. Electric railway journal . ion for this extension will consist ofeight additional boilers, similar to the original installation, and operating at a ratio of 10 sq. ft. during the peak and havinga large number of boilers banked all the rest of the day. Each boiler is equipped with a superheater built on the topof the boiler and in reality an integral part of the boiler. Thissuperheater has 25 per cent of the total boiler heating surface,and is used as an economizer through which the gases passafter leaving the water heating surface of the boiler. Atnormal rates of operation approximately 60 d
. Electric railway journal . ion for this extension will consist ofeight additional boilers, similar to the original installation, and operating at a ratio of 10 sq. ft. during the peak and havinga large number of boilers banked all the rest of the day. Each boiler is equipped with a superheater built on the topof the boiler and in reality an integral part of the boiler. Thissuperheater has 25 per cent of the total boiler heating surface,and is used as an economizer through which the gases passafter leaving the water heating surface of the boiler. Atnormal rates of operation approximately 60 deg. of super-heat is obtained from this source. In addition to this theeight new boilers which are to be installed and from whichthe high-pressure turbines will be supplied will be equippedwith Foster superheaters which will deliver the steam to theturbines at 150 deg. above the temperature of It has been found by test that the various engines, non-con-densing, will have their maximum efficiency with a total ca-. February i8, ELECTRIC RAILWAY JOURNAL. 295 pacitj of about 40CO kw in excess of the rating of the gene-rator, and as the generators will readily operate without ex-cessive heating with this additional load the total station ca-pacity is considered to be 63,000 kw. The real estate occupiedby this installation is 143 ft. x 240 ft. So far as the powerplant proper is concerned, there is therefore 1 kw installed foreach sq. ft. of ground area. A feature of this installation which, in its construction, hasinvolved much study is the low-pressure piping between theengines and the turbines into which they exhaust. To makethis piping as short as possible and to avoid unnecessary bendsit was decided to carry it overhead, and the last end of thispipe, next to the separator, was made 66 in. in diameter inorder to reduce the velocity of the steam sufficiently to per-mit proper action on the part of the Hoppes separator. Thisseparator is 10 ft. in diameter a
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