- 行业: Mining
- Number of terms: 33118
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The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
The total of the static head (the suction discharge heads), the friction head, together with any discharge head that must be overcome by a pump is termed the total dynamic head.
Industry:Mining
The total pressure divided by the number of area units on which the load is imposed, such as the diamonds in a diamond-bit crown, usually expressed as pounds per square inch, tons per square foot, pounds per diamond, etc.
Industry:Mining
The total resistance (R) or friction of a ventilation system is calculated from the total ventilating pressure (P) and the total quantity of air at the fan (Q). Thus: R= P/Q<sub>2</sub>.
Industry:Mining
The total rolling friction of a train on straight level track. It is generally taken as 30 lb per short ton weight (15 kg/t) of the train for cars having plain bearings and 20 lb/st (10 kg/t) for cars with roller bearings. These figures may be increased by 10 to 15 lb (5.0 to 7.5 kg) if the track is in poor condition and may be less for track in excellent condition.
Industry:Mining
The total thrust, expressed in pounds or tons, that the hydraulic-feed mechanism on a drill can impose on a drill string; also, the pressure of the fluid within the hydraulic cylinders, generally expressed in pounds per square inch.
Industry:Mining
The total time between the initial application of current and the rupture of the circuit within the detonator.
Industry:Mining
The total tonnage of clean coal produced at a mine as distinct from pithead output. It is the tonnage of coal as weighed after being cleaned and classified in the preparation plant.
Industry:Mining
The total tonnage of raw coal produced at a colliery, as distinct from saleable output. It is the tonnage of coal as weighed before it enters the coal-preparation plant.
Industry:Mining
The totality of electric and magnetic phenomena, or their study; particularly those phenomena with both electric and magnetic aspects, such as electromagnetic induction.
Industry:Mining
