NIOSHTIC-2 Publications Search
Method factors for anemometer measurement at pipe outlets.
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9061, 1987 Jan; :1-10
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.
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
IH; Report of Investigations
NTIS Accession No.
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9061
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division