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Home > Art, Film & Photography > Power, Heating and Ventilation Volume 2; Power and Lighting
Power, Heating and Ventilation Volume 2; Power and Lighting

Power, Heating and Ventilation Volume 2; Power and Lighting


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About the Book

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. 1909 Excerpt: ... varies with the distance from the open end. In order for a liquid to flow through a pipe there must be a certain pressure or head at the inlet end. The total head causing the flow is divided into three parts, as follows: First, the velocity head, the height through which a body must fall in a vacuum to acquire the velocity with which the liquid enters the pipe; second, the entry head, that required to overcome the resistance to entrance into the pipe; third, the friction head, due to the frictional resistance to flow within the pipe. In the case of long pipes and low heads the sum of the velocity and entry heads is small, compared with the friction head, and in ordinary work may usually be neglected. Friction Head.--Table XXII. gives the friction head for different velocities of flow through pipes of different diameters, and the corresponding number of gallons discharged per minute. The friction heads are given in pounds per square inch, and represent the pressure required to force water at the given velocity through a horizontal pipe 100 feet in length. As the frictional resistance is proportional to the length, the friction head for any other length of run can be found by multiplying the number given in the table by the given length divided by 100. That is, for 1,000 feet, multiply by 10, and for 50 feet, multiply by 0.5. The use of Table XXII. can best be shown by one or two practical illustrations. Example.--It is desired to circulate 250 gallons of water per minute through a heating main 500 ft. long, at a velocity of about 12 ft. per second. What size pipe will be required, and what pressure per square inch must be exerted by the pump to overcome the frictional resistance? Looking in the table along the line corresponding to 250 gallons we find that ...


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Product Details
  • ISBN-13: 9781159419257
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 44
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1159419256
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 95 gr


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