Research on reliability of corroded pipelines based on step-down-stress accelerated life testing

doi:10.16265/j.cnki.issn1003-3033.2017.01.011

Abstract

Abstract: In order to ensure the safe operation of oil and gas pipelines, the reliability of corrosion pipelines' life was studied. Firstly, based on the failure mechanism of the pipelines, corrosion rate sample data in different temperature environments were obtained by using the step-down-stress accelerated life testing method. Secondly, a data conversion model was built by using the acceleration factor and inverse power law equation. The corrosion rate data were converted into failure time data and truncated as the input of the model. Then quasi-samples with unknown parameters were obtained. Thirdly, three parameters of Weibull distribution were estimated by means of those samples, and the reliability function of pipelines was obtained with temperature and time as the independent variables. Finally, pipelines , which were made of N80 steel and operated in H₂S/CO₂ system were taken as examples to prove the reliability of the method. The results show that by using the method ,the test time can be shorten greatly, and the pipelines’ life can be predicted accurately.

Key words: reliability analysis, step-down-stress accelerated life testing (SDS-ALT), acceleration factor, inverse power law equation, Weibull distribution

CLC Number:

X937

LUO Zhengshan, BI Aorui. Research on reliability of corroded pipelines based on step-down-stress accelerated life testing[J]. China Safety Science Journal, 2017, 27(1): 59-64.

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