. The Street railway journal . is 16-32 in. The whole ofthe steel used in the manufacture of these boilers was sub-jected to rigid tests by the government inspector beforebeing passed. The following chemical analysis was speci-fied. Carbon, between and Phosphorous, not to exceed Manganese, not to exceed Silicon, not to exceed Sulphur, not to exceed The ultimate tensile stress of the plates is between 55,000and 65,000 lbs. per sq. in., with an elongation of from 24 to32 per cent in 8 ins. The hydraulic test pressure for thedrums was 250 lbs. per sq. in., and that f
. The Street railway journal . is 16-32 in. The whole ofthe steel used in the manufacture of these boilers was sub-jected to rigid tests by the government inspector beforebeing passed. The following chemical analysis was speci-fied. Carbon, between and Phosphorous, not to exceed Manganese, not to exceed Silicon, not to exceed Sulphur, not to exceed The ultimate tensile stress of the plates is between 55,000and 65,000 lbs. per sq. in., with an elongation of from 24 to32 per cent in 8 ins. The hydraulic test pressure for thedrums was 250 lbs. per sq. in., and that for the sections andmud drums 300 lbs. per sq. in. The working pressure is160 lbs. per sq. in. The main flues, which are of brick, are arranged belowand at the back of the boilers, one on each side of theboiler house basement, and access is provided to them bvdoors in each cross alleyway between the boiler founda-tions. The bottom of the flues has been kept level withthe floor to facilitate cleaning. The soot is removed by the. April, 1898.] STREET RAILWAY JOURNAL. 205 conveyor to the ash bunker for barging away. Each mainflue is complete in itself, a separate economizer and chim-ney shaft being provided for both. A cross-flue is ar-ranged between the boilers and economizers in addition tothe ordinary economizer by-pass flues, to enable each flueto work into either economizer or chimney, as may be de-sired. The two economizers, each composed of 384 tubes,are of the Green type. The chimney shafts are of steel, lined with firebrick, andare 10 ft. in diameter and 200 ft. high, standing on a brick-work base 26 ft. high from flue level, making the totalheight of the shaft 226 ft. The system of piping is at once very simple and conven-ient, as will be seen from the general lay-out of the sta-tion. Any engine can be fed from any boiler, while thelength of steel pipe is kept as short as possible. The ar-rangement minimizes the risk of breakdown, and providesthe maximum of interchangeabi
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
