File:A textbook on the locomotive and the air brake (1901) (14572294248).jpg

Identifier: textbookonlocomo02inte (find matches)
Title: A textbook on the locomotive and the air brake
Year: 1901 (1900s)
Authors: International Correspondence Schools
Subjects: Locomotives Locomotive boilers Locomotives Railroad cars
Publisher: Scranton, Pa., International textbook co
Contributing Library: Northeastern University, Snell Library
Digitizing Sponsor: Northeastern University, Snell Library

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on handle that reaches above the top of the barrel. View(6) shows the lower portion of the coil, with the angle valve andstrainer in position, as seen if viewed from a position oppositethe valve e. Fill the tank with the brine or fresh water (brine preferred)with which it is desired to fill the pipes. The brine shouldcontain a considerable amount of undissolved salt over andabove that which the water will take in solution. The waterin the barrel must, of course, be suflEicient to fill the pipes with-out drawing the level in the barrel down too near the strainer.At no time should the water level be less than 4 inches abovethe strainer. One hundred feet of 1^-inch pipe contains about7^ gallons of water; so, if the number of feet of circulationpiping is known, the water necessary is easily calculated. Anexcess of at least one-third should then be allowed for as ameasure of safety. An ordinary barrelful of water will sufficefor all ordinary cars, or for each half of a double-circulation 1
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12 CAR HEATING. § 13 car, but it is well to have an extra amount on hand to use incase the water level in the barrel should be lowered too nearthe strainer, otherwise air might be taken into the system. Close the angle valve h and open the globe valve e. Connecta steam hose to the draw-off cock furthest from the expansiondrum, and blow about 25 or 30 pounds of steam into the pipes.As fast as it issues freely and in full volume from each opendraw-off cock, close that cock. In a very few minutes everyfoot of the heater pipes will be full of live steam, as will beindicated by the temperature of the pipes, and the steam willforce its way up into the expansion drum and out through thecoil B and the globe valve e. It carries with it the air that hascollected in the pipes, and this, together with the water of con-densation, will be discharged from the globe valve e. If livesteam escapes with the water, close the valve a little, or untilonly water and air escape. After the air is expelled, t

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