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Reverse performance characteristics of main mine fans
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August 1983
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Description:"During a mine fire or other emergency, it may be desirable to reverse the airflow in order to provide an escapeway or to isolate a fire. Also, in colder areas, the airflow may be reversed to prevent ice buildup. When reversing main mine fans, the mine operator usually does not know what operating characteristics of flow and pressure to expect. Laboratory and field tests of vane-axial main mine fans in the 7- to 9-ft-diam size range were conducted to establish forward and reverse performance characterisitcs under controlled conditions and at typical mine installations. The data obtained suggest that reverse performance characteristics are dependent upon the blade angle and the hub-to-tip ratio. There is also evidence that reverse performance can be predicted for a family of bland angles and a given hub-to-tip ratio. Generally, quantity of air is 30% to 65% less in reverse than when operating in the normal forward mode." - NIOSHTIC-2
NIOSH no. 10003480
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