In-Depth Survey Report: A Laboratory Evaluation of a Local Exhaust Ventilation System on a Caterpillar Cold Milling Machine at Caterpillar, Minnesota

Details

• Personal Author:
  Garcia, Alberto ; Hammond, Duane R. ; Henn, Scott ; Shulman, Stanley A.
• Corporate Authors:
  National Institute for Occupational Safety and Health. Division of Applied Research and Technology
• Description:
  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.
• Subjects:
  Construction Industry Dust Engineering Hydrocarbons Infrared Rays Laboratories Manufacturing And Industrial Facilities Occupational Health Safety Silicon Dioxide Ventilation

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• Keywords:
  Analytical-instruments Asphalt Asphalt-industry Construction Construction-equipment Control-equipment Control-systems Control-technology Dust-collection Dust-control Dust-control-equipment Emission-sources Engineering-controls Equipment-design Equipment-reliability Exhaust-ventilation Gases Infrared-spectrophotometry Laboratory-testing Machine-operation Milling-industry OSHA Region 5 Pavement Performance-capability Qualitative-analysis Quantitative-analysis Road-construction Silica Silica-dusts Simulation-methods Testing-equipment Vacuum-cleaning-systems Vacuum-equipment Ventilation-systems

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• Series:
  Engineering and Physical Hazards Survey Reports
• DOI:
  https://doi.org/10.26616/NIOSHEPHB28222a
• Publisher:
  National Institute for Occupational Safety and Health
• Document Type:
  Text
• Name as Subject:
  Caterpillar
• Genre:
  Field Study
• Place as Subject:
  Minnesota ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DART - Division of Applied Research and Technology ; EPHB - Engineering and Physical Hazards Branch
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-12
• NIOSHTIC Number:
  nn:20042060
• NTIS Accession Number:
  PB2013-104683
• Citation:
  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
• CAS Registry Number:
  Silica (CAS RN 7631-86-9) ; Quartz (SiO2) (CAS RN 14808-60-7) ; Sulfur hexafluoride (CAS RN 2551-62-4)
• Federal Fiscal Year:
  2013
• NORA Priority Area:
  Construction
• Peer Reviewed:
  False
• NAICS and SIC Codes:
  333120 - Construction Machinery Manufacturing - (NAICS)
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:4d15853ac9c807b383d159eef7b965b0a0ed5bb556048da621252eccb0fa32b3b081293b0e493a0694becad99e9f60b48587d0b433158476a3a28b46acccdaac
• Download URL:
  https://stacks.cdc.gov/view/cdc/174945/cdc_174945_DS1.pdf
• File Type:
  [PDF - 384.73 KB ]