. A textbook on the locomotive and the air brake . 23,the reference letters used in thesetwo instances and in Fig. 22 cor-responding. Another arrangement of pipingis also used in which there arethree pipes on each side of thecar instead of two. The ordinaryT piece e is replaced by a doublecenter T connecting the two upperpipes, so that live steam passesfrom pipe d into these other twopipes. The return bend g isreplaced by a three-pipe mani-fold, by which the steam that hasjust come through the two upperpipes f may return through thelower 11 to the center of the car,where a special return T rep
. A textbook on the locomotive and the air brake . 23,the reference letters used in thesetwo instances and in Fig. 22 cor-responding. Another arrangement of pipingis also used in which there arethree pipes on each side of thecar instead of two. The ordinaryT piece e is replaced by a doublecenter T connecting the two upperpipes, so that live steam passesfrom pipe d into these other twopipes. The return bend g isreplaced by a three-pipe mani-fold, by which the steam that hasjust come through the two upperpipes f may return through thelower 11 to the center of the car,where a special return T replacesthe loop L, a pipe leading tovalve u as before. The regulating valve v and thedrain valve it are identical, exceptthat the former has the largerwheel. The train-pipe valve Vhas an extension handle, accessi-ble from the side of the car. Invery cold climates a notch is cut §13 CAR HEATING. 69 in the seat of this valve, so that there Avill be a constant slightdischarge of steam and condensed water, preventing any freez-ing of the train The casting c plays an important part, as it keeps the waterof condensation from freezing in pipe j. The live steam fromthe engine passes through this casting in close proximity to the 70 CAR HEATING. §13 drip pipe j; therefore, as long as there is steam in the trainpipe, the drip cannot freeze. Sometimes it is felt advisable to use a trap to look after thecondensation, instead of having the drip valve u. When suchis the case, the apparatus shown in Fig. 31 is used. The con-densation comes in through i and passes down to the thermo-static cell inside the casing T, whence it escapes when the trapis open. With a view to keeping the drip from freezing, castingD is used; pipes b and i pass clear through D, while a passageinside connects the two lengths of P. Thus, the steam in pipesP keeps the casting, and therefore the drip pipe, always hot; IV is a blow-off valve; its casing Ois provided with a sedimentpocket in which any scale and dirt
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
