CN109164138B - Method for predicting residual life of in-service gas polyethylene pipeline - Google Patents
Method for predicting residual life of in-service gas polyethylene pipeline Download PDFInfo
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Abstract
A method for predicting the residual life of an in-service gas polyethylene pipeline belongs to the technical field of polyethylene pipeline life detection. The method comprises the steps of firstly, carrying out an accelerated aging test on polyethylene pipes with the same brands as those of in-service gas polyethylene pipes, preparing the aged polyethylene pipes according to the method requirements, recording aging time, temperature and pressure, then testing the oxidation induction period of the aged polyethylene pipes by using a differential thermal scanning method, recording an oxidation induction period data set, and obtaining a residual life prediction formula:
finally, only a small amount of fine powder is scraped from the outer surface of the in-service polyethylene pipeline to be tested by a differential thermal scanning method, and the obtained oxidation induction period value is substituted into a in the residual life prediction formula0And (4) calculating to predict the residual service life of the gas polyethylene pipeline in the running state. The service life prediction method does not influence the normal operation of the town gas polyethylene pipeline, is simple and time-saving, has certain data false distinguishing capability, and can provide technical support for the safe operation of the in-service gas polyethylene pipeline.
Description
Technical Field
The invention belongs to the technical field of polyethylene pipeline service life detection, and particularly relates to a method for predicting the residual service life of an in-service gas polyethylene pipeline.
Background
Because the polyethylene pipeline has the characteristics of corrosion resistance, light weight, low friction resistance and the like, the polyethylene pipeline is widely applied to urban gas pipeline transportation. However, polyethylene belongs to a high polymer material and is easy to age, so that the polyethylene pipeline has the problem of aging failure. At present, the transportation of the in-service gas polyethylene pipeline needs to be operated under the action of certain pressure, the service life of the gas polyethylene pipeline under certain pressure is an important index in engineering application, and the national standard regulation specifies that the service life of the polyethylene gas pipeline is not less than 50 years under the temperature condition of 20 ℃. Currently, the ISO9080 standard (the inference method for determining the long-term flow hydrostatic strength of thermoplastic pipe type materials) established by the american plastic pipe association is adopted as a life prediction formula of polyethylene pipes, as shown in formula 1:
in the formula: t is tf-service life, h; t-hydrostatic test temperature, DEG C; A. b, C, D — regression model parameters related to specific material brand; sigmaθ-hoop stress at impact. The method is less combined with actual working conditions, the test time is long, the pipe needs to be cut from the in-service pipeline for testing, the normal operation of the gas pipeline can be seriously influenced, and potential safety hazards can also exist when the pipeline is secondarily fused.
The low-attribute aged polyethylene pipelines are used for decades, and the gas polyethylene pipelines are mostly distributed in densely populated areas, so that the polyethylene gas pipelines have many accidents of explosion and leakage at home and abroad, which causes serious economic loss and even harms personal safety. Therefore, in order to ensure the safe operation of the polyethylene gas pipeline system and not to influence the normal operation of the pipeline, it is necessary to use a convenient and safe method to research the actual service life of the in-service polyethylene pressure pipeline.
Disclosure of Invention
The invention provides a method for predicting the residual life of an in-service gas polyethylene pipeline, which predicts the failure life of the in-service gas polyethylene pipeline by carrying out a pressure-bearing accelerated aging test of the gas polyethylene pipeline and an oxidation induction period test of the in-service gas polyethylene pipeline.
The technical scheme for using the device in the prediction method of the residual life of the in-service gas polyethylene pipeline comprises the following steps:
the in-service gas polyethylene pipeline (2) is a regional pipeline to be tested in the in-service gas polyethylene pipeline (1), the polyethylene fine powder particles (3) come from the in-service gas polyethylene pipeline (2) of a selected testing region, the gas polyethylene pipeline (4) is a polyethylene pipeline with the same mark number as the in-service gas polyethylene pipeline (2), the pressure-bearing accelerated aging test box (5) is used for pressure-bearing accelerated aging gas polyethylene pipeline (4), the gas polyethylene pipeline (6) is an aged gas polyethylene pipeline obtained after the pressure-bearing accelerated aging gas polyethylene pipeline (4) is carried out by the accelerated aging test box (5), the polyethylene fine powder particles (7) are fine powder particles scraped from the aged gas polyethylene pipeline (6), the electronic balance (8) is used for weighing the polyethylene fine powder particles (3) and the polyethylene fine powder particles (7), the crucible (9) is used for aging the polyethylene fine powder particles (3) and the polyethylene fine powder particles (7), the differential thermal scanner (10) is used for testing the oxidation induction periods of the polyethylene fine powder particles (3) and the polyethylene fine powder particles (7), and the computer (11) is used for constructing a residual life prediction model of the polyethylene pipeline in service gas according to the test values of the oxidation induction periods of the polyethylene fine powder particles (3) and the polyethylene fine powder particles (7).
The invention provides a method for predicting the residual life of an in-service gas polyethylene pipeline, which comprises the following steps of:
a. selecting a key fuel gas polyethylene pipe section of an area to be tested from an in-service fuel gas polyethylene pipeline, scraping some fine powder particles on the outer surface of the fuel gas polyethylene pipeline, firstly putting the fine powder particles into an electronic balance to weigh (the weight is about 15mg), then putting the weighed polyethylene fine powder particles into a differential thermal scanner to perform oxidation induction period test, and recording a test value a0。
b. Selecting the gas polyethylene pipelines with the same brands as the in-service gas polyethylene buried pipelines, putting the gas polyethylene pipelines with the same brands as the in-service gas polyethylene buried pipelines into a pressure-bearing accelerated aging test device, carrying out pressure-bearing accelerated aging tests on the gas polyethylene pipelines with the same brands as the in-service gas polyethylene buried pipelines under the temperature conditions of 70 ℃, 80 ℃ and 90 ℃ and the pressure condition consistent with the actual working condition until the polyethylene pipelines are subjected to brittle failure, recording the three test temperatures and the elapsed times, and respectively recording the test temperatures and the elapsed times as T70、T80、T90And ta1、tb1，tc1Scraping the fine powder particles from the outer surface of the polyethylene pipeline, putting the fine powder particles into an electronic balance to weigh (about 15mg), putting the weighed polyethylene fine powder particles into a crucible, putting the crucible with the polyethylene fine powder particles into a differential thermal scanner to test the oxidation induction period, and recording the oxidation induction period as aa1、ab1、ac1。
c. Selecting a fuel gas polyethylene pipeline with the same grade as an in-service fuel gas polyethylene buried pipeline, putting the fuel gas polyethylene pipeline with the same grade as the in-service fuel gas polyethylene buried pipeline into a pressure-bearing accelerated aging test device, carrying out pressure-bearing accelerated aging tests on the fuel gas polyethylene pipeline with the same grade as the in-service fuel gas polyethylene buried pipeline under the temperature conditions of 70 ℃, 80 ℃ and 90 ℃ and the pressure condition consistent with the actual working condition, recording the test temperature and the elapsed time for three times, and respectively recording the test temperature and the elapsed time as T70、T80、T90And ta2、tb2，tc2Scraping the fine powder particles from the outer surface of the polyethylene pipeline, putting the fine powder particles into an electronic balance to weigh (about 15mg), putting the weighed polyethylene fine powder particles into a crucible, putting the crucible with the polyethylene fine powder particles into a differential thermal scanner to test the oxidation induction period, and recording the oxidation induction period as aa2、ab2、ac2。
d. Obtaining the following formula (2) according to the proportional relation of the performance change indexes of the same polyethylene pipe:
wherein:
t is the actual service life of the in-service gas polyethylene buried pipeline;
t is the actual working condition temperature of the in-service gas polyethylene buried pipeline;
A、A1、A2、A3is an empirical constant;
a is a test value of the oxidation induction period of the gas polyethylene pipeline in any aging time;
a0is a test value of an in-service gas polyethylene pipeline oxidation induction period;
Pgasis the pressure of the in-service gas polyethylene pipeline in normal work;
Pfthe pressure is calibrated, namely the local atmospheric pressure when the in-service gas polyethylene pipeline works normally;
b is the ratio of activation energy to gas constant;
c- -correlation coefficient of normal pressure, calibration pressure and temperature;
d- - -correlation coefficient of normal pressure and calibrated pressure.
e. And d, obtaining a predicted service life t calculation formula (3) of the in-service gas polyethylene buried pipeline under the actual working condition through the conversion of the step d:
the invention has the beneficial effects that:
the method for predicting the residual life of the in-service polyethylene pipeline can predict the service life of the in-service polyethylene pipeline under the normal operation condition of the town gas polyethylene pipeline, has the advantages of simple operation steps, convenient and quick sampling, low requirement on the skill level of a sampler, less quantity of samples to be tested, short testing time and reliable testing result, and can quickly obtain a life prediction analysis result; the prediction method for the residual service life of the in-service gas polyethylene pipeline has a certain false data identification function, can provide support for safe operation of the gas polyethylene pipeline, and can be used as one of the judgment standards of the quality grade of a production factory.
Drawings
FIG. 1 is a flow chart of the present invention.
Figure 2 is a flow chart of the operation of the device of the present invention in use,
wherein:
1-in-service gas polyethylene pipeline, 2-in-service gas polyethylene pipeline, 3-polyethylene fine powder particles, 4-gas polyethylene pipeline, 5-pressure-bearing accelerated aging test box, 6-aging gas polyethylene pipeline, 7-polyethylene fine powder particles, 8-electronic balance, 9-crucible, 10-differential thermal scanner and 11-computer.
Detailed Description
The invention provides a method for predicting the residual life of an in-service gas polyethylene pipeline, which is further explained by combining the attached drawings and the detailed implementation mode.
The invention provides a method for predicting the residual life of an in-service gas polyethylene pipeline, which is shown in figure 1, and the device related to the method consists of an in-service gas polyethylene pipeline (1), an in-service gas polyethylene pipeline (2), polyethylene fine powder particles (3), a gas polyethylene pipeline (4), a pressure-bearing accelerated aging test box (5), an aged gas polyethylene pipeline (6), polyethylene fine powder particles (7), an electronic balance (8), a crucible (9), a differential thermal scanner (10) and a computer (11), wherein the in-service gas polyethylene pipeline (2) is a key area pipeline section to be tested in the in-service gas polyethylene pipeline (1), the polyethylene fine powder particles (3) come from the in-service gas polyethylene pipeline (2) in a selected test area, the gas polyethylene pipeline (4) is a polyethylene pipeline with the same brand number as the in-service gas polyethylene pipeline (2), the pressure-bearing accelerated aging test box (5) is used for a pressure-bearing accelerated aging gas polyethylene pipeline (4), the gas polyethylene pipeline (6) is an aged gas polyethylene pipeline obtained after the pressure-bearing accelerated aging gas polyethylene pipeline (4) passes through the accelerated aging test box (5), polyethylene fine powder particles (7) are fine powder particles scraped from the outer surface of the aged gas polyethylene pipeline (6), an electronic balance (8) is used for weighing the polyethylene fine powder particles (3) and the polyethylene fine powder particles (7), a crucible (9) is used for storing the polyethylene fine powder particles (3) and the polyethylene fine powder particles (7), a differential thermal scanner (10) is used for testing the oxidation induction period of the polyethylene fine powder particles (3) and the polyethylene fine powder particles (7), and according to the test value of the oxidation induction period of the polyethylene fine powder particles (3) and the polyethylene fine powder particles (7), the computer (11) is used for constructing a prediction model of the residual life of the in-service gas polyethylene pipeline (figure 2).
The method for predicting the residual life of the in-service gas polyethylene pipeline comprises the following steps:
a. selecting a key fuel gas polyethylene pipe section of an area to be tested from an in-service fuel gas polyethylene pipeline, scraping off some fine powder particles on the outer surface of the fuel gas polyethylene pipeline, weighing the fine powder particles in an electronic balance (the weight is about 15mg), placing the weighed polyethylene fine powder particles into a differential thermal scanner for oxidation induction period test, and recording a test value a0；
b. Selecting the gas polyethylene pipelines with the same brands as the in-service gas polyethylene buried pipelines, putting the gas polyethylene pipelines with the same brands as the in-service gas polyethylene buried pipelines into a pressure-bearing accelerated aging test device, carrying out pressure-bearing accelerated aging tests on the gas polyethylene pipelines with the same brands as the in-service gas polyethylene buried pipelines under the temperature conditions of 70 ℃, 80 ℃ and 90 ℃ and the pressure condition consistent with the actual working condition until the polyethylene pipelines are subjected to brittle failure, recording the three test temperatures and the elapsed times, and respectively recording the test temperatures and the elapsed times as T70、T80、T90And ta1、tb1，tc1Scraping the fine powder particles from the outer surface of the polyethylene pipeline, putting the fine powder particles into an electronic balance to weigh (about 15mg), putting the weighed polyethylene fine powder particles into a crucible, putting the crucible with the polyethylene fine powder particles into a differential thermal scanner to test the oxidation induction period, and recording the oxidation induction period as aa1、ab1、ac1；
c. Selecting the gas polyethylene pipelines with the same brands as the in-service gas polyethylene buried pipelinesPutting the gas polyethylene pipelines with the same brands of the service gas polyethylene buried pipelines into a pressure-bearing accelerated aging test device, carrying out pressure-bearing accelerated aging tests on the gas polyethylene pipelines with the same brands of the service gas polyethylene buried pipelines under the temperature conditions of 70 ℃, 80 ℃ and 90 ℃ and the pressure condition consistent with the actual working condition, recording the test temperature and the elapsed time of three times, and respectively recording the test temperature and the elapsed time as T70、T80、T90And ta2、tb2，tc2Scraping the fine powder particles from the outer surface of the polyethylene pipeline, putting the fine powder particles into an electronic balance to weigh (about 15mg), putting the weighed polyethylene fine powder particles into a crucible, putting the crucible with the polyethylene fine powder particles into a differential thermal scanner to test the oxidation induction period, and recording the oxidation induction period as aa2、ab2、ac2；
d. According to the proportional relation of the performance change indexes of the same polyethylene pipe, the following formula is obtained:
wherein:
t is the actual service life of the in-service gas polyethylene buried pipeline;
t is the actual working condition temperature of the in-service gas polyethylene buried pipeline;
A、A1、A2、A3is an empirical constant;
a is a test value of the oxidation induction period of the gas polyethylene pipeline in any aging time;
a0is a test value of an in-service gas polyethylene pipeline oxidation induction period;
Pgasis the pressure of the in-service gas polyethylene pipeline in normal work;
Pfthe pressure is calibrated, namely the local atmospheric pressure when the in-service gas polyethylene pipeline works normally;
b is the ratio of activation energy to gas constant;
c- -correlation coefficient of normal pressure, calibration pressure and temperature;
d- - -correlation coefficient of normal pressure and calibrated pressure.
e. And d, obtaining the predicted service life t of the in-service gas polyethylene buried pipeline under the actual working condition through the conversion of the step d:
the above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the embodiments of the present invention are included in the scope of the present invention.
Claims (1)
1. A method for predicting the residual life of an in-service gas polyethylene pipeline is characterized in that a device related to the method consists of an in-service gas polyethylene pipeline (1), an in-service gas polyethylene pipeline (2), polyethylene fine powder particles (3), a gas polyethylene pipeline (4), a pressure-bearing accelerated aging test box (5), an aging gas polyethylene pipeline (6), polyethylene fine powder particles (7), an electronic balance (8), a crucible (9), a differential thermal scanner (10) and a computer (11), wherein the in-service gas polyethylene pipeline (2) is a key pipeline section to be tested in the in-service gas polyethylene pipeline (1), the polyethylene fine powder particles (3) come from the in-service gas polyethylene key pipeline section (2) in a selected test area, the gas polyethylene pipeline (4) is a polyethylene pipeline with the same brand as the in-service gas polyethylene pipeline (2), the pressure-bearing accelerated aging test box (5) is used for a pressure-bearing accelerated aging gas polyethylene pipeline (4), the gas polyethylene pipeline (6) is an aged gas polyethylene pipeline obtained after the pressure-bearing accelerated aging gas polyethylene pipeline (4) is subjected to the pressure-bearing accelerated aging gas polyethylene pipeline (5), polyethylene fine powder particles (7) are fine powder particles directly scraped from the outer surface of the aged gas polyethylene pipeline (6), an electronic balance (8) is used for weighing the polyethylene fine powder particles (3) and the polyethylene fine powder particles (7), a crucible (9) is used for placing the polyethylene fine powder particles (3) and the polyethylene fine powder particles (7), a differential thermal scanner (10) is used for testing the oxidation induction period of the polyethylene fine powder particles (3) and the polyethylene fine powder particles (7), and according to the test value of the oxidation induction period of the polyethylene fine powder particles (3) and the polyethylene fine powder particles (7), the computer (11) is used for constructing a prediction model of the residual life of the in-service gas polyethylene pipeline; the method comprises the following steps:
a. selecting a gas polyethylene pipeline in an area to be tested from an in-service gas polyethylene pipeline, scraping polyethylene fine powder particles on the outer surface of the gas polyethylene pipeline, weighing the weight of the fine powder particles by using an electronic balance, placing the weighed polyethylene fine powder particles into a differential thermal scanner for oxidation induction period test, and recording a test value a0；
b. Selecting the gas polyethylene pipelines with the same brands as the in-service gas polyethylene buried pipelines, putting the gas polyethylene pipelines with the same brands as the in-service gas polyethylene buried pipelines into a pressure-bearing accelerated aging test device, and bearing the gas polyethylene pipelines with the same brands as the in-service gas polyethylene buried pipelines under the temperature conditions of 70 ℃, 80 ℃ and 90 ℃ and the pressure conditions consistent with the actual working conditionsPressing and accelerating aging test until the polyethylene pipeline is subjected to brittle failure, recording the temperature and the elapsed time of the three tests, and respectively recording the temperature and the elapsed time as T70、T80、T90And ta1、tb1，tc1(ii) a Scraping some fine powder particles from the outer surface of the polyethylene pipeline, putting the fine powder particles into an electronic balance for weighing, putting the polyethylene fine powder particles after weighing into a crucible, putting the crucible with the polyethylene fine powder particles into a differential thermal scanner for testing the oxidation induction period, and recording the oxidation induction period as aa1、ab1、ac1；
c. Selecting a fuel gas polyethylene pipeline with the same grade as an in-service fuel gas polyethylene buried pipeline, putting the fuel gas polyethylene pipeline with the same grade as the in-service fuel gas polyethylene buried pipeline into a pressure-bearing accelerated aging test device, carrying out pressure-bearing accelerated aging tests on the fuel gas polyethylene pipeline with the same grade as the in-service fuel gas polyethylene buried pipeline under the temperature conditions of 70 ℃, 80 ℃ and 90 ℃ and the pressure condition consistent with the actual working condition, recording the test temperature and the elapsed time for three times, and respectively recording the test temperature and the elapsed time as T70、T80、T90And ta2、tb2，tc2(ii) a Scraping some fine powder particles from the outer surface of the polyethylene pipeline, putting the fine powder particles into an electronic balance for weighing, putting the polyethylene fine powder particles after weighing into a crucible, putting the crucible with the polyethylene fine powder particles into a differential thermal scanner for testing the oxidation induction period, and recording the oxidation induction period as aa2、ab2、ac2；
d. According to the proportional relation of the performance change indexes of the same polyethylene pipe, the following formula is obtained:
wherein:
t is the actual service life of the in-service gas polyethylene buried pipeline;
t is the actual working condition temperature of the in-service gas polyethylene buried pipeline;
A、A1、A2、A3is an empirical constant;
a is a test value of the oxidation induction period of the gas polyethylene pipeline in any aging time;
a0is a test value of an in-service gas polyethylene pipeline oxidation induction period;
Pgasis the pressure of the in-service gas polyethylene pipeline in normal work;
Pfthe pressure is calibrated, namely the local atmospheric pressure when the in-service gas polyethylene pipeline works normally;
b is the ratio of activation energy to gas constant;
c- -correlation coefficient of normal pressure, calibration pressure and temperature;
d- - -correlation coefficient of normal pressure and calibration pressure;
e. and d, obtaining a calculation formula of the predicted service life t of the in-service buried polyethylene pipeline under the actual working condition through the conversion in the step d:
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| CN110333265B (en) * | 2019-07-11 | 2020-11-06 | 中国中车股份有限公司 | Method and system for predicting residual life of exhaust corrugated pipe of locomotive engine |
| CN114184488B (en) * | 2021-12-01 | 2024-01-30 | 中海石油(中国)有限公司 | Quick testing method for service life of optical cable of oil well |
| CN115289404B (en) * | 2022-07-25 | 2024-11-08 | 中国石油化工股份有限公司 | Service life prediction method, storage medium and equipment for pipeline heat preservation material |
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| CN104266961A (en) * | 2014-10-16 | 2015-01-07 | 北京交通大学 | Thermal oxidation accelerated aging test device and service life prediction method for in-service polyethylene pipeline |
| CN104793111A (en) * | 2015-03-31 | 2015-07-22 | 华南理工大学 | Insulating cable residual service life comprehensive evaluation method based on physical, chemical and electric properties |
| CN105158085A (en) * | 2015-10-26 | 2015-12-16 | 洛阳轴研科技股份有限公司 | Compound polyimide retainer storage life prediction method |
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