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acid air register alkalinity allowable working pressure amount apparatus atomizer Babcock and Wilcox blow valve boiler water bolts bottom burners carbon carbon dioxide cent check valve cleaning coal cocks combustion chamber condensate connected construction corrosion Courtesy Deaerating designed diameter disc efficiency equipment evaporation excess air feed pump feed water fire fire-tube boilers fireroom fitted flame flanged force fuel oil furnace Fusible plugs gage glass gases heaters heating surface hydrogen hydrostatic test increase indicator installed joint latent heat lever liquid marine boiler maximum metal operation orifice oxygen pipe pounds per square pyrometer riveted safety valve salinometer scale Scotch boilers screw shell silver nitrate solution space sprayer plate square inch stays steam drum steam pressure steel stop valve stress superheater tank temperature thermometers thickness tion tube sheet usually vessels viscosity water level water-tube boilers weight welded Wilcox Company