Hammond-DR; Mead-KR; Trifonoff-N; Shulman-SA
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-282-20a, 2011 Dec; :1-18
In August 2011, NIOSH researchers and the Silica/Milling-Machines Partnership coordinated by the National Asphalt Pavement Association (NAPA) conducted laboratory testing of a prototype local exhaust ventilation (LEV) system on a Terex PR600c cold milling machine. The testing was conducted indoors at the Terex Roadbuilding manufacturing facility in Oklahoma City, Oklahoma. All tests were conducted on a stationary milling machine with the cutter drum spinning and belts stationary, and without any reclaimed asphalt pavement (RAP) moving through the system. Terex engineers used cardboard and plastic to simulate the level of gap-seal to be provided in a true production machine factory-equipped with an LEV control 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 capture efficiency of tracer gas released in the cutter drum housing of the machine. Two independent analytical instruments were used to measure the resulting SF6 concentrations in the LEV exhaust duct, a Bruel & Kjaer (B&K) photoacoustic analyzer and a Miran SapphIRe infrared spectrometer.
Control-technology; Engineering-controls; Region-6; 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
7631-86-9; 14808-60-7; 2551-62-4
Field Studies; Control Technology
NTIS Accession No.
National Institute for Occupational Safety and Health