WBPHED/EE/MAAD/NIeT _07 of 2018-2019. SL 02

Amount

Design, Fabrication, Supplying, Installation, Commissioning, and 3 (three) months Trial Run and 9 months operation & mantainance of 43 m3 / hr. capacity Iron Elimination Plants (Pressure type) with provision of polishing unit including construction of 1 (one) Compressor Room with internal size (3.6mtr x 3.00 mtr) and proper disposal of backwash water for BARAPHULBARI Water Supply Scheme at Englishbazar Dev. Block under Malda Arsenic Area W/S Division, PHE Dte. in the District of Malda. CONDITIONS TO BE SATISFIED: (a) No: of vessels: minimum 2 Nos. as per approach road condition in site (b) Filter Media: Sand , Anthracite and Gravel with Specific Gravity of minimum 2.65 , 1.4 and 2.65 and U.C. of 1.3 to 1.5 respectively (c ) initial head loss should not exceed 0.3m (d) Filtration Rate: 6 m3/hr/m2 (e) Backwash Velocity between: 24 to 36 m/hr (f) Combined depth of sand & anthracite or sand should be minimum of .75 m (g) minimum freeboard of 0.5m (h) frontal pipe , backwash pipes , connecting pipes drains, oxidation chamber should be designed in accordance to CPHEEO mannual (i) pressure filter and oxidation chambers should have sampling points with provision and fitting of filter gauges, sand expansion gauges and at least two rate of flow controllers as per CPHEEO Mannual. (j) The oxidization to be supplied by the agency during trial run and mantainance period shall be designed as per requirement and normality/concentration of the solution should be design satisfying the guidelines of CPHEEO manual (k) the units should be connected with each other with all pipelines complete and the oxidation chamber and the filter water pipeline should also be connected with raw water main and delivery main respectively as per condition with proper by pass arrangement. (l) all structural drawing and design of the structural components should follow relevant IS codes. (m) the backwash water should not exceed the total water to be treated by 2% as per CPHEEO Mannual

Construction of proper drainage system by drain/ pipe fitting/ any alternate arrangement within a lead of 100 mtr. From IEP back wash pipe outlet to nearby Drainage Point / Pond etc per site condition with construction of platform of the IEP complete with sand filling, soling & M15 concrete(1:2:4) with minimum thickness of 100 mm as per direction and satisfaction of EIC

Banik Brothers

NEOGI ENTERPRISE

M/S PARIMAL DAS