September 1999Volume 51 Issue 9
Coal mine ventilation returns to centrifugal fans
Mining Engineering, 1999, Vol. 51, No. 9, pp. 19-21
Gutzwiller, Les; Kuli, Thomas J.
PREVIEW:Fan applications in the mining industry have changed during the last 70 years. In 1922, J.R. Robinson authored a technical volume entitled Practical Mine Ventilation. At that time, atmospheric control had only recently shifted from natural to mechanical. The large, mechanical draft fans that were used then were centrifugal. The fans ran at low speeds, about 300 rpm. Most were steam-engine driven.
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