168 ELECTRIC AUXILIARIES ON MERCHANT SHIPS. 



Steam, Per Shaft Horse-power Hour, All Purposes: 



34,240 



2,500 



= 13.7 pounds. 



Boiler Evaporation. — Estimated for comparative purposes at 13.5 pounds per pound of 

 fuel. With the lesser quantity of steam to generate, however, the boiler efficiency would be 

 improved in actual practice. 



Fuel Consumption: 



34240 

 Fuel per hour, ' ^ = 2,536 pounds = 7.9 barrels. 



Fuel per day, 60,864 pounds = 27 tons. 

 Fuel per day, in barrels =189 barrels. 



Fuel Per Shaft Horse-power Hour: 



2:500= ^-^^ p^"''^"- 



Fuel in Barrels Per Knot: 



79 



Assuming a speed of 10.5 knots, ' = 0.75 barrel per knot. 



The application of high superheat, well within the limits of present-day design, and elec- 

 tric auxiliaries present a very interesting and high economic value in ship propulsion. 



] ELECTRICAL AUXILIARIES. 



Superheat, 200° F. 



Steam Consumption, Per Hour: pounds 



Main turbine, 2,500 horse-power 27,000 



Turbine generator 2,400 



Air ejector 1,000 



30,400 



Note : — 3,000 poimds per hour steam will be extracted from main turbine at about 10 

 pounds gauge to heat feed water. 



Steam Per Shaft Horse-power Hour, All Purposes: 



30,400 



2,500 



^ 12.15 pounds. 



Boiler Evaporation: 



Assumed at 13 pounds per pound of fuel. 



Fuel Consum.ption: 



Fuel per hour = — ^ — = 2,340 pounds = 7.33 barrels. 



Fuel per day, 56,200 pounds = 25.1 tons. 

 Fuel in barrels per day ==176 barrels. 



