Compressed Air Volume 8

Compressed Air Volume 8

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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. 1903 edition. Excerpt: ...of the suction pipe causes the water to rush into the latter. The suction valve then closes and on the return stroke the discharge valve opens the piston, forcing the water to a higher level. In the air-lift pump the pressure of the atmosphere is not removed from the surface of the water in the pipe, as it is in the suction pipe of an ordinary pump. We have the atmospheric pressure on the surface of the water outside of the well and also in the pipe. The short columns of air previously mentioned act as pistons in the air-lift pump, the propelling force being that due to the difference in specific gravity between air and water. The specific gravity of a solid is the difference between its weight and the weight of a like volume of distilled water at 39.2 degrees F., the weight of the water generally being represented by unity, or 1. Taking the weight of water as I, the specific gravity of air is.0012. Air beinc elastic and compressed to 3, 4, or 5 atmospheres, as the case may be, when liberated under the water is found to be very buoyant, and, as expansion is confined to the limits of the piRe, it forms a large bubble and carries the water above it to the surface, the air column becoming longer as it ascends on account of the removal of the weight of water above it, thus allowing the air to continue to expand, until finally it flows from the pipe a little above atmospheric pressure. It will be seen that the water which is removed by the air lessens the weight of water in the pipe, or, in other words, the weight of the column in the pipe is less than that of a similar column outside of it. This in turn causes the water to rush in at the bottom, because of the greater weight of the column on the outside. Other bubbles are formed, thus causing...show more

Product details

  • Paperback | 232 pages
  • 189 x 246 x 12mm | 422g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236739027
  • 9781236739025