The Experts below are selected from a list of 1419 Experts worldwide ranked by ideXlab platform
Michael J. Ellenbecker - One of the best experts on this subject based on the ideXlab platform.
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Reducing Silica and Dust Exposures in Construction During Use of Powered Concrete-Cutting Hand Tools: Efficacy of Local Exhaust Ventilation on Hammer Drills
Journal of Occupational and Environmental Hygiene, 2008Co-Authors: Susan Shepherd, Susan Woskie, Christina A. Holcroft, Michael J. EllenbeckerAbstract:Concrete cutting in construction is a major source of exposure to respirable crystalline silica. To reduce exposures, Local Exhaust Ventilation (LEV) may be integrated into the hand tools used in concrete cutting. Volunteers from the New England Laborers Training Center participated in a field study focused on the use of LEV on concrete-cutting hammer drills. A randomized block design field experiment employing four workers measured the efficacy of four hood-vacuum source combinations compared with no LEV in reducing dust and silica exposures. Using four-stage personal cascade impactors (Marple 294) to measure dust exposure, a total of 18 personal samples were collected. Reductions of over 80% in all three biologically relevant size fractions of dust (inhalable, thoracic, and respirable) were obtained by using any combination of hood and vacuum source. This study found that respirable dust concentrations were reduced from 3.77 mg/m3 to a range of 0.242 to 0.370 mg/m3; thoracic dust concentrations from 12....
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articles effective Local Exhaust Ventilation on cooking fumes of seasoned meats
BKESS, 1998Co-Authors: Byeong Kyu Lee, Michael J. EllenbeckerAbstract:This study identified the fumes produced from the cooking of the seasoned meats containing various condiments such as garlic, onion, pepper, soy sauce, and sesame oil. Concentrations, at the breathing zone of the cook, of volatile organic compounds (VOCs) and aldehydes included in the cooking fumes of seasoned meats were identified. Many chloro-and fluoro-aliphatic hydrocarbons, aromatic hydrocarbons, ketones, and aldehydes, which could be carcinogen suspecting chemicals, were producing from the cooking fumes of the seasoned meats. This study also identified the Ventilation efficiencies of the cooking fumes of the six Exhaust Ventilation systems, which were widely being used in the general apartments, houses, and small-food factories. For a comparison of the Ventilation efficiencies of the systems, acetaldehyde was chosen as a marker pollutant and its concentrations at the breathing zone of the cook were identified. The laboratory fume hood showed the best Ventilation efficiency of the six Ventilation systems studied, and then the lateral hood Ventilation and the down draft Ventilation followed the laboratory fume hood. Finally, this study identified that both a wall factor nearby pollutant sources and a distance factor between the hood face and pollutant sources should be also considered for an effective Local Exhaust Ventilation system design.
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effective Local Exhaust Ventilation on cooking fumes of seasoned meats
Journal of Environmental Sciences-china, 1993Co-Authors: Byeong Kyu Lee, Michael J. EllenbeckerAbstract:This study identified the fumes produced from the cooking of the seasoned meats containing various condiments such as garlic, onion, pepper, soy sauce, and sesame oil. Concentrations, at the breathing zone of the cook, of volatile organic compounds (VOCs) and aldehydes included in the cooking fumes of seasoned meats were identified. Many chloro- and fluoro-aliphatic hydrocarbons, aromatic hydrocarbons, ketones, and aldehydes, which could be carcinogen suspecting chemicals, were producing from the cooking fumes of the seasoned meats. This study also identified the Ventilation efficiencies of the cooking fumes of the six Exhaust Ventilation systems, which were widely being used in the general apartments, houses, and small-food factories. For a comparison of the Ventilation efficiencies of the systems, acetaldehyde was chosen as a marker pollutant and its concentrations at the breathing zone of the cook were identified. The laboratory fume hood showed the best Ventilation efficiency of the six Ventilation systems studied, and then the lateral hood Ventilation and the down draft Ventilation followed the laboratory fume hood. Finally, this study identified that both a wall factor nearby pollutant sources and a distance factor between the hood face and pollutant sources should be also considered for an effective Local Exhaust Ventilation system design.
Pam Susi - One of the best experts on this subject based on the ideXlab platform.
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The power of Local action in occupational health: the adoption of Local Exhaust Ventilation in the Chicago tuckpointing trade
International Journal of Occupational and Environmental Health, 2016Co-Authors: Marc Weinstein, Pam Susi, Mark GoldbergAbstract:Background: Silica is a pervasive and potentially deadly occupational hazard in construction. The occupational risk posed by silica has long been known, but efforts to use engineering controls to minimize dust generation in tuckpointing operations, a masonry restoration specialty, have been slow.Objectives: The objective of this study is to explore how Local innovation in occupational safety and health may emerge, absent the establishment of national standards.Method:This study uses a case study to explore the adoption of Local Exhaust Ventilation in tuckpointing operations in the Chicago area. Sources of data for this research include interviews with a diverse range of key informants and the review of archival material.Results: This case study found Local unions, municipal regulators, contractors, and major public users of construction services played a central role in the events and milestones that led to the early adoption of Local Exhaust Ventilation in Chicago. The adoption of Local Exhaust ventilati...
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Local Exhaust Ventilation for the control of welding fumes in the construction industry a literature review
Annals of Occupational Hygiene, 2012Co-Authors: Michael R. Flynn, Pam SusiAbstract:Arc welding is a common unit operation in the construction industry, where frequent changes in location and welding position make it more difficult to control fume exposures than in industries where fixed locations are the norm. Welders may be exposed to a variety of toxic airborne contaminants including manganese (Mn) and hexavalent chromium (CrVI). Local Exhaust Ventilation (LEV) is a well-known engineering control for welding fumes but has not been adopted widely in the construction industry. This literature review presents data on the performance of a variety of LEV systems for welding fume control from the construction (five references), shipyard (five references), and other industries. The studies indicate that LEV can reduce fume exposures to total particulate, Mn, and CrVI to levels below currently relevant standards. Field studies suggest that 40-50% or more reduction in exposure is possible with portable or fixed LEV systems relative to natural Ventilation but that correct positioning of the hood and adequate Exhaust flow rates are essential. Successful implementation of extraction guns for gas metal arc welding (GMAW) and flux core arc welding has been demonstrated, indicating that a successful balance between extraction airflow and shielding gas requirements is possible. Work practices are an important part of achieving successful control of fume exposures; in particular, positioning the hood close to the arc, checking Exhaust flow rates, and avoiding the plume. Further research is needed on hood size effects for controlling welding fume with portable LEV systems and identifying and overcoming barriers to LEV use in construction.
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Local Exhaust Ventilation for the Control of Welding Fumes in the Construction Industry—A Literature Review
Annals of Occupational Hygiene, 2012Co-Authors: Michael R. Flynn, Pam SusiAbstract:Arc welding is a common unit operation in the construction industry, where frequent changes in location and welding position make it more difficult to control fume exposures than in industries where fixed locations are the norm. Welders may be exposed to a variety of toxic airborne contaminants including manganese (Mn) and hexavalent chromium (CrVI). Local Exhaust Ventilation (LEV) is a well-known engineering control for welding fumes but has not been adopted widely in the construction industry. This literature review presents data on the performance of a variety of LEV systems for welding fume control from the construction (five references), shipyard (five references), and other industries. The studies indicate that LEV can reduce fume exposures to total particulate, Mn, and CrVI to levels below currently relevant standards. Field studies suggest that 40-50% or more reduction in exposure is possible with portable or fixed LEV systems relative to natural Ventilation but that correct positioning of the hood and adequate Exhaust flow rates are essential. Successful implementation of extraction guns for gas metal arc welding (GMAW) and flux core arc welding has been demonstrated, indicating that a successful balance between extraction airflow and shielding gas requirements is possible. Work practices are an important part of achieving successful control of fume exposures; in particular, positioning the hood close to the arc, checking Exhaust flow rates, and avoiding the plume. Further research is needed on hood size effects for controlling welding fume with portable LEV systems and identifying and overcoming barriers to LEV use in construction.
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Manganese, Iron, and Total Particulate Exposures to Welders
Journal of Occupational and Environmental Hygiene, 2009Co-Authors: Michael R. Flynn, Pam SusiAbstract:Welders are exposed to a variety of metal fumes, including manganese, that may elevate the risk for neurological disease. This study examines several large data sets to characterize manganese, iron, and total particulate mass exposures resulting from welding operations. The data sets contained covariates for a variety of exposure modifiers, including the presence of Ventilation, the degree of confinement, and the location of the personal sampler (i.e., behind or in front of the welding helmet). The analysis suggests that exposures to manganese are frequently at or above the current ACGIH® threshold limit value of 0.2 mg/m3. In addition, there is evidence that Local Exhaust Ventilation can control the exposures to manganese and total fume but that mechanical Ventilation may not. The data suggest that higher exposures are associated with a greater degree of enclosure, particularly when Local Exhaust Ventilation is absent. Samples taken behind the helmet were, in general, lower than those measured outside of...
Abdul Mutalib Leman - One of the best experts on this subject based on the ideXlab platform.
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Validate of Local Exhaust Ventilation (LEV) Performance through Analytical, Experimental and Computational Fluid Dynamic (CFD): A Case Study Model
Applied Mechanics and Materials, 2014Co-Authors: Nor Halim Hasan, Abdul Mutalib Leman, Radzai Said, Norzelawati AsmuinAbstract:Local Exhaust Ventilation (LEV) system are a tools in engineering control stated in Occupational safety and health management system where to protect a workers from inhale the contaminant that will effected to their breathing system. To design, construct and applications of LEV are followed an international guidance such as American Conference of Governmental Industrial Hygienist (ACGIH).A sample two inlet and outlet of LEV system are design based on ACGIH including hood, ducting branch, main ducting, elbow, y-tee, fan and stack. The design is based on ACGIH standard with assuming the contaminant are fumes with 2 inlet of 6 inches round duct and outlet is 8 inches round type. The result from calculation according to the size of branch duct size, main duct size, fan capacity and stack size. Other data contribute are velocity and pressure drop along the duct.LEV system are design by using Solid Work Software and export file to Ansys 14.0, where the simulation are used to compare the result of velocity and differentials of pressure before proceeds to construct the system as additional in design process as follow in ACGIH Standard. Finally result of this study indicated that no significant different of the result of velocity along the ducting between design, experimental and compare with the simulation results.Where the analysis shows different compare with analytical almost below 30% and further study on comparative different of static pressure should carry out.
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The Efficacy of Local Exhaust Ventilation (LEV) System Controls on Aerosols Exposures during Aluminium Cans Production
Applied Mechanics and Materials, 2013Co-Authors: B. Norerama D. Pagukuman, Abdul Mutalib Leman, M. Z. M. YusofAbstract:The performance of a commercially available Local Exhaust Ventilation (LEV) system for controlling mist, vapor and fume exposures during two-piece slim retractable aluminium can production line was assessed. This study focused on monitoring of LEV system performance in different phases of production which are drawing and wall ironing. Data such as static pressure, velocity pressure, transport velocity and flow rate values was obtained as a specific requirement to analyze the performance of the system. The first LEV system used to control mist exposure from drawing activities and the second system was implemented to control fume and vapor during ironing wall process. The performance of the system was investigated and compared with standard as required by USECHH Regulation 2000. The results of LEV system monitoring were discussed and several recommendations were proposed to improve the performance of the system and to reduce the mist, fume and vapor exposure for occupational safety and health purposes.
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Baseline Inspection and Measurement of Local Exhaust Ventilation (LEV) Systems at Spray Booth in Manufacturing Plant
Journal of Selcuk University Natural and Applied Science, 2013Co-Authors: M. R Said, Nor Halim Hasan, Abdul Mutalib Leman, Majahar Abd RahmanAbstract:Examination and testing of Local Exhaust Ventilation systems (LEV) that was conducted could help the management to create base or annual performance measurement in industry operations.The LEV will also be verified compliance with original design data, in order to determine adequate of transport velocities are being maintained. The examination also to determine if additional Exhaust hoods can be added to the existing systems and compliance with Occupational Safety and Health (OSH) regulations.This Examination is to obtain the necessary data such as airflow static pressure, speed and total pressure at appropriate points LEV system. The method used is to inspect, analyze and evaluate the performance of Local Exhaust Ventilation systems and related components, evaluate and recommend necessary measures for the restoration or repair of the damage.LEV also need to carry out inspection and tested by a registered professional engineer after construction and installation to demonstrate that the equipment meets the design specifications.Methodology for measurement and testing were based on American Conference of Governmental Industrial Hygienist (ACGIH). Selections of testing points for fume hood and canopy hood with individual suction fan, face velocities were measured and where applicable and accessible, duct transport velocities and static pressure measurements were carried out. Results from measurement data obtained is 65 fpm face velocity and flow rate 6500 fpm is lower than the value proposed by the ACGIH and show spray booth is not able to bring out the contaminants out of the workplace. The LEV systems has been examined and tested; both spray booth number1 and number 2 was below the ACGIH Standard while measurement and inspections conducted and not comply with Local legislation to protect workers safety and health.
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The Performance Test on Local Exhaust Ventilation (LEV) System to Prevent Chlorine Gas Leakage in Water Treatment Plant
International journal of environmental science and development, 2013Co-Authors: Nor Halim Hasan, M. R Said, Abdul Mutalib Leman, Anuar Mohd MokhtarAbstract:Water is a necessity of life to humans and animals. In Malaysia, Government Link Companies (GLC) or Private Companies manages most of the water treatment plants. Chlorine gas is used as one of the water treatment media to treat raw water that will then be distributed for public or commercial usage. The large volume of Chlorine gases used and stored in these treatment plants has the potential to create a disaster if it leaks. Objective of this paper to highlight a result of Local Exhaust Ventilation (LEV) monitoring system and their performance test in controlling of air flow from the chlorine gas building to prevent leakage and spread to the surrounding environment. Methodology used follows the American Governmental Industrial Hygienist (ACGIH). The Chlorine Gas leakage system is checked and verified by using ACGIH Standard. Finally as a result, all the measured parameters (velocity, flow rate, face velocity and brake horse power (bhp)) show that the measurement and monitoring system of LEV are complied with ACGIH Standard and Local Law and Regulations
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Data Comparison on Fumes Local Exhaust Ventilation: Examination and Testing Compliance to USECHH Regulation 2000
2012Co-Authors: Nor Halim Hasan, Abdul Mutalib Leman, Mohd Radzai Said, B. Norerama D. Pagukuman, Jaafar OthmanAbstract:The paper focused on the examination and testing of Local Exhaust Ventilation (LEV) systems at one of Electrical Company to check the transport velocity whether it meet the recommended American Governmental Industrial Hygienist (ACGIH) Standard. The industrial hygiene approaches, AREC (Anticipating, Recognize, Evaluate and Control) were adopted in this study. This is to ensure that the LEV system installed has the optimum efficiency to extract out the contaminants from the workstation. Objective of this study is to make comparison with previous and current monitoring data. The efficiency and the other parameter measured will be the main source to analyze for the particular applications. The differential of data was discussed and several recommendations are proposed to make sure the LEV system performance is excellent.
Nor Halim Hasan - One of the best experts on this subject based on the ideXlab platform.
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Development Of Performance Standard For Circular Ducting Local Exhaust Ventilation System At Workplace
2016Co-Authors: Nor Halim HasanAbstract:Engineering controls, such as Local Exhaust Ventilation (LEV) system, are functioned to remove contaminants from work place, as it is vital that the level of contaminants must comply with legislation. Furthermore, LEV in industries has been designed, fabricated, and monitored to perform better in accordance to the American Conference for Governmental Industrial Hygienists (ACGIH) standard and the Guideline on LEV provided by Department of Occupational Safety and Health (DOSH). This study on LEV had been depicted from the Industrial Hygiene Technician assessment report due to issues on the effectiveness of LEV to remove contaminants. That includes problem of assessing, measuring the fan area, as well as the material fabricated. Thus, the objective of the study was to identify the current compliance of the national law with regards to LEV system. Moreover, besides determining the usage of ducting in LEV by looking into the characteristics of the material using American Society for Testing and Materials (ASTM) standard, the performance of LEV system was tested, as suggested in the ACGIH standard, through design, construct, and measurement data. Three different models (in laboratory scale model) of LEV system were designed according to the ACGIH Standard, and tested to determine the relationship between analytical, experimental, and numerical analyses in this study. As for the three models, they were designed and fabricated to measure velocity and flow of air. Meanwhile, as for numerical analysis, computer simulation i.e. Ansys CFX, Engineering Simulation Software version 14.0 (Ansys 14.0) was used to simulate these three models for verification and comparison. A comparative study was conducted to retrieve analytical, experimental, and simulation results to justify the performances of LEV on different velocity and static pressure values. The results showed that there was insignificant difference between the values of velocity that were calculated, measured, and simulated. The average difference for velocity data was 8%. Static pressure for analytical and experimental results also portrayed insignificant difference compared to simulation that was mostly influenced by the mesh of variable setting. The outcome of the study was to produce the Malaysian Standard on LEV system design, fabrication, measurement, and maintenance. The development of LEV Malaysian Standard through Standard and Industrial Research Institute of Malaysia (SIRIM) Berhad that proposes the evaluation of LEV performance should be carried out before any LEV system is developed due to cost consideration, besides benefiting employees and employers for their safety and health, and in preventing occupational diseases in the future.
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Validate of Local Exhaust Ventilation (LEV) Performance through Analytical, Experimental and Computational Fluid Dynamic (CFD): A Case Study Model
Applied Mechanics and Materials, 2014Co-Authors: Nor Halim Hasan, Abdul Mutalib Leman, Radzai Said, Norzelawati AsmuinAbstract:Local Exhaust Ventilation (LEV) system are a tools in engineering control stated in Occupational safety and health management system where to protect a workers from inhale the contaminant that will effected to their breathing system. To design, construct and applications of LEV are followed an international guidance such as American Conference of Governmental Industrial Hygienist (ACGIH).A sample two inlet and outlet of LEV system are design based on ACGIH including hood, ducting branch, main ducting, elbow, y-tee, fan and stack. The design is based on ACGIH standard with assuming the contaminant are fumes with 2 inlet of 6 inches round duct and outlet is 8 inches round type. The result from calculation according to the size of branch duct size, main duct size, fan capacity and stack size. Other data contribute are velocity and pressure drop along the duct.LEV system are design by using Solid Work Software and export file to Ansys 14.0, where the simulation are used to compare the result of velocity and differentials of pressure before proceeds to construct the system as additional in design process as follow in ACGIH Standard. Finally result of this study indicated that no significant different of the result of velocity along the ducting between design, experimental and compare with the simulation results.Where the analysis shows different compare with analytical almost below 30% and further study on comparative different of static pressure should carry out.
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Baseline Inspection and Measurement of Local Exhaust Ventilation (LEV) Systems at Spray Booth in Manufacturing Plant
Journal of Selcuk University Natural and Applied Science, 2013Co-Authors: M. R Said, Nor Halim Hasan, Abdul Mutalib Leman, Majahar Abd RahmanAbstract:Examination and testing of Local Exhaust Ventilation systems (LEV) that was conducted could help the management to create base or annual performance measurement in industry operations.The LEV will also be verified compliance with original design data, in order to determine adequate of transport velocities are being maintained. The examination also to determine if additional Exhaust hoods can be added to the existing systems and compliance with Occupational Safety and Health (OSH) regulations.This Examination is to obtain the necessary data such as airflow static pressure, speed and total pressure at appropriate points LEV system. The method used is to inspect, analyze and evaluate the performance of Local Exhaust Ventilation systems and related components, evaluate and recommend necessary measures for the restoration or repair of the damage.LEV also need to carry out inspection and tested by a registered professional engineer after construction and installation to demonstrate that the equipment meets the design specifications.Methodology for measurement and testing were based on American Conference of Governmental Industrial Hygienist (ACGIH). Selections of testing points for fume hood and canopy hood with individual suction fan, face velocities were measured and where applicable and accessible, duct transport velocities and static pressure measurements were carried out. Results from measurement data obtained is 65 fpm face velocity and flow rate 6500 fpm is lower than the value proposed by the ACGIH and show spray booth is not able to bring out the contaminants out of the workplace. The LEV systems has been examined and tested; both spray booth number1 and number 2 was below the ACGIH Standard while measurement and inspections conducted and not comply with Local legislation to protect workers safety and health.
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The Performance Test on Local Exhaust Ventilation (LEV) System to Prevent Chlorine Gas Leakage in Water Treatment Plant
International journal of environmental science and development, 2013Co-Authors: Nor Halim Hasan, M. R Said, Abdul Mutalib Leman, Anuar Mohd MokhtarAbstract:Water is a necessity of life to humans and animals. In Malaysia, Government Link Companies (GLC) or Private Companies manages most of the water treatment plants. Chlorine gas is used as one of the water treatment media to treat raw water that will then be distributed for public or commercial usage. The large volume of Chlorine gases used and stored in these treatment plants has the potential to create a disaster if it leaks. Objective of this paper to highlight a result of Local Exhaust Ventilation (LEV) monitoring system and their performance test in controlling of air flow from the chlorine gas building to prevent leakage and spread to the surrounding environment. Methodology used follows the American Governmental Industrial Hygienist (ACGIH). The Chlorine Gas leakage system is checked and verified by using ACGIH Standard. Finally as a result, all the measured parameters (velocity, flow rate, face velocity and brake horse power (bhp)) show that the measurement and monitoring system of LEV are complied with ACGIH Standard and Local Law and Regulations
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Data Comparison on Fumes Local Exhaust Ventilation: Examination and Testing Compliance to USECHH Regulation 2000
2012Co-Authors: Nor Halim Hasan, Abdul Mutalib Leman, Mohd Radzai Said, B. Norerama D. Pagukuman, Jaafar OthmanAbstract:The paper focused on the examination and testing of Local Exhaust Ventilation (LEV) systems at one of Electrical Company to check the transport velocity whether it meet the recommended American Governmental Industrial Hygienist (ACGIH) Standard. The industrial hygiene approaches, AREC (Anticipating, Recognize, Evaluate and Control) were adopted in this study. This is to ensure that the LEV system installed has the optimum efficiency to extract out the contaminants from the workstation. Objective of this study is to make comparison with previous and current monitoring data. The efficiency and the other parameter measured will be the main source to analyze for the particular applications. The differential of data was discussed and several recommendations are proposed to make sure the LEV system performance is excellent.
Michael R. Flynn - One of the best experts on this subject based on the ideXlab platform.
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Local Exhaust Ventilation for the control of welding fumes in the construction industry a literature review
Annals of Occupational Hygiene, 2012Co-Authors: Michael R. Flynn, Pam SusiAbstract:Arc welding is a common unit operation in the construction industry, where frequent changes in location and welding position make it more difficult to control fume exposures than in industries where fixed locations are the norm. Welders may be exposed to a variety of toxic airborne contaminants including manganese (Mn) and hexavalent chromium (CrVI). Local Exhaust Ventilation (LEV) is a well-known engineering control for welding fumes but has not been adopted widely in the construction industry. This literature review presents data on the performance of a variety of LEV systems for welding fume control from the construction (five references), shipyard (five references), and other industries. The studies indicate that LEV can reduce fume exposures to total particulate, Mn, and CrVI to levels below currently relevant standards. Field studies suggest that 40-50% or more reduction in exposure is possible with portable or fixed LEV systems relative to natural Ventilation but that correct positioning of the hood and adequate Exhaust flow rates are essential. Successful implementation of extraction guns for gas metal arc welding (GMAW) and flux core arc welding has been demonstrated, indicating that a successful balance between extraction airflow and shielding gas requirements is possible. Work practices are an important part of achieving successful control of fume exposures; in particular, positioning the hood close to the arc, checking Exhaust flow rates, and avoiding the plume. Further research is needed on hood size effects for controlling welding fume with portable LEV systems and identifying and overcoming barriers to LEV use in construction.
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Local Exhaust Ventilation for the Control of Welding Fumes in the Construction Industry—A Literature Review
Annals of Occupational Hygiene, 2012Co-Authors: Michael R. Flynn, Pam SusiAbstract:Arc welding is a common unit operation in the construction industry, where frequent changes in location and welding position make it more difficult to control fume exposures than in industries where fixed locations are the norm. Welders may be exposed to a variety of toxic airborne contaminants including manganese (Mn) and hexavalent chromium (CrVI). Local Exhaust Ventilation (LEV) is a well-known engineering control for welding fumes but has not been adopted widely in the construction industry. This literature review presents data on the performance of a variety of LEV systems for welding fume control from the construction (five references), shipyard (five references), and other industries. The studies indicate that LEV can reduce fume exposures to total particulate, Mn, and CrVI to levels below currently relevant standards. Field studies suggest that 40-50% or more reduction in exposure is possible with portable or fixed LEV systems relative to natural Ventilation but that correct positioning of the hood and adequate Exhaust flow rates are essential. Successful implementation of extraction guns for gas metal arc welding (GMAW) and flux core arc welding has been demonstrated, indicating that a successful balance between extraction airflow and shielding gas requirements is possible. Work practices are an important part of achieving successful control of fume exposures; in particular, positioning the hood close to the arc, checking Exhaust flow rates, and avoiding the plume. Further research is needed on hood size effects for controlling welding fume with portable LEV systems and identifying and overcoming barriers to LEV use in construction.
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Manganese, Iron, and Total Particulate Exposures to Welders
Journal of Occupational and Environmental Hygiene, 2009Co-Authors: Michael R. Flynn, Pam SusiAbstract:Welders are exposed to a variety of metal fumes, including manganese, that may elevate the risk for neurological disease. This study examines several large data sets to characterize manganese, iron, and total particulate mass exposures resulting from welding operations. The data sets contained covariates for a variety of exposure modifiers, including the presence of Ventilation, the degree of confinement, and the location of the personal sampler (i.e., behind or in front of the welding helmet). The analysis suggests that exposures to manganese are frequently at or above the current ACGIH® threshold limit value of 0.2 mg/m3. In addition, there is evidence that Local Exhaust Ventilation can control the exposures to manganese and total fume but that mechanical Ventilation may not. The data suggest that higher exposures are associated with a greater degree of enclosure, particularly when Local Exhaust Ventilation is absent. Samples taken behind the helmet were, in general, lower than those measured outside of...
