Abstract：

　　During the actual operation of the pipelines, there are many uncertain factors affecting pipeline safety. If these uncertain factors are not well considered, the results of reliability analysis will have greater deviations. In this paper, we made a statistical analysis of material properties of L415, L485 and L555 pipeline girth welds, including girth weld tensile strength, girth weld impact energy and girth weld fracture toughness. Normal distribution, logarithmic normal distribution, exponential distribution, Gumbel distribution and two-parameter Weibull distribution were used to describe the distribution of these parameters and to estimate parameter distributions. Then K-S and χ^a tests were used for a non-parametric test under the given significant level. Finally, according to test results, the best distributions of parameters were proposed, which is important to improve the accuracy of reliability analysis for girth welds on pipelines.

Key words： girth weld reliability parameter estimation non-parametric test

Received： 15 November 2016

Corresponding Authors：sjclass@126.com

Cite this article：REN Wei,SHUAI Jian. Research into the statistical distribution of reliability parameters for girth welds on pipelines[J]. 石油科学通报, 2016, 1(3): 484-492.

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