Research and Application of Portable Real Protection Potential Measurement System of Buried Steel Pipeline

2012 ◽  
Vol 605-607 ◽  
pp. 1042-1045
Author(s):  
Xue Fen Zhao
Keyword(s):  
Reference Electrode ◽  
Buried Pipeline ◽  
Stray Current ◽  
Potential Measurement ◽  
Ir Drop ◽  
Surface Data ◽  
Electrode Method ◽  
Protection Potential ◽  
Data Acquisition Unit ◽  
Ground Potential

The measurement of pipeline to ground potential is the most common method to evaluate protection condition of buried pipeline. For the old pipeline, pipeline to ground potential measured with surface reference electrode method or reference electrode method close to pipeline usually is not the real protection potential of buried pipeline due to presence of an IR drop and/or stray current interference. A portable real protection potential measurement system combining the polarized probe with the portable surface data acquisition unit is developed, the polarized probe can measure the real protection potential by eliminating IR drop and/or stray current interference, meanwhile portable surface data acquisition unit can automatically record protection potential. The on-site application of the system show that the system can quickly and accurately measure the protective potential of buried pipeline, reduce human measurement error, and really reflect the cathodic protection condition of pipeline.

scholarly journals Experimental Study on the Influence of AC Stray Current on the Cathodic Protection of Buried Pipe

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Qingmiao Ding ◽  
Yueming Fan
Keyword(s):  
Experimental Study ◽  
Cathodic Protection ◽  
Comprehensive Analysis ◽  
Stray Current ◽  
Buried Pipe ◽  
Ir Drop ◽  
Threshold Length ◽  
Protection Potential ◽  
Ground Potential ◽  
Coating Crack

The size of the damaged area of the coating and its position on the pipeline impacted the cathodic protection potential, and there was a damaged area of the greatest impact value. When damaged area was 300 mm2, the IR drop was the largest, and this situation could easily lead to inadequate protection; when the parallel spacing between pipeline and interference source was unchanged, the measured value curves of cathodic protection potential presented “U” shaped trend with the increasing stray current interference intensity. Under certain parallel spacing between pipeline and interference source, high alternating stray current intensity would cause serious negative offsets, so that the overprotection of the pipeline occurred, and make the coating crack; there was a parallel threshold length. When less than the threshold, the pipe-ground potential increases rapidly with the parallel length increasing. In order to judge whether a pipeline was interference by AC stray current and the risk of stray current corrosion, we should make a comprehensive analysis of the cathodic protection energizing potential, the switch-off potential, AC pipe-soil potential, IR drops, and so on.

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.

Evaluation of Stray Current Effect on the Cathodic Protection of Underground Pipeline

1996 ◽  
Author(s):  
K. W. Park ◽  
Y. B. Cho ◽  
K. S. Jeon ◽  
S. M. Lee ◽  
Y. T. Kho
Keyword(s):  
Cathodic Protection ◽  
Drainage System ◽  
High Standard ◽  
Considerable Effect ◽  
Mean Value ◽  
Distribution Analysis ◽  
Underground Pipeline ◽  
Stray Current ◽  
Transit System ◽  
Potential Measurement

Two types of stray current which affect the cathodic protection of underground pipeline are discussed. One is the stray current by DC transit system and the other is that originated from the nearby cathodic protection system. The popular evaluation methods of the pipe-to-siol potential measurement was undertaken to evaluate the corrosion activity of pipeline. In case when the pipe was affected by the stray current, the measured pipe-to soil potential was significantly deviated from the mean value resulting in normal distribution. Analysis of such distribution pattern has revealed that the pipe under investigation was in the condition of insufficient protection (noble mean potential and high asymmetry coefficient) due to the considerable effect of stray current (high standard deviation value). It was also confirmed that the efficiency of drainage system was so low (<10%) due to the improper selection of drainage point. Simultaneous measurement of the magnitude and direction of the sheath current resulted in information about the place where stray current entered into pipe and escaped to soil. For the second case of stray current problem, it is shown that it has been caused by the combined interference from nearby CP system.

Magnetic Amplifier Type Recording Instrument For Electrolysis Survey

CORROSION ◽  
1956 ◽  
Vol 12 (11) ◽  
pp. 33-36
Author(s):  
MICHIO TANAKA ◽  
JIRO YAMAGUCHI ◽  
YOSHIFUMI SAKURAI
Keyword(s):  
Field Tests ◽  
Input Voltage ◽  
Power Source ◽  
Current Measurement ◽  
Recording Instrument ◽  
Metallic Structures ◽  
Potential Measurement ◽  
Magnetic Amplifier ◽  
Ground Potential ◽  
A Current

Abstract In order to make plans for corrosion control of underground metallic structures it is necessary to survey the sheath current and potential against the ground. A current and voltage recording instrument which was designed for making an electrolysis survey is described and field tests results are reported. The instrument consists of a push-pull self-saturation type magnetic amplifier and a conventional electrical recording voltmeter. It was found to perform as follows:For obtaining 0.6 volt (this corresponds to the full scale 50 mm in the recording meter used), input voltage of the amplifier with Mo-Permalloy cores was 0.48 millivolt for sheath current measurement and 740 millivolts for cable to ground potential measurement in case of the power source of 90 cps with rectangular wave form.Response time was 7 cycles for current measurement and 4.5 cycles for voltage measurement.When the source was supplied from the power line (60 cps), the amplification factors decreased about 10 to 35 percent. The device had good stability, negligible drift and rugged construction. Therefore it is clear that this device is suitable for field test. 4.5.3

scholarly journals The Effect of pH and Concentration of KNO3 Solution to the Performance of Nd3+ Ion Selective Electrode Using HPMBP Ionophore

2018 ◽  
Vol 3 (3) ◽  
pp. 193
Author(s):  
Husain Sosidi ◽  
Buchari Buchari ◽  
Indra Noviandri
Keyword(s):  
Ion Selective Electrode ◽  
Selective Electrode ◽  
Buffer Solution ◽  
Potential Measurement ◽  
Ph Variation ◽  
Measurement Results ◽  
Optimum Ph ◽  
Electrode Method ◽  
Potentiometric Analysis ◽  
Ph Range

<p>The phenyl-3-methyl-4-benzoyl-5-pyrazolone (HPMBP) synthesized and characterized as ionophore in potentiometric analysis of ion selective electrode method (ISE) with polytetrafluoroethylene (PTFE) as the supporting phase. The pH and concentration of the ionic strength adjuster (ISA) were varied to know at the optimum pH and concentration of the ion-selective electrode (ESI) KNO<sub>3</sub>, thus potential Nd<sup>3+</sup> gives the best performance. Before use the PTFE membrane was immersed in a chloroform-HPMBP solution of 1.5-2.0% w/v for 24 h. The pH variation of the buffer solution was adjusted to the pH range of 2-10 using HCl and NaOH solutions, whereas the concentration of KNO<sub>3</sub> varies from 10<sup>-1</sup> to 10<sup>-3</sup> M. The concentration range of Nd<sup>3+</sup> is between 10<sup>-2</sup> and 10<sup>-7</sup> M. The electrode potential measurement results (E<sub>Nd</sub>) obtained the best performance value at pH 4 with KNO<sub>3</sub> concentration of 10<sup>-2</sup> M, sensitivity (S) 18.39 ± 1.2 mV/decade and response time less than 23 s.</p>

scholarly journals Valve-Actuator-Integrated Reference Electrode for an Ultra-Long-Life Rumen pH Sensor

Sensors ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 1249
Author(s):  
Shogo Higuchi ◽  
Hironao Okada ◽  
Seiichi Takamatsu ◽  
Toshihiro Itoh
Keyword(s):  
Ph Monitoring ◽  
Ph Sensor ◽  
Reference Electrode ◽  
Ph Sensors ◽  
Liquid Junction ◽  
Reference Electrodes ◽  
Potential Measurement ◽  
Rumen Ph ◽  
Long Life ◽  
Intermittent Measurement

We demonstrated a newly developed Ag/AgCl reference electrode- with a valve-actuator for two years or longer rumen pH monitoring. Previous studies on pH sensors reported that the short lifetime of Ag/AgCl reference electrodes is caused by an outflow of internal electrolyte. We introduced a valve-actuator into a liquid junction to reduce the outflow by intermittent measurement. The results indicated that the potential change when switching the liquid junction was less than 0.5 mV and its response time was less than 0.083 s. In the 24-h potential measurement with the valve-actuator-integrated reference electrode (VAIRE), the valve was actuated once every hour, and the standard deviation of the potential was 0.29 mV. The lifetime of the VAIRE was estimated at 2.0 years calculating from an electrolyte outflow, which is significantly longer than that of conventional reference electrodes. A pH sensor using the VAIRE was estimated to operate for 2.0 years with the pH error ≤0.1, which meets the requirement of cows’ rumen pH monitoring.

Corrosion behavior of X80 steel under disbond coating interfered with AC

2019 ◽  
Vol 66 (6) ◽  
pp. 704-718
Author(s):  
Qingmiao Ding ◽  
Zili Li ◽  
Tao Shen ◽  
Gan Cui
Keyword(s):  
Corrosion Behavior ◽  
Current Density ◽  
Corrosion Current Density ◽  
Corrosion Potential ◽  
Corrosion Current ◽  
The Self ◽  
Stray Current ◽  
Content Type ◽  
X80 Steel ◽  
Protection Potential

Purpose This paper aims to research the corrosion behavior of the metal under the disbonded coatings interfered with AC through electrochemical method. Design/methodology/approach The corrosion behavior of the metal under disbond coating interfered with alternate stray current (AC) was studied by electrochemical methods using the rectangular coating disbonded simulator. The obtained data from electrode potential test, electrochemical impedance spectroscopy (EIS) and polarization curves in simulated soil solution indicated that under the natural corrosion condition, the self-corrosion potential and the corrosion current density of the metal at different depths under disbond coating had obviously changed if there was AC interference. Findings The self-corrosion potential of the metal at the same depths under disbond coating shifted negatively with the rising of the AC voltage. Under the condition of cathode polarization, there was still obvious potential gradient with the extension of the deep peeling of the coating gap, and the corrosion current density of the test points was minimum, and the protection effect was best when the cathode protection potential was −1.0 V. When the metal was applied with over-protection, the corrosion rate of the metal increased as AC stray current flowing through it increased. Originality/value This paper used the rectangular aperture device to study the corrosion behavior of X80 steel under the disbonded coatings through electrochemical methods when the AC stray current interference voltage was 0V, 1V, 5V or 10V and the protection potential was 0V, −0.9V, −1.0V, −1.2V or −1.3V, respectively. There is great significance to the safe operation and long-term service of pipeline steel in soil environment.

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