retrofitting schemes under DWS subDivision Mohanpur SH. Yearly renovation of existingIron removal plant capacity 10000GPH attached to existing DTW under Mohanpur,Bamutia, Lefunga RD block inc. change of filter media at different IRP during 2025-26

Providing and placing rapid gravity filter sand having effective size of 0.50 mm to 1.00 mm & uniformly co-efficient or not more than 1.70 and or less than 1.0 obtained from Barakar River, West Bengal as per specification and direction of the Engineer-in-charge.

Providing and placing filter gravel having effective size of 3.00 mm to 25 mm & uniformity co-efficient of not more than 1.70 and or less than 1.30 obtained from Barakar river, West Bengal as per specification and the direction of the Engineer - in-charge.

Providing and placing of anthracite coal 3.0 mm to 6.00 mm of SP Gr. 1.4 in IRP as per specification and direction of the engineer-in-charge.

Charges for spreading of filter media ( sand and gravel after proper cleaning and washing ) inside the package type IRP as per specification and the direction of the Engineer-in-charge. ( excluding the cost of sand and gravel ).

Providing and placing polypropylene double hexagonal nut umbrella shaped strainer at 10 mm to 10 mm to 12 mm size of best quality as per direction of the Engineer-in-charge.

Opening the iron removal filter and removal the old filter media scrapping inside/outside cleaning properly painting inside by black bituminous paints & painting outside by synthetic enamel over coat of steel primer as per direction of the Engineer-in-charge.

Supplying cleaning & placing of manganese dioxide (mno2) size 20 mm to 40 mm) inside the oxidation chamber betwewn two plates intermoving existing old mno2 from the chamber and disposal within 50 m lead complete as per direction of the Engineer-in-charge.

Labour charges for opening & unloading of MNO2by cutting of vessel mechanically & scrapping of inside wall of vessel etc. as per direction of the Engineer-in-charge.

Providing fitting fixing of 150 mm dia butterfly valve ISI mark short water type with required nuts and bolts. i) 150 mm dia

Providing and fixing C.I. sluice valves ( with cap ) complete with bolts, nuts, rubber insertions etc. ( the tail pieces if required will be paid separately ) as per CPWD specification and direction of the Engineer - in - charge.

i) 50 mm dia

i) 65 mm dia

Providing and fixing GI pipes of medium class as per IS: 1239 with letest amendment complete with GI flanges and clamps, including cutting and making good the walls etc. complete as per CPWD specification and direction of the Engineer in- Charge A. Internal work- Exposed on wall

i) 15 mm dia nominal bore

ii) 25 mm dia nominal bore

Providing and fixing GI nipple of medium class as er CPWD specfication and direction of the Engineer-in-charge.

i) 15 mm dia 150 mm long

ii) 25 mm dia 150 mm long

Providing and fixing G.I. Bend /elbow in the pipe line including testing of joints complete as per CPWD specification and direction of the Engineer - in - charge.

i) 15 mm dia

ii) 25 mm dia

iii) 50 mm dia

iv) 65 mm dia

Providing and fixing G.I. socket as per CPWD specification and direction of the Engineer - in - charge.

i) 15 mm dia

ii) 25 mm dia

Providing and fixing G.I. union as per CPWD specification and direction of the Engineer - in - charge.

i) 15 mm dia

ii) 25 mm dia

Providing & fitting fixing of G.I. flange ( 10 mm wall thickness ) by welding with G.I. / MS pipe and placing position as per specification and the direction of the Engineer-in-charge.

i) 150 mm dia

ii) 80 mm dia

iii) 65 mm dia

iv) 50 mm dia

Providing and fitting fixing of brass fullway valve with handle in the GI pipe line including cutting, threading etc. complete as per CPWD specification and direction of the Engineer - in - charge.

i) 15 mm dia

ii) 25 mm dia

Repairing of non functional air blower of 300 m3/hr. capacity by dismantling, replacement of damaged parts, oiling, freasing & reassemnling, realignment of mtc. pulley, motor pulley etc. to make the blower functional as per direction of the Engineer-in-charge.

Repairing of metering pump (SWELLORE make) of minimun capacity 6 LPH & maximum 25 LPH for 10000 GPH capacity IRP and pressure of pump 10 kg/cm2

Repairing of non functional air compressor of 10.0 to 20.0 cfm capacity by dismantling, replacement of damaged parts, oiling, freasing & reassemnling, realignment of mtc. pulley, motor pulley etc. to make the compressor functional as per direction of the Engineer-in-charge.

Providing and fitting fixing diaphragm valve washer of approved quality as per direction of the Engineer-in-charge.

i) 150 mm dia

ii) 80/100 mm dia

Providing and fitting fixing diaphragm valve MS spindle of approved quality as per direction of the Engineer-in-charge.

i) 150 mm dia

ii) 80/100 mm dia

Providinig and fixing CI non-return valve of approved quality as per of CPWD specification and direction of the Engineer-in-charge.

i) 50 mm nominal bore

Providing and fixing bal valve(brass) of approved quality complete.

i) 25 mm dia

Providing and fitting fixing CI plate NR valve of having 200 CSM capacity on blower line of package type iron removal plant of approved quality as per direction of the Engineer-in-charge.

Providing and fitting fixing direct online type motor starter AC3, 415 V, 50 Hz, 3ph) 7.1 HP/5.5 kw relay range 11-18 Amps in steel sheet enclosures of L & T make cat No. MK-DOLSS96211 suitable for 5.00 HP motor of compressor/ blower as per direction of the engineer-in-charge.

Providing and fitting fixing direct online type motor starter AC3, 415 V, 50 Hz, 3ph) 7.1 HP/5.5 kw relay range 9-15 Amps catalog no.SS97210 in steel sheet enclosures of L & T make cat No. MK-DOLSS96211 suitable for metering pump as per direction of the engineer-in-charge.

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