Duty and Capacity Tests of Worthington High Duty Pumping Engines on Water Work and Pipe Line Services

Duty and Capacity Tests of Worthington High Duty Pumping Engines on Water Work and Pipe Line Services

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 edition. Excerpt: ...with a thin edge; so that exactly equal tankfuls of water could be discharged, as required, into a cistern below, whence the donkey engine pumped the water to the boilers. The exhaust steam from the donkey engine was passed into the cistern, whence it drew the feed water, being completely condensed and heating it to a certain extent. The whole of the heat rejected by the donkey engine in its exhaust steam was therefore returned to the boiler. The precise amount of heat, corresponding to the work done in pumping the feed into the boiler, is converted into work. None is rejected. In the present instance the donkey pumped the feed from the mains at a temperature of 50 degrees, instead of from the hot-well at about 70 degrees, so that every pound of water had to be raised 20 degrees more than it would have been if taken from the hot-well. This occasions a loss, as will be shown later on. The jacket drains returned to the boilers, so that the feed water measured represents the amount of steam passing through the cylinders only, exclusive of that condensed in the jacket. The principal object of the trial was to determine the coal consumption, so that it was thought desirable to disturb the normal conditions of working as little as possible. The contents of the measuring tank were ascertained by weighing twice, with reversed arms of the balance, and the two weighments, which were made.by about 90 pounds at a time, agreed to 1 ounce. The time of delivering each tankful of feed water, as well as the total number used, was recorded by observers. To check the same, a counter was provided, worked by a float, which rose and fell with the water in the measuring tank. The measurement of the stroke of the engine, which, as I have said, is not limited by any...show more

Product details

  • Paperback | 70 pages
  • 189 x 246 x 4mm | 141g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236611896
  • 9781236611895