Mining And Mine Ventilation a Practical Handbook On the Physics And Chemistry

Cover Mining And Mine Ventilation a Practical Handbook On the Physics And Chemistry
Mining And Mine Ventilation a Practical Handbook On the Physics And Chemistry
Walsh James Joseph
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Per sq. Ft.
80. What is the horse power in Question 79?
Ans. 40 H. P.
81. An airway is 6 ft. By 10 ft. And 2400 ft. Long. If the air is moving at a velocity of 500 ft. Per minute, what is the pressure per square foot and the total ventilating pressure? Ans. 6. 4 Ibs. Per sq. Ft.
384 Ibs. Total pressure.
82. The quantity of air passing through an airway is 100, 000 cu. Ft. Per minute, the area of the airway is 125 sq. Ft. And the rubbing surface is 175, 000 sq. Ft. What is the pressure per squar
...e foot and the total pressure pro- ducing ventilation? Ans. 17. 92 Ibs. Per sq. Ft.
2240 Ibs. Total pressure.
83. An airway 10 ft. By 10 ft. Is 1 mile long; the quan- tity of air passing is 150, 000 cu. Ft. Per minute, the total pressure is 500 Ibs. What is the coefficient of friction?
Ans. . 00000000105.
84. If in the above example the water gauge was 2J ins. , what would be the coefficient of friction?
I Ans. . 00000000273.
MINE FIRES 173 85. If (in Question 83) the horse-power producing ventilation is 40, what is the coefficient of friction?


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