174 -^N EI/ECTRICALLY PROPELLED 



generating units are standard pieces of apparatus, generously proportioned 

 for continuous service, which have been developed to meet the exacting 

 conditions of central station lighting service. They are provided with an 

 automatic oiling and water-cooling system and the various attachments 

 which have been proved necessary to insure the required regularity of 

 operation. 



The two units, 1,500 kilowatts, 80 per cent power factor, maximum 

 rating, are located side by side on a specially constructed portion of the main 

 deck in a glass enclosure where suitable ventilation may easily be secured 

 for the generators. Each turbine has an exciter direct connected on the 

 main shaft and the exciter regulation is automatic in its character, only 

 requiring attention during the starting and stopping of the unit. One 25- 

 kilowatt, steam-turbine-driven, independent exciter is also installed for 

 starting up and to furnish lighting for such times as the main units are not 

 in operation. 



Directly below the turbines are the condensers, each of 3,000 square feet 

 surface, with the other necessary auxiliaries, feed pumps, bilge and fire 

 pumps, etc. The condensers are proportioned to maintain a 28-inch vacuum 

 with the 70-degree water prevailing under summer conditions in New York 

 Harbor. The circulating pumps are turbine driven and under normal con- 

 ditions will deliver 5,000 gallons per minute through the condensers. 



The hot-well pumps are on the same shaft as the circulating pumps 

 and have a capacity of 150 gallons per minute against a head of 50 feet. 

 These two pumps are of the centrifugal type and of standard design. In 

 the wings on either side of the condensers are the two air compressors which 

 are also used for air pumps and will, by a special device, discharge either at 

 atmospheric pressure or at 10 pounds gauge. Either unit, as an air pump, 

 has a capacity sufficient to handle both condensers, and the air suction pipes 

 are interconnected. 



The two turbine-driven centrifugal feed-pumps are also located in the 

 wings. Each pump has a capacity of 200 gallons of water per minute 

 against a head of 700 feet, and one unit will be sufficient to feed the boilers 

 except on special occasions. These pumps are run under nearly constant 

 speed conditions and are provided with an unloading device which bypasses 

 the feed-water should the feed-valves be entirely shut. 



Two bilge and fire pumps are also provided, each of 150 gallons capacity 

 and a fresh water tank pump of 50 gallons capacity for the make-up feed 

 from the tanks. Above the feed pumps two open heaters, each of a capacity 

 of 50,000 pounds of water per hour, serve to heat the feed water by mixing 



