. Public works . strainer system con-sists of two cast-iron headers,one in each half of the filter,and a series of 2-inch cast-iron laterals, 6 feet lyi incheslong, spaced 7 inches apart,into which are screwed a num-ber of brass strainers, spacedat 6j^-inch intervals. Thestrainers have the trap tubeinlet, which is the essentialfeature of the Continentaltype; hut instead of the per-forated cap. they are providedwith a flat top, turned downslightly at the edges, underwhich the wash water issues from an annular space ofsuch width as to permit only a very low velocity. As itleaves the strainer, th
. Public works . strainer system con-sists of two cast-iron headers,one in each half of the filter,and a series of 2-inch cast-iron laterals, 6 feet lyi incheslong, spaced 7 inches apart,into which are screwed a num-ber of brass strainers, spacedat 6j^-inch intervals. Thestrainers have the trap tubeinlet, which is the essentialfeature of the Continentaltype; hut instead of the per-forated cap. they are providedwith a flat top, turned downslightly at the edges, underwhich the wash water issues from an annular space ofsuch width as to permit only a very low velocity. As itleaves the strainer, the wash water is deflected downwardto the floor into the filter, the purpose of the design beingto admit wash water into the filter bed at such low veloc-ity that there will be no tendency to disturb the graveland also to permit rust scale or other particles, that mayenter the strainer, to pass through it. The inlet tube pro-vides all the restriction of flow necessary to insure uni-form distribution of wash .SECTION OF STR.\IXER.
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Keywords: ., bookcentury1800, bookdecade1890, bookidpublicworks3, bookyear1896
