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Investigating Pipeline Integrity Failure as a Result of Corrosion
Abstract
The study reviewed different failure factors and data of onshore crude oil pipelines covering corrosion, external interference, structural defects, and operators’ errors. The focus of this research is to identify factors affecting failure of crude oil pipelines in Nigeria due to corrosion with analysis of failure data from 2008–2017. Corrosion (internal and external) over total length of available pipelines for each year was analysed to determine the current mean time associated with failure (MTBF) and Rocof of the pipelines that are currently existing. Constrain factors were revealed in the cause of the research, collected data were subjected into mathematical modelling to investigate for possible eradication or reduction of the discovered failures depending on the inevitability of such constrain unit. This was achieved using Homogenous Poisson process (HPP) and the Power Law Process (NHPP) in order to ascertain the best fit for the pipeline data obtained. The rate of failures estimated was discovered to be 0.330 per 100km with 1.57years estimated as Mean Time between Failure (MTBF). The analysis then assumed that the operating conditions as well as the pipeline diameters are in conformity. Based on this model, pipeline operators can adequately plan their maintenance schedules and associated capital and operating expenditures. Models for estimating pipeline failures and propelling for better maintenance decisions is then found pivotal for future safety of pipelines through applied methods for reasonable decrease in the rate of occurrence of failure and the cost effective operation of the pipeline network which is recommended to be another research focus.
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