Version 2 2024-06-03, 20:17Version 2 2024-06-03, 20:17
Version 1 2019-06-27, 14:42Version 1 2019-06-27, 14:42
conference contribution
posted on 2024-06-03, 20:17authored byM Rabbani, Aman Maung Than Oo
Direct lightning strike in the vicinity of buried high-pressure energy pipeline can cause damages to pipe coatings or to the metal pipe. This damage sometimes leads to explosions which may cause loss of consignments. This is also a risk to pipeline integrity and safety of the people working on the pipeline. Hence, lightning induced electromagnetic interference (EMI) on buried energy pipeline is a matter of serious concern. To protect buried metallic energy pipeline from the effects of direct lightning strikes near the pipeline to the ground, it is necessary to have comprehensive information about the lightning currents and the radiated electromagnetic fields. To obtain thorough information of lightning-induced effect on the buried pipeline, a computational model considering electrical parameters of soil, pipe and lighting strikes to carry out a simulation of buried pipeline under soil has been developed which can be used to identify parameters influencing the coupling phenomenon between pipeline and lightning strike. The E and H field was estimated at various distance and depth from the point of strike. The model is based on the finite difference time domain (FDTD) solution of Maxwell's equations. Lightning current and other fields are calculated within soil with and without the presence pipe and the same has been done for pipe with and without corrosion coating. The results are then used to analyze the influence of various parameters of the studied system on the development of high breakdown potential around the pipeline. This paper then presents the impacts of the direct lightning strike to the ground on buried metallic energy pipeline with corrosion coating. The results showed that although ground conductivity, current rise time, burial depth of pipeline and the pipeline metallic property has an influence on the severity of impact, in case of coated pipe, the coating on pipeline plays a great role on the scale of impact lightning can cause on the pipeline. While coating prevents pipelines from corrosion, the very low conductive coating is also responsible for very high electric field above the pipe surface. This work will be very useful pipeline industry in selecting a coating with suitable impedance value so that buried pipeline can be protected from both corrosion and lightning strike.