Radially compressed pipe test piece and preparation and use thereof

Abstract

The present application relates to the technical field of pipeline test piece, especially to a radial pressure pipeline test piece and its preparation and application. The radial pressure pipeline test piece comprises a test sleeve and a lining pipe, the lining pipe is arranged inside the test sleeve, and the test sleeve and the lining pipe form an interference fit. During preparation, the test sleeve is sleeved on the lining pipe, and uniform pressure is applied to the inner side of the test sleeve through the interference fit to form an interference fit with the lining pipe. The test sleeve and the lining pipe in the radial pressure pipeline of the present application can form an interference fit, and the test piece under the radial pressure load condition of the test pipeline can be simulated, so as to solve the problem that the actual pressure load condition of the test pipeline cannot be accurately simulated in the prior art.

Description

Technical Field

[0001] This invention relates to the field of pipeline specimen technology, and in particular to a radially compressed pipeline specimen and its preparation and application. Background Technology

[0002] In the pipeline industry, corrosion resistance, heat transfer performance, and wear resistance are important reference standards for pipeline selection. To accurately test pipeline performance, it is necessary to simulate its operating environment under actual load conditions. Traditional experimental methods often cannot accurately simulate these conditions, therefore the test results may deviate from reality.

[0003] Therefore, it is crucial to provide a specimen that accurately simulates the radial compressive load conditions of the pipe under test. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide a radially compressed pipe specimen and its preparation and application. Interference fit is a common connection method in mechanical engineering, where two components are tightly fitted together by applying appropriate pressure. In pipe performance testing, interference fit can simulate the radial pressure load experienced by the pipe in the actual working environment. To ensure the stability and safety of the interference fit, accurate pressure calculations are required. This ensures that the pressure experienced by the pipe during the experiment matches the pressure in the actual working environment, thereby improving the accuracy of the experiment.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] The first objective of this invention is to provide a radially pressurized pipe specimen, comprising a sleeve to be tested and a liner, wherein the liner is disposed inside the sleeve to be tested, and an interference fit is formed between the sleeve to be tested and the liner.

[0007] In one embodiment of the present invention, the inner diameter of the sleeve to be tested is smaller than the outer diameter of the liner, and the length of the sleeve to be tested is smaller than the length of the liner.

[0008] In one embodiment of the present invention, the central axis of the sleeve to be tested and the liner are the same along the length direction.

[0009] In one embodiment of the present invention, the material of the sleeve to be tested is selected from one of metal, non-metal or composite material;

[0010] The liner is made of a material selected from metal, non-metal, or composite material.

[0011] A second objective of this invention is to provide a method for preparing the aforementioned radially pressurized conduit, comprising the following steps:

[0012] The sleeve to be tested is placed on the liner, and uniform pressure is applied to the inner side of the sleeve to form an interference fit with the liner.

[0013] In one embodiment of the present invention, before applying uniform pressure to the inner surface of the sleeve to be tested, the selection of the interference fit of the sleeve to be tested and the liner is calculated, and then the state of the pressure surface of the sleeve to be tested is simulated and calculated using the finite element analysis method.

[0014] In one embodiment of the present invention, an interference fit between the pipe to be tested and the liner is achieved through mechanical fit, thermal fit, or cooling fit.

[0015] In one embodiment of the present invention, pressure is applied by a hydraulic press or similar device.

[0016] The third objective of this invention is to provide an application of radially compressed pipes in simulating pipe performance under different pressure conditions.

[0017] In one embodiment of the present invention, the application is the application of radially pressurized pipelines in simulating the corrosion resistance of pipelines under different pressure conditions.

[0018] Specifically: First, select appropriate pipe materials and interference fit sleeve materials according to experimental requirements; during the material selection process, it is necessary to comprehensively consider the material's elastic modulus E, Poisson's ratio ν, coefficient of thermal expansion α, and other physicochemical parameters, as these parameters will affect the interference fit pressure and subsequent corrosion performance; integrate the physicochemical information of the selected materials to ensure the accuracy and completeness of the data;

[0019] Based on the physicochemical parameters of the selected material and the experimental requirements, the interference fit is calculated; then, the state of the pressure surface of the casing under test is simulated and calculated using the finite element analysis method.

[0020] Based on the finite element analysis results, select appropriate mechanical fit, thermal fit or cooling fit methods to precisely fit the interference fit sleeve and the liner.

[0021] After the sleeve and liner to be tested are fitted together, a corrosion performance test is conducted.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] In this invention, the test sleeve and the liner in the radially pressurized pipeline can form an interference fit, which can simulate the test specimen under radial pressure load conditions of the pipeline under test, thus solving the problem that the prior art is difficult to accurately simulate the actual pressure load of the pipeline under test. Attached Figure Description

[0024] Fig. 1 This is a vertical sectional view of the radially pressurized pipe described in Example 1;

[0025] Fig. 2 This is a transverse sectional view of the radially pressurized pipe described in Example 1;

[0026] The numbers in the diagram are: 1. Sleeve to be tested; 2. Liner. Detailed Implementation

[0027] The present invention provides a radially pressurized pipe specimen, including a sleeve to be tested and a liner, wherein the liner is disposed inside the sleeve to be tested, and an interference fit is formed between the sleeve to be tested and the liner.

[0028] Furthermore, the inner diameter of the sleeve to be tested is smaller than the outer diameter of the liner, and the length of the sleeve to be tested is smaller than the length of the liner.

[0029] Furthermore, the central axis of the sleeve to be tested and the liner are the same along the length direction.

[0030] Furthermore, the material of the sleeve to be tested is selected from one of metal, non-metal, or composite materials;

[0031] The liner is made of a material selected from metal, non-metal, or composite material.

[0032] This invention provides a method for preparing the above-mentioned radially pressurized pipe, comprising the following steps:

[0033] The sleeve to be tested is placed on the liner, and uniform pressure is applied to the inner side of the sleeve to form an interference fit with the liner.

[0034] In one embodiment of the present invention, before applying uniform pressure to the inner surface of the sleeve to be tested, the selection of the interference fit of the sleeve to be tested and the liner is calculated, and then the state of the pressure surface of the sleeve to be tested is simulated and calculated using the finite element analysis method.

[0035] In one embodiment of the present invention, an interference fit between the pipe to be tested and the liner is achieved through mechanical fit, thermal fit, or cooling fit.

[0036] In one embodiment of the present invention, pressure is applied by a hydraulic press or similar device.

[0037] This invention provides an application of radially compressed pipeline in simulating pipeline performance under different pressure conditions.

[0038] In one embodiment of the present invention, the application is the application of radially pressurized pipelines in simulating the corrosion resistance of pipelines under different pressure conditions.

[0039] Specifically: First, select appropriate pipe materials and interference fit sleeve materials according to experimental requirements; during the material selection process, it is necessary to comprehensively consider the material's elastic modulus E, Poisson's ratio ν, coefficient of thermal expansion α, and other physicochemical parameters, as these parameters will affect the interference fit pressure and subsequent corrosion performance; integrate the physicochemical information of the selected materials to ensure the accuracy and completeness of the data;

[0040] Based on the physicochemical parameters of the selected material and the experimental requirements, the interference fit is calculated; then, the state of the pressure surface of the casing under test is simulated and calculated using the finite element analysis method.

[0041] Based on the finite element analysis results, select appropriate mechanical fit, thermal fit or cooling fit methods to precisely fit the interference fit sleeve and the liner.

[0042] After the sleeve and liner to be tested are fitted together, a corrosion performance test is conducted.

[0043] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0044] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do 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. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0047] Example 1

[0048] This embodiment provides a radially compressed pipe specimen, such as... Figs. 1-2 The device includes a sleeve 1 to be tested and a liner 2. The liner 2 is disposed inside the sleeve 1 to be tested, and an interference fit is formed between the sleeve 1 to be tested and the liner 2. The inner diameter of the sleeve 1 to be tested is smaller than the outer diameter of the liner 2, and the length of the sleeve 1 to be tested is smaller than the length of the liner 2.

[0049] Furthermore, the central axis of the sleeve 1 and the liner 2 along the length direction is the same; the material of the sleeve 1 is selected from one of metal, non-metal or composite material; the material of the liner 2 is selected from one of metal, non-metal or composite material.

[0050] During preparation, the sleeve 1 to be tested is fitted onto the liner 2, and pressure is applied by a hydraulic press (or a press) to make it form an interference fit with the inner liner 2, thus obtaining a radially pressurized pipe specimen;

[0051] Example 2

[0052] This embodiment aims to provide an application of radially compressed pipelines: simulating the corrosion resistance of pipelines under different pressure conditions.

[0053] This embodiment aims to provide an example of using 12CrMoV as the casing and SA210-C as the liner to be tested, in order to evaluate the corrosion performance of the liner under specific conditions. The following are the detailed implementation steps and results:

[0054] (S1) 12Cr1MoV was used as the sleeve to be tested and SA210-C was used as the liner; the elastic modulus of the sleeve to be tested was 214 GPa and the Poisson's ratio was 0.25; the elastic modulus of the liner was 211 GPa and the Poisson's ratio was 0.286.

[0055] (S2) Select the outer diameter of the sleeve to be tested as 47mm and the inner diameter as 34mm; select the inner diameter of the liner as 24mm; considering that the required mating surface pressure is less than 10MPa, the minimum interference fit can be calculated as follows:

[0056] When the pressure is 10 MPa:

[0057]

[0058]

[0059] δ min =e amin +e imin

[0060] =0.0107mm;

[0061] Where, q a q represents the diameter ratio of the sleeve to be tested. i E represents the diameter ratio of the liner. a Let Ei be the elastic modulus of the sleeve to be tested, and Ei be the elastic modulus of the liner. a Let v be the Poisson's ratio of the bushing to be tested. i p is the Poisson's ratio of the liner. f To accommodate the surface pressure, d2 is the inner diameter of the sleeve to be measured;

[0062] To ensure stability and accuracy during the experiment, and considering factors such as the possible decrease in interference after heating and changes in elastic modulus, an interference of 0.01 mm was ultimately selected.

[0063] (S3) Finite Element Analysis Simulation: The finite element analysis method was used to simulate the pressure surface state of the mating pipeline under test conditions. First, the engineering material library was imported, and material cards for SA210-C and 12Cr1MoV were created. A physical model was built according to the selected dimensions, and a mesh was generated with a global size of 0.1 mm, ensuring a mesh quality of 0.6 or higher. The simulated pressure p1 at the mating surface was calculated to be 8.882 MPa.

[0064] (S4) Precision machining technology is employed to ensure the surface condition and dimensional accuracy of the sleeve and liner under test. Based on the calculated interference fit, an appropriate mechanical fitting method (a hydraulic press is used in this embodiment) is used to precisely fit the sleeve and liner. During the fitting process, parameters such as temperature and pressure are controlled to ensure the quality and accuracy of the fit. After fitting, a tensile test is performed on the sample, and the pull-out failure force is found to be 10745.680 N. The calculated pressure on the mating surface is 9.126 MPa; the error between this result and the result obtained from the finite element analysis is less than 5%.

[0065] (S5) After the casing and liner to be tested are fitted together, a corrosion performance test is conducted.

[0066] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the interpretation of the present invention, without departing from the scope of the invention, should be within the protection scope of the present invention.

Claims

1. An application of a radially compressed pipeline in simulating pipeline performance under different pressure conditions, characterized in that, The application is the simulation of the corrosion resistance performance of radially compressed pipelines under different pressure conditions. First, select appropriate pipe materials and interference fit sleeve materials according to experimental requirements; Based on the physicochemical parameters of the selected material and the experimental requirements, the interference fit is calculated; then, the state of the pressure surface of the casing under test is simulated and calculated using the finite element analysis method. Based on the finite element analysis results, select appropriate mechanical fit, thermal fit or cooling fit methods to precisely fit the interference fit sleeve and the liner. After the sleeve and liner to be tested are fitted together, a corrosion performance test is conducted. The radially pressurized pipeline includes a test sleeve and a liner, with the liner disposed inside the test sleeve, and an interference fit formed between the test sleeve and the liner.

2. The application of a radially compressed pipeline according to claim 1 in simulating pipeline performance under different pressure conditions, characterized in that, The inner diameter of the sleeve to be tested is smaller than the outer diameter of the liner, and the length of the sleeve to be tested is smaller than the length of the liner.

3. The application of the radially compressed pipeline according to claim 2 in simulating pipeline performance under different pressure conditions, characterized in that, The central axis of the sleeve and the liner to be tested is the same along the length direction.

4. The application of the radially compressed pipeline according to claim 1 in simulating pipeline performance under different pressure conditions, characterized in that, The material of the sleeve to be tested is selected from metal, non-metal or composite material.

5. The application of a radially compressed pipeline according to claim 1 in simulating pipeline performance under different pressure conditions, characterized in that, The liner is made of a material selected from metal, non-metal, or composite material.

6. The application of a radially compressed pipeline according to claim 1 in simulating pipeline performance under different pressure conditions, characterized in that, The method for preparing a radially pressurized conduit includes the following steps: The sleeve to be tested is placed on the liner, and uniform pressure is applied to the inner side of the sleeve to form an interference fit with the liner.

7. The application of a radially compressed pipeline according to claim 6 in simulating pipeline performance under different pressure conditions, characterized in that, Before applying uniform pressure to the inner surface of the casing to be tested, the selection of the interference fit of the casing and liner to be tested is calculated, and then the state of the pressure surface of the casing to be tested is simulated using the finite element analysis method.

8. The application of a radially compressed pipeline according to claim 6 in simulating pipeline performance under different pressure conditions, characterized in that, An interference fit between the pipe to be tested and the liner is achieved through mechanical fit, thermal fit, or cooling fit.

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