. Electric railway review . if the temperature 28fi ELECTRIC RAILWAY REVIEW Vol. XVIII, Xo. 10. of the incoming feedwater is 200 degrees the temperature ofthe feedwater will be raised to 2S0 degrees. This is suffi-cient to throw down the sulphates. The latter calculation isbased on the assumption that for each gallon of water fedto the boiler one gallon of the water in the boiler is circulatedthrough the treating tank. It should be remembered that the smaller the amountof boiler water which is circulated, the more efficient the filterbed becomes. The circulating device shown would not befitted
. Electric railway review . if the temperature 28fi ELECTRIC RAILWAY REVIEW Vol. XVIII, Xo. 10. of the incoming feedwater is 200 degrees the temperature ofthe feedwater will be raised to 2S0 degrees. This is suffi-cient to throw down the sulphates. The latter calculation isbased on the assumption that for each gallon of water fedto the boiler one gallon of the water in the boiler is circulatedthrough the treating tank. It should be remembered that the smaller the amountof boiler water which is circulated, the more efficient the filterbed becomes. The circulating device shown would not befitted with stuffing boxes. It would deliver its water under aslightly greater head than its suction. The parts of thisdevice would be fitted aud its service would be verylight. Manholes should be fitted in the outside end of thetank and a valve, D, provided to shut off the water to theunder side of the filter bed. Hence by opening the blow-offvalve. E. the deposit in the filter bed would be easily dis- News of the Week. charged into the sewer. The gauge, F, shows a difference inpressure above and below the filter bed and thus as the filterbed becomes fouled the pressure gauge enables the operatorto know definitely when it is necessary to blow it out. Aslittle or no heat is applied to the. tank there will be notendency to form scale, the impurities settling in the formof mud. The covering over the tank should be supported eitheron an arch or on T-bars, as shown in Figure 314. When thetank extends to the back wall the wall should have the formof an arch about an inch distant from the tank. The spacebetween the tank and the wall should be closed with asbestosto prevent any air leaking into the furnace. The tank shownin Figure 314 has fully ten times the capacity of that shownin Figure 313, and in addition it also has a filter across itswidest section where the velocity of the water is the least. To apply such a purifier to a Babcock & Wilcox type ofboiler, it may be necessary
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectstreetr, bookyear1906
