Electromagnetic interference from power lines on pipelines: influence of pipe insulating coating degradation

Abstract

Summary The paper is aimed to analyse the influence of the degradation, in the course of time, of pipelines insulating coating in the frame of power frequency electromagnetic interference generated by power lines on buried metallic pipelines. To our knowledge, such an issue is generally not considered when evaluating induced voltage and current along the pipe‐earth circuit; on the contrary, such a phenomenon should be taken into account because under certain conditions, the level of the electromagnetic interference can significantly vary during the pipeline life (some tens of years). In the paper, we propose an empirical law to describe the degradation in the course of time of the pipe insulation resistance to soil, and we show, by means of simple examples of interference calculation, why such a degradation should be taken into account. Copyright © 2016 John Wiley & Sons, Ltd.

Corrosion-mechanical behavior of gas main steel in saline soils

“…It can be noted that in case of damage to insulation and the absence or improper quality of active corrosion protection, thinning in chloride environments in the area of operational loads can reach 0.45-0.55 mm, and taking into account the localization process in case of ME3 it exceeds 6 mm/year, which testifies for the considerable danger of overpressure of pipelines, especially those that are used from 15 to 25 years with obsolete and degraded bituminous corrosion-resistant coatings [25][26][27][28]. It is particularly important to conduct groundwater analysis along pipelines' routes in order to timely assess the risks of corrosion degradation of steel pipelines and prevent depressurization, or more severe failures and emergency situations [29,30].…”

Location estimation of coating defects and mitigation of induced AC voltages along buried gas pipeline

“…The expected induced AC voltage and corresponding mitigation are presented for years 2020, 2025, and 2030 considering the pipeline coating degradation by the help of data reported in [30,31]. Fig.…”

Influence of Steel Non-Linearity in Assessing 50-60 Hz Interference on Pipelines

“…conductance. See [20] for more details. • Value of the earthing resistance R e : in fact, the pipeline can be earthed in discrete points along its route by means of earthing electrodes.…”