. Electric railway journal . ain in-take is an in-clined trashrack and in theintake to eachpump pit is atraveling screenmade by theChain Belt En-gineering Com-p a n y. Eachscreen slides inguides formedof angle ironsmounted in the concrete walls of the divided grab-bucket derrick is installed near the intake forthe purpose of clearing it of the debris which at timesaccumulates in large quantities. The motors driving the pumps are of the inductiontype, with slip rings to permit the insertion of start-ing resistance in the secondary circuit. Their syn-chronous speed is the rated speed of
. Electric railway journal . ain in-take is an in-clined trashrack and in theintake to eachpump pit is atraveling screenmade by theChain Belt En-gineering Com-p a n y. Eachscreen slides inguides formedof angle ironsmounted in the concrete walls of the divided grab-bucket derrick is installed near the intake forthe purpose of clearing it of the debris which at timesaccumulates in large quantities. The motors driving the pumps are of the inductiontype, with slip rings to permit the insertion of start-ing resistance in the secondary circuit. Their syn-chronous speed is the rated speed of the pumps, , and their capacity 425 hp. each. They are sup-plied with power through a bank of three 200-kva.,self-cooling, oil-cooled transformers, mounted on abracket-supported balcony behind the motor house. Inaddition there is a bank of three 150-kva. transformersfor emergency use. These lower the voltage of thethree-phase current from the power house from 11,000to 440. The switchboard controlling the motors and. Section A-ADetails of Sealing Well power circuits is located in the motor room near thewall next to the transformer balcony. To facilitate repairs the motor room is equipped withan Alfred Box traveling hand-operated crane. Rotating Parts Hang from One Bearing The rotating element of a pump-motor unit, com-prising motor armature, shaft and pump impeller, andweighing from 5,000 to 6,000 lb., is supported by onebearing of the thrust type, located on the top ofthe motor frame. This bearing is water-cooled. Steadybearings, as shown in one of the reproduced drawings,are provided for the 5-in. shaft at several levels. With the present arrangement of motor-pump unita pump can be put into action in less than one quick start is possible because all that is neces-sary is to throw in the motor switch. The pumps arealways primed because they are located below low-waterlevel and, as there is a check valve in each dischargepipe line, no manual operation of a
Size: 1032px × 2420px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
