Modern Compressed Air Locomotives: A Descriptive Catalogue of Two-stage Compressed Air Locomotives and the Necessary Auxiliary Apparatus for Successful Operation and Maintenance

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H. K. Porter Company, 1914 - Air-compressors - 80 pages

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Page 11 - Compressors supplying locomotives with air must deliver the air at a relatively high pressure — much higher than the pressure at which the air is admitted to the cylinders of the locomotive, in order that a sufficient quantity may be available to drive the locomotive a distance on one charge, which when everything is considered, will give the best and most economical results. Ordinarily a compressor capable of compressing air to a pressure of about 1000 pounds per square inch is found most satisfactory.
Page 34 - A nozzle, through which compressed air at a pressure of 80 to 100 pounds per square inch...
Page 8 - It is a locomotive in which compressed air is partially expanded in a high-pressure cylinder until it becomes much colder than the surrounding atmosphere. This air is then passed through an interheater in which it is heated to nearly atmospheric temperature by extended contact with the surrounding air. The expansion is then completed in a low-pressure cylinder.
Page 8 - ... baffle plates, the air passes. The final exhaust air from the low-pressure cylinder is utilized in an ejector apparatus, similar to the smoke stack and exhaust nozzle of a steam locomotive, to draw a rapid current of the surrounding atmospheric air through the small tubes. Thus the...
Page 8 - The two-stage locomotive has therefore been designed to expand the air in two successive cylinders with an atmospheric interheater located between them, through which the exhaust air from the high-pressure cylinder passes before it enters the low-pressure cylinder. The construction of the interheater in its most efficient form is clearly shown by the diagram on page 68.
Page 9 - From time to time efforts have been made to increase the efficiency of the compressed air locomotive by use of more elaborate valve gears and by the use of compound cylinders; but without effective and substantial preheating or interheating, all such efforts were predestined to failure.
Page 71 - ... would have been gathered in 553 hours had the locomotives continued to work at the same rate which they maintained for nine hours per day and six days in the week. This was done in order to make the cost more truly comparable.
Page 10 - A Compressed Air Locomotive consists of : A main storage reservoir carrying a supply of compressed air at high pressure. A regulating valve adjusted to maintain any desired pressure in the small auxiliary reservoir, giving a uniform pressure for operating.
Page 34 - Absolute Pressure The absolute pressure is obtained by adding the atmospheric pressure to the gauge pressure.

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