Tags

Type your tag names separated by a space and hit enter

Effect of hollow bit local exhaust ventilation on respirable quartz dust concentrations during concrete drilling.
J Occup Environ Hyg. 2019 05; 16(5):336-340.JO

Abstract

Drilling large holes (e.g., 10-20 mm diameter) into concrete for structural upgrades to buildings, highways, bridges, and airport runways can produce concentrations of respirable silica dust well above the ACGIH® Threshold Limit Value (TLV® = 0.025 mg/m3). The aim of this study was to evaluate a new method of local exhaust ventilation, hollow bit dust extraction, and compare it to a standard shroud local exhaust ventilation and to no local exhaust ventilation. A test bench system was used to drill 19 mm diameter x 100 mm depth holes every minute for one hour under three test conditions: no local exhaust ventilation, shroud local exhaust ventilation, and hollow bit local exhaust ventilation. There were two trials for each condition. Respirable dust sampling equipment was placed on a "sampling" mannequin fixed behind the drill and analysis followed ISO and NIOSH methods. Without local exhaust ventilation, mean respirable dust concentration was 3.32 (± 0.65) mg/m3 with a quartz concentration of 16.8% by weight and respirable quartz dust concentration was 0.55 (± 0.05) mg/m3; 22 times the ACGIH TLV. For both LEV conditions, respirable dust concentrations were below the limits of detection. Applying the 16.8% quartz value, respirable quartz concentrations for both local exhaust ventilation conditions were below 0.007 mg/m3. There was no difference in respirable quartz dust concentrations between the hollow bit and the shroud local exhaust ventilation systems; both were below the limits of detection and well below the ACGIH TLV. Contractors should consider using either local exhaust ventilation method for controlling respirable silica dust while drilling into concrete.

Authors+Show Affiliations

a Department of Bioengineering , University of California , Berkeley , California.a Department of Bioengineering , University of California , Berkeley , California.a Department of Bioengineering , University of California , Berkeley , California.

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

31013200

Citation

Rempel, David, et al. "Effect of Hollow Bit Local Exhaust Ventilation On Respirable Quartz Dust Concentrations During Concrete Drilling." Journal of Occupational and Environmental Hygiene, vol. 16, no. 5, 2019, pp. 336-340.
Rempel D, Barr A, Cooper MR. Effect of hollow bit local exhaust ventilation on respirable quartz dust concentrations during concrete drilling. J Occup Environ Hyg. 2019;16(5):336-340.
Rempel, D., Barr, A., & Cooper, M. R. (2019). Effect of hollow bit local exhaust ventilation on respirable quartz dust concentrations during concrete drilling. Journal of Occupational and Environmental Hygiene, 16(5), 336-340. https://doi.org/10.1080/15459624.2019.1587171
Rempel D, Barr A, Cooper MR. Effect of Hollow Bit Local Exhaust Ventilation On Respirable Quartz Dust Concentrations During Concrete Drilling. J Occup Environ Hyg. 2019;16(5):336-340. PubMed PMID: 31013200.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of hollow bit local exhaust ventilation on respirable quartz dust concentrations during concrete drilling. AU - Rempel,David, AU - Barr,Alan, AU - Cooper,Michael R, Y1 - 2019/04/23/ PY - 2019/4/24/pubmed PY - 2020/6/10/medline PY - 2019/4/24/entrez KW - Concrete KW - exposure control KW - masonry KW - silica KW - tool design SP - 336 EP - 340 JF - Journal of occupational and environmental hygiene JO - J Occup Environ Hyg VL - 16 IS - 5 N2 - Drilling large holes (e.g., 10-20 mm diameter) into concrete for structural upgrades to buildings, highways, bridges, and airport runways can produce concentrations of respirable silica dust well above the ACGIH® Threshold Limit Value (TLV® = 0.025 mg/m3). The aim of this study was to evaluate a new method of local exhaust ventilation, hollow bit dust extraction, and compare it to a standard shroud local exhaust ventilation and to no local exhaust ventilation. A test bench system was used to drill 19 mm diameter x 100 mm depth holes every minute for one hour under three test conditions: no local exhaust ventilation, shroud local exhaust ventilation, and hollow bit local exhaust ventilation. There were two trials for each condition. Respirable dust sampling equipment was placed on a "sampling" mannequin fixed behind the drill and analysis followed ISO and NIOSH methods. Without local exhaust ventilation, mean respirable dust concentration was 3.32 (± 0.65) mg/m3 with a quartz concentration of 16.8% by weight and respirable quartz dust concentration was 0.55 (± 0.05) mg/m3; 22 times the ACGIH TLV. For both LEV conditions, respirable dust concentrations were below the limits of detection. Applying the 16.8% quartz value, respirable quartz concentrations for both local exhaust ventilation conditions were below 0.007 mg/m3. There was no difference in respirable quartz dust concentrations between the hollow bit and the shroud local exhaust ventilation systems; both were below the limits of detection and well below the ACGIH TLV. Contractors should consider using either local exhaust ventilation method for controlling respirable silica dust while drilling into concrete. SN - 1545-9632 UR - https://www.unboundmedicine.com/medline/citation/31013200/Effect_of_hollow_bit_local_exhaust_ventilation_on_respirable_quartz_dust_concentrations_during_concrete_drilling_ L2 - https://www.tandfonline.com/doi/full/10.1080/15459624.2019.1587171 DB - PRIME DP - Unbound Medicine ER -