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AC and Transient Risk Assessment for Buried Pipelines

This paper provides a thorough analysis to elucidate the cause of the two reported gas leakage incidents that happened on the high pressure Gas Transmission System of Greece. The conditions and scenarios investigated in the paper are limited to the impact of a direct lightning strike to some adjacent tree/bush or a direct lightning strike over or near the respective pipeline branch to the earth. The paper will particularly discuss the conditions that have caused the reported incidents and the mitigation measures adopted following a dedicated risk assessment tool that has been developed. The risk assessment tool provides the probability to have a severe coating defect on buried gas pipelines under episodes related to direct lightning strikes in the adjacent soil. Severe coating defect on the pipeline does not necessarily mean metal wall fusion and gas leakage as a consequence. However a severe defect may result in the pipeline’s coating be left weakened/damaged and thus susceptible to further deterioration (i.e. wall fusion) in the event of future lightning strikes (either on the power lines or directly onto the ground).

Product Number: 51319-13551-SG
Author: Nikolaos Kokkinos
Publication Date: 2019
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