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In-depth survey report of a water spray device for suppressing respirable and crystalline silica dust from jackhammers at E.E. Cruz Company, South Plainfield, New Jersey, report no. CT-282-11c-2.

Authors
Echt-A; Sieber-K; Williams-D; Cantrell-A; Schill-DP; Lefkowitz-D; Sugar-J; Hoffner-K
Source
NIOSH 2004 Jun; :1-18
NIOSHTIC No.
20025095
Abstract
The objective of this study was to quantify the exposure reduction that could be achieved through the use of a water spray attachment while breaking concrete with jackhammers. The effectiveness of the water spray examined in this study was evaluated by measuring the reduction in the respirable dust and quartz exposures in the breathing zones of two construction workers when the dust control device was used compared to the exposure when no dust control device was used. Respirable dust exposure was measured in real time using a portable laser photometer. In addition, personal breathing zone samples for respirable dust and respirable crystalline silica were collected and analyzed using established NIOSH methods. Water applied using a solid cone nozzle at a flow rate of 300 mL of water per minute resulted in a 69 to 71% reduction in respirable dust exposure and a 77% reduction in quartz exposure. A water flow rate of 250 mL/minute resulted in a 42 to 43% reduction in respirable dust exposure and a 39% reduction in silica exposure. Use of the control with a clogged nozzle resulted in exposure increases. The best exposure reduction demonstrated in these trials would permit a worker to use the jackhammer under these conditions for up to 4 hours and 45 minutes in an eight-hour shift with no other exposures to quartz without exceeding the REL or up to 6 hours and 40 minutes in an eight-hour shift with no other quartz exposures without exceeding the calculated OSHA PEL.
Keywords
Construction-equipment; Construction-workers; Control-equipment; Control-technology; Jack-hammers; Respirable-dust; Silica-dusts; Engineering-controls; Equipment-design; Exposure-levels; Exposure-limits; Breathing-zone; Analytical-methods; Sampling; Quartz-dust; Region-2
Contact
National Institute for Occupational Safety and Health, Division of Applied Research and Technology, Engineering and Physical Hazards Branch, Mail Stop R-5, 4676 Columbia Parkway, Cincinnati, OH 45226-1998
CAS No.
14808-60-7
Publication Date
20040629
Document Type
Field Studies; Control Technology
Funding Type
Construction
Fiscal Year
2004
NTIS Accession No.
PB2004-106475
NTIS Price
A03
Identifying No.
CT-282-11c-2
NIOSH Division
DART
Priority Area
Research Tools and Approaches: Control Technology and Personal Protective Equipment
SIC Code
1611
Source Name
National Institute for Occupational Safety and Health
State
NJ; NY; OH
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