. Electric railway review . ment of the ma-chinery, dams, etc., and include a few notes on the paralleloperation of plants, regulation and cost of electrical powertransmission. June S, 1907. ELECTRIC RAILWAY REVIEW PIPING AND POWER STATION SYSTEMS—XLI I. BY \V. MORRIS, M. E. City Water Connections to Boiler Feed Main—Class K 5. If the power station has its own water supply the citywater supply should not be connected with the boiler feedmain. The pressure carried on a city main is not sufficientfor boiler feeding. This necessitates joining the city waterconnection to the auxiliary feed mai
. Electric railway review . ment of the ma-chinery, dams, etc., and include a few notes on the paralleloperation of plants, regulation and cost of electrical powertransmission. June S, 1907. ELECTRIC RAILWAY REVIEW PIPING AND POWER STATION SYSTEMS—XLI I. BY \V. MORRIS, M. E. City Water Connections to Boiler Feed Main—Class K 5. If the power station has its own water supply the citywater supply should not be connected with the boiler feedmain. The pressure carried on a city main is not sufficientfor boiler feeding. This necessitates joining the city waterconnection to the auxiliary feed main. Here the supply canbe used under a low pressure without interfering with theregular boiler feeding. If the plant is run with city wateronly then this latter connection should be used, since itenables the operator to wash or fill boilers without runningany pump. Figure 283-(K5—1) shows an auxiliary main arranged sothat under ordinary conditions it will be supplied with city C/rr- W/rre-*: &s*//-£-/sr*py y^TV/vr. /^•/■SW Figure 283-(K5—1). pressure as far as the pumps, thus making this water avail-able for wetting down ashes, etc. When pump No. 2 is sup-plying the auxiliary main with water under high pressure foroperating turbine tube cleaners there will be no water at highpressure available as far as valve A. This, however, wouldnot be a serious objection in most boiler rooms. To avoiddamage -to the low-pressure city lines, if an operator shouldstart the pump without closing the valve, A, a check valve, B,should be fitted in the low-pressure main, as shown. Feedwater can in an emergency be obtained by meansof a fire hose if the city fire plugs are properly located. Theuse of fire hose is, however, poor practice, as it is trouble-some to make the connections and shows that the city servicehas been overlooked. City Water to Pump Suctions—Class K 6. Plants which have city water available should have thecity service connection of sufficient size to feed all the boi
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectstreetr, bookyear1906