Canadian New First, Second & Third Year Examinations for Engineers & Firemen

Canadian New First, Second & Third Year Examinations for Engineers & Firemen

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: ...valves leaking; air piston rod packing leaking or too tight; choked air passages or choked (lischarge pipe; too small a main reservoir for the number of cars in train. Ques. 8: If a pump runs very hot on the road, how will you proceed to cool it? Ans.: First, would reduce speed of pump and look for leaks in the train line. Second, would examine packing around the piston rod to make certain it is not too tight or in bad condition. Third, would see that main reservoir is properly drained. 'Fourth, would look to lubrication and would put a small quantity of good oil in the air chamber; would then run the pump slowly until it cooled down. If it continued to run hot would report it at end of trip. Ques. 9: If the pump stops, how can you tell whether the trouble is in the pump or in the governor? Ans.: If the red gauge pointer has fallen below _ the figure at which the pump governor is adjusted, and pressure is escaping from the small air vent port in the governor just below the diaphragm valve, it denotes that the governor is defective, permitting pressure to enter and hold the steam valve closed. If this port is open and no air escapes then it would denote that the trouble was in the pump. Ques.10' State the common causes for the pump stopping. Ans.: Loose nuts on the piston rod in the air cylinder; a broken reversing valve i'od; a rod disengaged from the reversing plate; a loose reversing valve plate; bad packing rings on the main valve piston (or, if an 8-inch pump, the reversing piston)' or a dry pump. Ques. 11: Under' what circumstances will a pump compress air in but one direction? Ans.: With either filischarge valve broken and held off its seat. Ques. 12: How will defective air valves aEect the operation of the pump? more

Product details

  • Paperback | 46 pages
  • 189 x 246 x 3mm | 100g
  • United States
  • English
  • black & white illustrations
  • 123688874X
  • 9781236888747