Platts Power Volume 45

Platts Power Volume 45

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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. 1917 edition. Excerpt: ...are negligible, but in belt wheels they must be carefully considered. The cylinder must be thoroughly cleaned in the ports..Steam and exhaust chests and bore are blown out with steam or air. All core sand left in the casting or grit blown into it in transportation or erecting must be removed. The throttle valve should be put on, making the engine ready for the pipe connections to the boilers. The piston, rod and crosshead should be put in and lined up. The guide should have marks at each end to indicate the length of the stroke and the clearances in the cylinder by bringing a mark on the crosshead line on line with them, as in Fig. 184. This must be verified by moving crosshead and piston from one end to the other until the piston strikes the heads. If the piston rod has a threaded end, it should never be screwed into the crosshead with pipe tongs; that would leave deep and ineradicable marks on the rod and ruin it. A stout rope should be doubled and wound a sufficient number of times around the rod to give it a good hold, and a bar inserted in the loop; then, using the rod as fulcrum, it is comparatively easy to turn the piston rod. A piece of soft sheet copper inserted between bar and rod will protect the latter from retting bruised. The arrangement is shown in Fig. 185. The common practice is to give Corliss engines from i-to-in. clearance at each end of the cylinder. This is too much and results in a loss of steam. Besides, the faces of the pistons and cylinder heads arc often not properly machined: in some engines they are left rough, with curved surfaces as shown in Fig. 18(1. The reason for all this, of course, is to cheapen the product. Large clearances and rough surfaces are detrimental to good steam economy. The loss more

Product details

  • Paperback | 848 pages
  • 189 x 246 x 43mm | 1,483g
  • United States
  • English
  • black & white illustrations
  • 1236939956
  • 9781236939951