaces 102 of the first blind plate 100 and the second blind plate. One of these processes can be selected, one can be processed first and the other later, or both can be processed simultaneously.

[0029] Two blind flanges to be reinforced are selected and labeled as the first blind flange 100 and the second blind flange, respectively. The sealing working surfaces 101 of the first and second blind flanges are brought together to ensure a tight, gapless fit. Then, using detachable connectors, such as bolt assemblies, the two blind flanges are fixedly connected to ensure that they do not shift relative to each other during subsequent welding. According to the pre-defined reinforcement plan, the location and method for welding the reinforcement components on the non-working surfaces 102 of the first and / or second blind flanges are determined. Using appropriate welding equipment, the reinforcement components are welded at the selected locations, ensuring that the welding quality meets relevant standards. After welding, the detachable connectors are disassembled, separating the first and second blind flanges. The resulting single blind flange is the pressure-tested reinforced blind flange 10.

[0030] By first bonding and fixing two blind flanges together before welding them for reinforcement, the welding deformation problem caused by uneven heating when directly welding reinforcement components onto a single blind flange is avoided. After welding, the flanges are separated, resulting in a single reinforced blind flange 10 that possesses sufficient strength and rigidity to meet pipeline pressure testing requirements, while also ensuring the flatness and dimensional accuracy of the blind flange, thus improving the safety and reliability of the pressure test. Furthermore, this construction method makes the blind flange reusable, reducing costs.

[0031] Reference Figure 1 and Figure 2In this embodiment, the detachable connector is a bolt assembly, and the periphery of the first blind plate 100 and the second blind plate are respectively provided with flange holes 103 for the bolt assembly to pass through.

[0032] The detachable connector uses bolt assemblies. Flange holes 103 are correspondingly formed on the periphery of the first blind flange 100 and the second blind flange. The number and specifications of the flange holes 103 are determined according to the size of the blind flange and actual requirements. The bolt assemblies are passed through the corresponding flange holes 103 and tightened with nuts to secure the connection between the two blind flanges. Notably, the flange holes 103 on the periphery of the first blind flange 100 and the second blind flange are the same flange holes originally used for pipe connections, eliminating the need for additional machining of the flange holes 103.

[0033] Bolted assemblies are used as detachable connectors, and the connection is achieved through flange holes 103 around the perimeter of the blind flange. This design offers advantages such as a secure connection and easy disassembly. The bolted connection can withstand significant tensile and shear forces, ensuring that the two blind flanges will not separate or shift relative to each other during welding, thus guaranteeing the stability and accuracy of the weld. Furthermore, disassembly is simple and quick, requiring only the loosening of the nuts, thereby improving construction efficiency.

[0034] In this embodiment, the flange hole 103 is a flange hole 103 pre-fabricated on the first blind plate 100 and the second blind plate for connection with the pipeline.

[0035] "Prefabricated" means that the structure is inherent to the blind flange and is pre-formed, rather than being fabricated for this reinforcement. By directly utilizing the pre-fabricated flange holes 103 on the first and second blind flanges 100 as tooling connection points, compared to existing technologies that require specially drilled process holes or the fabrication of dedicated fixtures on the blind flanges, all additional machining processes for tooling preparation are eliminated. This significantly shortens the construction preparation time and fundamentally reduces the complexity and cost of the reinforcement construction.

[0036] Reference Figure 1 and Figure 2 In this embodiment, the step of welding reinforcing components on the non-working surface 102 of the first blind plate 100 and / or the second blind plate according to the predetermined reinforcement scheme includes: Based on mechanical analysis, the deformation concentration areas of the first blind plate 100 and the second blind plate are obtained, and reinforcement components are welded to the deformation concentration areas of the non-working surfaces 102 of the first blind plate 100 and / or the second blind plate.

[0037] Using specialized mechanical analysis software or methods, the stress conditions of the first blind flange 100 and the second blind flange under pipeline pressure testing are simulated and analyzed to obtain the stress distribution and deformation of the blind flanges. Based on the mechanical analysis results, the deformation concentration areas of the first blind flange 100 and the second blind flange are determined. According to the predetermined reinforcement plan, reinforcement components are welded in the deformation concentration areas of the non-working surfaces 102 of the first blind flange 100 and / or the second blind flange. During welding, welding parameters are carefully controlled to ensure welding quality.

[0038] By identifying the deformation concentration areas of the blind flange through mechanical analysis and then welding reinforcement components to these areas, the local strength and stiffness of the blind flange can be effectively improved, reducing the amount of deformation during the pressure test. This targeted reinforcement method allows for more rational material allocation, improves material utilization, and reduces costs while ensuring the performance of the blind flange.

[0039] Reference Figure 2 and Figure 3 In this embodiment, the deformation concentration area includes the central area of ​​the blind plate, and / or the area between the central area of ​​the blind plate and the flange hole 103 on the periphery of the blind plate.

[0040] The central area of ​​the blind flange is usually a region of high stress and prone to deformation; the area between the central area and the peripheral flange hole 103 may also experience stress concentration due to the structural transition. Identifying these two areas as deformation concentration zones and reinforcing them with welding can effectively strengthen the critical parts of the blind flange, improve its overall deformation resistance, ensure that the blind flange can withstand greater pressure during pressure testing, and guarantee the safe conduct of the pressure test.

[0041] Reference Figure 2 and Figure 3 In this embodiment, the reinforcing member is welded to the non-working surface 102 of the first blind plate 100 or the second blind plate by intermittent welding or stiffening ribs.

[0042] Depending on the specific conditions and reinforcement requirements of the blind flange, either intermittent welding or stiffening ribs are selected for welding the reinforcement components. If intermittent welding is selected, welding is performed on the non-working surface 102 of the first blind flange 100 or the second blind flange at certain intervals and lengths. If stiffening ribs are selected, the stiffening ribs are welded to the non-working surface 102 of the blind flange to ensure a firm weld.

[0043] Intermittent welding can reduce welding heat input, welding deformation, and residual stress while ensuring a certain connection strength. Stiffening ribs can significantly improve the local stiffness of the blind flange and enhance its resistance to deformation. Both welding methods can effectively strengthen the blind flange and improve its performance, while offering good flexibility in selection based on different operating conditions and requirements.

[0044] Reference Figure 2 and Figure 3 In this embodiment, the reinforcing component is a reinforcing steel plate 200. There are multiple reinforcing steel plates 200, which are welded in a crisscross pattern on the non-working surface 102 of the first blind plate 100 or the second blind plate.

[0045] Multiple reinforcing steel plates 200 are welded in a crisscross pattern onto the non-working surface 102 of the blind flange, forming a grid-like reinforcement structure. This structure evenly distributes the stress borne by the blind flange, improving its overall strength and rigidity. Compared to unidirectional reinforcement, this crisscross reinforcement method better resists forces and deformations from different directions, enhancing the stability of the blind flange and enabling it to operate more reliably during pressure testing.

[0046] Reference Figure 2 and Figure 3 In this embodiment, the first blind plate 100 and the second blind plate have the same structure, size and material.

[0047] The first blind flange 100 and the second blind flange have the same structure, dimensions, and material, ensuring that the stress and deformation of the two blind flanges are essentially the same during the bonding, fixing, and welding processes. This allows for more accurate control of welding parameters and reinforcement effects when welding reinforced components, avoiding uneven deformation and stress concentration problems caused by differences between the two blind flanges. Furthermore, identical blind flanges facilitate mass production and standardized management, improving construction efficiency and quality.

[0048] Reference Figure 1 , Figure 2 and Figure 3 In this embodiment, after the separation step of the first blind plate and the second blind plate, the pressure-tested reinforced blind plate 10 is used as the blind plate to be reinforced in the next round of work, and is assembled with another blind plate to be reinforced to manufacture the next pressure-tested reinforced blind plate 10.

[0049] The obtained pressure-tested reinforced blind plate 10 is used as the blind plate to be reinforced in the next round of work. Another blind plate to be reinforced is selected and assembled according to the method of steps S1-S3, that is, its sealing working surface 101 is relatively attached and fixedly connected by detachable connectors. Subsequent reinforcement component welding, separation and other operations are carried out to manufacture the next pressure-tested reinforced blind plate 10.

[0050] This implementation method enables the reusability of the pressure-tested reinforced blind flange 10. After simple processing, the used blind flange can be reused for assembly and reinforcement, maximizing its value and reducing resource waste. Simultaneously, it lowers construction costs, improves economic efficiency, and aligns with the requirements of sustainable development.

[0051] Reference Figure 1 and Figure 2 In this embodiment, the pressure-tested reinforced blind flange 10 obtained after the pipeline pressure test blind flange reinforcement construction method is applicable to the water pressure test of vertical pipelines with a design pressure greater than or equal to 1.15MPa and an installation height greater than or equal to 60 meters.

[0052] The pressure-tested reinforced blind flange 10 obtained by this construction method, after targeted design and reinforcement, can meet the water pressure test requirements of vertical pipelines with a design pressure of not less than 1.15 MPa and an installation height of not less than 60 meters. Under high pressure and high installation height conditions, the blind flange can withstand greater pressure and its own weight, ensuring that no safety issues such as rupture or deformation occur during the pressure test, thus ensuring the smooth progress of the pipeline system's pressure test and providing a reliable guarantee for the safe operation of the pipeline.

[0053] An embodiment of the present invention also provides a pipeline pressure testing and reinforcement blind flange 10, which is obtained by a pipeline pressure testing and reinforcement construction method.

[0054] The pipeline pressure testing reinforced blind flange 10 obtained by this method has sufficient strength and rigidity to meet the requirements of pipeline pressure testing; it exhibits minimal welding deformation, ensuring the flatness and dimensional accuracy of the blind flange; it is reusable, reducing costs; and it is suitable for specific working conditions, ensuring the safety and reliability of pressure testing. This provides a high-quality, high-performance blind flange product for pipeline pressure testing.

[0055] According to the pipeline pressure testing blind flange reinforcement construction method provided in this embodiment, the working principle of the pipeline pressure testing blind flange reinforcement construction method includes: two blind flanges with identical structures are fitted together with their sealing working surfaces 101, and fastened using their pre-fabricated pipeline flange bolt holes and bolts. Then, the reinforcement components are welded. The second blind flange provides rigid reaction support for the welding operation of the first blind flange 100 on its non-working surface 102, effectively suppressing and absorbing thermal stress and deformation during the welding process. After welding is completed, the connecting bolts are removed, and the high-precision blind flange that has been reinforced and whose sealing working surface 101 is not affected by welding deformation can be obtained.

[0056] The pipeline pressure testing blind flange reinforcement construction method provided in this embodiment has at least the following advantages: Without requiring any specialized molds or complex tooling, only detachable connectors are needed to fix the first blind flange 100 and the second blind flange before welding. This reduces the deformation of the blind flange caused by welding of reinforcing components, effectively confining welding thermal deformation within the blind flange and solving the problem of uncontrollable deformation during traditional individual welding. Ultimately, the elastic deformation of the blind flange under design pressure can be stably controlled within millimeters, ensuring absolute reliability of the sealing surface during pressure testing and fundamentally eliminating the major safety risks of high-pressure water leakage or component failure.

[0057] Furthermore, the critical clamping support can be achieved using the flange holes 103 on the blind flange itself and conventional bolts. This significantly simplifies the construction process, shortens preparation time, and avoids the material and labor costs associated with manufacturing special fixtures or performing secondary machining, resulting in high economic efficiency and site adaptability.

[0058] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for reinforcing a blind plate for a pipe pressure test, characterized by, The application relates to a pipeline pressure test blind plate reinforcing construction method. The sealing working surfaces of the first blind plate and the second blind plate to be reinforced are attached to each other, and are fixedly connected through detachable connecting pieces; According to a predetermined reinforcing scheme, reinforcing members are welded on the non-working surfaces of the first blind plate and / or the second blind plate; After welding, the detachable connecting pieces are disassembled, and the first blind plate and the second blind plate are separated to obtain a single pressure test reinforcing blind plate.

2. The pipe pressure test blind plate reinforcement construction method according to claim 1, characterized by, The detachable connecting pieces are bolt assemblies, and the peripheries of the first blind plate and the second blind plate are provided with flange holes for the bolt assemblies to pass through.

3. The pipe pressure test blind plate reinforcement construction method according to claim 2, characterized by, The flange holes are flange holes pre-prepared on the first blind plate and the second blind plate for connecting with pipelines.

4. The method of claim 1, wherein, The step of welding reinforcing members on the non-working surfaces of the first blind plate and / or the second blind plate according to the predetermined reinforcing scheme comprises the following steps: According to mechanical analysis, the deformation concentration areas of the first blind plate and the second blind plate are obtained, and reinforcing members are welded on the deformation concentration areas of the non-working surfaces of the first blind plate and / or the second blind plate.

5. The method of claim 4, wherein, The deformation concentration areas include blind plate central areas and / or areas between the blind plate central areas and blind plate peripheral flange holes.

6. The method of claim 1-5, wherein, The reinforcing members are discontinuously welded or are in the form of stiffening ribs and are welded on the non-working surfaces of the first blind plate or the second blind plate.

7. The method of claim 1-5, wherein, The reinforcing members are reinforcing steel plates, and the number of the reinforcing steel plates is multiple, and the multiple reinforcing steel plates are longitudinally and transversely welded on the non-working surfaces of the first blind plate or the second blind plate.

8. The method of claim 1-5, wherein, The first blind plate and the second blind plate have the same structure, size and material.

9. The method of claim 1-5, wherein, After the separation step of the first blind plate and the second blind plate, the pressure test reinforcing blind plate is used as a blind plate to be reinforced in the next round of work, is assembled with another blind plate to be reinforced, and the next pressure test reinforcing blind plate is manufactured.

10. The method of claim 1-5, wherein, The pressure test reinforcing blind plate obtained after the pipeline pressure test blind plate reinforcing construction method is completed is suitable for the water pressure test of a vertical pipeline with a design pressure greater than or equal to 1.15 MPa and an installation height greater than or equal to 60 meters.

11. A pipe pressure test reinforcement blind characterized by, The pipeline pressure test blind plate reinforcing construction method is obtained by adopting any one of claims 1-10.

Images