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[54] => Operating Engineer
[56] => Painter
[58] => Paper Hanger
[60] => PCC/Restoration
[62] => Pile Driver
[64] => Plasterer
[66] => Plumber/Pipefitter
[68] => Refractory Worker
[70] => Reinforcing Ironworker
[72] => Roofer/Waterproofer
[74] => Scaffold Erector
[76] => Sheetmetal Worker
[78] => Sprinkler Fitter
[80] => Stonemason
[82] => Structural Ironworker
[84] => Terrazzo Worker
[86] => Tile Setter
[88] => Truck Driver
[90] => Welder
[92] => Commercial & Institutional
[93] => Jobsites
[94] => Heavy & Highway
[96] => Industrial
[98] => Renovations
[100] => Residential
[102] => Images
[103] => Media
[104] => Media & Documents
)
[type] => Images
[sub_category] =>
[url] => /image/4245/i002704/Arborist%2Bbeing%2Braised%2Bby%2Bcrane%2Bto%2Btrim%2Btrees.html
[item:protected] => ImageRecord Object
(
[records:protected] => Array
(
)
[recordId:protected] =>
[searchWordClass:protected] =>
[searchWordPeerClass:protected] =>
[bok_record:protected] =>
[authors:protected] =>
[organizations:protected] =>
[collections:protected] =>
[categories:protected] => Array
(
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(
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[type:protected] => category
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[label:protected] => Cranes & Hoists
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)
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[type:protected] => category
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[label:protected] => Falls
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(
)
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(
)
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(
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[type:protected] => category
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[label:protected] => Acoustical Ceiling Carpenter
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)
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(
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(
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[type:protected] => category
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[label:protected] => Asbestos/Insulator
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(
)
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(
)
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(
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[type:protected] => category
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[label:protected] => Boilermaker
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)
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[label:protected] => Bricklayer
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)
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(
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[type:protected] => category
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[label:protected] => Cabinetmaker
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)
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(
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(
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(
)
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(
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(
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[label:protected] => Carpet Layer
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(
)
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(
)
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(
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[type:protected] => category
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[label:protected] => Cement Mason
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(
)
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(
)
)
[52] => Category Object
(
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[bok_topics:protected] =>
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[type:protected] => category
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[label:protected] => Commercial Diver
[alreadyInSave:protected] =>
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[validationFailures:protected] => Array
(
)
[_new:BaseObject:private] =>
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(
)
)
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(
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[type:protected] => category
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[label:protected] => Concrete Polisher
[alreadyInSave:protected] =>
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(
)
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(
)
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(
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[type:protected] => category
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[label:protected] => Drywall Applicator Specialist
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(
)
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(
)
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[55] => Category Object
(
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[type:protected] => category
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[label:protected] => Electrical Worker
[alreadyInSave:protected] =>
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(
)
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(
)
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[56] => Category Object
(
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[type:protected] => category
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[label:protected] => Elevator Constructor
[alreadyInSave:protected] =>
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(
)
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(
)
)
[57] => Category Object
(
[languages:protected] =>
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[type:protected] => category
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[label:protected] => Flagger
[alreadyInSave:protected] =>
[alreadyInValidation:protected] =>
[validationFailures:protected] => Array
(
)
[_new:BaseObject:private] =>
[_deleted:BaseObject:private] =>
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(
)
)
[58] => Category Object
(
[languages:protected] =>
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[type:protected] => category
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[label:protected] => Glazier
[alreadyInSave:protected] =>
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(
)
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(
)
)
[59] => Category Object
(
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[type:protected] => category
[parent:protected] => 2
[label:protected] => Hazardous Waste Cleanup
[alreadyInSave:protected] =>
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(
)
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(
)
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(
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[type:protected] => category
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[label:protected] => HVAC
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(
)
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(
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(
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[type:protected] => category
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[label:protected] => Interior Systems Carpenter
[alreadyInSave:protected] =>
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(
)
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(
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[64] => Category Object
(
[languages:protected] =>
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[type:protected] => category
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[label:protected] => Laborer
[alreadyInSave:protected] =>
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(
)
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(
)
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[65] => Category Object
(
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[type:protected] => category
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[label:protected] => Landscaper
[alreadyInSave:protected] =>
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(
)
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(
)
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[66] => Category Object
(
[languages:protected] =>
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[type:protected] => category
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[label:protected] => Lather
[alreadyInSave:protected] =>
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(
)
[_new:BaseObject:private] =>
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(
)
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[67] => Category Object
(
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[type:protected] => category
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[label:protected] => Lead Abatement Worker
[alreadyInSave:protected] =>
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[validationFailures:protected] => Array
(
)
[_new:BaseObject:private] =>
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(
)
)
[68] => Category Object
(
[languages:protected] =>
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[type:protected] => category
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[label:protected] => Maintenance Worker
[alreadyInSave:protected] =>
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(
)
[_new:BaseObject:private] =>
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(
)
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[69] => Category Object
(
[languages:protected] =>
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[type:protected] => category
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[label:protected] => Millwright
[alreadyInSave:protected] =>
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(
)
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(
)
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[label:protected] => Operating Engineer
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(
)
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(
)
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)
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(
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[label:protected] => Pile Driver
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(
)
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(
)
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)
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[label:protected] => Refractory Worker
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(
)
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[label:protected] => Reinforcing Ironworker
[alreadyInSave:protected] =>
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(
)
[_new:BaseObject:private] =>
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(
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[label:protected] => Roofer/Waterproofer
[alreadyInSave:protected] =>
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(
)
[_new:BaseObject:private] =>
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(
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[label:protected] => Scaffold Erector
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)
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)
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[label:protected] => Tile Setter
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(
)
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)
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[86] => Category Object
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[type:protected] => category
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[label:protected] => Welder
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(
)
[_new:BaseObject:private] =>
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[summary:protected] => This arborist is being raised on a boatswain's chair to access the tops of trees. This is a very dangerous practice that OSHA does not allow except under the following conditions:
The use of equipment to hoist employees is prohibited except where the employer demonstrates that the erection, use, and dismantling of conventional means of reaching the work area, such as a personnel hoist, ladder, stairway, aerial lift, elevating work platform, or scaffold, would be more hazardous, or is not possible because of the project's structural design or worksite conditions. Source: 1926.1431(a)
The American National Standards Institute has a standard specifically written for arborists (Z133-2012) that allows this use of cranes, but only after a qualified person has authorized it by determining that it is the "safest and/or only feasible method to perform the work or gain access to a tree."
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[summary:protected] => This CPWR Hazard Alert on Fumes and Gases describes the exposures created by welding, cutting and burning and the health effects they cause. It also recommends control measures and warns about the increased risks of welding in a confined space. Click on the following links to access the English version and the Spanish version.
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[summary:protected] => This 8-min. video shows how local-exhaust ventilation can reduce worker exposures to toxic fumes during welding. Watch exposures change using real-time monitoring. Produced by CPWR - The Center for Construction Research and Training.
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[summary:protected] => Following an extensive review of commercially available portable local exhaust systems (LEVs) for welding fume, the Welding Partnership for Advancing Control Technologies in Construction (PACT) used a rating procedure to select which LEV systems should be tested for exposure control effectiveness and usability. This report tested the Trion Airboss OneMan portable LEV in a "laboratory-like setting." The results provided strong evidence that the tested system, "provided substantial reductions in Cr VI exposures when stainless steel welding. These data therefore support the use of this LEV system on construction jobs where stainless steel welding is being conducted."
The reduction in manganese exposures with use of the tested system was less substantial. Given the lack of statistical significance between the means measured with and without LEV, these results provide weak evidence of manganese reduction with the tested system.
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[summary:protected] => This report is from a project called AIMS (Adoption of Innovations to Minimize Fumes and Dusts in Construction) that uses an industry partnership to select the most promising local exhaust ventilation systems to be evaluated and to promote use of LEV for welding fumes in the construction industry. The Lincoln Electric X-Tractor® 1C (Lincoln Electric, Cleveland, OH; manufactured in Norway) received the second-highest rating (behind only the Trion AirBoss One-Man Portable LEV system which was evaluated in 2012.) . Use of the tested LEV system resulted in a statistically significant 87% reduction in geometric mean Cr VI exposure levels when welding stainless steel. The hexavalent chromium (Cr VI) mean and geometric mean concentration without LEV use were greater than the OSHA PEL and Action Level for an 8-hour time-weighted average. The mean, geometric mean and maximum Cr VI concentration for trials where LEV was used, on the other hand, were all lower than the PEL and Action Level.
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[summary:protected] => This presentation by Mike Flynn at the AIHA conference in May 2013, co-authored by Pam Susi of CPWR, was an analysis of an impressive data set of 30 years of welding sampling results from OSHA compliance inspections. The data set included 100,000 measurements collected on 30,000 welders from 1978 to 2008. The results indicated that heavy construction and structural steel erection had elevated risks of overexposure to manganese and lead jointly.
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[summary:protected] => This CPWR Hazard Alert on Fumes and Gases describes the exposures created by welding, cutting and burning and the health effects they cause. It also recommends control measures and warns about the increased risks of welding in a confined space. Click on the following links to access the English version and the Spanish version.
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[summary:protected] => Esta advertencia de peligro de CPWR sobre Vapores y Gases describe las exposiciones creadas al soldar, cortar y quemar y los efectos de salud que causan. También recomienda medidas de control y advierte sobre el aumento de los riesgos de soldadura en un espacio confinado. Haga clic en los siguientes enlaces para acceder a la versión en Inglés y la versión en Español.
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[summary:protected] => This 8-min. video shows how local-exhaust ventilation can reduce worker exposures to toxic fumes during welding. Watch exposures change using real-time monitoring. Produced by CPWR - The Center for Construction Research and Training.
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[summary:protected] => Following an extensive review of commercially available portable local exhaust systems (LEVs) for welding fume, the Welding Partnership for Advancing Control Technologies in Construction (PACT) used a rating procedure to select which LEV systems should be tested for exposure control effectiveness and usability. This report tested the Trion Airboss OneMan portable LEV in a "laboratory-like setting." The results provided strong evidence that the tested system, "provided substantial reductions in Cr VI exposures when stainless steel welding. These data therefore support the use of this LEV system on construction jobs where stainless steel welding is being conducted."
The reduction in manganese exposures with use of the tested system was less substantial. Given the lack of statistical significance between the means measured with and without LEV, these results provide weak evidence of manganese reduction with the tested system.
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[title:protected] => Welding Fume Local Exhaust Ventilation (LEV)Evaluation: the Lincoln Electric X-Tractor Portable LEV System
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[summary:protected] => This report is from a project called AIMS (Adoption of Innovations to Minimize Fumes and Dusts in Construction) that uses an industry partnership to select the most promising local exhaust ventilation systems to be evaluated and to promote use of LEV for welding fumes in the construction industry. The Lincoln Electric X-Tractor® 1C (Lincoln Electric, Cleveland, OH; manufactured in Norway) received the second-highest rating (behind only the Trion AirBoss One-Man Portable LEV system which was evaluated in 2012.) . Use of the tested LEV system resulted in a statistically significant 87% reduction in geometric mean Cr VI exposure levels when welding stainless steel. The hexavalent chromium (Cr VI) mean and geometric mean concentration without LEV use were greater than the OSHA PEL and Action Level for an 8-hour time-weighted average. The mean, geometric mean and maximum Cr VI concentration for trials where LEV was used, on the other hand, were all lower than the PEL and Action Level.
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[summary:protected] => Article highlighting how cheap portable Local Exhaust Ventilation units can reduce exposure to welding fumes.
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[summary:protected] => This presentation by Mike Flynn at the AIHA conference in May 2013, co-authored by Pam Susi of CPWR, was an analysis of an impressive data set of 30 years of welding sampling results from OSHA compliance inspections. The data set included 100,000 measurements collected on 30,000 welders from 1978 to 2008. The results indicated that heavy construction and structural steel erection had elevated risks of overexposure to manganese and lead jointly.
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[title:protected] => Selection of Commercially Available Portable Local Exhaust Ventilation to be Evaluated for Effectiveness in Controlling Worker Exposures to Welding Fumes in Construction
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[summary:protected] => This study was conducted by the CPWR Welding Pact, which collected data for 81 mobile and 54 portable local exhaust ventilation units for capturing welding fumes. Ten portable LEV units for welding fumes were selected for further consideration. Guidance from the Welding PACT and industry stakeholders, as well as the information gleaned from this project, will be used in shaping strategies aimed at encouraging greater use of LEV for welding fumes in construction.
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Prepared for: The Center for Construction Research and Training (CPWR), 8484 Georgia Avenue, Suite 1000 Silver Spring, MD 20910, (301) 578-8500
Prepared by: John D. Meeker, MS, ScD, CIH, Associate Professor, Environmental Health Sciences, School of Public Health, University of Michigan
Edited By: Robert F. Herrick, ScD, CIH Pam Susi, MSPH
Introduction
Welding is common in construction and is performed by several trades, including boilermakers, pipefitters, ironworkers, sheet metal workers and others. Overexposures to welding fumes among these trades are of concern due to various toxic constituents found in welding fume, including manganese which is neurotoxic and hexavalent chromium which is carcinogenic. Despite documented overexposure to toxic metals from welding fume, there are a number of factors that restrict the availability and adoption of exposure controls on construction sites (Meeker et al. 2007; 2010). As part of its research project entitled, “Adoption of Innovations to Minimize (AIMS) Exposure to Dust and Fumes in Construction, the Center for Construction Research and Training (CPWR) is seeking to 1) identify technologically feasible and effective engineering controls to reduce worker exposures, 2) enhance adoption of exposure controls on construction jobs by contractors, and 3) provide training to workers to make sure adopted controls are used correctly to optimize their effectiveness.
A central part of AIMS is the formation and use of Partnerships for Advancing Control Technologies (PACTs) in Construction. The welding PACT is co-facilitated by Dr. Robert Herrick, Harvard University, and Ms. Pam Susi, CPWR. The welding PACT consists of representatives from a cross-section of interests including construction contractors, government, equipment manufacturers/suppliers, labor representatives and academic researchers. In year one of the project (2010-2011), the Welding PACT identified and rated key criteria used in the selection of welding fume control technologies. In the current grant year (2011-2012), they will use those criteria to select 3 control technologies to be evaluated in years 2-4 of the project.
This report summarizes the results of an extensive search of commercially available, portable local exhaust ventilation (LEV) systems for welding fumes, conducted by Dr. John Meeker, University of Michigan. As a result of this search, up to 10 LEV units were selected as possible candidates for future detailed assessment of their exposure control effectiveness and usability. Important selection criteria identified by the PACT were used to determine which LEV systems would be included in this subset. This report is intended to provide the CPWR Welding PACT with the information they will need for selecting three LEV systems for further study.
Selection and performance of LEV systems may be influenced by a number of considerations. These include the type of welding to be performed (SMAW, MIG, TIG, other), the type of metal being welded (carbon steel, stainless steel, other), the exposure (e.g. total fume, hexavalent chromium, manganese, other) and exposure level of concern relative to health-based or legal Occupational Exposure Limits (OELs; e.g. ACGIH, NIOSH, OSHA). The nature and location of the majority of the welds to be made determine portability needs (shop vs. site, “bench/stand” vs. “position/field”, tight enclosed spaces vs. open work area, etc.). In addition, the number of welders in the immediate area may also determine the best LEV setup (e.g. single vacuum and single hood, single vacuum and multiple hoods, multiple vacuums and multiple hoods, etc).
Other factors which may influence selection of a specific LEV technology on a job site includes cost, weight and portability, durability and material of construction, maintenance needs, impact on productivity (e.g. costs and time associated with setting up, repositioning, replacing filters, etc.), visibility and quality of work, electrical power requirements, and other factors. While all these factors are important, LEV exposure control effectiveness should be the primary factor in the decision-making process. This report provides the available information on some of these factors related to commercially-available LEV systems for use by the PACT in their determination for which systems warrant further study.
Methods
DATA GATHERING AND EVALUATION CRITERIA
The primary method