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 PDF

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CN109164138B
CN109164138B CN201811331800.6A CN201811331800A CN109164138B CN 109164138 B CN109164138 B CN 109164138B CN 201811331800 A CN201811331800 A CN 201811331800A CN 109164138 B CN109164138 B CN 109164138B
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兰惠清
王洋
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Beijing Jiaotong University
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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:
Figure DDA0001860216070000011
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

Method for predicting residual life of in-service gas polyethylene pipeline
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:
Figure BDA0001860216050000011
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:
Figure BDA0001860216050000031
wherein:
Figure BDA0001860216050000032
Figure BDA0001860216050000041
Figure BDA0001860216050000042
Figure BDA0001860216050000043
Figure BDA0001860216050000044
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:
Figure BDA0001860216050000051
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:
Figure BDA0001860216050000071
wherein:
Figure BDA0001860216050000072
Figure BDA0001860216050000073
Figure BDA0001860216050000081
Figure BDA0001860216050000082
Figure BDA0001860216050000083
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:
Figure BDA0001860216050000091
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)

1.一种在役燃气聚乙烯管道剩余寿命预测方法，其特征在于该方法所涉及的器件是由在役燃气聚乙烯管线(1)、在役燃气聚乙烯管道(2)、聚乙烯细末颗粒(3)、燃气聚乙烯管道(4)、承压加速老化试验箱(5)、老化燃气聚乙烯管道(6)、聚乙烯细末颗粒(7)、电子天平(8)、坩埚(9)、差示热量扫描仪(10)、计算机(11)组成，在役燃气聚乙烯管道(2)为在役燃气聚乙烯管线(1)中要测试的重点管段，聚乙烯细末颗粒(3)来自于选取的测试区域的在役燃气聚乙烯重点管段(2)，燃气聚乙烯管道(4)是与在役燃气聚乙烯管道(2)同牌号的聚乙烯管道，承压加速老化试验箱(5)是用于承压加速老化燃气聚乙烯管道(4)，燃气聚乙烯管道(6)是经加速老化试验箱(5)进行承压加速老化燃气聚乙烯管道(4)后所得的老化燃气聚乙烯管道，聚乙烯细末颗粒(7)是从老化后燃气聚乙烯管道(6)外表面直接刮取下的细末颗粒，电子天平(8)用于称量聚乙烯细末颗粒(3)和聚乙烯细末颗粒(7)，坩埚(9)用于陈放聚乙烯细末颗粒(3)和聚乙烯细末颗粒(7)，差示热量扫描仪(10)用于测试聚乙烯细末颗粒(3)和聚乙烯细末颗粒(7)的氧化诱导期，依据聚乙烯细末颗粒(3)和聚乙烯细末颗粒(7)的氧化诱导期的测试值，计算机(11)用于构建在役燃气聚乙烯管道剩余寿命预测模型；按以下步骤进行：1. A method for predicting the remaining life of an in-service gas-fired polyethylene pipeline, characterized in that the devices involved in the method are composed of in-service gas-fired polyethylene pipelines (1), in-service gas-fired polyethylene pipelines (2), polyethylene fines Granules (3), gas-fired polyethylene pipes (4), pressure accelerated aging test chamber (5), aging gas-fired polyethylene pipes (6), polyethylene fine particles (7), electronic balances (8), crucibles (9) ), a differential calorimeter (10), and a computer (11), the in-service gas-fired polyethylene pipeline (2) is the key pipe section to be tested in the in-service gas-fired polyethylene pipeline (1), and the polyethylene fine particles (3 ) from the in-service gas-fired polyethylene key pipe section (2) in the selected test area, the gas-fired polyethylene pipe (4) is a polyethylene pipe of the same grade as the in-service gas-fired polyethylene pipe (2), and the pressure-bearing accelerated aging test chamber (5) is used for accelerated aging under pressure gas polyethylene pipeline (4). Gas polyethylene pipe, polyethylene fine particles (7) are the fine particles directly scraped from the outer surface of the aged gas polyethylene pipe (6), and the electronic balance (8) is used to weigh the polyethylene fine particles ( 3) and polyethylene fine particles (7), the crucible (9) is used to store the polyethylene fine particles (3) and polyethylene fine particles (7), and the differential calorimeter scanner (10) is used for testing polyethylene Oxidation induction period of fine particles (3) and polyethylene fine particles (7), based on the measured value of the oxidation induction period of polyethylene fine particles (3) and polyethylene fine particles (7), computer (11) Used to build a remaining life prediction model for in-service gas-fired polyethylene pipelines; proceed as follows: a、从在役燃气聚乙烯管线中选取所要测试区域的燃气聚乙烯管道，在该燃气聚乙烯管道外表面刮取一些聚乙烯细末颗粒，用电子天平称量细末颗粒的重量，将称量后的聚乙烯细末颗粒放入差示热量扫描仪中进行氧化诱导期测试，记录测试值a0；a. Select the gas-fired polyethylene pipeline in the area to be tested from the in-service gas-fired polyethylene pipeline, scrape some polyethylene fine particles on the outer surface of the gas-fired polyethylene pipeline, and weigh the fine particles with an electronic balance. The measured polyethylene fine powder particles are put into the differential calorimeter scanner to carry out the oxidation induction period test, and the test value a 0 is recorded; b、选取在役燃气聚乙烯埋地管道同牌号的燃气聚乙烯管道，将在役燃气聚乙烯埋地管道同牌号的燃气聚乙烯管道放入承压加速老化试验装置中，在70℃、80℃和90℃的温度条件以及与实际工况一致的压力条件下，对在役燃气聚乙烯埋地管道同牌号的燃气聚乙烯管道进行承压加速老化试验，直至聚乙烯管道发生脆性破坏，记录下三次试验温度、所经时间，分别记为T70、T80、T90和ta1、tb1，tc1；之后从聚乙烯管道外表面刮取一些细末颗粒，放入电子天平中称量重量，将称量完重量的聚乙烯细末颗粒放入坩埚中，将放有聚乙烯细末颗粒的坩埚置于差示热量扫描仪中测试氧化诱导期，测试所得氧化诱导期记录为aa1、ab1、ac1；b. Select the gas-fired polyethylene pipeline of the same brand as the in-service gas-fired polyethylene buried pipeline, and put the gas-fired polyethylene pipeline of the same brand of the in-service gas-fired polyethylene buried pipeline into the pressure-bearing accelerated aging test device. Under the temperature conditions of ℃ and 90℃ and the pressure conditions consistent with the actual working conditions, the pressure-bearing accelerated aging test is carried out on the gas-fired polyethylene pipeline of the same grade of the in-service gas-fired polyethylene buried pipeline until the polyethylene pipeline is brittle failure, and the record is recorded. The temperature and elapsed time of the next three tests are respectively recorded as T 70 , T 80 , T 90 and t a1 , t b1 , t c1 ; then scrape some fine particles from the outer surface of the polyethylene pipe and put them into an electronic balance to weigh Measure the weight, put the weighed polyethylene fine particles into the crucible, place the crucible with the polyethylene fine particles in the differential calorimeter to test the oxidation induction period, and record the oxidation induction period obtained from the test as a a1 , a b1 , a c1 ; c、选取在役燃气聚乙烯埋地管道同牌号的燃气聚乙烯管道，将在役燃气聚乙烯埋地管道同牌号的燃气聚乙烯管道放入承压加速老化试验装置中，在70℃、80℃和90℃的温度条件以及与实际工况一致的压力条件下，对在役燃气聚乙烯埋地管道同牌号的燃气聚乙烯管道进行承压加速老化试验，实验时长为聚乙烯老化开始至发生脆性破坏之间的任意时间点，记录下三次试验温度、所经时间，分别记为T70、T80、T90和ta2、tb2，tc2；之后从该聚乙烯管道外表面刮取一些细末颗粒，放入电子天平中称量重量，将称量完重量的聚乙烯细末颗粒放入坩埚中，将放有聚乙烯细末颗粒的坩埚置于差示热量扫描仪中测试氧化诱导期，测试所得氧化诱导期记录为aa2、ab2、ac2；c. Select the gas-fired polyethylene pipeline of the same brand as the in-service gas-fired polyethylene buried pipeline, and put the gas-fired polyethylene pipeline of the same brand of the in-service gas-fired polyethylene buried pipeline into the pressure-bearing accelerated aging test device. Under the temperature conditions of ℃ and 90℃ and the pressure conditions consistent with the actual working conditions, the accelerated aging test under pressure is carried out on the gas-fired polyethylene pipelines of the same grade of the in-service gas-fired polyethylene buried pipelines. The test duration is from the start of polyethylene aging to the occurrence of At any time point between the brittle failure, record the three test temperatures and the elapsed time, which are respectively recorded as T 70 , T 80 , T 90 and t a2 , t b2 , t c2 ; then scrape from the outer surface of the polyethylene pipe Put some fine particles into the electronic balance to weigh the weight, put the weighed polyethylene fine particles into the crucible, and place the crucible with the polyethylene fine particles in the differential calorimeter to test the oxidation. Induction period, the oxidation induction period obtained from the test is recorded as a a2 , a b2 , and a c2 ; d、根据同一种聚乙烯管材的性能变化指标的比例关系，得到下式：d. According to the proportional relationship of the performance change index of the same polyethylene pipe, the following formula is obtained:
Figure FDA0002780528880000021
Figure FDA0002780528880000021
 其中：in:
Figure FDA0002780528880000022
Figure FDA0002780528880000022
Figure FDA0002780528880000023
Figure FDA0002780528880000023
Figure FDA0002780528880000031
Figure FDA0002780528880000031
Figure FDA0002780528880000032
Figure FDA0002780528880000032
Figure FDA0002780528880000033
Figure FDA0002780528880000033
 t是在役燃气聚乙烯埋地管道在实际寿命；t is the actual life of the in-service gas-fired polyethylene buried pipeline; T是在役燃气聚乙烯埋地管道的实际工况温度；T is the actual working temperature of the in-service gas-fired polyethylene buried pipeline; A、A1、A2、A3是经验常数；A, A 1 , A 2 , A 3 are empirical constants; a是任意老化时间燃气聚乙烯管道氧化诱导期测试值；a is the test value of the oxidation induction period of the gas polyethylene pipeline at any aging time; a0是在役燃气聚乙烯管道氧化诱导期测试值；a 0 is the test value during the oxidation induction period of the in-service gas-fired polyethylene pipeline; Pgas是在役燃气聚乙烯管道正常工作时的压力；P gas is the pressure of the in-service gas polyethylene pipeline when it is working normally; Pf是标定压力，即在役燃气聚乙烯管道正常工作时当地的大气压力；P f is the calibration pressure, that is, the local atmospheric pressure when the in-service gas-fired polyethylene pipeline is working normally; B是活化能与气体常数的比值；B is the ratio of activation energy to gas constant; C----常压、标定压力与温度的相关系数；C——Correlation coefficient of atmospheric pressure, calibration pressure and temperature; D----常压与标定压力的相关系数；D----correlation coefficient between normal pressure and calibration pressure; e、通过步骤d的换算，得到在役燃气聚乙烯埋地管道在实际工况下的预测寿命t计算公式：e. Through the conversion of step d, the calculation formula of the predicted life t of the in-service gas-fired polyethylene buried pipeline under actual working conditions is obtained:
Figure FDA0002780528880000041
Figure FDA0002780528880000041
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