PROVN OF FILTRATION AND DISTRIBUTION OF ACCUMULATED WATER OUT OF RAIN WATER HARVESTING IN GARDEN CITY MAP AREA UNDER AGE B/R (EAST) AT GE DE-HU ROAD

Pre Treatment Process :Supplying, installing, testing and commissioning of a complete pre-treatment system for rainwater harvesting plant of capacity 10 m³/hr, comprising first flush arrangement, leaf screen, debris filter, and silt trap/settling chamber (RCC size ≥ 2.2 m × 1.5 m × 1.2 m with baffle walls, effective volume ≥ 3.5–4.0 m³ providing minimum 20–25 minutes detention time), collection chamber (≥ 1.0 m × 1.0 m × 1.2 m), including all valves, drain piping, UPVC/HDPE piping, fittings, supports, clamps and accessories, complete in all respects.

Raw Water Feed Pumping system: Supplying, installing, testing and commissioning raw water feed pumping system comprising centrifugal pumps of capacity 10 m³/hr at 20–30 m head, complete with electric motors (2–3 HP), base frame, coupling, coupling guard, foundation bolts, suction and delivery connections with Piping: Suction line dia ≥65 mm Delivery line dia ≥50 mm, including one working and one standby pump, complete in all respects.

Pressure Sand/ Multi grade Filtration system Supplying, installing, testing and commissioning pressure sand / multigrade filter suitable for flow of 10 m³/hr, fabricated from FRP / MS epoxy coated vessel (Ø1000 mm × 1600–1800 mm height), complete with graded filter media (pebbles, silica sand, anthracite), internal distribution system with piping Inlet/outlet dia ≥50 mm, Backwash line dia ≥65 mm, inlet–outlet valves, manhole, pressure gauges and backwash arrangement.Required filtration rate within recommended limits (5–7 m³/m²/hr) complete in all respects.

Activated Carbon filtration system Supplying, installing, testing and commissioning activated carbon filtration system suitable for 10 m³/hr, including two FRP / MS epoxy coated vessels (one working and one standby), activated carbon media (coconut shell, iodine value ≥900), internal laterals, pressure gauges, inlet–outlet valves and accessories, complete. approved by Engineer In Charge.

Backwashing system Supplying, installing and commissioning complete backwashing system including Air Blower: capacity 30–40 m³/hr, with motor,starter, base frame, NRV, silencer, Backwash Water Pump: capacity 15–20 m³/hr @ 10–15 m head, with motor,starter, piping and valves Including interconnecting piping, valves and fittings for effective air-water backwashing of filters, complete in all respects..

Final Filtration & Measuring Instruments Supplying and installing multi-cartridge / self-cleaning filter (5 micron rating) as final filtration, complete with housing, cartridges (20”–40”), drain arrangement, pressure gauges, electromagnetic flow meter (50 mm NB) and all accessories, complete.

UV Disinfection System Supplying, installing, testing and commissioning UV disinfection system suitable for flow of 10 m³/hr, complete with SS304 UV chamber, UV lamps, control panel, indicator lamps, alarms and all accessories, complete. Minimum UV dose shall be 30 mJ/cm². Equipment shall be supplied from reputed OEMs or equivalent approved by Engineer In Charge.

Chemical / Mineral Dosing System Supplying, installing and commissioning dosing system comprising dosing pumps of approx. 50–80 LPH capacity (one working and one standby), HDPE dosing tank (100–200 L capacity), dosing lines, foot valves, NRVs and accessories, complete. Equipment shall be supplied from reputed OEMs or equivalent approved by Engineer In Charge.

Interconnecting Piping & Valves Supplying, fabricating, erecting and testing interconnecting pipelines for raw water, filtered water, backwash and drain lines using MS epoxy coated / GI / UPVC / HDPE pipes, including Raw water suction pipe dia ≥65 mm,Pump delivery pipe dia ≥50 mm , Filter inlet/outlet pipe dia ≥50 mm, Backwash water pipe dia ≥65 mm, Air line pipe dia 25–32 mm, Drain line pipe dia ≥75 mm, Treated water line pipe dia 50 mm all valves such as butterfly / sluice / ball / NRV, flanges, gaskets, nuts & bolts, supports, clamps, painting and all accessories, complete..Equipment shall be supplied from reputed OEMs or equivalent approved by Engineer In Charge

Electrical & Instrumentation Works Supplying, installing, testing and commissioning complete electrical and instrumentation works including 415 V, 3-phase, 50 Hz power supply system with incoming cable 4cx25 sqmm from near by pole/panel, incomer MCCB (40–63 A), floor-mounted IP54/55 MCC panel with copper busbars, voltmeter, ammeter, indication lamps and control transformer,proper earthing to panel. DOL starters for all motors with overload, short circuit and single phasing protection, MCBs (raw water pump 16 A, backwash pump 20–25 A, air blower 16–20 A, dosing pumps and UV system 6–10 A), auto/manual operation with level-based controls and interlocks, field instrumentation such as pressure gauges, electromagnetic flow meter (50 mm NB), level sensors, complete cabling using FRLS copper cables size (1.5–4 sq.mm) in trays/conduits, earthing system with double earthing (<5 ohm), internal wiring, panel illumination, alarms, safety protections and provision for future PLC/SCADA integration, complete in all respects as per IS/IEC standards and as approved by Engineer-in-Charge.