Stress ring corrosion testing equipment

Abstract

The utility model discloses stress ring corrosion testing equipment, which belongs to the technical field of testing equipment and comprises a hydrogen sulfide conveying component and a plurality of testing components. The hydrogen sulfide conveying assembly comprises a hydrogen sulfide gas cylinder and a hydrogen sulfide hose. The test assembly comprises stress rings and a sealed container, the sealed container covers the test piece in the stress rings, an air inlet and an air outlet are formed in the sealed container, and the stress rings are connected in series through the air inlet and the air outlet. The gas inlets and the gas outlets of the multiple sealed containers are communicated with each other, and the multiple test assemblies can be connected in series through the pipelines, so that the single hydrogen sulfide conveying assembly can convey hydrogen sulfide gas to the multiple test assemblies at the same time, and then the single test equipment has the capability of carrying out tests of multiple test groups at the same time. The test space is saved, the utilization rate of the hydrogen sulfide gas is improved, and the practical cost of test equipment is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of test equipment, in particular to a stress ring corrosion test equipment. Background Art

[0002] Metal in H 2 The sulfide stress cracking (SSC) test method in H2O2 environment is an experimental method used to evaluate the corrosion resistance of materials under the combined action of stress and corrosive environment. This test is often used to study the stress corrosion cracking behavior of metal materials in sulfide corrosive media and stress conditions. The purpose of this test method is to evaluate the corrosion resistance of metal materials in H2O2-containing environments. 2 The stress corrosion cracking resistance in S environment determines whether the material is suitable for use in such corrosive environment; as part of quality control, the SSC resistance of materials and products is verified through standardized test methods to ensure that the materials and products comply with relevant specifications and standards.

[0003] The standard tensile test in this test uses Method A in NACE TM0177-2016. The main test process is to use a stress ring to apply stress to the standard specimen and maintain the stress state. During this process, H2 is introduced into the sealed container. 2 S gas, ensure that the container is filled with H 2 The concentration of S meets the specified requirements. The test environment is usually carried out at room temperature and the standard test time is 720 hours. After the test, the sample is magnified 10 times to visually observe whether there are cracks in the gauge length part. The cracked sample is analyzed. If there are cracks or the sample is completely broken, it is unqualified, unless it is proved that the cracks are not caused by sulfide stress cracking.

[0004] The current stress ring corrosion test equipment controls a stress ring through a two-way regulating valve and a gas flow rate regulating valve respectively. The equipment occupies a large test space and causes waste of hydrogen sulfide gas. In order to improve the test efficiency, the stress ring test of oil casing requires multiple groups to be done at the same time, resulting in a high cost of using the test equipment. Utility Model Content

[0005] The utility model aims to provide a stress ring corrosion testing device to solve the above problems in the prior art.

[0006] A stress ring corrosion testing device is provided, comprising:

[0007] A hydrogen sulfide delivery assembly, comprising a hydrogen sulfide gas cylinder and a hydrogen sulfide hose, one end of the hydrogen sulfide hose being connected to the hydrogen sulfide gas cylinder;

[0008] A plurality of test assemblies, wherein the test assemblies include a stress ring and a sealed container, wherein the sealed container covers the test piece in the stress ring, and an air inlet and an air outlet are provided on the sealed container. The plurality of stress rings are connected in series via the air inlet and the air outlet, the air inlet at the end of the series structure is connected to the other end of the hydrogen sulfide hose, and the air outlet at the end of the series structure is used to discharge the gas.

[0009] Furthermore, it also includes an equipment cover, which covers the multiple test components inside. The equipment cover is used to prevent the hydrogen sulfide gas from spreading into the air of the surrounding environment when hydrogen sulfide gas leaks from the sealed container, thereby endangering the environment and test personnel.

[0010] Furthermore, it also includes an alkali liquid pool, which is located outside the equipment housing and is connected to the gas outlet at the end of the series structure. After the hydrogen sulfide gas circulates in the multiple sealed containers, the hydrogen sulfide gas is discharged into the alkali liquid pool, and the alkali liquid pool is used to treat excess hydrogen sulfide gas.

[0011] Furthermore, an exhaust device is provided on the outer cover of the equipment. When hydrogen sulfide leaks from the sealed container, the exhaust device can extract the hydrogen sulfide gas in the outer cover of the equipment, thereby improving the safety of the equipment.

[0012] Furthermore, a one-way valve is provided between the alkali liquid pool and the gas outlet at the end of the series structure. The one-way valve is used to prevent the liquid in the alkali liquid pool from flowing back into the sealed container through the pipeline when the air pressure in the sealed container is insufficient, thereby affecting the test results.

[0013] Furthermore, it also includes an inert gas delivery assembly, which includes an inert gas cylinder and an inert gas hose, one end of the inert gas hose is connected to the inert gas cylinder, and the other end of the inert gas hose is connected to the hydrogen sulfide hose through a tee, and the gas outlet end of the tee is connected to the gas inlet at the end of the series structure. After the stress corrosion test is completed, the inert gas cylinder delivers inert gas to the sealed container through the inert gas hose, squeezes out the hydrogen sulfide gas in the sealed container and the pipeline between the sealed containers, and prevents the residual hydrogen sulfide gas from escaping when the equipment is disassembled.

[0014] Furthermore, a two-way regulating valve is provided in the three-way valve for controlling the opening and closing of the hydrogen sulfide hose end and the inert gas hose end of the three-way valve. Since the hydrogen sulfide delivery component and the inert gas delivery component are in an interval working state in time, the two-way regulating valve can only open one air inlet end at a time, while the other air inlet end is closed, so the flow of hydrogen sulfide gas and inert gas at the three-way air outlet end can be conveniently controlled, and the control method and control structure are simple and efficient.

[0015] Furthermore, a gas flow rate regulating valve is provided on the inert gas hose, and the gas flow rate regulating valve can independently control the flow of the inert gas in the tee, and also controls the flow rate of the inert gas.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] By interconnecting the gas inlets and gas outlets of multiple sealed containers, multiple test assemblies can be connected in series through pipelines, so that a single hydrogen sulfide delivery assembly can simultaneously deliver hydrogen sulfide gas to multiple test assemblies, thereby enabling a single test device to simultaneously conduct multiple test group tests. This saves test space, improves the utilization rate of hydrogen sulfide gas, and reduces the practical cost of the test equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present drawings or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present drawings. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of a stress ring corrosion testing device;

[0020] Figure 2 This is a partial structural schematic diagram of a stress ring corrosion testing device.

[0021] In the figure: 1. Hydrogen sulfide delivery assembly; 11. Hydrogen sulfide cylinder; 12. Hydrogen sulfide hose; 2. Test assembly; 21. Stress ring; 22. Sealed container; 221. Air inlet; 222. Air outlet; 3. Equipment cover; 4. Alkali solution pool; 41. One-way valve; 5. Inert gas delivery assembly; 51. Inert gas cylinder; 52. Inert gas hose; 521. Gas flow rate regulating valve; 6. Tee; 61. Two-way regulating valve. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0023] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0024] However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of substantially the same structures may be omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. In addition, the drawings and the following description are provided to enable those skilled in the art to fully understand the present application and are not intended to limit the subject matter described in the claims.

[0025] See also Figure 1-2 As shown, in an embodiment of the utility model, a stress ring corrosion test device includes a hydrogen sulfide delivery component 1 and a plurality of test components 2. The hydrogen sulfide delivery component 1 includes a hydrogen sulfide gas cylinder 11 and a hydrogen sulfide hose 12, one end of the hydrogen sulfide hose 12 is connected to the hydrogen sulfide gas cylinder 11. The test component 2 includes a stress ring 21 and a sealed container 22, the sealed container 22 covers the test piece in the stress ring 21, and an air inlet 221 and an air outlet 222 are provided on the sealed container 22. The plurality of stress rings 21 are connected in series through the air inlet 221 and the air outlet 222, the air inlet 221 at the end of the series structure is connected to the other end of the hydrogen sulfide hose 12, and the air outlet 222 at the end of the series structure is used to discharge the gas.

[0026] A plurality of stress rings 21 are fixed and arranged by a support frame, and the test specimen is located between the two stress clamping ends of the stress ring 21. The two clamping ends apply stress to the specimen, and the sealed container 22 provides a relatively closed space for the specimen. The hydrogen sulfide gas cylinder 11 introduces hydrogen sulfide gas into the hydrogen sulfide hose 12, and then the hydrogen sulfide gas is transported to the sealed container 22 on the first stress ring 21 through the hydrogen sulfide hose 12. The hydrogen sulfide gas fills the sealed container 22 and corrodes the specimen. During the test, the hydrogen sulfide gas maintains a flowing state and passes through each of the sealed containers 22 connected in series in turn, and is finally discharged from the gas outlet 222 at the end of the series structure. After 720 hours of continuous action, the cracks in the test part of the sample are observed using a detection tool.

[0027] The test equipment also includes an equipment cover 3, which covers the multiple test components 2. Since hydrogen sulfide gas is highly toxic and colorless and difficult to detect, it is difficult to detect whether the sealed container 22 and the pipes connecting the sealed container 22 are leaking. In order to prevent the leaked hydrogen sulfide gas from spreading into the air, it is necessary to set the equipment cover 3 for sealing and blocking so that the multiple test components 2 are all located in a closed space.

[0028] After hydrogen sulfide gas circulates in sequence from multiple sealed containers 22, it needs to be discharged. In order to collect and process hydrogen sulfide gas, an alkali liquid pool 4 is set outside the equipment cover 3. The alkali liquid pool 4 can neutralize hydrogen sulfide to generate dissolved salt, thereby preventing hydrogen sulfide from being discharged into the air. The sample test and hydrogen sulfide treatment process are carried out automatically without human intervention.

[0029] Furthermore, a one-way valve 41 is provided between the alkali liquid pool 4 and the gas outlet 222 at the end of the series structure. The one-way valve 41 allows gas or liquid to flow in only one direction. The one-way valve 41 is used to prevent the liquid in the alkali liquid pool 4 from flowing back into the sealed container 22 through the pipeline when the air pressure in the sealed container 22 is insufficient, thereby affecting the test results.

[0030] The detection equipment also includes an inert gas delivery component 5, which includes an inert gas cylinder 51 and an inert gas hose 52. The inert gas is preferably nitrogen. The inert gas cylinder 51 passes nitrogen into the inert gas hose 52, and the nitrogen is then delivered to the tee 6 through the inert gas hose 52. After the test is completed, the hydrogen sulfide gas in the multiple sealed containers 22 needs to be discharged. At this time, the inert gas cylinder 51 can be opened to deliver nitrogen, and the hydrogen sulfide gas in the sealed container 22 is squeezed and emptied by nitrogen to prevent the residual hydrogen sulfide gas from escaping when the sealed container 22 and the pipeline connecting the sealed container 22 are disassembled.

[0031] A two-way regulating valve 61 is provided in the tee 6, which is used to control the opening and closing of the hydrogen sulfide hose 12 end and the inert gas hose 52 end of the tee 6. The two-way regulating valve 61 blocks the two air inlet ends of the tee 6 by displacement, thereby realizing the opening and closing of the two air inlet ends respectively. When the two-way regulating valve 61 moves to the inert gas hose 52 end of the tee 6, the hydrogen sulfide hose 12 end of the tee 6 is connected with the air outlet end, and hydrogen sulfide gas is delivered to the sealed container 22, and it is in a normal test state at this time. When the two-way regulating valve 61 moves to the hydrogen sulfide hose 12 of the tee 6, the inert gas hose 52 end of the tee 6 is connected with the air outlet end, and nitrogen is delivered to the sealed container 22, and it is in a state of ending the test and emptying the internal hydrogen sulfide gas.

[0032] The inert gas hose 52 is provided with a gas flow rate regulating valve 521, which can independently control the flow of nitrogen in the tee 6 and the flow rate of nitrogen, thereby regulating the gas pressure in the sealed container 22. By regulating the nitrogen flow rate, the gas pressure in the sealed container 22 is prevented from being too high, thereby preventing the connection between the sealed container 22 and the stress ring 21 from being damaged or leaking.

[0033] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A stress ring corrosion testing device, characterized in that: include: A hydrogen sulfide transport assembly (1), comprising a hydrogen sulfide gas cylinder (11) and a hydrogen sulfide hose (12), wherein one end of the hydrogen sulfide hose (12) is connected to the hydrogen sulfide gas cylinder (11); A plurality of test assemblies (2), wherein the test assemblies (2) include a stress ring (21) and a sealed container (22), wherein the sealed container (22) covers the test piece inside the stress ring (21), and wherein an air inlet (221) and an air outlet (222) are provided on the sealed container (22), wherein the plurality of stress rings (21) are connected in series via the air inlet (221) and the air outlet (222), wherein the air inlet (221) at the end of the series structure is connected to the other end of a hydrogen sulfide hose (12), and the air outlet (222) at the end of the series structure is used to discharge gas.

2. A stress ring corrosion testing device according to claim 1, characterized in that: It also includes a device housing (3), wherein the device housing (3) covers a plurality of test components (2) inside.

3. A stress ring corrosion testing device according to claim 2, characterized in that: It also comprises an alkali liquid pool (4), the alkali liquid pool (4) is located outside the equipment outer cover (3), and the alkali liquid pool (4) is connected to the air outlet (222) at the end of the series structure.

4. A stress ring corrosion testing device according to claim 2, characterized in that: The equipment outer cover (3) is provided with an exhaust device.

5. The stress ring corrosion testing device according to claim 3, characterized in that: A one-way valve (41) is provided between the alkali liquid pool (4) and the gas outlet (222) at the end of the series structure.

6. The stress ring corrosion testing device according to claim 1, characterized in that: It also includes an inert gas delivery assembly (5), which includes an inert gas cylinder (51) and an inert gas hose (52), one end of the inert gas hose (52) is connected to the inert gas cylinder (51), the other end of the inert gas hose (52) is connected to the hydrogen sulfide hose (12) via a tee (6), and the gas outlet end of the tee (6) is connected to the gas inlet (221) at the end of the series structure.

7. A stress ring corrosion testing device according to claim 6, characterized in that: A two-way regulating valve (61) is arranged in the tee (6) for controlling the opening and closing of the hydrogen sulfide hose (12) end and the inert gas hose (52) end of the tee (6).

8. The stress ring corrosion testing device according to claim 6, characterized in that: The inert gas hose (52) is provided with a gas flow rate regulating valve (521).

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