. Electric railway review . d. A considerable reserve capacity must be provided if thepipe discharges above the water level of the cistern becauseit must then be of sufficient size to receive the contents ofthe pipe that would flow to it after the admission valve wereclosed. If the pipe were 4,000 feet long, 30 inches in diameterand half-full of water when the admission gate were closed,then 10,000 cubic feet of reserve capacity would be would represent a rise of 8 feet in the water level ifthe cistern were 40 feet in diameter. If the pipe were en-tirely below the water level, a mu
. Electric railway review . d. A considerable reserve capacity must be provided if thepipe discharges above the water level of the cistern becauseit must then be of sufficient size to receive the contents ofthe pipe that would flow to it after the admission valve wereclosed. If the pipe were 4,000 feet long, 30 inches in diameterand half-full of water when the admission gate were closed,then 10,000 cubic feet of reserve capacity would be would represent a rise of 8 feet in the water level ifthe cistern were 40 feet in diameter. If the pipe were en-tirely below the water level, a much smaller cistern could beused. Probably the capacity of the condenser pumps wouldnot be such that the water level in the basin could be alteredas quickly as the controller could operate the valve. So many varying conditions are met in different locali-ties that it is impossible to say which is the most suitablematerial to use for the construction of large depends upon the soil through which the line must be. ro/AGt/js>£/>//>? £//sf Ass^e t] ——- r&ii srrsw r/srss Figure 243-(M-5). run. If the line is of considerable length,—say 100 or morefeet, or of such size that a suction 16 or more inches in diam-eter is required, then the water should be delivered by grav-ity. In many cases the soil close to the waters edge is un-fit for supporting building foundations. This often necessi-tates the placing of a power-house some distance from thewater. The fact that the soil is unsuitable for building pur-poses makes it quite as unsuitable for building a trench andplacing a waterway through it. If the plant is located along-side of a dock much difficulty may be experienced with oldpiles, dock timbers, etc., and since it is desirable to carry thepipe line under water the entire distance such conditionswould hinder careful construction and necessitate installing apump of sufficiently large capacity to care for the increasedamount of seepage through loose groun
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectstreetr, bookyear1906
