Pumps in the Power Plant

Pumps in 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. 1918 edition. Excerpt: ...stroke is reduced in direct proportion; the gain in the number of strokes in any given time will not make up for the reduced length of stroke for time consumed at tho end of each stroke in stopping and starting will be the same, so that while the number of strokes may be increased, the time lost at the end of the stroke is also increased in the same ratio, thus cutting down the actual time the piston is in motion and its pumping capacity. The cause of short stroke in duplex pumps is the admission of steam before the piston has finished its stroke; in other words, its steam valve has been acted upon too early, and this can be remedied by increasing the lost motion, thus delaying the motion of the valve. Friction of piston rod packing will also cause short stroking, and is remedied by a more elastic packing, which will give a tight joint with less gland pressure. Cushion Pumps of the larger sizes having heavy reciprocating parts, which accumulate considerable momentum during a stroke, must be provided with some means for overcoming this momentum or the piston will strike the cylinder head. One of the common means for providing this cushion is the double port arrangement. An illustration of this construction is given in Fig. 34; the operation is as follows: Steam is admitted through the outside port, k, driving the piston to the other end of the cylinder, exhaust passing from the cylinder to the exhaust port through the inner port at the other end until this port is covered by the piston; what exhaust steam then remains is compressed in the clearance space and the steam port, absorbing the momentum of the piston until it comes to rest without striking the head. When the steam valve is shifted, steam enters the head end of the cylinder and...
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Product details

  • Paperback
  • 189 x 246 x 2mm | 73g
  • United States
  • English
  • black & white illustrations
  • 1236977823
  • 9781236977823