. Electric railway journal . evaporation caused the tubes to get very hotat both top and bottom, the upper part of the tube beingsurrounded only by steam and the bottom suffering fromthe exaggerated effect of the radiant heat upon thecrown sheet or bottom flue sheet. Naturally, this re-sulted in leaking tubes, in addition to the lack of ca-pacity in severe weather or with very long mechanical troubles occurred because the ab-sence of water legs at the bottom of the boiler per-mitted scale to accumulate around the lower portionsof the tubes and because the seams in the boiler she
. Electric railway journal . evaporation caused the tubes to get very hotat both top and bottom, the upper part of the tube beingsurrounded only by steam and the bottom suffering fromthe exaggerated effect of the radiant heat upon thecrown sheet or bottom flue sheet. Naturally, this re-sulted in leaking tubes, in addition to the lack of ca-pacity in severe weather or with very long mechanical troubles occurred because the ab-sence of water legs at the bottom of the boiler per-mitted scale to accumulate around the lower portionsof the tubes and because the seams in the boiler shelldisplayed a distinct tendency to leak on account of thestrains which were set up by the sudden changes intemperature when the boilers were started up or shutdown. In consequence, a new design was developed. This had266 sq. ft. of heating surface and produced an evapora-tion of 1600 lb. of water per hour, the design beingpurely experimental and appearing in only one boileractually placed in service. With the new type, how-. STEAM HEAT BOILERS—INTERIOR VIEWS OF ELECTRIC LOCOMOTIVE CABS SHOWING HEATER AND STORAGE TANK June 10, 1916] ELECTRIC RAILWAY JOURNAL 1081 ever, there was obtained an idea as to the size of boilerneeded to supply the demand for steam to heat thelargest steel passenger coaches used on the railroad,this figure running as high as 250 lb. per car when theoutside temperature approximated 10 deg. Fahr., and200 lb. at 16 deg., so that a ten-car train might easilyrequire 2000 lb. of steam per hour. The experimental boiler suffered from several of thelimitations of the original design in that the absenceof water legs and the existence of very small bridgescaused leaking tubes, while the straight sides of theboiler shell made trouble on account of expansion atthe seams. These difficulties were, in fact, magnifiedover those that existed with the smaller boiler whichhad preceded the experimental design, and as a resultthe boiler used on main-line engines was designed
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