Design of a Compact Muffler for a Jumbo Drill

Details

• Personal Author:
  Lay, Scott E. ; Martin JR ; Schwaneke, Alfred E. ; Visnapuu, Aarne
• Description:
  The Bureau of Mines, as a part of its goal to minimize occupational hazards associated with mining and mineral processing operations, has developed and field tested a compact exhaust air muffler for mechanized, jumbo-mounted pneumatic rock drills. The muffler is constructed of 1/8-inch sheet steel and has nominal dimensions of 1 3/4 by 9 by 13 inches. A directed air passage, flexible neoprene baffles, and an expandable slit-type outlet are incorporated to reduce drill exhaust air noise and eliminate muffler icing. Field tests in actual mining operations showed a 15-dba reduction in exhaust noise and an 8- to 12-dba reduction in overall drilling noise with no icing problems or decrease in drill performance. Data are presented on muffler construction, laboratory, and field test results. [Description provided by NIOSH]
• Subjects:
  Occupational Health Safety
• Series:
  Mining Publications
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Conference Publications ; Case Report
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  RORC - Rolla Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-12
• NIOSHTIC Number:
  nn:10000273
• NTIS Accession Number:
  PB-293282
• Citation:
  NTIS: PB 293 282; :1-12
• Federal Fiscal Year:
  1979
• Peer Reviewed:
  False
• Source Full Name:
  NTIS: PB 293 282
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:ff3c77b33a9e9ea5cd460f66d28ebaf20a75e0e0ff73c57d849f27e65d054d117f4360cdf5ee8dcc4fb13bc67e3d64aaf6de7b5c3c46933619a239b52531c27d
• Download URL:
  https://stacks.cdc.gov/view/cdc/237898/cdc_237898_DS1.pdf
• File Type:
  [PDF - 6.52 MB ]