A Galvanic Sensor for Monitoring the Corrosion Damage of Buried Pipelines: Part 3—Correlation of Probe Current to Cathodic Protection and Stray Current

CORROSION ◽  
2007 ◽  
Vol 63 (10) ◽  
pp. 951-957 ◽  
Author(s):  
Y-S. Choi ◽  
J-G. Kim ◽  
J-Y. Koo
Keyword(s):  
Cathodic Protection ◽  
Corrosion Damage ◽  
Buried Pipelines ◽  
Stray Current ◽  
Probe Current ◽  
Galvanic Sensor

Study on interference and protection of pipeline due to high-voltage direct current electrode

2019 ◽  
Vol 37 (3) ◽  
pp. 273-281 ◽  
Author(s):  
Yang Chao ◽  
Li Jianliang ◽  
Li Zili ◽  
Zhang Shouxin ◽  
Dai Long ◽  
...  
Keyword(s):  
High Voltage ◽  
Direct Current ◽  
Cathodic Protection ◽  
Current Source ◽  
Buried Pipelines ◽  
Stray Current ◽  
Current Electrode ◽  
Protective Measures ◽  
High Voltage Direct Current ◽  
Pipe Section

AbstractTo study the rules of interference and protective measures on buried pipelines of high-voltage direct current (HVDC), the influence of different factors, including current into soil, soil resistance, damaged rate of coatings, and electrode-to-pipe distance, on pipe-to-soil potential deviation were simulated. Based on the simulated results, the fitted equations and interference judgment pattern were also obtained. The protective measures of insulation and cathodic protection can be performed for buried pipelines to prevent the interference, but the cathodic protection in the isolated area may become the stray current source of the other pipe section. This study can provide suggestions for the evaluation of interference and protective measures of pipelines of HVDC.

scholarly journals Effects of non-stationary stray current on carbon steel buried pipelines under cathodic protection

2021 ◽  
Vol 281 ◽  
pp. 122645
Author(s):  
Marco Ormellese ◽  
Silvia Beretta ◽  
Fabio Brugnetti ◽  
Andrea Brenna
Keyword(s):  
Carbon Steel ◽  
Cathodic Protection ◽  
Buried Pipelines ◽  
Stray Current

Study on the interference corrosion of cathodic protection system

2015 ◽  
Vol 33 (5) ◽  
pp. 233-247 ◽  
Author(s):  
Gan Cui ◽  
Zili Li ◽  
Chao Yang ◽  
Xu Wei
Keyword(s):  
Cathodic Protection ◽  
Great Influence ◽  
Simulation Software ◽  
Protection System ◽  
Buried Pipelines ◽  
Stray Current ◽  
Damage Rate ◽  
Soil Conductivity ◽  
Cathodic Protection System ◽  
The Mathematical Model

AbstractDC stray current has a great influence on the corrosion of buried pipelines. In this article, first, we deduce the equation of DC stray current interference on pipeline and determine the corresponding boundary conditions. Second, we discretize the mathematical model with boundary element method. Third, the numerical simulation software BEASY is applied to study the interference corrosion of cathodic protection system. Five types of cathodic protection (CP) interference are considered, namely, anodic, cathodic, combined, induced, and joint interference. Moreover, the effects of different parameters on the degree of the CP interference are investigated. The results show that the degree of interference will decrease with the increase of soil conductivity; smaller coating damage rate will make interference more concentrated; anode parameters have a significant impact on anodic interference but have almost no effect on cathodic interference; for combined, induced, and joint interference, the likelihood for corrosion occurrence will be high at the current outflow point on pipeline.

An Array of Multielectrodes for Locating, Visualizing, and Quantifying Stray Current Corrosion

CORROSION ◽  
10.5006/2828 ◽  
2018 ◽  
Vol 74 (10) ◽  
pp. 1093-1101 ◽  
Author(s):  
Ke Wang ◽  
Facundo Bob Varela ◽  
Mike Yongjun Tan
Keyword(s):  
Cathodic Protection ◽  
Laboratory Simulation ◽  
Buried Pipeline ◽  
Stray Current ◽  
Simulation Experiments ◽  
Corrosion Rates ◽  
Pipeline Corrosion ◽  
Probe Array

An array of multielectrode corrosion probes, designed based on a series of coupled wire beam electrodes (WBEs), has been devised as a new tool for locating, visualizing, and quantifying the effects of stray currents on buried pipeline corrosion. It has been demonstrated in laboratory simulation experiments that this WBE probe array is capable of detecting stray current corrosion affected sites along a pipeline, visualizing stray current corrosion patterns and corrosion rates, and evaluating the efficiency of cathodic protection against stray current corrosion. Based on these results, two applications of this WBE probe array have been proposed for stray current corrosion survey and monitoring.

Effect of Transitions in the Water Table and Soil Moisture Content on the Cathodic Protection of Buried Pipelines

2011 ◽  
Vol 133 (1) ◽  
Author(s):  
Fraser King ◽  
Russell Given ◽  
Robert G. Worthingham ◽  
Greg Van Boven
Keyword(s):  
Moisture Content ◽  
Water Table ◽  
Cathodic Protection ◽  
Field Measurements ◽  
Field Trials ◽  
High Resistivity ◽  
Buried Pipelines ◽  
Pipe Surface ◽  
Degree Of Protection ◽  
O2 Concentration

Buried pipelines can be subject to transitional environments due to changes in soil type or moisture content. Changes in the height of the water table, for example, will affect not only the availability of water but also the access of oxygen to the pipe surface. Transitions between different soil types will also result in different exposure conditions for different parts of the pipe. These variations can affect the distribution of potential on the pipe surface and the ability of the CP system to provide adequate protection. A combination of laboratory-scale soil box tests and field measurements on operating pipelines has been used to study the effect of varying moisture content and water level on the level of cathodic protection and on pipe-depth environmental conditions. In both laboratory tests and field trials, the degree of protection was found to depend on the availability of cathodic reactants (O2 and/or H2O). Ingress of O2 results in a positive shift in potential as more current is required to electrochemically reduce the oxidant and the pipe is less easily polarized. Under some circumstances, the ingress of water has the same effect. Although more aerobic conditions lead to more positive potentials, the pipe is not necessarily less well protected. In many dry and/or high resistivity soils, the pipe surface may well be passive because of the high interfacial pH and/or high O2 concentration.

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