. The Street railway journal . ock friction, loss by eddies and leakage. Inthe high-efficiency pumps these diffusion vanes play an im-portant part in gradually changing the velocity to pressurehead without loss by shock. These diffusion vanes are areplica of the guide vanes of a water turbine and are respon-sible for the name assumed by such pump as turbine centri-fugals. With the improvements the efficiency of the centrifugalpump has steadily advanced until a figure of 75 per cent hasbeen shown by creditable tests, with the result that there hasbeen an enlarged field open to its use and a dem
. The Street railway journal . ock friction, loss by eddies and leakage. Inthe high-efficiency pumps these diffusion vanes play an im-portant part in gradually changing the velocity to pressurehead without loss by shock. These diffusion vanes are areplica of the guide vanes of a water turbine and are respon-sible for the name assumed by such pump as turbine centri-fugals. With the improvements the efficiency of the centrifugalpump has steadily advanced until a figure of 75 per cent hasbeen shown by creditable tests, with the result that there hasbeen an enlarged field open to its use and a demand created forsuch pumps capable of delivering against comparatively highheads. For such service an ordinary centrifugal pump re-quires either an extremely high rate of rotation for the runner IOOO STREET RAILWAY JOURNAL. [Vol. XXVI. No. 23. or a shell of an impractical diameter, and in either case, dueto the increased hydraulic friction at high speeds, there willbe a serious loss of efficiency. The multiple-stage centrifugal. HIGH-SPEED, DOUBLE-ACTING ENGINEDIRECT CONNECTED TO A CENTRIFU-GAL PUMP CENTRIFUGAL PUMP WITH HAND PRIMERFOR STARTING UP obviates both these disadvantages and can now be built for allheads up to 2000 ft. A multiple-stage pump is primarily aseries of single-stage pumps mounted side by side and with * it ill \- ■in1! iiiii«>** ■■ii 1 iifi-i i Win nil t ■ ■ SiEU <w^ i <<*■■ 111 ■ 1^^ == m ■ ^1 readily adapted for direct connection to high-speed a most compact and effective unit is provided with acapacity far exceeding a direct-acting pump of the sameweight. For general service the centrifugal pump seems a well nighideal piece of apparatus. Commercially considered, its firstcost is low, its maintenance expense a minimum, and its ef-fective life a long one. Its operation is too simple to require skilled attendance, and its propertyof handling liquids of a corrosivenature and containing large quanti-ties of solid mat
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
