Mechanical Contracting & Plumbing January-December 1908 . Series of Bins in Washington FilterSystem. concrete city covering more than 29acres, are the massive concrete sandbins, 29 in number, which form a partof the sand washing system. These bins are used for the storage ofsand after it has been washed and be-fore it is returned to the filter the washer the sand is carried,suspended in water, through pipes andinto the bins. The proportion usually flowing in is four parts water and onepart sand. The sand sinks to the bot-tom and the water accumulates untilthe bin is half full. At thi
Mechanical Contracting & Plumbing January-December 1908 . Series of Bins in Washington FilterSystem. concrete city covering more than 29acres, are the massive concrete sandbins, 29 in number, which form a partof the sand washing system. These bins are used for the storage ofsand after it has been washed and be-fore it is returned to the filter the washer the sand is carried,suspended in water, through pipes andinto the bins. The proportion usually flowing in is four parts water and onepart sand. The sand sinks to the bot-tom and the water accumulates untilthe bin is half full. At this level thewater overflows through a pipe, andcontinues to overflow until the sandreaches the outlet. The gate at the first. Immense Sand Washing Bin. outlet is then closed, and the process isrepeated by the use of a second outletnear the top of the bin. Each bin holds250 cubic yards of sand. The bins are of massive constructionand tower 32 feet into the air. The di-ameter, outside measurement, is 23 feet6 ins., and at the top the outside wallis 9 ins. thick. They are supported oncircular concrete foundations, carriedbelow the frost line. Their greatweight, to which is added the weight ofthe wet sand, is carried partially on theoutside wall and partially upon threecircular arches. These arches intersectat the centre of the structure, and leavea space underneath large enough for a2-horse cart to enter. At the intersec-tion of the arches there is a heavilyconstructed gate, through which theclean sand is allowed to pour into thewagons. From the wagons the sand isdumped through manholes upon revolv-ing chutes, which scatter it quite evenlyover the surface of the filter. At otherfilters, where there are no concr
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