Cassell's Engineers' Handbook

Cassell's Engineers' Handbook

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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. 1906 edition. Excerpt: ...or Watt. solids Cartwright. 4. The pressure of cold fluids against the vessel containing it..... Perkins. 5. By the combination of two or more of these methods....... --Tredgold. 610. VELOCITY OF FLUIDS FLOWING FROM ATMOSPHERE INTO VACUUM. W = weight per cub. foot of the fluid in lbs. p = atmospheric pressure in lbs. per sq, footj g = force of gravity = 32-2. v = velocity in feet per second. Usually p = 2116-4, then 2x 32-2x 2116-4 = 136,296-16, and approximately Steam of all pressures will rush into a perfect vacuum with a velocity of about 2,000 feet per second, no allowance being made for friction. Steam of 60 lbs. pressure will rush into atmosphere about 1,800 feet per second. 6n. DISCHARGE OF STEAM THROUGH PIPES. The velocity of discharge in pipes is in all cases proportional to the sectional area divided by the circumference; in round pipes this equals onefourth of the diameter, thus: and quantity discharged therefore varies as the diameter3. The pressure lost in discharging a fixed volume of steam varies inversely as the 4th power of the diameter of the orifice. The steam pipe for an engine must be calculated as if constantly passing steam of the maximum velocity required to supply any part of the stroke. With single cylinder engines the maximum velocity may be taken as 1-57 times the mean velocity; and with double cylinder engine, cranks at right angles, maximum = 1-11 times mean. Single cylinder: In all cases allowance must be made for friction, say Area steam pipe sq. inches = L 4800 Another rule (approximate): Diameter steam pipe in inches = Winton's rules: Main steam pipe for 2 cylinders = area of branch pipes combined; Steam pipe to each valve casing = piston area. Another rule: Diameter steam pipe = more

Product details

  • Paperback | 170 pages
  • 189 x 246 x 9mm | 313g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236605624
  • 9781236605627