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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.

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.

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.

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.

Sarkari M.,South Pars Gas Complex Company | Sarkari M.,Brigham Young University | Fazlollahi F.,Brigham Young University | Atashi H.,University of Sistan and Baluchestan | And 2 more authors.
Chemical and Biochemical Engineering Quarterly | Year: 2013

Three Fe-Mn/Al2O3 catalysts were prepared by three different preparation techniques, i.e. co-precipitation; sol-gel and impregnation, and their Fischer-Tropsch Synthesis (FTS) activity and selectivity behavior were investigated and compared using a fixedbed reactor. It was observed that the impregnated catalyst had the lowest initial activity but was more stable than the other catalysts. The co-precipitated and sol-gel catalysts showed enhanced light olefin production as compared with the impregnated. Methane selectivity decreased with time on stream for both the impregnated and co-precipitated catalysts while it increased for the sol-gel. The impregnated catalyst showed the lowest WGS activity, the highest hydrocarbon selectivity and the highest chain growth probability.

Safadoost A.,South Pars Gas Complex Company | Davoodi M.,South Pars Gas Complex Company | Mansoori S.A.A.,South Pars Gas Complex Company
Journal of Natural Gas Science and Engineering | Year: 2014

In each sour gas processing plant, the sulfur recovery unit is one of the most important processes regarding environmental aspects, since improper performance of this unit can impose critical problems on the environment. Gas containing H2S is sent to a sulfur recovery unit to recover the sulfur and avoid venting H2S to the atmosphere. Corrosion is a major concern in the sulfur recovery process due to the presence of a high percentage of hydrogen sulfide, as well as high temperatures in most of the unit's equipment. The leaking tubes were found in the bottom of the low-pressure steam condenser. A set of operational parameters such as H2S, CO2, and hydrocarbon concentration, reaction furnace temperature, process configuration, cold or hot bypass need to demonstrate the cause of the corrosion issues encountered in the sulfur recovery condenser. The main objective of this paper is to thoroughly investigation about root cause analysis of corrosion problem that is occur in sulfur recovery from a gas processing plant located in south of Iran. Moreover, it will propose protective actions to avoid reoccurrence of corrosion problems. This paper will review potential corrosion mechanisms and operational data which illustrate the importance of warm up and cool down during startup and shutdown procedure and also bad operation. © 2014 Elsevier B.V.

Davoudi M.,South Pars Gas Complex Company | Aleghafouri A.,South Pars Gas Complex Company | Aleghafouri A.,University of Kashan | Safadoost A.,South Pars Gas Complex Company
Journal of Natural Gas Science and Engineering | Year: 2014

In the oil and gas industry, flaring is considered to be a safe and reliable method for disposal of residual gas or depressurization of a fire zone. The classification of process and utilities units in different fire zones is a basis for the evaluation of the flare sizing load because of depressurization events in a gas refinery. Present paper focuses on flaring network in five gas processing plants of South Pars with different fire zone classification. The maximum flaring loads are calculated and reported for these refineries. Results show that the different flare sizing load is due to different fire zone arrangement. In addition, three case studies in relative flaring networks such as fuel gas consumption in second refinery, hydraulic calculation of flare header in third refinery and flare radiation in second refinery are surveyed. The adjustment of fuel gas consumption was conducted after the flare network back pressure which has been calculated in second refinery by a Flare Net simulator. Moreover, the sizes of sub-header/header HP flare in third refinery is established based on Flare Net simulation, and PHAST simulation results are rejected the installation of a DMC unit in second refinery because of radiation limits. © 2014 Elsevier B.V.

Davoudi M.,South Pars Gas Complex Company | Samieirad S.,South Pars Gas Complex Company | Mottaghi H.R.,South Pars Gas Complex Company | Safadoost A.R.,South Pars Gas Complex Company
Journal of Natural Gas Science and Engineering | Year: 2014

This study was carried out during 2012-2013 at South Pars Gas processing plants, which is located in Assaluyeh city, southern part of Iran. The project involves the sources of wastewater pollutants in oily wastewater process and collects samples for analysis. The parameters that affect the environmental pollution are BOD (Biological Oxygen Demand), COD (Chemical Oxygen Demand), pH, TSS (Total Suspended Solid), Mono Ethylene Glycol (MEG) and hydrocarbon which are determined in oily wastewater. The goal of this research is to show source reduction through process modification is a viable technique to minimize process waste. To accomplish this objective some operational and technical suggestions were presented to improve the current process at South Pars Gas processing plant. These recommendations would play a major role in the advancement and optimization of the wastewater treatment process. For wastewater disposal to surface water, Iranian National Standard limitations are applied. Our study demonstrates that COD concentration of effluent streams of API and Induced Gas Floatators (IGF) (oily water treatment sections) is above the standard level and tends to fluctuate. Hence, alternative modification and treatment processes such as biological and advanced oxidation process have been applied for increasing recovery and improving COD removal from wastewater. © 2014 Elsevier B.V.

Davoudi M.,South Pars Gas Complex Company | Mottaghi H.R.,South Pars Gas Complex Company | Samieirad S.,South Pars Gas Complex Company | Heidari Y.,South Pars Gas Complex Company
Journal of Natural Gas Science and Engineering | Year: 2014

Improper or inadequate treatment, handling, and disposal of sanitary wastewater can have far reaching impacts on the environment. These impacts are the reasons for management and regulation of South Pars Gas processing plants. Foaming, high suspended solids, high biodegradable material and low pH are the main causes of pollution problems in the sanitary wastewater treatment (activated sludge process) of a gas processing plant. Recent inspection of the sanitary treatment package showed that significant foaming has occurred in inlet Sump and aeration Tank of the unit as well as increasing BOD (biochemical oxygen demand) of effluent stream. The object of the present investigation is (a) to focus on the performance assessment of activated sludge process and potential reasons of pollution that have been gained from observations and laboratory results in South Pars Gas processing plant (b) to discuss the effects of these reasons on the specification of effluent wastewater, (c) to analyze operational management and modification of current activated sludge system and (d) from the results suggest some techniques for pollution control in the plant. © 2014 Elsevier B.V.

Jamshidi B.,South Pars Gas Complex Company | Sarkari M.,South Pars Gas Complex Company
Journal of Natural Gas Science and Engineering | Year: 2016

Pigging is mainly done for cleaning the deposits and liquid removal in order to reduce the overall pressure drop and increase the pipeline flow efficiency. In this study, a simplified pigging model in two-phase flow pipelines with 657 mm diameter and 108 km length sea line of South Pars located in south of Iran has been developed to predict the pigging operation. At the beginning, the steady state condition was modelled to find the initial values, then the transient state cause to variable of feed flow rate was modelled, and finally the transient model was coupled with pigging model to describe the pig behaviour based on three flowing zones. The one dimensional differential equations and explicit finite difference were used as solution method. The results obtained with the code were compared with OLGA simulation and three real field pigging displacement and there was good agreement between them, thereby validating the method. © 2016 Elsevier B.V.

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