232. The Effect of Wind Speed Upon Aerosol Penetration into an Enclosure

Heitbrink, William A.; Thimons, Edward D.; Organiscak, John A.; Cecala, Andrew B.

doi:10.3320/1.2763568

Cited by 4 publications

(7 citation statements)

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“…Lower respirable dust PFs of 2.8 to 10 were measured on the drill, truck, and loader cabs with pressurization less than or equal to 0.015 in wg. To prevent outside contaminants from being blown into the enclosure, its static pressure must be higher than the wind's velocity pressure [Heitbrink et al 2000;NIOSH 2008b].…”

Section: Objectivementioning

confidence: 99%

“…Equation 1 shows the relationship developed and tested by Heitbrink using Bernoulli's Equation, when applied to orifice flow at turbulent and uncompressed airflow conditions. He found good agreement with outside airflow and contaminant infiltration into an enclosure through the circular holes, directly facing into the wind [Heitbrink et al 2000]. The determination of the equivalent wind velocity for a given enclosure pressure that prevents this enclosure infiltration is shown in Equation 2 [NIOSH 2008b;NIOSH 2012a].…”

Section: Objectivementioning

confidence: 99%

See 1 more Smart Citation

Design, testing, and modeling of environmental enclosures for controlling worker exposure to airborne contaminants.

Organiscak¹,

Cecala²,

Hall³

2018

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This document is in the public domain and may be freely copied or reprinted. Disclaimer Mention of any company or product does not constitute endorsement by the National Institute for Occupational Safety and Health (NIOSH). In addition, citations to websites external to NIOSH do not constitute NIOSH endorsement of the sponsoring organizations or their programs or products. Furthermore, NIOSH is not responsible for the content of these websites. All web addresses referenced in this document were accessible as of the publication date.

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Section: Objectivementioning

confidence: 99%

Section: Objectivementioning

confidence: 99%

Design, testing, and modeling of environmental enclosures for controlling worker exposure to airborne contaminants.

Organiscak¹,

Cecala²,

Hall³

2018

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“…In addition to the OASIS system, an exhaust hood was also used next to the air slide area to capture the dust blown from the bag (Figure 6.16) [Cecala et al 2000]. With this setup, or any other industrial application using an exhaust hood, one area of concern for overexposure is when a worker positions himself/herself between the dust source and the exhaust hood.…”

Section: Semi-automated Bag Palletizing Systemsmentioning

confidence: 99%

“…Testing has shown that the installation of new door gaskets and plugging and sealing cracks and holes in the shell of the enclosure have a major impact on increasing the enclosure pressurization. To prevent dust-laden air from infiltrating into the enclosure, the enclosure's static pressure must be higher than the wind's velocity pressure [Heitbrink et al 2000]. Equation 9.3 is u sed to determine the wind velocity equivalent for an enclosure (the wind velocity at which the cab is protected from outside infiltration as determined by the static pressure):…”

Section: Ensuring Enclosure Integrity By Achieving Positive Pressurizmentioning

confidence: 99%

Dust control handbook for industrial minerals mining and processing.

Cecala¹,

O'brien²,

Schall³

et al. 2012

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Capturing hood. A hood positioned as close to a dust source as possible to capture the dust-laden air and pull it into an exhaust ventilation system. Carryback. Material that sticks or clings to a conveyor belt after passing over the head pulley. Cartridge collector. In dust collection systems, a type of collector that captures particulate from a gas stream by forcing the gas through filter elements, which are arranged in a pleated configuration. Centrifugal collector. In dust collection systems, a device that separates particulate from the air by centrifugal force. Also called a cyclone. Centrifugal fan. A fan in which the airflow is drawn into the rotating impeller and discharged radially from the fan blade into the housing. Centrifugal fans include radial, backward, and forward blade type. Chimney effect. The behavior of heated air or gas rising in a vertical passage, as in a chimney, due to its lower density compared to the surrounding air or gas. Chronic silicosis. A slowly progressive, nodular form of silicosis that typically develops after 10-30 years of exposures to respirable crystalline silica dust. Coanda effect. The tendency of a moving fluid to be attracted to a nearby surface. Collaring. The preliminary step in drilling, forming the beginning of a drill hole, or collar. Contact angle. The angle at which a liquid meets a solid surface. Control efficiency. A metric usually expressed as a percentage used to compare the results of two or more outcomes. Crown. The mid-point of a road raised such that water drains off either side of the road surface into a ditch. In cross-section, the shape of the road is depicted as an A-shape, with the highest point in the center of the road. Cure. The hardening of a chemical additive and base material. Cuttings. Material that is produced during the drilling process. Cuttings are usually a fine-sized material. Cyclone. In dust collection systems, a conical device that uses centrifugal force to separate large-and small-diameter particles. Deliquescent. The ability of a material to absorb moisture from the air and become liquid. Depth loading. In dust collection systems, a method of collecting particulate on a fabric by maintaining a filter cake on the fabric to optimize collection efficiency. When depth loading is used on a particular fabric, dust is intentionally allowed to penetrate into the fabric to form a layer of dust on the bag.

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“…(237) While dogma has set static pressure requirements for vehicle enclosures ('6 mm water gauge), wind speed simulations appear to support this approach. (238) Tractor cab ventilation parameters have become the focus in studies demonstrating a broad range of lter effectiveness. (239) Methods vary widely in the control of refractory ceramic bers (240) and contaminants applicable to ready-mix concrete truck mixers.…”

Section: Ventilation and Air Contaminant Controlmentioning

confidence: 99%

60th Annual American Industrial Hygiene Conference and Exposition

Pierce¹

2000

Applied Occupational and Environmental Hygiene

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232. The Effect of Wind Speed Upon Aerosol Penetration into an Enclosure

Cited by 4 publications

References 0 publications

Design, testing, and modeling of environmental enclosures for controlling worker exposure to airborne contaminants.

Design, testing, and modeling of environmental enclosures for controlling worker exposure to airborne contaminants.

Dust control handbook for industrial minerals mining and processing.

60th Annual American Industrial Hygiene Conference and Exposition

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