. Railway age gazette . .61 5 1_0 6 140 7 160 8 180 9 200 10 210 .99 11 220 12 250 In practice, with injectors working full, passing water at 140deg. F. from a tank temperature of 60 deg. F., an increase of110 deg. by pre-heat, delivering the water at 250 deg. is prob-ably as high as can be obtained, the final delivery temperatureincreasing to a limited degre
. Railway age gazette . .61 5 1_0 6 140 7 160 8 180 9 200 10 210 .99 11 220 12 250 In practice, with injectors working full, passing water at 140deg. F. from a tank temperature of 60 deg. F., an increase of110 deg. by pre-heat, delivering the water at 250 deg. is prob-ably as high as can be obtained, the final delivery temperatureincreasing to a limited degree with the increased tank and in-jector delivery temperature. To offset in a measure the heat losses incident to boiler feedingthrough the medium of the injector, we must consider the prob-ability of detracting to a certain extent from the tractive powerof the locomotive, at least on heavy grades, by any mechanicalboiler feed which would necessarily be a pump. In modern practice, with boilers operating with steam at 200. Sfcr/av >r-/r Fig. 1 lb. the metal parts are subjected to high temperature, causingextensive expansion throughout; water suddenly introducedinto the boiler at very low temperature causes extreme suddencontraction of the bolts and sheets. The nearer the temperatureof the feed water to that of the steam, the less injury will resultto the boiler. From a boiler upkeep standpoint alone, pre-heatis of much value and is worthy of careful consideration, espe-cially in view of the fact that the said pre-heat is a utilized New Orleans Great Northern is equipping locomotiveswith a device gotten up in its shops for the purpose of pre- heating the feed water. The construction and design of thisprc-heater is simple, consisting of an auxiliary exhaust heater inconnection with a front-end or smoke-box heater operated intandem. The auxiliary heater consists of a cylindrical 1, 8 to 10 feet in length, containing a number of coppertubes running lengthwise
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1913
