3bjlaaaayaaj

3bjlaaaayaaj

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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. 1913 edition. Excerpt: ...deals with very light castings and requires extra hot metal. A separate furnace is run for each molder and the metal is held in the furnace until he is ready for it, even though the metal has been ready to pour previously. The coke furnaces in the test were run faster than the normal rate, as shown by the figures for reply 16 in subdivision 1 of the table. The other replies in subdivision 1 lead to the belief that with a No. 60 crucible, even on work requiring such hot metal 40 pounds of coke per 100 pounds of metal should be sufficient. The smaller crucible (No. 40) will give a lower fuel efficiency, and as hotter metal is required, the figure of 55 pounds per 100 shows a fair fuel efficiency for coke furnaces. The oil consumption shown in the tests, averaging 5.5 gallons, is high. The results presented in subdivisions 16 and 18 show that for a No. 60 crucible the normal figures run from 1.7 to 3.3 gallons. Allowing an increase in the ratio of 40 to 55 over this figure of 3.3 gallons oil consumption, on account of the use of a smaller crucible and the need for hotter metal, the oil furnaces should not have taken over 4.5 gallons per hundredweight at the outside, if run at full capacity. Reply 17, subdivision 10.--In tabulating the pounds of metal per furnace tender per hour for rolling mills, it was impossible to keep the same basis of comparison as in foundries melting metal for sand casting. In such a foundry, the furnace tender seldom has anything to do with the metal after it has been taken from the fire; that is, after the pot has been pulled from a pit furnace or the metal poured into the ladle from other types. The metal goes into the hands either of the molder and his helpor, who carry it to the molds by hand or by crane and pour off, ..show more

Product details

  • Paperback | 268 pages
  • 189 x 246 x 14mm | 485g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236607171
  • 9781236607171