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Mansouri H.,Islamic Azad University at Tehran | Alavi S.A.,Islamic Azad University at Tehran | Fotovat M.,South Pars Gas Complex Company
JOM | Year: 2015

The microbial corrosion behavior of three important steels (carbon steel, stainless steel, and Corten steel) was investigated in semi petroleum medium. This work was done in modified nutrient broth (2 g nutrient broth in 1 L oily wastewater) in the presence of Pseudomonas aeruginosa and mixed culture (as a biotic media) and an abiotic medium for 2 weeks. The behavior of corrosion was analyzed by spectrophotometric and electrochemical methods and at the end was confirmed by scanning electron microscopy. The results show that the degree of corrosion of Corten steel in mixed culture, unlike carbon steel and stainless steel, is less than P. aeruginosa inoculated medium because some bacteria affect Corten steel less than other steels. According to the experiments, carbon steel had less resistance than Corten steel and stainless steel. Furthermore, biofilm inhibits separated particles of those steels to spread to the medium; in other words, particles get trapped between biofilm and steel. © 2015, The Minerals, Metals & Materials Society. Source

Abbasi M.,Persian Gulf University | Farniaei M.,Shiraz University of Technology | Kabiri S.,Shiraz University | Rahimpour M.R.,Shiraz University | Abbasi S.,South Pars Gas Complex Company
International Journal of Chemical Reactor Engineering | Year: 2016

In this study, a steady-state heterogeneous one-dimensional model predicts the performance of a thermally double coupled auto-thermal multi-tubular reactor for simultaneous production of hydrogen, benzene, methanol and dimethyether (DME) in an economical approach for both co- and counter- current modes of operation. Reversed flow of cyclohexane has been considered for the counter-current flow regime. The simulation results for co- and counter-current modes have been investigated and compared with corresponding predictions for conventional methanol reactor and traditional coupled methanol reactor. In addition, various operating parameters along the reactor have been studied. The simulation results present that methanol yield in co- and counter- current modes are reached to 0.3735 and 0.3363 in a thermally double coupled reactor, respectively. Also, results for counter-current mode show a superior performance in hydrogen and benzene production. Finally, the results of simulation illustrate that the coupling of these reactions could be beneficial. © 2016 by De Gruyter 2016. Source

Bagheri M.,Tarbiat Modares University | Bagheri M.,South Pars Gas Complex Company | Alamdari A.,Islamic Azad University | Davoudi M.,South Pars Gas Complex Company
Journal of Natural Gas Science and Engineering | Year: 2016

Sour gas is more dangerous than sweet gas because of its hydrogen sulfide contents, so it requires more safety considerations. The safety aspects of long pipelines for transportation of sour gas have been always of concern because of the potential populated area, high pressure and presence of toxic compounds of pipelines. In this study, the risk assessment studies have been done for sour gas transport pipeline using a combination of CFD method and dose-response model. Three different release cases include small, medium and large size hole were studied and two different angles were considered for gas jet outlet, horizontal and 45° angle from the horizon. The individual risk was determined for ten points on the ground surface in the vicinity of pipeline with 10 m gap distance. Probability and fatality diagrams were obtained in each case. Results show individual risk can be neglected in the case 45° angle from the horizon. The value of risk at 10 m distance from the pipeline was approximately 3.2 times more than the risk value at 100 m distance. As a case study, a real gas transmission pipeline is investigated in the adjacent area which is categorized in accordance to its assigned individual risk. The case study is a sour gas transmission pipeline that is placed in south of Iran. In this study, minimum individual risk of 8.27537 E-06 (yr-1) is determined at 100 m distance to pipeline, so it can be concluded that for this pipeline, safe distance is more than 100 m. © 2016 Elsevier B.V. Source

Davoudi M.,South Pars Gas Complex Company | Davoudi M.,Shiraz University | Safadoust A.R.,South Pars Gas Complex Company | Akbar Mansoori S.A.,South Pars Gas Complex Company | Mottaghi H.R.,South Pars Gas Complex Company
Journal of Natural Gas Science and Engineering | Year: 2014

Large amount of thermal degraded products, heat stable salts, oxygen and CO2 presence in amine solution, is the main causes of corrosion problems in the gas processing plant. Recent inspection of the gas sweetening process equipment showed that significant corrosion has occurred in the bottom sections of the rich amine regenerators and reboilers as well as the piping connecting the reboilers and the regenerators. Corrosion resulted in a leak in the vapor return line from the reboiler to regenerator. The object of the present investigation is (a) to focus on the Different impurity in amine cycle and insights that have been gained from observations of sour gas sweetening processes in South Pars gas processing plant (b) to discuss the effect of impurities on the thermal degradation and corrosivity of amine solution, (c) to analyze some of the volatile degradation products by mass spectrometry and (d) from the available experimental evidence suggest a corrosion prevention method. © 2014 Elsevier B.V. Source

Davoudi M.,Shiraz University | Davoudi M.,South Pars Gas Complex Company | Heidari Y.,South Pars Gas Complex Company | Mansoori S.A.A.,South Pars Gas Complex Company
Journal of Natural Gas Science and Engineering | Year: 2014

Multi-phase flow is experienced in many instances of the oil and gas industry. There is multi-phase flow in the sea lines, transferring the production from the South Pars offshore platforms to the receiving onshore facilities. By pigging at frequent intervals, liquid inventory buildup in a sea pipeline and the maximum slug size can be reduced. Uncontrolled speed of a pig can cause to large liquid slugging formation and bursting of pipeline due to pig stuck. In June 2008 the slug catcher levels increased unexpectedly to 100-105%. The main objective of this study is composed of calculation for liquid holdup, pig velocity, amount of slug during pigging operation and the influence of the production flow rate during the pigging of South Pars sea lines that is located in south of Iran. Besides the slug catcher liquid level, some parameters such as liquid bottle level were measured during pigging time process. The comparison between the actual and simulated sea line glycol holdup, travel time for the pig, sea line inlet pressure and the liquid slug volume has been done in this work. The difference between the actual and simulated travel time for the pig was 0.7 and 1.3h for 600 and 300 million standard cubic feet per day (MMSCFD) of the gas flow rate. The absolute average relative errors of condensate and water slug volume are 5.6% and 9.1% respectively, which are very satisfactory. The results showed that the optimum gas flow should be around 500 MMSCFD to handle the slug volume and running the pigs is most effective at a near constant speed. © 2014 Elsevier B.V. Source

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