Selectivity in Improvement of Rheological Properties of Crude Oil
Vali Hanaqa Nurullayev,
Beybala Taci Usubaliyev,
Fikrat Suleyman Gehremanov
Issue:
Volume 3, Issue 1, June 2019
Pages:
1-8
Received:
12 March 2019
Accepted:
17 April 2019
Published:
27 May 2019
DOI:
10.11648/j.ajaic.20190301.11
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Abstract: Recently the steady tendency to increase in volumes of transportation, oil was outlined. Thus, developments new or optimization of the applied technologies of transportation of oil taking into account their rheological properties and operational characteristics of pipelines are necessary for the solution of a task of increase in volume of pumping of oil. Because of relevance of a problem, results of the pilot studies mixed crude oil by physical and chemical methods are of great interest. The researches conducted by us showed what when mixing crude oil should be considered a factor of interference of structures crude oil for the purpose of assessment inadmissible and optimum separate components of concentration. However many from used in the present a number of shortcomings, narrow have time of additives the spectrum of action, their insufficient solubility in the crude oils and oil products. Therefore development of new additives is relevant and has scientific and practical values.
Abstract: Recently the steady tendency to increase in volumes of transportation, oil was outlined. Thus, developments new or optimization of the applied technologies of transportation of oil taking into account their rheological properties and operational characteristics of pipelines are necessary for the solution of a task of increase in volume of pumping o...
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Electrochemical Corrosion Study of Buried Pipeline Steel X20 Affected by Stray Current
Fangfang Xing,
Chengtao Wang
Issue:
Volume 3, Issue 1, June 2019
Pages:
9-14
Received:
5 September 2019
Accepted:
21 September 2019
Published:
9 October 2019
DOI:
10.11648/j.ajaic.20190301.12
Downloads:
Views:
Abstract: With the continuous development of urban city, more and more subway lines are applied in the urban rail transit systems. During the daily operation of metro, the insulation performance between running rails and earth is gradually decreased. Thus, the stray current is generated at where the current flows out of the running rail. Stray current leakage and the corrosion caused by it are not negligible negative effects. Stray current corrosion will cause severe electrochemical corrosion to the metallic structures in and around the subway system, such as buried pipelines, running rails and concrete reinforcement etc. In view of the current situation of buried pipelines being affected by stray current corrosion, this paper starts with the stray current corrosion experiment of X20 pipeline steel. The experimental system was built up to simulate the stray current corrosion on the buried metallic pipeline. Electrochemical measurements including Tafel method and electrochemical impedance spectrum (EIS) were conducted in this study. Based on the measurement results and microscope morphology, the electrochemical corrosion process of X20 steel was discussed in detail Then the equivalent circuit model of the corrosion system was fitted and analyzed. It was found that the Nyquist plot of X20 corrosion system shows the characteristics of double capacitive reactance arc, and the corrosion system can be equivalent to a Rs(CPEporeRpore)(CPEdlRct) model. Finally, the stray current corrosion in the subway was introduced with engineering background, in which more influencing factors including microorganism, tube pressure, pH and water content value of soil, are pointed out for future research.
Abstract: With the continuous development of urban city, more and more subway lines are applied in the urban rail transit systems. During the daily operation of metro, the insulation performance between running rails and earth is gradually decreased. Thus, the stray current is generated at where the current flows out of the running rail. Stray current leakag...
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