per Hamedan University of Medical Sciences Journal of Occupational Hygiene Engineering 2383-336x 2383-3378 2018-01 4 4 1 11 article Gholamabas Shirali gshirali52@gmail.com 1 Mojtaba Nakhaei pour nakhaeimojtaba13@gmail.com 2 Fereshteh Jahani jahani.f71@gmail.com 3 Mahdi Shakib mehdi_kh2010@yahoo.com 4 Iman Mir imanmirr@yahoo.com 5 Associate Professor, Department of Occupational Health Engineering, School of Public Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran MSc in Occupational Health Engineering, Jundishapour University of Medical Sciences, Ahvaz, Iran MSc in Occupational Health Engineering, Jundishapour University of Medical Sciences, Ahvaz, Iran MSc in Industrial Management, Tehran University, Tehran, Iran MSc in Biostatistics, Jundishapour University of Medical Sciences, Ahvaz, Iran Background: incidents are one of the most important causes of damages in an organization. incidents, rarely, occure of a big mistakes ,they usually occur due to chain of Most minor and less important human or series errors. May each error, Have minor consequences But with combination their effects, sets or systems are moving invariably to the serious consequences and disastrous. Therefore, this study aimed to identify human errors leading to incidents in a gas refineries using Human Factors Analysis and Classification System. Methods: This study is a retrospective study that was performed in a gas refinery. incidents Data of this study be provided from gas refinery, first root causes analysis reports (RCA) of incidents that occurred during the last 8 years was prepared And then were analyzed by using the HFACS model. Results: the maximum error of HFACS viewpoint Related to the first level i.e errors caused by unsafe acts that in the first level was related to the "violations", in the second to the physical environment, in the third level to the inadequate supervision and in the fourth level to the management of resources have a Most repeated in mentioned levels Conclusion: The results of this study showed the causes of accidents and several weaknesses In refineries. It can be helped to reduce human error in the organization by utilization at the same time administrative controls and by creating an appropriate learning environment and raise employee awareness. http://johe.umsha.ac.ir/article-1-310-en.pdf Human error refinery gas Root Cause Analysis (RCA) HFACS per Hamedan University of Medical Sciences Journal of Occupational Hygiene Engineering 2383-336x 2383-3378 2018-01 4 4 12 19 article Davood Afshari davodafi@yahoo.com 1 Atefeh Siahi Ahangar Siahi2068@gmail.com 2 Sanaz Mohi Pour sanaz.mohi72@gmail.com 3 Kambiz Ahmadi angali angali-k@ajums.ac.ir 4 Simin Amirmoezi amirmoezi.s@gmail.com 5 Ahvaz Jundishapur University of Medical Sciences Ahvaz Jundishapur University of Medical Sciences Ahvaz Jundishapur University of Medical Sciences Ahvaz Jundishapur University of Medical Sciences Ahvaz Jundishapur University of Medical Sciences Introduction: Measurement of Maximum aerobic capacity (VO2-max) is important in physiologically fitting the workers to the job. The objective of this study was to investigate the effect of anthropometric and demographic factors on physical work capacity. Methods: Methods: In this study 60 students of Ahwaz University of Medical Sciences were selected voluntarily. A checklist consisted of two sections was used as data collecting tool. The first section included demographic characteristics. The second section included anthropometric characteristics of the students. Students aerobic capacity was assessed by ergometer according to Astrand protocol for 6 minutes. Linear regression analyses were performed to investigate association between demographic variables and VO2-max. Results: Students aerobic capacity was estimated to be 2.19  0.56 lit/min and 35.95  8.97 ml/kg. min. Statistical analysis revealed association between VO2-max with sex, weight, height, body fat percentage (p ≤0.01) and width of shoulders (p ≤0.04). Conclusion: Among the demographic factors showed that only sex and anthropometric dimensions weight, height, width of shoulders and body fat percentage were significantly associated with physical work capacity. Therefore, using the regression equations mentioned in this study, it is possible to estimate the physical work capacity according to the gender and anthropometrics dimensions. http://johe.umsha.ac.ir/article-1-324-en.pdf Physical Work Capacity Astrand Protocol Anthropometric Dimensions. per Hamedan University of Medical Sciences Journal of Occupational Hygiene Engineering 2383-336x 2383-3378 2018-01 4 4 20 30 article Elham Yahyaei elhamyahyaei@modares.ac.ir 1 Hasan Asilian asilia_h@modares.ac.ir 2 Ali Khavanin khavanin@modares.ac.ir 3 Backgrounds: Toluene is one of the most important pollutant in various industries such as petrochemical. Absorption of solvents on the substrate is an effective control method for volatile organic compounds. The purpose of this study was to determine the effect of silver nanoparticles on the absorption capacity of USY zeolite in the process of absorbing toluene vapors from the airflow. Methods: The Ag / USY catalyst composition was prepared using an impregnation method, and each of the adsorbents was placed in a quantity of 1 g inside a quartz glass cylinder with a length of 25 cm and an inner diameter of 10 mm .In order to maintain a dynamic flow of toluene vapors in reactor, impregnation method was used. Input and output toluene concentrations were measured using direct reading instruments. Effectiveness of absorbents was determined based on the Breaking point and adsorption capacity. Results: Toluene dynamic vapor with 40 ppm concentration and air flow rate of 0.5 L / min by 1 g of USY and Ag / USY adsorbent, containing 3.9% of silver nanoparticles, were fully absorbed in 465 and 873 minutes, after which the breaking point And gradually absorption decreased, so that it was saturated at 153 and 162 minutes, respectively, and the concentration of toluene vapors in the reactor outlet was equal to the initial value. Conclusion: The results of the study showed that Ag / USY adsorbent containing 3.9% of silver nanoparticles, had only a loss of time and higher absorption time than zeolite. http://johe.umsha.ac.ir/article-1-289-en.pdf USY zeolite silver nanoparticles toluene air purification per Hamedan University of Medical Sciences Journal of Occupational Hygiene Engineering 2383-336x 2383-3378 2018-01 4 4 31 38 article Hamidreza Heidari hr.heidari.tums@gmail.com 1 Hoda Rahimifard rahimifard.h@gmail.com 2 Shahram Arsang-Jang arsangjang@gmail.com 3 Robabeh Sahranavard sahranavardr@gmail.com 4 Ahmad Soltanzadeh soltanzadeh.ahmad@gmail.com 5 Assistant Professor, Occupational Hygiene Engineering Department and Research Center for Environmental Pollutants, Health Faculty, Qom University of Medical Science, Qom Occupational Health Specialist, Research Center for Environmental Pollutants, Health Faculty, Qom University of Medical Sciences, Qom, Iran Assistant Professor, Department of Epidemiology and Statistics, Health Faculty, Qom University of Medical Sciences, Qom, Iran Occupational Health Specialist, Research Center for Environmental Pollutants, Health Faculty, Qom University of Medical Sciences, Qom, Iran Assistant Professor, Occupational Hygiene Engineering Department and Research Center for Environmental Pollutants, Health Faculty, Qom University of Medical Science, Qom, Iran. Introduction: Thermal stress risk management requires the development of applied indicators. The purpose of this study was to evaluate the performance of the two indicators including WBGT and TWL and their fit with the tympanic temperature. Method: This cross-sectional study was carried out on 101 urban service personnel in a heat and dry area in 2016. The measurements of the study indices including WBGT, TWL, air velocity and tympanic temperature were performed using a WBGT Digital Thermometer, TWL software, thermal anemometer and Thermometer measuring the temperature of the tympanic curtain, respectively. Data were analyzed by SPSS software version 22. Results: The results of this study showed that the highest correlation was observed between WBGT index and tympanic temperature (r=0.669) and the lowest correlation coefficient was between TWL index and tympanic temperature (r=0.343). In addition, the absolute magnitude of the correlation coefficient between the WBGT and TWL indicators was higher in comparison with other indicators (r=0.660) and the correlation with the increase in air temperature was also higher, so that at temperatures above 35 ° C, the correlation coefficient of the two indices reached 0.996. Conclusion: The findings of this study indicated that the TWL index can be considered and applied as a suitable substitute for the WBGT index. http://johe.umsha.ac.ir/article-1-330-en.pdf Thermal stress Wet-bulb globe temperature (WBGT) thermal work limit (TWL) tympanic temperature per Hamedan University of Medical Sciences Journal of Occupational Hygiene Engineering 2383-336x 2383-3378 2018-01 4 4 39 46 article Mohammad Hajaghazadeh mohamad.5714.53@gmail.com 1 Abolfazl Ghahramani ghahramani.a@gmail.com 2 Mohamad Hajaghazadeh hajaghazadeh@gmail.com 3 MS Student of Ergonomics, Faculty of Health, Urmia University of Medical Sciences, Urmia, Iran Assistant Professor, Department of Occupational Health, Faculty of Health, Urmia University of Medical Sciences, Urmia, Iran Assistant Professor, Department of Occupational Health, Faculty of Health, Urmia University of Medical Sciences, Urmia, Iran Introduction: Repetitive movements and overexertion during occupational activities can lead to musculoskeletal disorders in the upper limbs. The aim of this study was to assess the ergonomic risk factors of the upper limb extremities using modified strain index (RSI) and threshold limit value for hand activity level (TLV-HAL) methods in hand-swen shoe workers in Tabriz city. Methods: The ergonomic exposure of 218 hand-swen shoe workers was assessed by RSI and TLV-HAL method in this cross-sectional study. Direct observation and videotaping of the work-cycles were used to calculate the study variables. Data were analyzed by descriptive and analytical methods such as one-way ANOVA, Spearman correlation, and Kappa statistics. Results: Two hundred and eighteen workers were recruited involved in three tasks including preparation (69), sewing (63) and shoemaking (86). The average score of RSI for sewing, preparation, and shoemaking  workers was 9.30, 46.10, 95.91, respectively while the average score of TLV-HAL for these tasks was 0.27, 0.81 and 1.70, respectively. Almost all workers in preparation and shoemaking tasks were categorized in the hazardous level of exposure while sewing workers were categorized in the safe exposure level. The scores of TLV-HAL had a significant and high correlation with the scores of RSI. Conclusion: According to the results, the workers in preparation and shoemaking tasks were at a higher risk of upper limbs musculoskeletal disorders due to repetitive actions and overexertion. Therefore, ergonomic interventions are suggested for these tasks to reduce the level of  these risk factors. http://johe.umsha.ac.ir/article-1-372-en.pdf Ergonomic assessment shoe repetitive action overexertion per Hamedan University of Medical Sciences Journal of Occupational Hygiene Engineering 2383-336x 2383-3378 2018-01 4 4 47 58 article Ehsan Jafarnia eh.jafarinia@gmail.com 1 Ahmad Soltanzadeh soltanzadeh.ahmad@gmail.com 2 Samira Ghiyasi samiraghiyasi@yahoo.com 3 MSc Student, Department of Health, Safety, and Environment, Faculty of Engineering, Islamic Azad University, Central Tehran Branch, Tehran, Iran Assistant Professor, Department of Occupational Hygiene Engineering, Faculty of Health, Research Center for Environmental Pollutants, Qom University of Medical Sciences, Qom, Iran Assistant Professor, Department of Environmental Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran Introduction: The necessity of risk management in construction projects in order to reduce accidents, achievement of the project goals, guaranteeing the survival of the organization and satisfying customers is inevitable. Therefore, attention to the risk management issue as apart of the risk macro topic in PMBOK can also play a significant role in identifying, assessing and controlling the HSE risks. Method: This study was designed and implemented in a cross-sectional descriptive-analytical study in 2016-2017 with the aim of analyzing 38 types of risk in four categories of HSE risk in a major macroeconomic project with the PMBOK standard approach. Basis of this combined risk assessment was determined the risk matrix including probability and severity factors. Results: The results showed that the HSE risk associated with the cost of construction projects was at a very high-risk level among the four groups of HSE risks in the WBS, project cost, quality and emergency conditions. Furthermore, the lack of allocation of costs to employment HSE supervisor, expert and officer according to project phases was assessed as the highest risk source. Conclusion: This study, with the evolution of approaching the project managers and HSE, providing a new approach to identifying major project risks, examining the different dimensions of the consequences of accidents in the project, and applying different areas of PMBOK standard in risk assessment, can be introduced as a suitable substitute for common risk assessment methods in this industry and similar industries. http://johe.umsha.ac.ir/article-1-364-en.pdf HSE risk assessment construction industry PMBOK per Hamedan University of Medical Sciences Journal of Occupational Hygiene Engineering 2383-336x 2383-3378 2018-01 4 4 59 69 article Mostafa Mirzaie Aliabadi mirzaie60@yahoo.com 1 Iraj Mohammadfam iraj_f@yahoo.com 2 Ahmadreza ahmadi gahar aahmadi.hse@Gmail.com 3 Introduction: Exploration and development of onshore oil and gas fields involve a number of risks related to loss of human lives, pollution, and loss of material assets. One of the major concerns in the oil and gas drilling industry are Blowouts. Blowout could have severe consequences, such as fire and explosion, releases of toxic gases and environmental disasters. The aim of this study is to identify  and analyze of basic events that lead to kick and blowout in drilling industry by using Bow tie Analysis and Bayesian network (BN), in exploration well of Iranian onshore drilling industry.  Methods: In this study, Fault Trees Analysis (FTA) investigates basic events of a kick while Event Tree Analysis (ETA) explores the possible consequences (including blowout) arising from a kick. The Bow Tie Analysis (BTA) combines FTA and ETA to represent the potential accident scenarios, their causes and the associated consequences of a kick. Finally BN is constructed to investigate the blowout probability and to determine the relationship and effectiveness of various blowout safety barriers in the well. Results: 24 basic event (root causes) have been identified for kick. Also to mitigate kick consequences, 7 safety barriers recognized. The probability of kick and blowout was calculated as 9× 10-2 and 3.5× 10-5 , respectively. The order of importance measure of each root causes also was listed.                                                                                                                          Conclusions: In this study, getting into the high pressure zone and decrease of bottom hole pressure (BHP), was identified as the most important root causes of kick. Furthermore, early detection of kick and the proper functioning of Blowout Preventer (BOP) were recognized as the first safety barrier to prevent the blowout. http://johe.umsha.ac.ir/article-1-369-en.pdf Blowout Kick Risk assessment Bow tie analysis (BTA) Bayesian network (BN). per Hamedan University of Medical Sciences Journal of Occupational Hygiene Engineering 2383-336x 2383-3378 2018-01 4 4 70 80 article Parvaneh Yarahmadi parvanehyarahmadi350@gmail.com 1 Soolmaz Dashti Soolmazdashti@iauahvaz.ac.ir 2 Gholam Reza Sabzghabaei grsabz1@gmail.com 3 Department of Environmental Management (HSE), Ahvaz Branch, Islamic Azad University, Ahvaz, Iran. Assistant Professor, Department of Environment, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran. Assistant Professor, Department of Environment, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran. Introduction: Performance evaluation and the determination of the effectiveness of a management system, including the HSE management system, is inevitable to achieve continuous improvement in organizations. Method and Materials: This research was conducted in order to evaluate and rank contractors for HSE performance using (AHP and TOPSIS) in the complex of Imam Khomeini port and Provision of management solutions to improve the HSE status of contractors in this complex. Results: For this purpose, after identifying 38 contractors, 4 criteria and 22 sub-criteria was determined by using Delphi technique then the criteria and sub criteria were weighed and prioritized by using the AHP method. The management criteria with weight 0.586 obtained the highest score and environmental criteria with weight 0.0085 obtained the lowest score. Also the sub criteria of the HSE professional staff with weight 0.272 obtained the highest and green space with weight 0.006 obtained the Lowest weight. Finally the Assessment and ranking of contractors were done in terms of HSE performance using the TOPSIS technique. The results showed that in terms of HSE performance T.GH.KH company with points 0.9452 ranked the first, A.N.A company with points 0.9367 ranked the second and G.A company with points 0.9264 ranked in the third place. Also, contractors based on performance HSE were ranked in three levels of good (9 contractors), moderate (22 contractors) and weak (7 contractors). Conclusion: According to the selected criteria, the performance of HSE management in the majority of contracting companies in a favorable situation and a number of companies was at a good and acceptable level. This desirable situation can be attributed to the establishment of HSE management system and the level of contractors' compliance with the HSE requirements. http://johe.umsha.ac.ir/article-1-325-en.pdf Ranking HSE Multi-criteria decision-making methods performance management Imam Khomeini port complex