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The purpose of this paper is to develop a real-time methodology to detect damages in coating and metallic structure in buried pipelines by using DC bias added to AC signal under field operation conditions, including cathodic protection.

Impedance measurements were performed on buried pipeline for different field conditions, to develop a methodology to detect and locate damages by impedance distribution along the metallic structure.

Field condition measurements were conducted as a pilot test on a buried steel pipeline segment with a diameter of 16 inches and length of 20 km. The frequency-based technology shows some differences but overall good behavior between impedance magnitudes vs localization of the interface changes at the soil-coating-steel interface at different frequencies using DC bias added to AC signal under field operation conditions, including cathodic protection.

The methodology is not applicable to highly resistive soil or high degradation coatings.

In this work, we depict a methodology that describes real time monitoring technology for buried metallic structures using AC signal. This monitoring is capable to detect and locate real time damage occurrences on the pipe surface (coating break). Field measurements include different conditions, such as temperature, soil resistivity and soil physical structure and chemical composition.

In consideration of the satisfied application in the field of the methodology, it is believed that it can be used for the monitoring of damages in pipes in areas with high consequences and hence pipe integrity can be increased.

This real-time methodology is based on the impedance distribution signal and the differential changes along the pipeline under operating conditions. The results showed good agreement with the proposed methodology, which is able to discriminate some situations inherent of field conditions by using different impedance measurements performed along ±10 km of buried steel pipeline and assuming the reference location as the cathodic protection set up.

The purpose of this paper is to study the corrosion rate for X52, X60, X65, X70 and X80 steel immersed in Mexican oilfield produced water. For the electrochemical characterization of the five steels rotating disk electrodes, 20°C, 30°C and 45°C of experimental temperature and 0, 500, 1,000 and 2,000 rpm of rotation speed were taken into account. The temperature dependence was analyzed using Arrhenius law. Thus, Rct values obtained from EIS data in comparison with the corrosion rate obtained from polarization curves data were taken into account. Hydrodynamic effects were analyzed by Rct and corrosion rate data.

Electrochemical impedance spectroscopy and potentiodynamic polarization techniques were used to assess the electrochemical behavior for five pipe steels steel immersed in a natural solution.

The resistance and corrosion rate taken from electrochemical tests decreased as temperature and hydrodynamic condition also decreased. In addition, the Arrhenius parameter revealed that the natural solution increased the corrosion rate as the activation energy decreased. Typical branches related to reduction-oxidation reaction (dissolution-activation process or corrosion products dissolution) on steel surface were discussed. Optical images analysis shows that corrosion products for X65 steel exposed to oilfield produced water can be attributed to more susceptibility to corrosion damage for this steel grade (Quej-Ake et al., 2018), which is increased with the temperature and rotation speed of the working electrode.

Corrosion process of the five steels exposed to oilfield produced water could be perceptive when Arrhenius analysis is taken into account. This is because oilfield produced water is the most aggressive condition (brine reservoir and sour water) for internal pipelines walls and storage tanks (brine tanks). Thus, stagnant condition was considered as a more extreme corrosive condition because produced water is stored in atmospheric stationary tanks as well as it is transported under laminar condition in zones where oilfield produced water is maintaining in the bottom of the pipe during the production, transporting and storing of the crude oil. In addition, a brief operational process for Reynolds number and the flowrate of the stock tank barrel per day (Q in STBD) using field and Reynolds number data is discussed.

The purpose of this study is to analyze to what extent the strategic actions implemented by the libraries contribute to the containment of the pandemic caused by COVID-19, without compromising the quality of library services for their learning communities.

The research has a mixed methodology: qualitative and quantitative with a technique of documentary review and statistical analysis of data through FanPage Karma software. The documents are public and are part of the teaching programs of the universities, webinars and courses given through accounts and official sites of the Mexican Federal Government, social networks, as well as groups of experts in national and international librarianship.

The research documents and describes the library services that have emerged in libraries since the quarantine and isolation period established by the Ministry of Public Education. It also shows the strategic actions adopted by universities (their advantages and disadvantages) and the digital competencies of the library professionals to meet the information demands of their communities. Additionally, actions implemented to provide a rapid response are discussed so that they can later be improved to have a comprehensive framework for improving quality in the remote library service.

This research contributes value to the field by critically analyzing libraries’ distance services, their innovations and the necessary professional competences required to achieve the institutional academic goals. Additionally, relevant services in the digital context are described.

The purpose of this paper is to report and to regulate the users’ documentary necessities of six Mexican universities involved, in a cooperative manner and during the period of confinement by SARS-CoV-2, through the Document Delivery Service (DDS).

A diagnostic was conducted within the participating institutions that considered the information resources and sources, documents requested and the number of users per institution, which were counted daily for one month. This research used documentary and quantitative methods.

The authors determined that DDS is a reliable service for information supply although it is going to be necessary to adjust legal schemes and interlibrary loan policies to develop a process and to adapt this one to the current information services in the future or “in our new normality”; DDS will have a high impact on the conformation of networks of librarian cooperation.

This study exposed the importance of DDS as a relevant service to provide information on demand by using information and communication technologies, which is a safe way to operate, avoiding exposure to physical contact, ensuring the continuity of research processes in the communities and always monitoring and promoting the copyright.