Journal of Occupational

  Background: Rug weaving is an important source of income in rural areas of Kerman and hand woven rugs are considered as the most important non-petroleum export of Iran. In this study, we describe the working environment as well as the occupational risk factors of these rug weavers.

  Materials and Methods: This study was performed in the Golzar region including Shirinak, Chartagh and Babe Shamil villages. The workplaces were identified and the hazards of each workshop were determined using the study checklist. The workers were also screened for medical conditions.

  Results: The average age of the workers was 29 years. The work place evaluation showed that the floor, wall, ceiling, light, temperature and general condition of most of the workplaces was inappropriate and non-standard, and needed major changes. The average working hours were 9.1 hours a day. Medical problems such as visual disturbances, musculoskeletal problems, psychological disorders, gynecological disorders, goiter and tightness of breath were discovered in the workers.

Conclusion: Many rug weavers still work in improper conditions, and need occupational health knowledge and financial support to improve the physical characteristics of their workplaces and prevent debilitating disorders

 Background: The aim of this paper was the comparison of ergonomic risk assessment results (final score and action levels) for the entire body as determined using Quick Exposure Check (QEC) and Rapid Entire Body Assessment (REBA).

 Materials and Methods: This was a cross-sectional study in which all 82 workers engaged in various processes with different activities in an anodizing and aluminum profiles producing industry in Tehran, Iran, were studied. The REBA and QEC ergonomic risk assessment techniques and Nordic Musculoskeletal Questionnaire (NMQ) were used in order to assess the correlation between results of the two methods and evaluate the correlation between the prevalence of musculoskeletal disorders and the results of these two methods.

 Results: Studied postures, using QEC and REBA assessment methods, acquired the risk levels, respectively, of low risk = 10.9%, moderate risk = 25.5%, and high/very high risk = 63.6% in QEC. They obtained the risk levels of low risk = 56.3%, moderate risk = 40%, and high/very high risk = 12.7%, respectively, in REBA. The kappa (0.12) and gamma scores (0.51) showed no agreement between the outputs of the two tools. No significant correlation (P > 0.05) was found between final scores of these two methods and prevalence of musculoskeletal disorders.

  Conclusions: These results indicate that the risk assessment outcomes of these two ergonomic assessment tools for the entire body do not agree. Thus, there is no possibility of applying them interchangeably for postural risk assessment, at least not in this industry.

  Background: In the refractory brick manufacturing industry, because of the high risks associated with the level of dust in the factory environment and thermal stress, a precise identification of industrial hazards is required as a part of safety analysis. The aim of this study was to introduce a preventive approach to risk identification and assessment in the refractory brick production line.

  Materials and Methods: In this paper, methods such as observation of factory operations, process analysis through the factory diagrams, and interviews with employees were used. In addition, the risk levels of the factory were investigated using the risk matrix.

  Results: The results of the study showed 97 deviations from the main process with various causes and consequences. None of the deviations were in the unacceptable category with 3.09% falling in the undesirable category, 3.09% in the acceptable but in need of revision category, and 92.78% in the acceptable category.

  Conclusions: The results showed that 40.2% of the risks were caused by human errors. The installation of a secondary control valve in the transfer route of the glue vapors to the workplace, an alternative pressure control system, a secondary ventilation system, several fans near the furnace (redundancy), and a real-time phenol monitor are recommended. Moreover, regular analysis of safety, health, and environmental risks are some of the recommendations proposed to reduce the identified risk level.

Background: Chemical contaminants present in the work environments include gases, vapors, and solid and liquid suspended particles. The number of factories producing chemicals has increased significantly. Each year, new products are introduced into the market. Consequently, the number of employees at risk of exposure to these materials is increased. Hazardous chemicals are used in the petrochemical industry that is one of the major industries in the country's economic development. Therefore, the aim of this study was a semi-quantitative risk assessment of health exposure to hazardous chemical agents in a petrochemical plant.

Materials and Methods: This was a descriptive analytical study for assessing the sanitary risks of hazardous chemical factors in the work environment through a risk assessment method provided by the Occupational Health Department of Singapore. Thus, initially, occupational tasks and processes were determined. Subsequently, all hazardous chemical factors were detected, and then, the degree of risk, the degree of exposure, and risk rating were determined.

Results: In total, 24 tasks were examined and risk assessment was performed for 19 hazardous chemical substances in this study. Among these materials, benzene and xylene had the highest risks and were used in various occupations. In this study, mean and standard deviation of age and experience of participants were 30.28 ± 7.87 and 5.98 ± 5.66, respectively. Moreover, 25.3% of participants in this study were single and 74.7% were married.

Conclusions: It can be concluded that 81% of chemicals used in this industry are rated at moderate and high risk. In order to control the identified risks, this study recommended programs and control measures based on the hierarchy of elimination, substitution, engineering controls, administrative controls, and use of personal protective equipment.

Background: One of the challenges in construction is the occurrence of numerous accidents. In this regard, risk assessment can play an important role in reducing accidents. The aim of this study was to prepare comprehensive and quantitative checklists to determine the potential hazards in the construction phase.

Materials and Methods: The present descriptive and analytical study was carried out on petrochemical projects in the south of Iran in 2014. After the inspection of more than 50 construction projects, two types of technical and managerial checklists were designed. The managerial and technical checklists were designed with seven and 32 major subjects, respectively. Finally prepared checklist and ET&BA method were compared in term of their risk identification capability.

Results: The checklist and ET&BA methods, respectively, identified 300, 75, 125, and 48, and 107, 25, 12, and 0 risks related to hardware, design, mismanagement, and human error.

Conclusions: The checklist method can identify and assess human errors, while the ET&BA method cannot. Moreover, this method was more efficient than the ET&BA technique in identification and assessment of hardware-related, design-related, and managerial risks. Moreover, the duration and cost of implementation of checklist method were significantly lower than ET&BA method. This technique can be introduced as a quantitative risk assessment method in construction phases of projects and its weaknesses can be improved by future studies.

Background: The reliability and safety of gas refineries are strongly associated with the reliability of other parts of the system. Defect and failure in one part of a system can cause total system breakdown or accident. The failure and damage in these equipment such as transformers and boilers results in not only the equipment damage and human injuries but also productivity reduction. The purpose of this study was safety assessment of glycol recovery unit in gas refinery by failure mode and effects analysis (FMEA) technique.

Materials and Methods: The present study is a descriptive-analytical study done for risk assessment of glycol recovery unit of a gas refinery in one of the southern areas of Iran. FMEA method was used to identify and detect possible failures in the system. Failure modes of a component and their causes were identified and effects of identified failures were examined, then the necessary corrective measures were recommended.

Results: In this research, 105 failure modes were studied. The highest risk priority number (RPN) values obtained were 150 (while removing corrosion and welding inside TK601A/B vessel which was due lack of air ventilation) and 120 (while installing the gasket).

Conclusions: FMEA technique is a useful method to prevent accidents and increase safety and productivity. FMEA can identify and assess potential risks and propose corrective action required to control the risks.

Background: The use of chemicals is essential in education resulting in exposure to these pollutant in a variety of chemical and research laboratories. Chemical contaminants in chemical laboratories are in different forms and chemical exposure risk assessment is important for choosing appropriate controls in protecting the health of operators, experts and students. For risk assessment in chemical exposures, several techniques were introduced that their use should be assessed. This research was done with the aim to introduce the most appropriate technique in chemical risk assessment by using three chemical risk assessment techniques.

Materials and Methods: This was a descriptive research done in one chemical laboratory. This research had been defined in several stages: in the first phase, the list of solid and liquid chemicals were prepared and full physicochemical properties of substances as well as toxicity and health risk of them were collected. Finally Chemical Risk Management Self-Assessment Model (Chem-SAM), University Of Wollingong (UOW) risk assessment and semi-quantitative risk assessment method (SQRA) methods were used and compared.

Results: There was significant difference between SQRA methods and UOW technique while no significant difference was observed between SQRA methods and Chem-SAM model.

Conclusions: All three techniques are simple, but the results were similar in SQRA methods and Chem-SAM model, so these two methods can be replaced in chemical risk assessment. In order to control the identified risks, this research has recommended programs, control measures, improving local exhaust ventilation systems, personal protective equipment and training of personnel.

Background: Gas refining is a process in which workers are exposed to different chemicals. This study aimed to assess the health risks caused by exposure to these substances in order to determine hazardous jobs and to present controlling methods.

Materials and Methods: This cross-sectional study was performed on the workers at gas refinery in 2015. The sample included all the staff in operational parts and the selection was by census. To determine the risk of exposure to chemical pollutants, the method proposed by the Department of Occupational Safety and Health of Malaysia was used. Following this procedure, first the materials and processes were identified. Afterwards, risk and exposure rates were calculated. Using these two rates and risk rate formulas for individual chemicals, the exposure was calculated.

Results: The results showed that employees were exposed to 103 different types of chemicals that collectively were causing 162 types of exposure in different jobs. Of the total exposures, 5 percent were evaluated as “inconsiderable risk rate”, 51 percent as low, 30 percent average, 13 percent high, and 1.2 percent as “very high risk rate”.

Conclusions: The highest risk rate of exposure to chemicals in the refinery was related to benzene in stabilizer and topping area shift works (RR = 5) as well as the shift works in feller area and evaporation pools with risk rate of 5, ranking their risk as very high, indicating that corrective actions should start on this hazardous and carcinogenic chemical as soon as possible.