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Sand Filter
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Features : • Higher specific velocity. • Raw water can be used for backwashing the filter. Advantages : • Higher specific flow rate than conventional down flow filters thereby saving on Space & cost • Very little maintenance required • Lower backwash water requirement. • In most cases, raw water can be used for backwash. Applications • The Multigrade sand filters filter is an ideal choice for all applications where a conventional sand filter is used. • It is extensively used in side stream filtration of cooling water & in potable water treatment. • It is ideal for filtration of clarified water. • In addition it finds application in sea water filtration & in filtration of chemical solutions. • For these types of filtrations rubber lined or epoxy painted filters can be offered. Specifications : • One vertical cylindrical Mild steel/FRP pressure vessels with dished ends. Mild Steel pressure vessel are painted internally with anticorrosive bitumastic paint and externally with a protective coat of red oxide primer. • One set of internal water distribution & collection system. • One initial charge of filter sand & underbed material • One set of frontal pipe work & valves. • Two pressure gauges to monitor head loss across the filter. • One orifice board (optional) for indicating wash water flow to be fitted in drain sump. Maximum / minimum operating pressure will be 3.5kg/cm2g & 2.0 kg/cm2g respectively. • Multigrade sand filters are available from 600 to 3000mn diameters.
