File:Operation of trains and station work and telegraphy (1916) (14735708426).jpg

Identifier: operationoftrain02prio (find matches)
Title: Operation of trains and station work and telegraphy
Year: 1916 (1910s)
Authors: Prior, Frederick John, 1858- (from old catalog) comp
Subjects: Railroad trains Railroads
Publisher: Chicago, F. J. Drake & co
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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to proper circulation. Therefore all air, dirt andscale should be expelled from the pipes and they shouldthen be filled with water free from air bubbles, as follows: All draw-off or drain cocks in the circulation pipingshould be opened, the safety valve removed, and thecombination cock kept closed. Then a half-inch pipeshould be run from the topmost tapping in the expansiondrum as shown at A A, Figure 7. This piping must beabsolutely tight. It should be extended down outsidethe car and connected to the upper end of a coil or pipein the barrel or tank, the latter being put as close aspossible to the car. Coil B should be about 2 inchessmaller in diameter than the inside of the barrel andshould be coiled as closely as possible to insure a largeamount of heating surface. Near the lower end shouldbe a tee (T) fitting shown at a (see (b)) and an anglevalve b should be connected to the tee (T) as indicated.A metal strainer c should be attached to the angle valve HEATING AND LIGHTING CARS 53
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FIG. 7. ARRANGEMENT ILLUSTRATING METHOD OF FILLINGTHE HEATER CIRCULATION SYSTEM. 54 RULES FOR MOVEMENT OF TRAINS to prevent salt or any other solid matter from enteringthe pipes. The lower end of the coil should be con-,nected with the Globe valve e. The water, if salt, shouldbe sufficient to fill the pipes without drawing down tooclose to the surplus salt at the bottom and not too nearto the strainer. The water level should never be lessthan four inches above the strainer. One hundred feetof IJ4-inch piping will hold about seven and a half gal-lons of water; therefore, if the number of feet of circu-lation piping is known the quantity of water can easilybe calculated. As a precaution an excess quantity ofabout a third should be provided. A barrel of the ordi-nary size will usually hold enough water to fill the heaterin a standard car; and the same quantity suffices forone-half of a double circulation heater, but to guardagainst taking air into the pipes care should be takento have mo

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