CN112393970A - Method and device for evaluating stress corrosion cracking sensitivity of pipe - Google Patents
Method and device for evaluating stress corrosion cracking sensitivity of pipe Download PDFInfo
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Abstract
The invention discloses a method and a device for evaluating the stress corrosion cracking sensitivity of a pipe, wherein two ends of a test pipe are hermetically provided with end sockets, a first pipeline is communicated with an inner cavity of the test pipe from one end of the test pipe, one end of a second pipeline penetrates through the end sockets from the other end of the test pipe to be communicated with the inner cavity of the test pipe, the other end of the second pipeline is connected with an air supply unit, a first control valve is arranged at the part of the first pipeline positioned outside the test pipe, a second control valve is arranged at the part of the second pipeline between the test pipe and the air supply unit, a monitoring assembly is arranged at the maximum strain position of the outer wall of the test pipe, and the air supply unit, the monitoring assembly, the first control valve and the second control valve are all connected with a control unit. The stress corrosion cracking resistance of the pipe under the working condition environment is comprehensively simulated, and the problem of evaluating the stress corrosion cracking resistance of the pipe is effectively solved.
Description
Technical Field
The invention relates to the field of evaluation of material stress corrosion cracking sensitivity, in particular to a method and a device for evaluating the stress corrosion cracking sensitivity of a pipe.
Background
In recent years, the bimetal composite pipe is gradually becoming an economic safety anticorrosion measure for solving the problem of high-corrosivity oil gas gathering and transportation, and is widely applied to oil fields. The corrosion-resistant alloy layer of the bimetal composite pipe is contacted with a corrosion medium in the pipeline, and the quality of the corrosion resistance of the bimetal composite pipe directly determines the service life of the pipe. Stress corrosion cracking is taken as a main failure mode of the corrosion-resistant alloy material, and sensitivity evaluation of the stress corrosion cracking is always taken as a main means of material environmental adaptability. In the production process of the bimetal composite pipe, the thin-wall corrosion-resistant alloy layer close to the joint interface is polluted by base materials to a greater or lesser extent, and the corrosion resistance is reduced. When the evaluation work is carried out, the testing personnel have the troublesome problem that the sample is difficult to process and load stress.
1) Stress corrosion cracking evaluation is generally carried out by strain control by loading the actual yield strength of the material to evaluate the cracking sensitivity by a constant strain method according to the standard GB/T4157. However, due to the thin-wall property of the corrosion-resistant alloy layer, a mechanical sample is difficult to process, the mechanical property of the material is difficult to obtain, and particularly, the tensile property test of the inner coating of the metallurgical bonding composite pipe is difficult to test, and the stress corrosion cracking sensitivity evaluation test is difficult to develop.
2) If a bare sample is directly used for evaluation in the test, the corrosion-resistant alloy layer is difficult to effectively avoid a polluted layer due to insufficient processing allowance, and meanwhile, the sample with larger material ductility is difficult to process into a straight sample, so that the subsequent stress loading level control cannot be effective and accurate, and the stress corrosion cracking sensitivity evaluation test is difficult to develop.
3) The improved epoxy resin sealant prepared by the method such as the patent application No. 200810146186.6 is used for sealing and coating isolation of a polluted layer, the stress accurate loading can be influenced by the existence of the sealing coating when a sample is loaded with stress, the acceleration failure of the sealing coating can be caused by the existence of the stress in the test process, and the effectiveness and the accuracy of stress corrosion cracking evaluation cannot be guaranteed.
Disclosure of Invention
In order to solve the problems, the invention provides a method and a device for evaluating the stress corrosion cracking sensitivity of the pipe, which can avoid the processing problems of a mechanical sample and a corrosion sample in the stress corrosion cracking evaluation process, realize the effective loading and the whole-process accurate control of the stress level, comprehensively simulate the stress corrosion cracking resistance of the pipe under the working condition environment, and effectively solve the evaluation problem of the stress corrosion cracking resistance of the pipe.
In order to achieve the purpose, the invention adopts the following technical scheme:
a device for evaluating the stress corrosion cracking sensitivity of a pipe comprises a test pipe, a gas supply unit, a monitoring assembly and a control unit, first pipeline and second pipeline, experimental tubular product both ends seal installation has the head, first pipeline passes head and experimental tubular product inner chamber intercommunication from the one end of experimental tubular product, the other end of second pipeline passes head and experimental tubular product inner chamber intercommunication from the other end of experimental tubular product, the other end and the air feed unit of second pipeline are connected, first pipeline is equipped with first control valve in the part that is located experimental tubular product outside, the part between experimental tubular product and air feed unit is equipped with the second control valve on the second pipeline, the monitoring subassembly is used for measuring meeting an emergency and sets up in the maximum strain department of experimental tubular product outer wall, air feed unit, the monitoring subassembly, first control valve and second control valve all are connected with the control unit, experimental tubular product is one section bimetal composite pipe.
Preferably, the end parts of the end socket test pipes are in threaded connection, wherein the outer surface of the test pipe is provided with an external thread, and the inner surface of the end socket is provided with an internal thread matched with the external thread.
Preferably, the outer part of the test pipe is covered with a sealed buffer unit, the buffer unit is connected with a third pipeline, and a valve is arranged on the part, positioned outside the buffer unit, of the third pipeline.
Preferably, the end socket is arranged in the buffer unit through a support, and the test pipe is suspended in the buffer unit through the support.
Preferably, the device for evaluating the sensitivity of stress corrosion cracking of the pipe further comprises a post-processing unit, wherein the first pipeline and the third pipeline are both connected to the post-processing unit, and the post-processing unit can process the discharge fluid of the buffer unit and the test pipe.
Preferably, the first control valve and the second control valve are high-pressure pneumatic valves.
Preferably, the monitoring assembly employs a strain gauge.
The invention also provides a method for evaluating the sensitivity of stress corrosion cracking of the pipe, which is carried out by adopting the device for evaluating the sensitivity of stress corrosion cracking of the pipe, and comprises the following steps:
analysis of dependent variable: 1) measuring stress-strain curves of the bimetal composite pipe and the base pipe which are easy to obtain; 2) drawing a stress-strain curve of the corrosion-resistant alloy layer according to a formula 1 to obtain the yield strength R of the corrosion-resistant alloy layere corrosion resistant alloy layer(ii) a 3) According to yield strength Re corrosion resistant alloy layerCorresponding strain value xie corrosion resistant alloy layerSearching the same strain value xi by combining the stress-strain curve of the bimetal composite tubeComposite pipeCorresponding stress level σComposite pipe(ii) a 4) According to pipe stress level sigmaComposite pipeCalculating the initial air-adding amount of the test pipe (1) based on the strength design theory and the gas state equation;
in the formula: sigma is the stress level corresponding to the bimetal composite pipe, the base pipe and the corrosion-resistant alloy layer, and t is the thickness corresponding to the base pipe and the corrosion-resistant alloy layer.
Loading a test environment: injecting a test solution into the test pipe, heating the test solution to a test temperature, and introducing necessary corrosive gas;
test stress loading: setting gas injection amount according to the calculated gas filling amount of the test pipe, injecting gas into the test pipe by using the gas supply unit, and adjusting the actual gas injection amount according to the strain value of the test pipe measured by the monitoring assembly in the filling process to enable the strain value of the test pipe to reach the required value xiComposite pipeThen, starting test timing;
and (3) test stress maintenance: monitoring the strain value of the test pipe at any time in the test, and controlling the first control valve and the second control valve by using the control unit so as to adjust the air inflow and the air discharge of the test pipe and maintain the test pipe to reach the required strain level;
flaw detection of the pipe: after the test, carrying out full-pipe flaw detection on the test pipe, analyzing the crack generation condition of the pipe, and giving an evaluation result of the stress corrosion cracking sensitivity of the pipe.
Preferably, inert gas is injected into the test pipe when the test stress is loaded.
Compared with the prior art, the invention has the following beneficial technical effects:
the pipe stress corrosion cracking sensitivity evaluation device can directly utilize a test pipe (a section of bimetal composite pipe) to carry out a test, avoids the problem that a sample of a corrosion-resistant alloy layer is difficult to process when a corrosion-resistant alloy layer is directly adopted for carrying out the test, and simultaneously does not need to use a coating to seal and isolate a polluted layer; the stress of the outer wall of the test pipe can be monitored in real time through the monitoring assembly, the gas injection quantity of the test pipe is controlled according to the strain value measured by the monitoring assembly through the gas supply unit, the first pipeline, the second pipeline, the first control valve and the second control valve of the control unit, so that the test pipe reaches the required strain level to be tested, and the stress corrosion cracking sensitivity of the corrosion-resistant alloy layer of the bimetal composite pipe is evaluated; the two ends of the test pipe are hermetically provided with the end sockets, so that a corrosive solution, a gas medium and an environment temperature required by a test can be introduced by taking the test pipe as a test container to simulate the real working condition of the bimetal composite pipe, and meanwhile, the end sockets and the two ends of the test pipe are hermetically arranged and provided with the first control valve and the second control valve, so that the stress can be maintained in the test process to truly simulate the constant strain state of the pipe.
Furthermore, threaded connection is adopted between the end parts of the end socket test pipes, wherein external threads are arranged on the outer surfaces of the test pipes, internal threads matched with the external threads are arranged on the inner surfaces of the end sockets, and the connection mode has little influence on the bimetal composite pipes, so that the result is accurate and real.
Furthermore, even if the test pipe section is broken and the gas is leaked in the test, the gas can be sealed to prevent further leakage by arranging the buffer unit and the valve, and possible breakage of the test pipe section is controlled in the buffer unit, so that the test safety is guaranteed.
Furthermore, the post-processing unit can process the exhaust gas of the buffer unit and the test pipe, so that the test safety is ensured.
The method for evaluating the sensitivity of the stress corrosion cracking of the pipe avoids the difficulty of sample processing in the process of evaluating the stress corrosion cracking, simultaneously realizes effective loading of the stress level and accurate control of the whole process, comprehensively simulates the characteristic of stress corrosion cracking resistance of the pipe under the working condition environment, and effectively solves the problem of evaluating the stress corrosion cracking resistance of the pipe. Whole testing process safe and reliable, whole automatic intelligence is controlled, and convenient operation does benefit to the realization and rational in infrastructure.
Drawings
FIG. 1 is a schematic structural view of stress corrosion cracking susceptibility evaluation according to the present invention.
The device comprises a test pipe 1, a gas supply unit 2, a buffer unit 3, a post-processing unit 4, a monitoring assembly 5, a control unit 6, a seal head 7, a support 8, a third pipeline 9, a second pipeline 10, a first pipeline 11, a second control valve 12, a first control valve 13 and a valve 14.
Detailed Description
The invention is further described below with reference to the figures and examples.
Referring to fig. 1, the device for evaluating the stress corrosion cracking sensitivity of the pipe comprises a test pipe 1, an air supply unit 2, a monitoring assembly 5, a control unit 6, a first pipeline 11 and a second pipeline 10, wherein end sockets 7 are hermetically arranged at two ends of the test pipe 1, the first pipeline 11 penetrates through the end sockets 7 from one end of the test pipe 1 to be communicated with an inner cavity of the test pipe 1, one end of the second pipeline 10 penetrates through the end sockets 7 from the other end of the test pipe 1 to be communicated with the inner cavity of the test pipe 1, the other end of the second pipeline 10 is connected with the air supply unit 2, a first control valve 13 is arranged at the part of the first pipeline 11, which is positioned outside the test pipe 1, a second control valve 12 is arranged at the part of the second pipeline 10, which is positioned between the test pipe 1 and the air supply unit 2, the monitoring assembly 5 is used for measuring strain and is arranged at the maximum strain position of, The first control valve 13 and the second control valve 12 are both connected with the control unit 6, and the test pipe 1 is a section of bimetal composite pipe.
As a preferred embodiment of the invention, the ends of the test pipe 1 of the end socket 7 are in threaded connection, wherein the outer surface of the test pipe 1 is provided with an external thread, and the inner surface of the end socket 7 is provided with an internal thread matched with the external thread.
In a preferred embodiment of the present invention, the test tube 1 is covered with a sealed buffer unit 3, the buffer unit 3 is connected to a third pipeline 9, and a valve 14 is provided at a portion of the third pipeline 9 located outside the buffer unit 3.
As a preferred embodiment of the present invention, the sealing head 7 is disposed in the buffer unit 3 through the bracket 8, and the test tube 1 is suspended in the buffer unit 3 through the bracket 8.
As a preferred embodiment of the invention, the pipe stress corrosion cracking susceptibility evaluation device of the invention further comprises a post-treatment unit 4, the first pipeline 11 and the third pipeline 9 are both connected to the post-treatment unit 4, and the post-treatment unit 4 can treat the discharge fluid of the buffer unit 3 and the test pipe 1.
As a preferred embodiment of the present invention, the first control valve 13 and the second control valve 12 are high-pressure pneumatic valves.
As a preferred embodiment of the present invention, the monitoring member 5 employs a strain gauge.
The invention also provides a method for evaluating the sensitivity of stress corrosion cracking of the pipe, which is carried out by adopting the device for evaluating the sensitivity of stress corrosion cracking of the pipe, and comprises the following steps:
analysis of dependent variable: 1) measuring stress-strain curves of the bimetal composite pipe and the base pipe which are easy to obtain; 2) drawing a stress-strain curve of the corrosion-resistant alloy layer according to a formula 1 to obtain the yield strength R of the corrosion-resistant alloy layere corrosion resistant alloy layer(ii) a 3) According to yield strength Re corrosion resistant alloy layerCorresponding strain value xie corrosion resistant alloy layerSearching the same strain value xi by combining the stress-strain curve of the bimetal composite tubeComposite pipeCorresponding stress level σComposite pipe(ii) a 4) According to pipe stress level sigmaComposite pipeCalculating the initial air-adding amount of the test pipe 1 based on the strength design theory and the gas state equation;
in the formula: sigma is the stress level corresponding to the bimetal composite pipe, the base pipe and the corrosion-resistant alloy layer, and t is the thickness corresponding to the base pipe and the corrosion-resistant alloy layer;
loading a test environment: injecting a test solution into the test pipe 1, heating the test solution to a test temperature, and introducing necessary corrosive gas to provide an environment condition required by the test;
test stress loading: setting gas injection amount according to calculated gas filling amount of the test pipe 1, injecting gas into the test pipe 1 by using the gas supply unit 2, and adjusting actual gas injection amount according to the strain value of the test pipe 1 measured by the monitoring component 5 in the filling process to enable the strain value of the test pipe 1 to reach a required value xiComposite pipeThen, starting test timing;
and (3) test stress maintenance: the strain value of the test pipe 1 is monitored at any time in the test, the control unit 6 is used for controlling the first control valve 13 and the second control valve 12, and further the air inflow and the air discharge of the test pipe 1 are adjusted to maintain the test pipe 1 to reach the required strain level;
and (3) performing flaw detection on the pipe, performing full-pipe flaw detection on the test pipe 1 after the test, analyzing the crack generation condition of the pipe, and evaluating the stress corrosion cracking sensitivity of the pipe.
As a preferred embodiment of the invention, inert gas is injected into the test tube 1 during the test stress loading.
Examples
The stress corrosion cracking sensitivity evaluation device of the embodiment comprises a test pipe 1, an air supply unit 2, a buffer unit 3, a post-processing unit 4, a monitoring assembly 5 and a control unit 6. The test pipe 1 is a section of bimetal composite pipe, two ends of the test pipe are provided with seal heads 7, and the pipe is sealed by threaded connection. The integral structure that experimental tubular product 1 and head 7 are connected passes through support 8 to be installed inside buffer unit 3, and buffer unit 3 passes through third pipeline 9 and connects aftertreatment unit 4. One end of the test pipe 1 is communicated with the gas supply unit 2 through a second pipeline 10, and the other end of the test pipe is communicated with the post-processing unit 4 through a first pipeline 11. The monitoring assembly 5 penetrates through the buffer unit 3 and is arranged at the maximum strain position on the outer side of the test pipe 1, and the actual strain value of the test pipe is measured and then fed back to the control unit 6. The control unit 6 is also connected with a second control valve 12 and a first control valve 13 which are arranged on the second pipeline 10 and the first pipeline 11, and can realize the injection and discharge control of the gas in the test pipe. In addition, a valve 14 is further arranged on the third pipeline 9 and used for discharging test gas in the buffer unit after the test.
The monitoring assembly can measure a strain value of the pipe to display the stress loading degree, and the maximum strain position of the outer wall of the pipe is arranged in a test. The control unit can calculate the required primary gas content according to the required strain value, and can micro-control the air input of the gas metering pump. In the test, the strain value can be fed back according to the monitoring assembly, and the air input is regulated and controlled to enable the actual strain value of the test pipe to be infinitely close to the required strain value. The volume of the buffer unit is obviously larger than that of the test pipe, the test pipe can be placed in the test, the seal is good, and the pressure not lower than the test pressure value can be borne. Meanwhile, even if the test pipe is broken and the gas leaks in the test, the gas can be sealed to prevent further leakage. The post-processing unit can process the exhaust gas of the buffer unit and the test pipe, and the test safety is ensured. The control valve is a high-pressure pneumatic valve. The monitoring assembly is measured by a strain gauge. The first pipeline, the second pipeline and the third pipeline have pressure bearing and corrosion resisting capabilities, and corrosion resisting alloy materials are preferably selected. The pipe plug has the pressure-bearing and corrosion-resistant capabilities, and is suitable for selecting non-metallic materials which cannot react with a test solution or degrade in a test environment.
In addition, the required strain value and the air entrainment amount are calculated by the following method:
1) measuring stress-strain curves of the bimetal composite pipe and the base pipe which are easy to obtain; 2) drawing a stress-strain curve of the corrosion-resistant alloy layer according to a formula 1 to obtain the yield strength of the corrosion-resistant alloy layer; 3) according to the strain value corresponding to the yield strength, the stress level corresponding to the same strain value is searched by combining the stress-strain curve of the composite pipe; 4) and calculating the initial air-adding amount of the test pipe (1) according to the stress level of the pipe based on the strength design theory and the gas state equation.
In conclusion, the method and the device for evaluating the stress corrosion cracking sensitivity can utilize the performance parameters convenient to measure to deduce the mechanical property of the corrosion-resistant alloy layer, and solve the problem that the mechanical property of the corrosion-resistant alloy layer is difficult to obtain; the effective loading and the whole-process control of the constant strain of the pipe can be realized through the combined control of inert gas loading, a monitoring component, a control unit and the like, and the problems that a corrosion-resistant alloy layer sample is difficult to process and the strain is difficult to accurately load are solved; by using the test pipe section as a test container, the corrosive solution, the gas medium and the ambient temperature required by the test can be introduced, and simultaneously, by means of the buffer unit and the post-treatment unit, not only is the corrosive environment container required by the test provided, but also the safety during the test is ensured. Whole automatic intelligence of whole test process is controlled, convenient operation does benefit to and realizes and rational in infrastructure.
Claims (9)
1. A device for evaluating stress corrosion cracking sensitivity of a pipe is characterized by comprising a test pipe (1), an air supply unit (2), a monitoring assembly (5), a control unit (6), a first pipeline (11) and a second pipeline (10), wherein end sockets (7) are hermetically arranged at two ends of the test pipe (1), the first pipeline (11) penetrates through the end sockets (7) from one end of the test pipe (1) to be communicated with an inner cavity of the test pipe (1), one end of the second pipeline (10) penetrates through the end sockets (7) from the other end of the test pipe (1) to be communicated with the inner cavity of the test pipe (1), the other end of the second pipeline (10) is connected with the air supply unit (2), a first control valve (13) is arranged at the part of the first pipeline (11) positioned outside the test pipe (1), a second control valve (12) is arranged at the part of the second pipeline (10) between the test pipe (1) and the air supply unit (2), monitoring subassembly (5) are used for measuring to meet an emergency and set up in the maximum department of meeting an emergency of experimental tubular product (1) outer wall, and air feed unit (2), monitoring subassembly (5), first control valve (13) and second control valve (12) all are connected with control unit (6), experimental tubular product (1) is one section bimetal composite pipe.
2. The device for evaluating the stress corrosion cracking sensitivity of the pipe according to claim 1, wherein the end socket (7) is in threaded connection with the end of the test pipe (1), wherein the outer surface of the test pipe (1) is provided with an external thread, and the inner surface of the end socket (7) is provided with an internal thread matched with the external thread.
3. The device for evaluating the susceptibility to stress corrosion cracking of the pipe according to claim 1 or 2, wherein the test pipe (1) is covered with a sealed buffer unit (3), a third pipeline (9) is connected to the buffer unit (3), and a valve (14) is arranged on the portion, located outside the buffer unit (3), of the third pipeline (9).
4. The evaluation device for the susceptibility of the pipe to stress corrosion cracking according to claim 3, wherein the end socket (7) is arranged in the buffer unit (3) through a bracket (8), and the test pipe (1) is suspended in the buffer unit (3) through the bracket (8).
5. The pipe stress corrosion cracking susceptibility evaluation device of claim 3, further comprising an after-treatment unit (4), wherein the first pipeline (11) and the third pipeline (9) are both connected to the after-treatment unit (4), and the after-treatment unit (4) is capable of treating the buffer unit (3) and the discharge fluid of the test pipe (1).
6. The evaluation device for susceptibility to stress corrosion cracking of a pipe according to claim 1, wherein the first control valve (13) and the second control valve (12) are high-pressure pneumatic valves.
7. The evaluation device for the stress corrosion cracking sensitivity of the pipe according to claim 1, wherein the monitoring component (5) adopts a strain gauge.
8. A method for evaluating the stress corrosion cracking sensitivity of a pipe, which is characterized by being carried out by adopting the stress corrosion cracking sensitivity evaluation device of any one of claims 1 to 7, and comprising the following steps of:
analysis of dependent variable: 1) measuring stress-strain curves of the bimetal composite pipe and the base pipe which are easy to obtain; 2) drawing a stress-strain curve of the corrosion-resistant alloy layer according to a formula 1 to obtain the yield strength R of the corrosion-resistant alloy layere corrosion resistant alloy layer(ii) a 3) According to yield strength Re corrosion resistant alloy layerCorresponding strain value xie corrosion resistant alloy layerObtaining the same strain value xi by combining the stress-strain curve of the bimetal composite tubeComposite pipeCorresponding stress level σComposite pipe(ii) a 4) According to pipe stress level sigmaComposite pipeCalculating the initial air-adding amount of the test pipe (1) based on the strength design theory and the gas state equation;
in the formula: sigma is the stress level corresponding to the bimetal composite pipe, the base pipe and the corrosion-resistant alloy layer, and t is the thickness corresponding to the base pipe and the corrosion-resistant alloy layer;
loading a test environment: injecting a test solution into the test pipe (1), heating the test solution to a test temperature, and introducing necessary corrosive gas;
test stress loading: setting gas injection amount according to the calculated gas injection amount of the test pipe (1), injecting gas into the test pipe (1) by using the gas supply unit (2), and adjusting the actual gas injection amount according to the strain value of the test pipe (1) measured by the monitoring component (5) in the injection process to enable the strain value of the test pipe (1) to reach the required value xiComposite pipeThen, starting test timing;
and (3) test stress maintenance: monitoring the strain value of the test pipe (1) at any time in the test, and controlling a first control valve (13) and a second control valve (12) by using a control unit (6) so as to adjust the air inflow and the air discharge of the test pipe (1) to maintain the test pipe (1) to reach the required strain level;
flaw detection of the pipe: after the test, carrying out full-pipe flaw detection on the test pipe (1), analyzing the crack generation condition of the pipe, and giving an evaluation result of the stress corrosion cracking sensitivity of the pipe.
9. The method for evaluating the stress corrosion cracking susceptibility of a pipe according to claim 8, wherein an inert gas is injected into the test pipe (1) during the test stress loading.
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| CN113295513A (en) * | 2021-06-09 | 2021-08-24 | 北京科技大学 | Stress corrosion test system and test method for reinforced concrete drainage pipeline |
| CN113916761A (en) * | 2021-10-09 | 2022-01-11 | 北京中冶设备研究设计总院有限公司 | Automatic discharging device for corrosive liquid |
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