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Method factors for anemometer measurement at pipe outlets.

Authors
Garcia-F; Cervik-J
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9061, 1987 Jan; :1-10
NIOSHTIC No.
10005324
Abstract
Gob holes are routinely used by the mining industry to vent methane from gobs and to prevent it from entering the mine ventilation system. In some cases, flows from gob holes are measured by centering an anemometer on the end of a discharge pipe. These measurements are erroneous and tend to be high by as much as 30 pct. The Bureau of Mines determined method factors (correction factors) for anemometer measurements taken in this manner. Method factors for 4-, 6-, and 8-in (10.2-, 15.2-, and 20.3-Cm) id pipe are 0.68, 0.71, and 0.78 Respectively. Comparisons between horizontal and vertical flows indicated no significant change in mehtod factors. Consequently, the method factors for horizontal pipe flows can be applied to vertical upward flows.
Keywords
Pipe-flow; Gas-flow; Ducts; Ventilation; Mining; Mine-ventilation; Mineral-industries; Mine-gases; Mining-industry; Methanes; Methane-drainage; Methane-control; Explosive-gases; Explosive-atmospheres; Underground-mining; Coal-mining; Control-technology; Engineering-controls; Explosion-prevention; Explosive-hazards
Publication Date
19870101
Document Type
IH; Report of Investigations
Fiscal Year
1987
NTIS Accession No.
PB87-183919
NTIS Price
A02
Identifying No.
RI-9061
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9061
State
PA
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