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Papers and Reports Relating to Minerals and Mining

Papers and Reports Relating to Minerals and Mining


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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. 1899 Excerpt: ...being wasted in this manner; and, in fact, a brisk flow of air into the fire-zone of the pit is noticeable. An objection frequently urged against compression ventilation--namely, that by partially ventilating the surrounding strata it increases the danger of pit-fires--seems to the author to apply equally to ventilation by exhaustion; and certainly the fire risk in the two pits now in question has diminished since the introduction of the former system. Another objection raised is that the fans must usually be mounted underground; but this plea is only justified when the downcast shaft and intermediate channel leading to the intake of the fan are not themselves thoroughly fireproof. In cases, however, where all the fittings except the wooden cage guides are of iron, and consequently a shaft fire is as good as impossible, he believes no disadvantage can accrue from the ventilator being situated in the workings. In an outbreak of fire in a pit it is of the utmost importance that the ventilator should be easy of access, since circumstances may arise that render it imperative to either stop the fan or reverse its motion. For this purpose the arrangement of the ventilators close to the winding-shafts must be regarded as the most suitable plan, since their accessibility is greatest in this situation. Exhaust fans, on the other hand, are frequently erected in air-shafts at some distauce away from the windingshafts, and therefore cannot be got at so quickly; and when fitted in winding-shafts these fans must be situated underground, unless provision be made for keeping the shaft closed. This mode of arrangement must be classed as dangerous, owing to the inaccessibility of the ventilators during an outbreak of fire. Another advantage of the compression system is that, ..


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Product Details
  • ISBN-13: 9781130213416
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 322
  • Spine Width: 17 mm
  • Width: 189 mm
  • ISBN-10: 1130213412
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 576 gr


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