The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
Silvio Hamacher - One of the best experts on this subject based on the ideXlab platform.
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accelerating benders stochastic decomposition for the optimization under uncertainty of the Petroleum Product supply chain
Computers & Operations Research, 2014Co-Authors: Fabricio Oliveira, Ignacio E Grossmann, Silvio HamacherAbstract:This paper addresses the solution of a two-stage stochastic programming model for a supply chain investment planning problem applied to the Petroleum Products supply chain. In this context, we present the development of acceleration techniques for the stochastic Benders decomposition that aim to strengthen the cuts generated, as well as to improve the quality of the solutions obtained during the execution of the algorithm. Computational experiments are presented for assessing the eciency of the proposed framework. We compare the performance of the proposed algorithm with two other acceleration techniques. Results suggest that the proposed approach is able to eciently solve the problem under consideration, achieving better performance better in terms of computational times when compared to other two techniques.
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optimization of the Petroleum Product supply chain under uncertainty a case study in northern brazil
Industrial & Engineering Chemistry Research, 2012Co-Authors: Fabricio Oliveira, Silvio HamacherAbstract:This Article addresses the problem of optimizing the investment planning process of a logistics infrastructure for the distribution of Petroleum Products under uncertainty. For this purpose, a two-stage stochastic model was developed. Because of the large number of possible scenarios for the future realization of demands, the Sample Average Approximation (SAA) methodology was used to produce approximations of the optimal solution. The proposed model and solution methodology were applied to a real case study on the distribution of Petroleum Products in northern Brazil. The results show that the methodology allows us to obtain solutions that are relatively close to the real optimal solution of the problem with optimality gaps estimated at up to 1%, which are reasonable for most practical purposes.
Gang Wu - One of the best experts on this subject based on the ideXlab platform.
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comparison of china s oil import risk results based on portfolio theory and a diversification index approach
Energy Policy, 2009Co-Authors: Gang WuAbstract:In recent years, the international oil price has fluctuated violently, bringing about huge risk for the international oil trade. In fact, the risk of crude oil and Petroleum Product imports is different because of the different import origins and prices. Which import risk is lower for China? From the perspective of oil supply security, how should China portfolio crude oil and Petroleum Product imports to minimize its oil import risk? Using portfolio theory and a diversification index approach, this paper compares and analyzes the supply, price and transport risks of crude oil and Petroleum Product imports. Our results show that the following: (1) Specific risk (diversification risk) and marine transport risk of China's Petroleum Product imports are lower than that of crude oil imports. (2) The average rate of return of China's Petroleum Product imports is higher than that of crude oil imports. Moreover, the average import price variance of Petroleum Product imports is lower than that of crude oil imports. Thus, the systematic risk (price risk) of Petroleum Products is lower too. Therefore, from the perspective of oil supply security, China should increase Petroleum Product imports to decrease its oil import risk.
Sundaram Maruthamuthu - One of the best experts on this subject based on the ideXlab platform.
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microbial corrosion in Petroleum Product transporting pipelines
Industrial & Engineering Chemistry Research, 2011Co-Authors: Sundaram Maruthamuthu, Baskaran Dinesh Kumar, Shanmugavel Ramachandran, Palani Subramanian, Seeni Palanichamy, M. Chandrasekaran, B. Anandkumar, Nirmala PalaniswamyAbstract:Petroleum Product pipelines in India contain large numbers of various types of microorganisms that either directly or indirectly enhance corrosion. Field studies have been carried out by CSIR-CECRI to investigate the corrosion problem in Petroleum Product transporting pipelines in South India. Although Unicor J inhibitor was added in the pipeline to control corrosion, corrosion Products were detected in the pipeline. The present study reveals that the degradation of the inhibitor enhances the proliferation of bacteria, which enhances the corrosion. The selection of an inhibitor to control corrosion has also been done.
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Characterization of corrosive bacterial consortia isolated from Petroleum-Product-transporting pipelines
Applied Microbiology and Biotechnology, 2010Co-Authors: Aruliah Rajasekar, B. Anandkumar, Sundaram Maruthamuthu, Yen-peng Ting, Pattanathu K. S. M. RahmanAbstract:Microbiologically influenced corrosion is a problem commonly encountered in facilities in the oil and gas industries. The present study describes bacterial enumeration and identification in diesel and naphtha pipelines located in the northwest and southwest region in India, using traditional cultivation technique and 16S rDNA gene sequencing. Phylogenetic analysis of 16S rRNA sequences of the isolates was carried out, and the samples obtained from the diesel and naphtha-transporting pipelines showed the occurrence of 11 bacterial species namely Serratia marcescens ACE2, Bacillus subtilis AR12, Bacillus cereus ACE4, Pseudomonas aeruginosa AI1, Klebsiella oxytoca ACP, Pseudomonas stutzeri AP2, Bacillus litoralis AN1, Bacillus sp., Bacillus pumilus AR2, Bacillus carboniphilus AR3, and Bacillus megaterium AR4. Sulfate-reducing bacteria were not detected in samples from both pipelines. The dominant bacterial species identified in the Petroleum pipeline samples were B. cereus and S. marcescens in the diesel and naphtha pipelines, respectively. Therefore, several types of bacteria may be involved in biocorrosion arising from natural biofilms that develop in industrial facilities. In addition, localized (pitting) corrosion of the pipeline steel in the presence of the consortia was observed by scanning electron microscopy analysis. The potential role of each species in biofilm formation and steel corrosion is discussed.
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biodegradation of corrosion inhibitors and their influence on Petroleum Product pipeline
Microbiological Research, 2007Co-Authors: Aruliah Rajasekar, Sundaram Maruthamuthu, N Palaniswamy, Annamalai RajendranAbstract:Summary The present study enlightens the role of Bacillus cereus ACE4 on biodegradation of commercial corrosion inhibitors (CCI) and the corrosion process on API 5LX steel. Bacillus cereus ACE4, a dominant facultative aerobic species was identified by 16S rDNA sequence analysis, which was isolated from the corrosion Products of refined diesel-transporting pipeline in North West India. The effect of CCI on the growth of bacterium and its corrosion inhibition efficiency were investigated. Corrosion inhibition efficiency was studied by rotating cage test and the nature of biodegradation of corrosion inhibitors was also analyzed. This isolate has the capacity to degrade the aromatic and aliphatic hydrocarbon present in the corrosion inhibitors. The degraded Products of corrosion inhibitors and bacterial activity determine the electrochemical behavior of API 5LX steel.
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role of corrosion inhibitor on bacterial corrosion in Petroleum Product pipelines
Indian Journal of Chemical Technology, 2005Co-Authors: Sundaram Maruthamuthu, Aruliah Rajasekar, Palani Subramanian, S Mohanan, N Muthukumar, S Ponmarippan, Nirmala PalaniswamyAbstract:Petroleum Product pipelines in India are found to contain a large number of various types of microorganisms either aerobic or anaerobic and these microorganisms either directly or indirectly enhance corrosion. Field studies have been carried out by CECRI to investigate the corrosion problem in a cross-country pipeline transporting Petroleum Product (diesel) for about 1400 km. Heterotrophic bacteria, iron bacteria, manganese oxidizers, acid producers were enumerated and identified in the pipeline whereas SRB could not be noticed in the pipeline. The reason for the absence of SRB is explained in the present study. Moreover, the interaction between heterotrophic and chemolithotrophic bacteria is explained with FTIR and NMR analysis. Influence of inhibitor on microbial corrosion has been investigated and the importance of selection of inhibitor has also been explained.
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microbiologically influenced corrosion in Petroleum Product pipelines a review
Indian Journal of Experimental Biology, 2003Co-Authors: N Muthukumar, Aruliah Rajasekar, Palani Subramanian, Sundaram Maruthamuthu, Nirmala Palaniswamy, S Mohanan, S Ponmariappan, S Muralidharan, M RaghavanAbstract:Microbiologically influenced corrosion is responsible for most of the internal corrosion problems in oil transportation pipelines and storage tanks. One problematic area in treating gas lines is the occurrence of the stratification of water in the line. Under these conditions, corrosion inhibitors do not come into contact properly and oil and inhibitors undergo degradation. The role of bacteria on oil degradation, the consequences of oil degradation in fuel systems and its influence on corrosion have been explained in detail. Besides, factors influencing on degradation of oil and corrosion inhibitors have also been discussed. Mechanism of microbiologically influenced corrosion in oil pipeline has been explained. Many of the misapplication of biocides/inhibitors occur mainly because the characteristics of biocides/inhibitors are not considered before use in pipeline industry. List of biocides and monitoring programme have been collected from literature and presented.
Fabricio Oliveira - One of the best experts on this subject based on the ideXlab platform.
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accelerating benders stochastic decomposition for the optimization under uncertainty of the Petroleum Product supply chain
Computers & Operations Research, 2014Co-Authors: Fabricio Oliveira, Ignacio E Grossmann, Silvio HamacherAbstract:This paper addresses the solution of a two-stage stochastic programming model for a supply chain investment planning problem applied to the Petroleum Products supply chain. In this context, we present the development of acceleration techniques for the stochastic Benders decomposition that aim to strengthen the cuts generated, as well as to improve the quality of the solutions obtained during the execution of the algorithm. Computational experiments are presented for assessing the eciency of the proposed framework. We compare the performance of the proposed algorithm with two other acceleration techniques. Results suggest that the proposed approach is able to eciently solve the problem under consideration, achieving better performance better in terms of computational times when compared to other two techniques.
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optimization of the Petroleum Product supply chain under uncertainty a case study in northern brazil
Industrial & Engineering Chemistry Research, 2012Co-Authors: Fabricio Oliveira, Silvio HamacherAbstract:This Article addresses the problem of optimizing the investment planning process of a logistics infrastructure for the distribution of Petroleum Products under uncertainty. For this purpose, a two-stage stochastic model was developed. Because of the large number of possible scenarios for the future realization of demands, the Sample Average Approximation (SAA) methodology was used to produce approximations of the optimal solution. The proposed model and solution methodology were applied to a real case study on the distribution of Petroleum Products in northern Brazil. The results show that the methodology allows us to obtain solutions that are relatively close to the real optimal solution of the problem with optimality gaps estimated at up to 1%, which are reasonable for most practical purposes.
Shankar Narasimhan - One of the best experts on this subject based on the ideXlab platform.
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modeling and simulation of unloading operations in Petroleum Product storage terminals
Computers & Chemical Engineering, 2012Co-Authors: Arun S Srikanth, Sridharakumar Narasimhan, Shankar NarasimhanAbstract:Abstract Liquefied Petroleum Products such as propane, butane, LPG and LNG are transported by ships and stored in tanks in storage terminals. These Products are conveyed from the jetty by above-ground insulated pipelines to storage terminals that are typically situated 12–20 km inland. Unloading of Petroleum Products is energy intensive and results in excessive BOG (boil off gas) generation and pressure build up in the storage tank. In this work, a dynamic model of the unloading operation is developed to predict temperature dynamics of pipeline, pressure and inventory changes in the storage tank. This model consists of a lumped dynamic model for the storage tank coupled with a distributed parameter model for the pipeline. The model is validated using limited data collected from an operating plant during unloading of propane. Dynamic simulation results of the model are presented to indicate the trade-off that exists between the pre-cooling and unloading operating strategies.