Assessment of cathodic protection effect on long‐distance gas transportation pipelines based on buried steel specimens

He, Guoxi; Han, Ping; Liao, Kexi; Wang, Minan; Zhao, Shuai; Leng, Jihui

doi:10.1002/maco.202012020

Cited by 8 publications

(5 citation statements)

References 31 publications

(32 reference statements)

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“…Te remaining life of the pipeline can be divided into three aspects, namely, corrosion life, subcritical crack propagation life, and damage life. Among them, in addition to the subcritical crack propagation life (especially fatigue crack propagation life) is easier to predict, the study of corrosion life and damage life is far from mature, and foreign countries have not formed standards in this regard [12][13][14][15]. Te research idea is to obtain the statistical results of corrosion rate through the statistical analysis of the onsite corrosion number of a large number of pipelines, or to obtain the calculation of corrosion rate through a large number of corrosion data inside and outside the pipe, and to generalize to general pipelines.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Chemical Corrosion Rate and Remaining Life of Buried Oil and Gas Pipelines in Changqing Gas Field

Li¹,

Li²,

Ma³

et al. 2023

Journal of Chemistry

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Green synthesis and metal oxide composites have attracted much attention from researchers of industry and academia. As a typical application of green synthesis and metal oxide composites, the continuous change of industrial technology and the continuous improvement of the social and economic level, the demand for oil and gas are also increasing. However, the spatial gap between the place of origin and the place of demand for oil and gas resources is large, so the long-distance oil and gas pipeline came into being. However, under the action of time, coupled with the corrosion effect of the soil due to deep burial, some pipelines have serious aging and corrosion phenomena. Therefore, in order to give corresponding guarantees for economic development, we need to conduct in-depth research and analysis of the corrosion of oil and gas long-distance pipelines and give effective solutions. In this paper, the corrosion rate prediction of buried oil and gas pipelines is studied in Changqing gas field. By improving the inertial weights and learning factors of the traditional particle swarm algorithm, the parameters of the generalized regression neural network are optimized and selected, and the corrosion rate prediction model of buried pipelines is finally constructed. Comparative analysis with other swarm intelligence algorithms shows that the improved particle swarm algorithm has stronger convergence ability and higher prediction accuracy than the BP model and SVM model. In addition, based on the detection data collected at the site of the gathering and transportation pipeline in Changqing gas field, this paper uses the extreme value distribution theory and the local corrosion progress formula to establish a prediction model for the residual life of corrosion of buried pipelines. The model established in this paper can effectively determine the risk pipe segment of buried pipeline and provide a decision-making basis for pipeline management departments. The work provides an important application guidance to green synthesis and metal oxide composites.

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Section: Introductionmentioning

confidence: 99%

Prediction of Chemical Corrosion Rate and Remaining Life of Buried Oil and Gas Pipelines in Changqing Gas Field

Li¹,

Li²,

Ma³

et al. 2023

Journal of Chemistry

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“…Protective coatings and cathodic protection have been the most efficient method for the protection of buried pipelines. [ 1 ] In these systems, the primary role of the coating is to control corrosion processes by creating a barrier between the metal surface and the electrolyte. Since perfect insulation cannot be guaranteed, cathodic protection is frequently employed to preserve uncoated regions, in case of coating failures, by injecting cathodic current.…”

Section: Introductionmentioning

confidence: 99%

Long‐term cathodic disbondment tests in three‐layer polyethylene coatings

Freitas

Brasil

Leoni

et al. 2023

Materials & Corrosion

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Cathodic protection allied to a polymeric coating is one of the most employed techniques to protect buried steel pipelines against corrosion. Nevertheless, cathodic disbondment, a phenomenon associated with such protection in highperformance coatings such as (three-layer polyethylene [3LPE]), still concerns the oil and gas segment regarding pipeline integrity. The present work was part of a Program of Integrity Management and studied in field-like conditions the influence of cathodic potential, type of soil and coating system on the coating disbondment of buried pipelines for 450 days. The coating systems herein studied simulated the patching between aged (coal tar) and new coatings (3LPE), a standard procedure during damaged pipeline repair. Results pointed out that the combination between aged (coal tar) and new coatings (3LPE) in a pipe segment reduced coating disbondment when compared to the systems where 3LPE was the sole type of coating. Moreover, it was shown that more cathodic potentials (<−1100 mV) and the aggressiveness of the industrial soil herein tested induced disbondment diameters as high as 15.5 mm.

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“…In the realm of cathodic protection, the widely adopted approach is the applied current method. A representative diagram illustrating the integration of cathodic protection into the pipeline is presented in figure 3 [9]. A reliable indicator of the efficacy of pipeline cathodic protection is the cathodic protection potential.…”

Section: Introductionmentioning

confidence: 99%

Effect of DC grounding electrode currents on the corrosion interference behavior of cathodic protection of nearby pipelines

Chen,

Li,

Zhang

et al. 2023

Meas. Sci. Technol.

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When operating a direct current (DC) transmission grounding electrode in single-pole return ground mode, transient currents traverse the soil, generating stray currents. These currents can intensify the corrosion of long-distance transmission pipelines near the grounding electrode, subsequently altering the pipeline’s cathodic protection potential. Previous investigations into the interference of grounding electrodes on pipeline cathodic protection have overlooked the cathodic protection systems themselves. Addressing this gap, we integrated COMSOL’s electrochemical module with its AC/DC module. To corroborate the accuracy of our COMSOL-based models, we devised specific validation experiments. Additionally, we crafted a COMSOL application builder interface to streamline computations. Consequently, we derived a multi-regression function to express the cathodic protection potential of the pipeline under varied factors and executed a regression tree classification for soil resistivity. To pinpoint optimal corrosion protection for pipelines, we simulated the cathodic protection of segmentally isolated pipelines, determining that potential excursions can be notably mitigated. This research offers insights into both disturbance evaluation and protective strategies for DC transmission and pipelines.

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Assessment of cathodic protection effect on long‐distance gas transportation pipelines based on buried steel specimens

Cited by 8 publications

References 31 publications

Prediction of Chemical Corrosion Rate and Remaining Life of Buried Oil and Gas Pipelines in Changqing Gas Field

Prediction of Chemical Corrosion Rate and Remaining Life of Buried Oil and Gas Pipelines in Changqing Gas Field

Long‐term cathodic disbondment tests in three‐layer polyethylene coatings

Effect of DC grounding electrode currents on the corrosion interference behavior of cathodic protection of nearby pipelines

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