The Power Plant

The Power Plant

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 edition. Excerpt: ...102. By the use of this diagram for a given condition, the size and number of stages of the pump and the horsepower of the driving unit may be determined directly. In plotting these values for convenient reference, the guarantees offered by manufacturers, test results, and actual installations were included in the considerations. The average performance of a number of pumps of different makes was determined, so that the values represent fair commercial practice. In using the diagram, find the capacity on the lower scale; then for a condition of 1000 gallons per minute against a total head of 350 feet, the following is found: Above the capacity a 6-inch pump is indicated, and following to the line of head gives three stages. From this point of intersection to the power scale 145 brake-horsepower is shown as the required rating of driving unit. The nearest commercial size above this would be installed, which means a 150-horsepower electric motor or steam turbine. Pressure Regulators.--Direct-acting steam boiler feed pumps should be equipped with automatic pressure-regulators to prevent the accumulation of excessive pressure in the pumps and feed piping in case the feed valves to the boilers are all shut off before the feed pumps are shut down. This device is decidedly convenient, since when it is used the feed water can be regulated at the individual boilers quite independently of the operation of the feed pumps. CHAPTER XI WATER SUPPLY--PUMPS, TREATMENT, AND HEATING Classification of Pumps.--The proper mechanical handling of water in manufacturing plants comprises an important factor in the over-all efficiency, and frequently a change in pumping methods will effect a very considerable economy in energy and in steam and fuel consumption. A...show more

Product details

  • Paperback | 132 pages
  • 189 x 246 x 7mm | 249g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236889908
  • 9781236889904