PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
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Filters House and associated plant and equipments:<br />
Settled water from the clarifier shall pass through a battery of rapid gravity sand<br />
filters and then to the filtered water reservoir being chlorinated enroute. 2 filters are<br />
to be provided. Each filter shall be made up of two sections. Each section is 4.5m<br />
wide and 5.8m long. Filter cleansing shall be effected by first agitating the beds<br />
with compressed air and back washing at a wash rate of 600 LPM /m² of bed<br />
surface area. The under-drain system comprises A.C. pressure pipe strainers of<br />
80mm bore perforated at intervals for admission of filtrate and egress of agitating<br />
air and back-wash water. Strainers fit into RGC Tee pieces opening into a header<br />
channel below the floor of the bed, connected to the filter outlet pipe.<br />
Clear water reservoir :<br />
Filtered water from each of the 2 filters shall flow into the common channel<br />
chlorinated enroute into the reservoir having the capacity of 1000 KL. Water from<br />
the reservoir shall be simultaneously transferred to the supply main maintaining<br />
maximum pressure in the reservoir at all time.<br />
Disinfection :<br />
For sterilization of the filtrate, chlorination with chlorine solution shall be used. The<br />
flow of chlorine from the chlorine cylinder into the absorption tower shall be<br />
adjusted and control by the chlorinator control panel.<br />
Associated plant & equipments and instrumentations:<br />
All butterfly/sluice/gate valves for the plant shall be of motorized actuator and<br />
position indicator for compatibility with the proposed automation control system.<br />
The MCC for different drives viz. clarifier, flocculator, flash mixer, alum mills,<br />
lime mills, air blower, backwash pump including instrumentations equipments shall<br />
also be compatible with the proposed automation & control system.<br />
Motor control centre :<br />
The MCC shall be Free standing, floor mounted, single front, non-draw-out type,<br />
with aluminium busbars. Each MCC shall be provided with a single incomer having<br />
SFU of 400A rating. Indication lamps for R, Y, B phases together with Ammeter &<br />
Voltmeter shall be provided at the incomer panel. Outgoing feeders will be having<br />
DTS : Detailed Tender Specification. Page 241
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