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Design of a Compact Muffler for a Jumbo Drill.

Authors
Visnapuu-A; Lay-SE; Martin-JR; Schwaneke-AE
Source
NTIS: PB 293 282 :12 pages
Link
NIOSHTIC No.
10000273
Abstract
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.
Publication Date
19790101
Document Type
IH; Report of Investigations
Fiscal Year
1979
NTIS Accession No.
PB-293282
NTIS Price
A03
Identifying No.
RI-8337
NIOSH Division
RORC;
Source Name
NTIS: PB 293 282
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