COMPREHENSIVE MAINTENANCE OF RO PLANT, WATER TREATMENT PLANT, SWIMMING POOL ALONGWITH REPAIRS/SERVICING OF CONNECTED INSTALLATIONS AT NAVY AREA (KOLKATA) AND REPAIR/REPLACEMENT OF CI/DI/GI PIPE LINE, VALVES AND REPAIR/SERVICING OF PUMP MOTORS , DOSIN

Amount

Comprehensive maintenance of water treatment plant of capacity 9000 GPH for safe and efficient running at INS Netaji Subhas and consisting of the following accessories complete all as specified and as directed :- (a) Oxidtion chamber-01 No. (b) Multigrade pressure filter-02 No. Note :- (i) Contractor shall be responsible for making salt solution, charge and shifting of salt bags etc, salt will be measured & paid separately if required. (ii) Hardness testing on daily basis & iron testing in every 15 days intervels and maintain register properly. Necessary test kit to be arranged by the contractor and quoted rate deemed inclusive of the rate. (iii) Responsible for rectification of any leakage from inlet and outlet connection with existing pipe line including replacement of gasket, nuts, bolts or any tools and fabrication of pipe line reqd at site within 24 hrs of reporting. (iv) Quoted rate is deemed to be inclusive for fixing of items Sl No: 10 to 20.

All as per item No-01 above but for capacity 10000 GPH at Dumayune Avenue complex.all as specified and as directed.

All as per item No-01 but for capacity 8000 GPH at Megnath complex.all as specified and as directed.

M & L for Opening top cover of manhole and side hand hole of 9,000-10000 GPH capacity pressure filter vertical type, unloading the filter media from the pressure filter e.g sand gravels (different sizes) takings out carefully strainer (Push/Thread) from inside bed plate, cleaning the inside chamber through chemical,brush etc and disposal of unsv filter media( sand,gravel,stainer etc) within 100 meter radius from the existing filter plant complete all as specified and as directed.

M & L for Opening top cover of manhole by unscrewing the bolts of 6400-9000 GPH softening plant, unloading the cation resin from upper portion of softening plant and disposal of unsv resin within 100 meter radius from the existing filter plant and cleaning the inside chamber through chemical,brush etc complete all as specified and as directed.

M & L for Opening top cover of manhole by unscrewing the bolts of 5000-10,000 GPH Oxidation chamber plant, unloading the unsv MNO2 from upper portion of oxidation plant and disposal of unsv MnO2 within 100 metere radious from the existing filter plant and cleaning the inside chamber through chemical,brush etc complete all as entire satisfaction of complete all as specified and as directed.

S & F MS frontal pipe 80 mm bore heavy duty with bend ,Tee etc flange type or welded of any length including taking down existing pipe complete all as specified and as directed.

All as per item No 7 above but for 100 mm bore complete testing all as specified and as directed.

All as per item No 7 above but for 150 mm bore complete testing all as specified and as directed.

Fixing only PVC strainer push fit for pressure filter as per existing size & shape complete all as specified and as directed.

Supply only of new filter sand of 10 x 40 mesh from Barakar layer by layer as per designed layer to the pressure filters at different location complete all as specified and as directed.

Supply only the new graded gravels of different size (Gravel of size 1.5" x 1", Pebbles of size 1" x 1/2", Core silex of size 1/2" x 1/4", Fine silex of size 1/4" X 1/8") inside the pressure filters at different location.

Supply only cation resin in the exisitng softening plant complete all as specified and as directed.

Supply only of MNO2 in the exisitng Oxidation chamber plant complete all as specified and as directed.

Supply only Vessel manhole and hand hole gasket of existing size complete all as specified and as directed.

Supply only diaphragm valve of size 80 mm dia (flange type) with fiber gasket including taking down old one complete all as specified and as directed.

All as per item No 16 above but for 100 mm dia complete all as specified and as directed.

Supply only butter fly valve (water type) of size 80 mm dia with fiber gasket including taking down old one complete all as specified and as directed.

All as per item No 18 above but for 150 mm dia complete all as specified and as directed.

M&L preparing external old steel surfaces of Water treatment plant (i.e. IR filter, Shoftner & Oxidation chember) incl connecting 80/100/150 mm MS pipe, valves, adjacent valve pit cover etc(as per colour reqd) and applying two coats of synthetic enamel paint complete all as specified and directed. Note: Plant name and capacity to be painted in standard size alongwith other numbering and arrow marking and rate deemded inclusive of the quoted rate.

M&L preparing Internal old steel surfaces of Water treatment plant (i.e. IR filter, Shoftner & Oxidation chember) and applying one coat of black bituminous paint suitable for drinking water inside the vessels (as reqd) complete all as specified and directed.

Chemical analysis and Bactariological Lab Test : as per I S : 10500,2012 (2nd Rev) of Raw water /Treated Water of IR Plant/RO plant from CGRA Manicktala, Dumayune Avenue, INS Netaji Subhas, Teesta Bldg & Meghnath Bldg from Govt Approved /NABL ACCREDITED Laboratory on monthly basis including collection of water, Sterilized bottle for testing and submission of the test report.

M&L for repair of leakage in water treatment plant vessels/pipeline with the help of suitable size of sheet/pipe/flange by fabrication and forming of sheet and then fabrication under supervision of competent person all as specified and as specified. Note: (i) Cost of sheet, fabrication, welding rod, flabge, gasket any size etc deemed inclusive of the quoted rate. (ii) High grade welding rod suitable for the existing vessel to be used only. (iii) Any transportation and cost of welding equipments deemed inclsive of the quoted rate.

Comprehensive maintenance of RO treatment plant for safe and efficient running at INS Netaji Subhash, Dumayune Avenue, Teesta Complex and Damodar Complex area for plant capacity of 600/400/200 LPH and consisting of the following accessories complete all as specified and as directed :- (a) Centrifugal pump-02 No. (b) Multigrade filter-01 No. (c) RO plant-01 No. (d) Softener - 01 No. Note :- (i) Contractor shall be responsible for making salt solution, charge and shifting of salt bags etc, salt will be measured & paid separately. (ii) Hardness testing on daily basis & iron testing in every 15 days intervels and maintain register properly. Necessary test kit to be arranged by the contractor and quoted rate deemed inclusive of the rate. (iii) Responsible for rectification of any leakage from inlet and out let connection with existing pipe line including replacement of gasket, nuts, bolts or any tools and fabrication of pipeline reqd at site within 24 hrs of reporting. (iv) Quoted rate is deemed tobe inclusivefor fixing of items Sl No :30 to 45 and 64 to 66.

Dismantling the PVC body multigrade filter unit, frontal pipe line and valves, un loading the media and cleaning media i.e pebbles, gravels using chemical, replacement of silex with new one, servicing of multi port valve, Refilling the media as per original complete including topping up and re-installation of unit & testing complete all as specified and directed.

All as per item No.25 here-in-before but activated carbon filter unit all as specified and as directed.

All as per item No.25 here in before but iron removal filter unit all as specified and as directed.

All as per item No.25 here-in-before but softner unit all as specified and as directed. NOTE FOR ITEM NO 25 to 28: Filter media, carbon media, iron removal media & resin for softner shall be measured & paid separately under respective items in this schedule.

Supply only 'fine sand 16 - 30 Mesh' all as specified and as directed.

Supply only 'Activated carbon granular (2.0- 5.0 mm) in sealed packets all as specified and as directed.

Supply only 'Gravels 2 - 6 Mesh' for Multigrade filter / activated carbon / Softner all as specified and as directed.

Supply only 'Silex for multigrade softner filter all as specified and as directed.

Supply only reverse osmosis micron cartiridge - 20" including taking down existing worn out ones complete all as specified and directed. Make : Gopani/Kemtek India/Multitex Engg or equivalent. Note : Each cartiridge use for each installation or as per site requirement. (Measured separately each time)

Supply only Reverse Osmosis membrane(Element - 4040-0) including taking out existing wornout/chocked reverse osmosis membrane, complete all as specified and directed. Make : ION Exchange Model HM4040-BWE-Max or equivalent make approved by GE.

Supply only for R.O. high pressure switch-2.5 to 25 kg/cm² including taking out existing old one, complete all as specified and directed.

Supply only for R.O. low pressure switch-0.5 to 2.5 kg/cm² including taking out existing old one, complete all as specified and directed.

Supply only for R.O. micron cartridge housing-PP-20" including taking out existing old one, complete all as specified and directed. Make : ION Exchange/Gopinath or equivalent

Supply only for R.O. membrane housing(FRP)-4" single element including taking out existing old one, complete all as specified and directed. Make : ION Exchange/UKL or equivalent

Supply only neddle valve of size 25mm(1") dia including taking out existing old one, complete all as specified and directed.

Supply only SS ball valve of size 25mm(1") dia including taking out existing old one, complete all as specified and directed.

Supply only Dial pressure gauge-middle connection of 0 - 10 Kg/sqcm, size (2.5") dia including taking out existing old one, complete all as specified and directed.

Supply only PP Adaptor for FRP vessel of size 100mm x 100mm dia including taking out existing old one, complete all as specified and directed. Make : Indion or equivalent make of Kemtek India/Multitex Engg.

Supply only PP Adaptor for FRP vessel of size 2.5" x 4" dia including taking out existing old one, complete all as specified and directed. Make : Indion or equivalent make of Kemtek India/Multitex Engg.

Supply only PVC brine ejector(PP) :- 1:1 ejector - 1" x 1/2" control valve 25mm dia including taking down old one complete all as specified and directed. Make : Indion/Kemtek India/Multitex Engg.

M&L for Overhauling of RO plant monoblock pumping set of capacity 0.5 HP/1.0HP, 1ph, 220V dismantling complete by opening the pump set form RO, cleaning of all parts i.e bushes bearing impellers, and replacement of coupling shaft seal and changing the Stainless steel casing of pump testing complete including re-installing at site and tested complete all as specified and directed.

M & L for Overhauling of RO plant monoblock high speed pumping set of capacity 3.0HP, 3ph, 415V dismantling complete by opening the pump set from RO, cleaning of all parts i.e bushes bearing impellers, and replacement of coupling shaft seal, changing the Stainless steel casing of pump and inlet/outlet rubber gasket testing complete including re-installing at site and tested complete all as specified and directed.

M & L for Cleaning of PVC tank of capacity 1000 ltrs by removing all scale from bottom and wall & cleaning and washing using chlorine solution as directed including writing date of cleaning complete all as specified and directed.

M & L for Cleaning of PVC tank of capacity 2000 ltrs by removing all scale from bottom and wall & cleaning and washing using chlorine solution as directed including writing date of cleaning complete all as specified and directed.

Supply only of PVC body multiport valve, top mounted for filter, suitable dia incl taking down exisiting unserviceable valve complete all as specified and directed. Make : ION Exchange/UKL/Initiative or equivalent

M & L for Cleaning of RO membrane duly taking out from RO plant, cleaning with Solution 1 to be used for inorganic fouling(Solution of Citric acid & RO product water duly adjusted to PH 4.0 with sodium hydroxide) and refixing the same of its original position and testing for leakage complete all as specified and directed.

All as per item No 51 above but with Solution 2 used for calcium sulphate and organic fouling (solution of Sodium Tripolyphosphate, Tetra Sodium EDTA (Versen 220 or equal) and RO Product -chlorine free ) duly adjusted to 10.0 with Sulphuric Acid (H2SO4)

Taking up/down interconnecting pipe HDPE/UPVC/GI pipe any type complete all as specified and as directed.

M & L Unplasticised PVC pipes of pressure rating 10 kgf/cm2 fixed complete to walls, ceilings or in floors etc, any type of pipe of bore 25 mm complete all as specified and as directed.

Repair/Maint of monoblock booster pump set of capacity 0.5 HP, 1ph, 230V taking out existing winding and rewinding the same with super enamelled bare insulated copper winding wire as per existing gauge and turn to achieve required RPM, replacement of ball bearing, connection wire, cooling fan of motor, oiling etc complete testing all as specified and as directed.

All as per item No 54 above but for capacity 1.0 HP , 1 phase complete testing all as specified and as directed.

All as per item No 54 above but for capacity 3.0 HP, 3 phase complete testing all as specified and as directed.

Supply and fix Stainless Steel fabricated Skid (assembled by SS304 steel square bar of size 25mm x 2.5 mm (thick), 25 x 25 x 25 mm x 2.5 mm (thick) channel and angle of size 25mm x 25mm x 2.5mm (thick), Steel Skid of size 1100mm x 850mm x 1600mm (H) of plant capacity 400 to 1000 LPH (i.e. 02 to 05 membrane system INDRO 405) for Reverse Osmosis plant including taking out existing rusted/wornout Skid, complete all as specified and directed.

M & L for Microprocessor based Panel with provn for connectivity of 1ph feed pump(upto 3HP) and 3ph high speed pressure pump(upto 5 HP) for Reverse Osmosis plant including taking out existing Panel, complete all as specified and directed. Make : Kemtek India or equivalant of ION Exchange /Multitex Engg )

Repair to monoblock high speed pump 3 HP for RO plant as feed pump complete including dismantling, the pump and repair at shop with changing the bush and ball bearing including necessary seal and lathe work on cracked body , brazing work etc and fixing the same on the position complete all as specified and as directed.

M&L 25mm bore high pressure brass ball valve conform to IS 1703-2000 including taking down old one complete all as specified and directed.

All as per item No 60 above but for 32mm bore complete all as specified and as directed.

Supply only (10"dia x 48" height) FRP vessel 4" top opening including taking out existing old one, complete all as specified and directed. Make : Indion or equivalent make of Kemtek India/Multitex Engg.

Supply only UV-Filter for RO product water for up to 400 LPH including all necessary fittings all as specified and as directed.

Supply only UV-Filter for RO product water for up to 750 LPH including all necessary fittings all as specified and as directed.

Supply and fix 3 layer FRP water tank UV sterlized suitable to store potable water of storage capacity 2000 ltr along with all accessories including taking down old one all as specified and as directed. Note: Base preparation and any fabrication deemded inclusive of the quoted rate. Make: Sintex or equivalent make approved by GE.

S&F butter fly valve (wafer type) gear operated of size 200 mm dia with fiber gasket including taking down old one complete all as specified and as directed.

S& F CI foot valve 80 mm with GM working parts as per IS-4038 including all connecting fittings with gasket completa all as specified and as directed.

Supply and fix for 80 mm dia CI Sluice valve with both end flanged, asket sets PN1.6 with hand wheel operation including taking down old unserviceable one complete all as specified and as directed.

S& F CI foot valve 150 mm with GM working parts as per IS-4038 including all connecting fittings with gasket completa all as specified and as directed.

S &F Water Pressure gauge 0-14 KGs including all connecting fittings and cutting/fabrication complete all as specified and as directed.

Repair & servicing of decrin dosing pump of capacity 2 ltr/ hours by opening the pump and checking all the spares parts minor defective parts if required and re-assembling and testing complete all as specified & directed. NOTE:- (i) Cost of new minor spare parts included in the quoted rate. (ii) Major spare parts like pulser assembly, injecting check valve, spacers, PVC Tubing if required shall be measured and paid separately as supply only under respective items in this Schedule.

Supply only PVC tubing suitable for decrin dozing pump complete all as specified & directed.

Supply only injecting check valve for decrin dozing pump complete all as specified & directed.

Taking out existing submersible pump set of any capacity along with column pipe from the bore well and lowering the same after repairing the pump set including and reconnection all electric & mechanical connection. Note: (i) One lifting & one lowering shall be measured one job. (ii) Repair to pumps & motor and replacement of spare parts shall be measured and paid separately. (iii) Replacement of column pipe if required shall be measured & paid separately as supply only under respective item in this Schedule.

Supply only column pipe 80 mm bore 3.0 m long made from MS ERW pipes as per IS:1239 (Part-I) with both end flangec with heavy duty sayonara socket including taking down old one complete all as specified & directed.

Dismantling/servicing carefully submersible pump and taking out/down and replacement of locknut, impeller key, collar ring, SS coupling nuts, bolts, washer and re-assembling the pump of capacity upto 10 HP and painting the pump set with two coats of synthetic enamel paint over a coat of red oxide primer after scraping out old paint complete all as specified and directed. Note : Spare parts like Thrust bearing, Impeller, Sand Guard, Bush, Shaft, NRV if required shall be measured and paid separately under respective items in this Schedule as supply only.

Supply only Thrust bearing for submersible pump of capacity 10 HP all as specified and directed

Supply only Gun Metal Impeller for submersible pump of capacity 10 HP all as specified and directed

Supply only Sand Guard for submersible pump of capacity 10 HP all as specified and directed

Supply only Gun Metal Bush for submersible pump of capacity 10 HP all as specified and directed

Supply only Stainless Steel Shaft for submersible pump of capacity 10 HP all as specified and directed

Supply only NRV for submersible pump of capacity 10 HP all as specified and directed

M&L for rewinding of electric motor of 7.5/10 HP (Submersible motor) with super enamelled copper wire of existing gauge, varnishing drying with electric furnace process with taking down burnt winding, cleaning of stator and rooter including replacement of bearing etc. including testing & commissioning complete all as specified and directed.

Dismantling, servicing carefully monoblock pump of capacity 10/15 HP and replacement of locknut, impeller key, collar ring, SS coupling nuts, bolts, washer and re-assembling same including testing complete all as specified and directed. Note : (i) all minor parts like nut bolts,washer,bush,bearing, gland coller, gland packing, impeler lock nut, rubber gasket, rubber seal etc are included in the quoted rate (ii) Major spare parts like Impeller, Shaft, coupling if required shall be measured and paid separately under respective items in this Schedule as supply only. (iii) Winding of motor if required shall be measured and paid separately under respective item in this Schedule (iv) necessary transportation cost for pump from site to workshop and back shall be included in quoted rate.

Supply only Gun Metal Impeller for monoblock pump of capacity 10/15/20 HP Make Calama, KSB, CRI all as specified and as directed.

Supply only Stainless Steel Shaft for monoblock pump of capacity 10/15/20 HP Make Calama, KSB, CRI all as specified and as directed.

Material & labour for rewinding of centrifugal monoblock pump motor 10/15/20 HP with super enamelled coper wire of existing gauge, varnishing drying with electric furnace process with taking down burnt winding,cleanining of stator and rotor including replacement of bush, bearing etc including testing & commissioning complete all as specified and directed.

Material & labour for repairing of monoblock pump motor of capacity 1.5/2.0 HP , replacement of ball bearing , bush, gland collar, nut bolts including rewinding with super enamelled coper wire of existing gauge, varnishing drying with electric furnace process with taking down burnt winding,cleanining of stator and rotor etc including testing & commissioning complete all as specified and directed.

Material & labour for repairing of openwell submersible pump motor of capacity 5/7.5 HP , replace of ball bearing , bush, gland collar, nut bolts including rewinding with super enamelled coper wire of existing gauge, varnishing drying with electric furnace process with taking down burnt winding,cleanining of stator and rotor etc including testing & commissioning complete all as specified and directed.

S&F PVC insulated water proof 3 core cable suitable for submersible pump set 1100 volts grade with standard copper conductor cable of size 6 sqmm complete all as specified and directed including taking down old one.

M&L for Cutting CI /DI/GI water mains in position for insertions of new fittings such as Tee, bend collar etc as required including wellding ,hole and ferul system upto 150 mm dia bore complete all as specified and as directedby Engr-in-charge.

Supply and fix for 100 mm dia CI Sluice valve with both end flanged, asket sets PN1.6 with hand wheel operation including taking down old unserviceable one complete all as specified and as directed.

Supply and fix 100 mm CI non-return valve, flanged end in swing type design with EPDM door and with over 250 micron epoxy coating including all necessary items including taking down old unserviceable one complete all as specified and as directed.

Supply and laying 80mm bore, Ductile Iron Pipe, conforming to IS-8329/2000, flanged ends, centrifugally cast Type K-9, in any length laid in trenches including taking down old one complete all as specified and directed. Make : Electrosteel Castings Ltd / Keshoram). Note : Jointing and excavation shall be measured and paid separately under respective items in this schedule

Supply and laying 100 mm bore, Ductile Iron Pipe, conforming to IS-8329/2000, spigot and socket type, centrifugally cast Type K-9, in any length laid in trenches including taking down old one complete all as specified and directed. Make : Electrosteel Castings Ltd / Keshoram). Note : Jointing and excavation shall be measured and paid separately under respective items in this schedule

M&L for DI pipes fittings upto 150 mm bore, such as bend (any type radius and angle) tapers, any type (straight bend increasing decreasing or double socket etc) Tee piece single branch junction 'Y' junction, cross, double branch (all sockets and/or socket and spigot) collars caps and plugs etc complete incl taking down old one all as specified and as directed.

S&F 50 mm dia gun metal globe/gate valve with iron wheel head screwed both ends for iron pipes and fixed in existing position including taking down unserviceable one complete all as specified and as directed.

S&F 40 mm dia gun metal globe/gate valve with iron wheel head screwed both ends for iron pipes and fixed in existing position including taking down unserviceable one complete all as specified and as directed.

S&F 25 mm dia gun metal globe/gate valve with iron wheel head screwed both ends for iron pipes and fixed in existing position including taking down unserviceable one complete all as specified and as directed.

S&F 20 mm dia gun metal globe/gate valve with iron wheel head screwed both ends for iron pipes and fixed in existing position including taking down unserviceable one complete all as specified and as directed.

Taking up or down 50 mm bore steel water tubing and connections including cleaning for refixing or removal all as specified and directed.

Taking up or down 40 mm bore steel water tubing and connections including cleaning for refixing or removal complete all as specified and directed.

Taking up or down 25 mm bore steel water tubing and connections including cleaning for refixing or removal complete all as specified and directed.

Taking up or down 20 mm bore steel water tubing and connections including cleaning for refixing or removal complete all as specified and directed.

Supply and laying 50 mm dia steel water tube medium grade galvanised with all fittings laid in trenches complete all as specified and as directed.

Supply and laying 40 mm dia steel water tube medium grade galvanised with all fittings laid in trenches complete all as specified and as directed.

Supply and laying 25 mm dia steel water tube medium grade galvanised with all fittings laid in trenches complete all as specified and as directed.

Supply and laying 20 mm dia steel water tube medium grade galvanised with all fittings laid in trenches complete all as specified and as directed.

M&L Rubber gasket for 200/150 mm bore CI flanged pipe including testing complete all as specified and directed.

M&L Rubber gasket joint for 100/80 mm bore CI flanged pipe including testing complete all as specified and directed.

Supply only industrial grease suitable for pump motor/engine etc all as specified and as directed.

Supply and fix gland packing various size for water/fire fighting pump, sluice valve etc all as specified and as directed.

M&L one coat of synthetic enamel painting over IRP plant including suction/delivery line complete a coat of red oxide primer after scraping,cleaning the rusted surface with the help of sand paper / wire brush of the complete and after cleaning of rusted surface painting with the help of painting brush for all existing monoblock pump, connected water pipe network, valve-pit cover, accessory, valve etc, all as per colour scheme provided by Engr-in-charge all as specified and directed.

Cleaning of semi underground sump of capacity 1.6/1.0 Lakh Ltr by emptying the sump with a help of a pump, scrapping out scale from bottom, ceiling & wall with the help of wire brush, cleaning by brooming and rubbing with coir brush / wire brush, taking out the sludge, mud/silt, dirt, scales,vegetations,grits, pebbles etc from bottom of tanks, washing the whole area by bleaching solution, draining out complete materials from tank, apply one coat of anti corrosive lead free oil paint after cleaning for outside of the tank including writing date of cleaning & tank capacity etc. complete all as specified & directed by Engr-in-charge.

Cleaning of Semi-underground sump of capacity 50 thousand Ltr by emptying the sump with a help of a pump, scrapping out scale from bottom, ceiling & wall with the help of wire brush, cleaning by brooming and rubbing with coir brush / wire brush, taking out the sludge, mud/silt, dirt, scales,vegetations,grits, pebbles etc from bottom of tanks, washing the whole area by bleaching solution, draining out complete materials from tank, apply one coat of anti corrosive lead free oil paint after cleaning for outside of the tank including writing date of cleaning & tank capacity etc. complete all as specified & directed by Engr-in-charge.

M&L for pipe support to DI/GI overhanging pipes by means of suitable size and length of GI Pipe/MS angle, U- clamp and Base plate grouted in PCC base at specified location all as specified and as directed.

M&L plain cement concrete 1:3:6 Type C1 (using 20 mm graded crushed stone aggregate) as in coping, roof kerb or similar work, rounded or chamfered on edges including necessary form work including demolition old one complete all as specified and directed.

Opening the manhole of Iron removal pressure filters and taking out the old/unserviceable existing sand gravels and feriminox agent of any size from beds and deposting the same not more than 150 mtr away from filter bed etc and washing the serviceable sand, gravells & fermimix agent by water stream and wire brush upto desired level and refilling the as per existing including cleaning and scrubing the all walls of Iron removal plant internally and externally with wire brush and white washing the same with potassium permagnate complete all as specified and directed by Engr-in-Charge.

Supply and filling in layers of coarse sand in filter media in filter bed grade size (10x20 Mesh) (as per existing) and 2 mm accumulated at top of the filter and coarse sand 3 mm grade below the fine sand etc complete all as specified and directed by Engineer-in-Charge.

All as per item No-122. here-in-before but layer of gravel graded size 12mm to 25mm.

All as per item No- 122 here-in-before but layer of gravel graded size 6mm to 12mm.

All as per item No-122 here-in-before but layer of gravel graded size 3mm to 6mm.

All as per item No-122 here-in-before but feriminox/MNO2 at catolic agent (Note: MNO2 sealed pack sample by Engr-in -charge should be tested by contractor from Govt approve Laboratory

Taking out old damage strainer any size and type (PVC/HDPE) and replace with new as per existing complete.

Comprehensive Maintenance/Servicing of Air Compressor assebly by Cleaning the whole body & Air tank,incl oil and filter replacement Greasing,Tightening of all nut bolts if required, including replacement of old gasket, Minor repairing to compressor Pump and Electric Motor including replace-ment of Spare Parts like V Belt /NRV,s of any size, Pully if required of any type etc. including repleacement of old oil SAE-90 and oter spares, complete all as specified and as directed. Note-: Material/Spare require for replacement shall be measured and paid seperately under mentioned items.

Supply and fix 80 mm CI non-return valve, flanged end in swing type design with EPDM door and with over 250 micron epoxy coating including all necessary items including taking down old unserviceable one complete all as specified and as directed.

Supply and fix 150 mm CI non-return valve, flanged end in swing type design with EPDM door and with over 250 micron epoxy coating including all necessary items including taking down old unserviceable one complete all as specified and as directed.

Development of existing bore well of any size by using compressor with necessary arrangement to remove the sand/waste material inside the bore well with pressure of air upto 4.5 kg/sq cm untill obtaining sand free water complete all as directed. Note : Price of chemicals deemed inclusive of the quoted rate

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