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The Principles and Practice of Colliery Ventilation; Being a Treatise on the Laws Governing the Motion of Air in Mines, and an Explanation of the Furnace and Vacuum Fan Systems of Ventilation

The Principles and Practice of Colliery Ventilation; Being a Treatise on the Laws Governing the Motion of Air in Mines, and an Explanation of the Furnace and Vacuum Fan Systems of Ventilation


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: ever must the regulators be placed in the intake currents, or Downcast Shaft as the air being drawn out of the pit at a greater speed than it enters it, a depression will be caused that may produce a blower of gas. A duplicate engine must be attached ready for use in case of a breakdown, and the engine must be properly governed to run steadily at any speed. Care must also be taken to construct a drift to the fan from the Upcast Shaft, so that in the event of an explosion, the fan itself and its gear may not be damaged. There are so many forms of Centrifugal Ventilators and Vacuum Fans, that a description of all would be impossible; the following Chapter will give the rules (expressed arithmetically) to find the cubic feet of air per minute required to ventilate the pit, and the fan must be guaranteed by the manufacturer to yield this result with a fair margin, in case of emergency. Phosphor bronze bearings in the fan itself will be found an economy, and great attention should be paid to the trimming of the oil cups, the firing of the engine, and the air doors in the pit, or the fan is no economy over the furnace. In designing Centrifugal Fans, the following rules may be observed for proportions. D = diameter of Fan, V = velocity in feet per second of the tips of the Fan blades. P ? pressure in Ibs. per square inch. V = /p x 97300 IT P = 97300 Length of Vane = ? Diamater of Centre = ? Width = ? Eccentricity of Fan = ? 4 ' 10 CHAPTER III. The Laws Of Chemical Combination As Applied To Combustion. In calculating the velocity and quantity of the air current, the first thing we shall require to know is the rule for ascertaining the quantity of air required for the complete combustion of the principal form of fuel; and it will be noted that the met...



Product Details
  • ISBN-13: 9780217132787
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 20
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 0217132782
  • Publisher Date: 07 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 54 gr


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The Principles and Practice of Colliery Ventilation; Being a Treatise on the Laws Governing the Motion of Air in Mines, and an Explanation of the Furnace and Vacuum Fan Systems of Ventilation
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