A pipe flow type experimental device for simulating erosion corrosion of a weld in a pipeline

Abstract

The utility model discloses a kind of pipe flow type experimental devices simulating pipeline internal weld scouring corrosion, including cooling loop part, experimental loop part, test system;In the main pipeline of experimental loop part, three test pipe sections are provided in parallel along the solution flow direction, each test pipe section is sequentially provided with valve, flowmeter, electrochemical test pipe section II, electrochemical test pipe section I, weight loss test pipe section II, weight loss test pipe section I, each test pipe section is different diameter;And experimental pipe section has simulated weld shape, can realize the electrochemical test of multiple samples at different positions of weld under scouring condition, weight loss test, and galvanic corrosion test between samples.Compared with traditional scouring corrosion technology, the utility model has small floor area, low operating cost.The utility model not only changes structure, but also changes the material of test pipe section, with the advantages of efficient, reliable, easy to install etc.

Description

Technical Field

[0001] This utility model belongs to the field of pipeline inner wall detection technology, specifically relating to a pipe flow experimental device for simulating erosion corrosion of weld seams inside pipelines. Background Technology

[0002] To detect the erosion corrosion behavior of the inner wall of a pipeline, a pipe flow test device is often used to realistically simulate the axial erosion corrosion behavior of the inner wall of the pipeline under actual pipeline flow conditions.

[0003] Traditional tubular flow apparatuses are bulky, costly to construct, and have long experimental cycles, making it impossible to conduct simultaneous electrochemical and weight loss tests on multiple samples. Existing experimental setups only have a single test tube section, capable of simulating erosion corrosion on the inner wall of a single-diameter pipe and only capable of simulating simple shapes of the pipe's inner wall, failing to simulate weld reinforcement in pipes with unique internal shapes. Furthermore, the test section is often made of metallic materials, which are prone to ion adsorption and galvanic corrosion with the test material. Utility Model Content

[0004] This invention provides a pipe-flow type experimental device for simulating erosion corrosion of weld seams inside pipelines. The technical problem to be solved is that existing pipe-flow type erosion corrosion experimental devices are bulky, have high construction costs, cannot simultaneously conduct electrochemical tests on the erosion corrosion of the inner walls of multi-diameter pipelines, and cannot well simulate erosion corrosion of different planes of weld seam reinforcement.

[0005] To address the above technical problems, this utility model provides a pipe-flow experimental device for simulating erosion corrosion of weld seams in pipelines. The device is characterized by: an experimental circuit section, in which multiple test pipe sections of different diameters are connected in parallel along the solution flow direction in the main pipe of the experimental circuit section. Each test pipe section is sequentially equipped with a valve, a flow meter, an electrochemical test pipe section, and a weightlessness test pipe section. Each electrochemical test pipe section consists of a wire, a working electrode sample, a counter electrode sample, and a reference electrode. The working electrode sample includes a base material sample I, a heat-affected zone sample I, a weld seam sample, a simulated weld, a heat-affected zone sample II, and a base material sample II, used to simulate the weld seam shape.

[0006] Furthermore, a display screen and control panel are also installed on the main pipeline.

[0007] Furthermore, the electrode sample, reference electrode, and working electrode sample are positioned opposite each other and installed on the inner wall of the test tube section.

[0008] Furthermore, the electrochemical test tubes, except for the samples, are all made of non-metallic materials.

[0009] Furthermore, the back sides of the counter electrode sample, reference electrode, and working electrode sample are connected to the test system via wires.

[0010] Furthermore, the testing system consists of an electrochemical workstation and a PC.

[0011] Furthermore, the experimental circuit also includes a solution tank, a heating jacket, a submersible pump, and a solution. The solution tank is filled with solution, and a heating jacket is installed outside the solution tank. The submersible pump is installed inside the solution tank and is used to connect to the inlet end of the main pipeline of the experimental circuit.

[0012] Furthermore, the control panel is connected to a thermocouple placed within the solution.

[0013] Furthermore, it also includes a cooling circuit, which includes a pipeline pump and a cooler. The inlet of the pipeline pump extends into the solution through a connecting pipe, and the outlet of the pipeline pump is connected to the inlet of the cooler through a connecting pipe. The outlet of the cooler is connected to the solution.

[0014] Beneficial Effects: The experimental circuit of this invention features multiple pipe diameter channels and non-metallic material test sections, enabling simultaneous erosion corrosion testing of the inner walls of multi-diameter pipes while eliminating the influence of galvanic corrosion between different metals. The test sections incorporate simulated weld shapes, allowing for electrochemical testing, weight loss testing, and galvanic corrosion testing of multiple samples at different weld locations under erosion conditions. Compared to traditional erosion corrosion techniques, this invention occupies less space and has lower operating costs. This invention not only changes the structure but also the material of the test sections, offering advantages such as high efficiency, reliability, and easy installation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the electrochemical test tube section.

[0017] Figure 3 This is a schematic diagram of the working electrode. Detailed Implementation

[0018] To make the purpose, content and advantages of this utility model clearer, the specific embodiments of this utility model will be described in further detail below.

[0019] This invention proposes a pipe-flow experimental device for simulating erosion corrosion of weld seams in pipelines, comprising a cooling circuit, an experimental circuit, and a testing system 8. In the cooling circuit, the inlet of a pipe pump 1 extends into solution 7 via a connecting pipe, and its outlet is connected to the inlet of a cooler 2 via a connecting pipe. The outlet of the cooler 2 is connected to solution 7. The pipe pump 1 acts as a power unit, driving solution 7 into the cooling circuit for cooling. A submersible pump 5 is connected to solution 7 via its inlet, and its outlet is connected to the inlet of the experimental circuit. Electrochemical test sections and weightlessness test sections are sequentially distributed within the test sections. The sample in the electrochemical test section is connected to the testing system 8 via a wire, and the outlet of the experimental circuit is connected to solution 7.

[0020] Specifically, the pipe flow experimental device for simulating erosion corrosion of weld seams in pipelines includes a pipeline pump 1, a cooler 2, a solution tank 3, a heating jacket 4, a submersible pump 5, a thermocouple 6, a solution 7, a testing system 8, test pipe section I 15, test pipe section II 16, test pipe section III 17, a display screen 18, and a control panel 19.

[0021] The pipeline pump 1 and cooler 2 form the cooling circuit. The inlet of the pipeline pump 1 is connected to one end of the pipeline, and the other end of the pipeline extends into the bottom of the solution 7 in the solution tank 3. The outlet of the pipeline pump 1 is connected to the inlet of the cooler 2 through the pipeline, and the experimental solution in the cooler 2 is introduced into the solution 7 through the outlet end. At the same time, the cooler 2 is connected to the external coolant, thereby achieving effective cooling of the solution 7.

[0022] The experimental circuit consists of solution tank 3, heating jacket 4, submersible pump 5, thermocouple 6, solution 7, test tube section I 15, test tube section II 16, test tube section III 17, display screen 18, and control panel 19. The submersible pump 5 is located at the bottom of solution tank 3, and the outlet of the submersible pump 5 is connected to the inlet end of the main pipe of the experimental circuit.

[0023] In the main pipeline of the experimental loop, three test pipe sections are connected in parallel along the flow direction of the solution. Each test pipe section is equipped with a valve 14, a flow meter 13, an electrochemical test pipe section II12, an electrochemical test pipe section I11, a weightlessness test pipe section II10, and a weightlessness test pipe section I9 in sequence. The valve 14 is installed at the front end of the flow meter 13, and the flow meter 13 is connected to the pipeline in the experimental loop to display the flow rate in the pipeline in real time.

[0024] A display screen 18 and a control panel 19 are also installed on the main pipeline.

[0025] The innovation of this utility model is that the electrochemical test tube section is composed of a wire 20, a working electrode sample 21, a counter electrode sample 22, and a reference electrode 23. The working electrode sample includes a base material sample I24, a heat-affected zone sample I25, a weld zone sample 26, a simulated weld 27, a heat-affected zone sample II28, and a base material sample II29, which are used to simulate the weld shape.

[0026] The experimental circuit is equipped with various pipe diameter channels and non-metallic material test pipe sections, which can realize the erosion corrosion test of the inner wall of multiple pipe diameters at the same time and eliminate the influence of galvanic corrosion between different metals.

[0027] Electrode sample 22, reference electrode 23, and working electrode sample 21 are positioned opposite each other and installed on the inner wall of the test tube section. The back of each electrode sample is connected to the test system 8 via wires. Except for the samples, the electrochemical test tube section is made of non-metallic material, which can avoid galvanic corrosion between the tube material and the samples.

[0028] The testing system consists of an electrochemical workstation and a PC, which is an existing structure and is not an innovation of this utility model. It is used for data monitoring of samples.

[0029] The work process is as follows:

[0030] The working electrode sample 21 is encapsulated, and a sample containing the base material area, heat-affected zone, and weld area (24-29) is assembled. The counter electrode 22 and reference electrode 23 are connected to form a three-electrode system, which is then connected to the test system 8 via wire 20. The pipeline pump 1 is turned on to pump the solution 7 from the solution tank 3 into the cooler 2 for temperature regulation. The cooled solution is then returned to the tank, forming a circulating cooling system. The heating jacket 4 is activated as needed, working in conjunction with the thermocouple 6 to monitor the temperature. The submersible pump 5 is activated to pump the solution from the bottom of the tank into the experimental loop, flowing sequentially through valve 14 and flow meter 13 to control the flow rate. Data is monitored in real-time by the display screen 18 and control panel 19. The solution passes through the electrochemical test tubes (11, 12) and the weightlessness test tubes (9, 10) to simulate the erosion corrosion environment under different pipe diameters and weld reinforcement conditions. In the electrochemical test tubes, the working electrode 21 contacts the solution, generating an electrochemical signal, which is collected and analyzed in real-time by the test system 8. The experimental solution is returned to the solution tank 3 to form a closed-loop circulation. After the experiment, the pump and heating / cooling system were turned off, and the weightless sample was taken out for subsequent analysis to complete the multi-parameter erosion corrosion simulation test.

Claims

1. A pipe flow experimental device for simulating erosion corrosion of weld seams inside pipelines, characterized in that: The experimental circuit includes a main pipeline with multiple test tube sections of different diameters connected in parallel along the solution flow direction. Each test tube section is equipped with a valve, a flow meter, an electrochemical test tube section, and a weightlessness test tube section in sequence. Each electrochemical test tube section consists of a wire, a working electrode sample, a counter electrode sample, and a reference electrode. The working electrode samples include base material sample I, heat-affected zone sample I, weld zone sample, simulated weld, heat-affected zone sample II, and base material sample II, which are used to simulate the weld shape.

2. The pipe flow experimental device for simulating erosion corrosion of weld seams in pipelines according to claim 1, characterized in that: A display screen and control panel are also installed on the main pipeline.

3. The pipe flow experimental device for simulating erosion corrosion of weld seams in pipelines according to claim 1, characterized in that: The electrode sample, reference electrode, and working electrode sample are positioned opposite each other and installed on the inner wall of the test tube section.

4. The pipe flow experimental device for simulating erosion corrosion of weld seams in pipelines according to claim 1, characterized in that: Except for the sample, all sections of the electrochemical test tube are made of non-metallic materials.

5. The pipe flow experimental device for simulating erosion corrosion of weld seams in pipelines according to claim 1, characterized in that: The back of the counter electrode sample, reference electrode, and working electrode sample are connected to the test system via wires.

6. The pipe flow experimental device for simulating erosion corrosion of weld seams in pipelines according to claim 5, characterized in that: The testing system consists of an electrochemical workstation and a PC.

7. The pipe flow experimental device for simulating erosion corrosion of weld seams in pipelines according to claim 1, characterized in that: The experimental circuit also includes a solution tank, a heating jacket, a submersible pump, and a solution. The solution tank is filled with solution, and a heating jacket is installed outside the solution tank. The submersible pump is installed inside the solution tank and is used to connect to the inlet end of the main pipeline of the experimental circuit.

8. The pipe flow experimental device for simulating erosion corrosion of weld seams in pipelines according to claim 2, characterized in that: The control panel is connected to a thermocouple placed in the solution.

9. The pipe flow experimental device for simulating erosion corrosion of weld seams in pipelines according to claim 1, characterized in that: It also includes a cooling circuit, which includes a pipeline pump and a cooler. The inlet of the pipeline pump extends into the solution through a connecting pipe, and the outlet of the pipeline pump is connected to the inlet of the cooler through a connecting pipe. The outlet of the cooler is connected to the solution.

10. A pipe flow experimental device for simulating erosion corrosion of weld seams in pipelines according to any one of claims 1-9, characterized in that: The test tube section has three segments.

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