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Engineers and engineering Volume 18

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    Available in PDF - DJVU Format | Engineers and engineering Volume 18.pdf | Language: ENGLISH
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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. 1901 Excerpt: ... of A and K, is to be increased VV0 and l-$? respectively. The best economy in the furnaces is attained when the temperature of the gases at the base of the flue is between 550 and 600 F. The amount of coal consumed per horse-power per hour is between 2.5 and 5 pounds, and burned at the rate of from 10 to 30 pounds per square foot of grate surface. Construction. The outer form of brick chimneys is either circular, octagonal, or square in plan, and pyramidal in elevation, the sides having a regular taper of about f inch per foot: the diameter at the base, the inscribed circle of octagon or square, being between one-tenth and one-eighth of the height, the proportion being dependent upon the required stability and ratio of flue area to height. The shell which encloses the non-conducting inner lining should be of good hard-burned brick, of uniform size, laid in cement mortar. To insure circular bondage stretchers should preponderate, say four courses of stretchers to one of headers. It is good practice to bind the shell by iron bands or hoops made of, say, inch by 4 inch bars, securely riveted at joints. These should be built in with the brickwork about 8 feet apart throughout the height of the chimney. The bands are made in sizes to allow the laying of one course of stretchers between the band and the outer surface of the shell, the space between band and inner course of bricks being well filled and packed with mortar. The bands should be so placed as to come immediately above or below a header course. Care must be exercised to secure thorough packing of the joints in the brickwork with mortar, so that the chimney walls be as impermeable as possible to the inflow of external air which would tend to lower the temperature in the flue. The inner or flue lining sh...
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Book details

  • PDF | 106 pages
  • Books Group (Author)
  • (15 May 2012)
  • English
  • 5
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