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In-depth survey report: a laboratory evaluation of a local exhaust ventilation system on a Caterpillar cold milling machine at Caterpillar, Minnesota.

Authors
Hammond-DR; Garcia-A; Henn-S; Shulman-SA
Source
Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, EPHB-282-22a, 2012 Nov; :1-12
NIOSHTIC No.
20042060
Abstract
In August 2012, National Institute for Occupational Safety and Health (NIOSH) researchers and the Silica/Milling-Machines Partnership coordinated by the National Asphalt Pavement Association (NAPA) conducted laboratory testing of a local exhaust ventilation (LEV) system on a Caterpillar PM200 cold milling machine. The testing was conducted indoors at a Caterpillar facility in Minnesota. All tests were conducted on a stationary milling machine with the cutter drum and conveyor belts moving, but without any reclaimed asphalt pavement (RAP) moving through the system. Smoke and tracer gas were used as surrogates for silica dust to evaluate capture efficiencies of the dust emission-control system in the cutter drum housing of the machine. Smoke was used as an initial qualitative test to visually check for leaks. Sulfur Hexafluoride (SF6) was used to quantitatively evaluate the capture efficiency of tracer gas released in the cutter drum housing of the machine. A Miran SapphIRe infrared spectrometer was used to measure the resulting SF6 concentrations in the LEV exhaust duct. Capture efficiency tests were conducted at four flow rates of 1,675 actual cubic feet per minute (acfm), 1,450 acfm, 1,250 acfm, and 980 acfm with mean capture efficiency results of 98.1%, 97.5%, 94.7%, and 88.6%, respectively. Additional testing during actual milling activities is recommended to document capture efficiency under true field conditions.
Keywords
Control-technology; Engineering-controls; Region-5; Construction; Ventilation; Ventilation-systems; Exhaust-ventilation; Laboratory-testing; Machine-operation; Milling-industry; Construction-equipment; Road-construction; Simulation-methods; Engineering; Equipment-design; Control-equipment; Control-systems; Dust-collection; Dust-control; Dust-control-equipment; Equipment-reliability; Performance-capability; Emission-sources; Testing-equipment; Qualitative-analysis; Quantitative-analysis; Gases; Analytical-instruments; Infrared-spectrophotometry; Vacuum-cleaning-systems; Vacuum-equipment; Testing-equipment; Silica-dusts; Asphalt-industry; Equipment-reliability; Author Keywords: Silica; Asphalt; Pavement
CAS No.
7631-86-9; 14808-60-7; 2551-62-4
Publication Date
20121101
Document Type
Field Studies; Control Technology
Fiscal Year
2013
NTIS Accession No.
PB2013-104683
NTIS Price
A03
Identifying No.
EPHB-282-22a
NIOSH Division
DART
Priority Area
Construction
SIC Code
NAICS-333120
Source Name
National Institute for Occupational Safety and Health
State
OH; MN
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