Investigation of Corrosion of Buried Oil Pipeline by the Electrical Geophysical Methods

Ekine, Anthony S.; Emujakporue, Godwin Omokenu

doi:10.4314/jasem.v14i1.56492

Cited by 21 publications

(14 citation statements)

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“…For example, garlic, castor seed, carrot, mustard seeds etc. contains alkaloid berberine which has a long chain of aromatic rings and an N atom in the ring that serves as inhibitive effects [28]. In this work a consideration is made on the Vernomia amydalina (VA) inhibitor, to see its effectiveness and efficiency on pipelines found in a marine environment.…”

Section: Green Corrosion Inhibitorsmentioning

confidence: 99%

Analysis of the Effectiveness and Efficiency of the VA Solution on Offshore Pipelines and Ship Materials

Nitonye¹,

Ugboga²

2020

OJMS

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The analysis of the effectiveness and efficiency of Vernomia amydalina (VA) solution as an inhibitor on offshore pipeline and Ship materials (Steel) was carried out with the preparation of the specimen and the VA solution. The specimens were kept in a workable state and the VA Solution (inhibitor) prepared from 1200 g of bitter leaf was plucked, weighed and crushed separately. 600 cl of water was added to each of the crushed leaves. The mixture was put in a filter cloth and squeezed with hand to filter out the active concentration ingredients responsible for corrosion inhibition, which produced a 2 M concentration of VA extract solution. After the experiment was carried out the specimen was air-dried and weighed to determine the corrosion rate and weight loss. This was followed by the determination of the inhibitor efficiency at the different hours and at different percentage/concentration of the VA solution on the specimen. Results were obtained for different hours and at different percentage (0%, 5%, 10%, 15%, 20% and 25% inhibitor)/concentration of the VA solution and graphs plotted. It was observed that at the first week of exposure to corrosive medium there was a substantial reduction in weight of coupons but over the next three weeks there was a gradual decline in weight loss and the corrosion rate reduced evenly. It can be said that the percentage of inhibitor to corrosive medium is insufficient. From the graphs plotted, the inhibitor efficiency is considered high when the concentration of the VA solution is high, which implies a right percentage of inhibitor needs to be administered to obtain good efficiency of the solution. Hence as the weeks go by it was clear that the inhibitor was gradually losing its effectiveness. This means that inhibitors need to be added at regular intervals to sustain the effectiveness of the inhibitor. It is also of vital interest to apply the right concentration of inhibitor since CR increases at high concentrations and temperature. This process did not take into consideration moving water. How to cite this paper: Nitonye, S. and Ugboga, P. (2020) Analysis of the Effectiveness and Efficiency of the VA Solution on Offshore Pipelines and Ship Materials.

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Section: Green Corrosion Inhibitorsmentioning

confidence: 99%

Analysis of the Effectiveness and Efficiency of the VA Solution on Offshore Pipelines and Ship Materials

Nitonye¹,

Ugboga²

2020

OJMS

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“…In the nature of the metal we must look at the passivity of metal, the purity of the metal, the oxidation potential, over-voltage and the relative area of the anode and cathode amongst others. Furthermore the nature of the environment of exposure will consider the following factors such as the temperature, concentration of Hydrogen ions and the soil corrosivity [5].…”

Section: Corrosionmentioning

confidence: 99%

Comparative analysis of the effect of Vernonia amygdaline on subsea transmission pipeline

Nitonye

Nwaoha

Emmanuel

2018

Journal of Mechanical and Energy Engineering

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Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 (CC BY 4.0) International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Abstract: Subsea transmission pipelines (STP) are designed to transport liquids, gases or solid/liquid mixtures over some distances. STP are buried underground or submerged in water for transportation of natural oil and gas (O&G) products. A Vernonia amygdalina (VA) solution is prepared to act as an inhibitor. The specimens are kept in a workable state. Steps are taken to prepare each specimen. All cuts and sheared edges were ground out to prevent them from becoming sites for preferential attack. The finishing of the specimen surface with grit abrasive paper (sand paper) and rinsing of the specimens in distilled water are carried out. Then, degreasing of specimen in acetone and air-dried are carried out. Upon drying, the specimens are immediately weighed to obtain their initial weights. Twelve specimens are used for the test as follows: 6 Aluminum (Al); and 6 mild steel (MS) samples. With a 2M concentration of VA solution, the MS and Al samples are immersed in different plastic containers containing 400ml of seawater with pH value of 7.25 with no (0%) inhibitor added to it. A 5% (400ml) of the VA solution is poured into the measuring cylinder for each sample-Al and MS. The specimens are suspended by the strings and completely immersed in the different percentage test media. The same procedure is carried out for each of the different percentages (i.e. 10%, 15%, 20%, and 25%) and a total of 12 solutions are set up. The seawater used has 7.25 pH. At the end of every week (168 hours), the specimens are removed from the corrosive media. Observation and recording of appearance of the specimen, noting sites are done to analyze the effect of the VA solution on the AL and MS used for the STP. Values are obtained and graphs plotted on weight loss (WL) and corrosion rate (CR) versus the time. It is observed that the VA solution has different effect on the STP at different time and percentage of the VA solution introduced into the environment of the pipe. It was also observed that optimum inhibition of coupons is obtained between 15-25% of VA solution during the first four weeks of testing. At the fifth week, the inhibitor was gradually losing its effectiveness. This means that more inhibitor needs to be added at regular intervals in order to sustain the effectiveness of the inhibitor.

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“…Due to electrochemical oxidation processes that induce corrosion of cast iron pipes, products such as iron oxides are released into the surround soil, increasing the soil conductivity and decreasing permittivity (Ekine and Emujakporue, 2010). This release of ions into the soil increases the total dissolved salt content and electrical conductivity, which can further accelerate the corrosion process and increase its extent, while modifying the soil's physical and chemical properties differentially with distance to the pipes.…”

Section: Introductionmentioning

confidence: 99%

Alteration of Soil Support to Cast Iron Pipelines due to Corrosion

et al. 2013

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This paper describes research into the effects of corroding cast iron pipes on the properties of surrounding clay soil. Accelerated corrosion tests, employing electrokinetics to simulate the galvanic cell that is set up naturally when cast iron comes into contact with clay, have shown that the chemical changes (e.g. pH) are more marked than for cases in which inert electrodes were used. These chemical changes result in both cast iron and clay mineral dissolution, ion migration and the precipitation of reaction products close to, and to a lesser degree away from, the pipe wall. The paper describes a laboratory study of the effects on a pure form of kaolinite after different lengths of electrokinetic treatment and draws conclusions on the potential effects that are likely to be found for old cast iron pipes in clays.

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Investigation of Corrosion of Buried Oil Pipeline by the Electrical Geophysical Methods

Cited by 21 publications

References 0 publications

Analysis of the Effectiveness and Efficiency of the VA Solution on Offshore Pipelines and Ship Materials

Analysis of the Effectiveness and Efficiency of the VA Solution on Offshore Pipelines and Ship Materials

Comparative analysis of the effect of Vernonia amygdaline on subsea transmission pipeline

Alteration of Soil Support to Cast Iron Pipelines due to Corrosion

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