Compressed Air Plant: The Production, Transmission and Use of Compressed Air, with Special Reference to Mine ServiceJ. Wiley, 1910 - 508 pagina's |
Inhoudsopgave
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Overige edities - Alles bekijken
Compressed Air Plant: The Production, Transmission and Use of Compressed Air ... Robert Peele Volledige weergave - 1910 |
Compressed Air Plant: The Production, Transmission and Use of Compressed Air ... Robert Peele Volledige weergave - 1910 |
Compressed Air Plant: The Production, Transmission and Use of Compressed Air ... Robert Peele Geen voorbeeld beschikbaar - 2015 |
Veelvoorkomende woorden en zinsdelen
adiabatic compression air compressors air cylinders air per minute air pressure air-feed annular atmospheric pressure average back stroke boiler capacity cent clearance coal column compressed air compressed-air connection cooling Corliss Corliss valve cubic feet cubic foot curve cut-off cylinder head diameter discharge valves dry compressors efficiency engine exhaust expansion forward stroke free air friction gauge pressure gear hammer drills heat high-pressure cylinder hole inches increase indicated horse-power Ingersoll-Rand inlet valves intake intercooler isothermal jacket Leyner loss low-pressure cylinder machine drills mean effective pressure mining moisture motor operation ordinary piston speed plant poppet poppet valves ports pounds pump quantity ratio receiver pressure reheating revolutions per minute rock sea-level shaft shown spool-valve stage compression steam cylinders stoping straight-line stroke Sullivan TABLE tank tappet temperature throttle Two-Stage Compressor valve motion volume of air wet compressors
Populaire passages
Pagina 56 - B with the sound velocity where y is the ratio of the specific heat at constant pressure to the specific heat at constant volume, and p is the gas pressure.
Pagina 249 - For short distances the loss of pressure may be considered as taking place according to the laws governing the flow of all fluids, varying directly as the length of pipe, directly as the square of the velocity, and inversely as the diameter of the pipe.
Pagina 36 - The relative diameters of the air and steam cylinders depend on the steam pressure carried, and the air pressure to be produced. In mining operations, there is usually but little variation in these conditions. For rock-drill work, the air pressure is generally from 60 to 80 Ib. In using water-power, a compressor is driven most conveniently by a bucket impact wheel, such as the Pelton or Knight. The waterwheel is generally mounted directly on the crank-shaft, without the use of gearing.
Pagina 265 - C^ and C., are the specific heats of air at constant pressure and constant volume. As no work is done by the expansive force of the air originally produced by compression, W equals the volume of air used, V, multiplied by the difference between P
Pagina 280 - X 2 = 480 88 heat units as the thermal cost of 1 cu. ft. of compressed air at the above temperature and pressure The temperature and volume of the air as it leaves the compressor will be considerably higher than the...
Pagina 62 - For purely adiabatic compression, with no cooling arrangements, n = 1.406; in ordinary single-cylinder dry compressors, provided with a water-jacket, n is roughly 1.3; while in the best wet compressors (with spray injection), n becomes 1.2 to 1.25. In the poorest forms of compressor, the value n = 1.4 is closely approached. For large, well-designed compressors with compound air cylinders, the exponent n may be as small as 1.15.
Pagina 159 - ... and when the usual volume of air is being consumed. (2) Compressors for mines are often rated roughly as furnishing sufficient air to operate a certain number of rock drills; a 3'' drill requires a volume of air at 60 Ib. pressure, equal to 100 or 110 cu. ft. of free atmospheric air per minute. (3) In terms of cubic feet of free air compressed per minute to a given pressure. As the actual capacity of a compressor depends on the density of the intake air, it will obviously be reduced in working...
Pagina 250 - ... pipe of the same length. The character of the pipe also, and the condition of its inner surface, have much to do with the friction developed by the flow of air. Besides imperfections in the surface of the metal, the irregularities incident...
Pagina 256 - When the initial velocity much exceeds 50 ft. per second, the percentage loss becomes very large; and, conversely, by using piping large enough to keep down the velocity, the friction loss may be almost eliminated. For example, at the Hoosac tunnel, in transmitting 875 cu. ft. of free air per minute, at an initial pressure of 60 lb., through an 8
Pagina 50 - F = the volume of the given weight of air (or gas) at the freezingpoint and at a pressure P; F' = the volume of the same weight of air at the same temperature and at any pressure, P' (the pressures being absolute pressures).