CA NO GE(U)/CHM-50/2024-25 REFURBISHING AND MAINTENANCE OF RAPID SAND FILTER BEDS AND OTHER CONNECTED ACCESSORIES UNDER GE (U) CHANDIMANDIR

Amount

M & L for removal of existing unserviceable filter media from filter bed of approximate size 8m (L) x 5 m (W) x 2m (D) filtration plant at Mansa Devi Pump House and disposal of unserviceable media/material from each filter bed to a designated place, distance not exceeding 200m including dismantling of existing air blow-down piping system, dismantling of air lateral pipes and header block tees, nozzles etc, cleaning and disinfection of entire internal surface of the filter bed using a suitable cleaning agent and/or bleaching powder, scrubbing the side walls to remove any form of deposit using a wire brush complete all as specified and directed.

Note: (a) Only one number of Rapid Gravity Filter Bed is to be taken for overhauling at a time and the same will be done as per instructions and as directed by Engineer-in-Charge. (b) Prior to starting of overhauling of a filter bed, the required materials for overhauling should be brought at site. (c) Entire labour, Engineer, supervisor, plant & tools required for executing the work and for safety of persons deployed on the work shall be contractor’s arrangement and responsibility. (d) During dismantling, a joint inspection will be carried out by Engineer-in-Charge with contractor and the detail of the filter media layers will be drawn. (e) Supply of all the materials of the Rapid Gravity Filter Bed for overhauling shall be measured and paid separately. However cleaning agent and/or bleaching powder are included in the quoted rates against this item.

M & L for refixing of serviceable header block, tees, nozzles, perforated lateral pipes, air blow down system etc. as retrieved from srl. item no. 01, same as existing arrangement using appropriate tools at mansa Devi Pump House complete all as specified and directed.

Note: (a) New header block, perforated pipes, air blow down pipe in lieu of unserviceable if required, and other PCC work shall be measured and paid separately. (b) The quoted rates shall be deemed to be inclusive of cost of welding work for jointing of MS pipes, jointing of existing perforated pipes and other essential works for successful operation of back washing and air blow down system.

Supply and filling of filter media comprising of graded gravel of particle size 25mm-40mm, in accordance with IS: 8419 Part-I, hard and preferably rounded with specific gravity not less than 2.5, free from clay, sand, loam and organic impurities of any kind, Filter gravel shall not contain more than 2 percent by mass of thin, flat or elongated pieces (in which the largest dimension exceeds three times the smallest dimension) determined by hand picking. Gravel should be free from excessive amount of limestone or shells and acid solubility determined in accordance with procedure given in Appendix B of IS: 8419 (Part-I)-1977 and should be within limits as specified in IS (not more than 10.00 % for gravel sizes 10mm or larger and 5.00% solubility for gravel sizes smaller than 10mm) complete all as specified and directed.

All as per item No. 3 here-in-before but of particle size 12 mm-20 mm.

All as per item No. 3 here-in-before but of particle size 6 mm-12 mm.

All as per item No. 3 here-in-before but of particle size 3mm-5mm.

Supplying and filling filter media comprising of filter sand consist of hard, durable grains of silica of particle size 1mm-2mm, in accordance with IS: 8419 Part-I, specific gravity not less than 2.5, uniformity coefficient less than 1.5, All grains of sand shall preferably be water worn. Silica content tested in accordance with IS: 2000, any sample of filter sand shall not contain more than 5 percent by volume of impurities, such as clay, loam, silt etc. in one hour settlement after shaking in water in accordance with procedure described in IS: 8419 (Part-I)-1977. The sand shall not contain more than 5 percent of acid soluble matter as determined by solubility test described in IS. The loss on ignition, which is a measure of the organic matter present in sand, and determined by the procedure given in Appendix C of in IS, complete all as specified and directed.

All as per item No. 7 here-in-before but of particle size 0.5 mm-0.8 mm

Note for item No 03 to 08: (a) The new filter media layers are to be placed as per the details drawn during the joint visit in Ser Item No 1.00. (b) Each filter bed will be filled with approx 80 Cum of filter sand and gravel, the quoted rates shall be deemed to be included of labour charges. (c) After filling of rapid gravity filter bed there shall be test run and the filtered water shall be tested at NABL certified test laboratory and turbidity should conform to IS: 10500/2012 standards and the cost of same shall be included in rate quoted. (d) The filter media shall conform to all the parameters mentioned in IS: 8419 Part-I and a test certificate in this regard from supplier and from an NABL accredited laboratory for each type of sample is to be submitted for approval of GE before incorporating in work.

(e) The flow rate of the overhauled filter bed should conform to the designed flow rate of the water treatment Plant. In case, the turbidity does not conform to IS: 10500/2012 standards, the Contractor should be required to identify the fault and rectify the fault of the Rapid Gravity Filter beds at their own cost.

Labour only for washing, sieving, cleaning, drying and filling of existing filter gravels of any size retrieved during removal of existing gravel using appropriate method, for removing any kind of impurity, foreign particles and kept at suitable place at site for reuse complete all as specified and directed.

Supplying and fixing perforated HDPE black pipes, as per IS: 4984, of PE 100 and PN 16 for 125 mm outer dia, of approved colour with neccessary fitting complete all as specified and as directed.

Supplying and fixing as in replacement Ductile iron double flanged butterfly valves 400 mm nominal bore, bronze bearings, teflon bushes, SS 304 retaining ring, EPDM seals complete with gearbox and hand operated wheel fitted / fixed in position, including taking up / down old valve installed at MDPH, complete all as specified and as directed.

Supplying and fixing as in replacement Ductile iron double flanged butterfly valves 600 mm nominal bore, bronze bearings, teflon bushes, SS 304 retaining ring, EPDM seals complete with gearbox and hand operated wheel fitted / fixed in position, including taking up / down old valve installed at MDPH, complete all as specified and as directed.

Supplying and fixing as in replacement cast iron rising sluice valve, SS spindle 150 mm bore, flanged ends PN-1.6, ISI marked as per IS:14846/2000 and CI operating wheel fitted / fixed in position, including taking up / down old valve, including gasket, nuts, bolts and washers complete all as specified & directed.

Supplying and fixing as in replacement cast iron rising sluice valve, SS spindle 200 mm bore, flanged ends PN-1.6, ISI marked as per IS:14846/2000 and CI operating wheel fitted / fixed in position, including taking up / down old valve, including gasket, nuts, bolts and washers complete all as specified & directed.

Supplying and fixing as in replacement cast iron rising sluice valve, SS spindle 250 mm bore, flanged ends PN-1.6, ISI marked as per IS:14846/2000 and CI operating wheel fitted / fixed in position, including taking up / down old valve, including gasket, nuts, bolts and washers complete all as specified & directed.

Supplying and fixing as in replacement cast iron rising sluice valve, SS spindle 300 mm bore, flanged ends PN-1.6, ISI marked as per IS:14846/2000 and CI operating wheel fitted / fixed in position, including taking up / down old valve, including gasket, nuts, bolts and washers complete all as specified & directed.

Supplying and fixing as in replacement cast iron non return valve, 150 mm bore, flanged ends, PN-1.6, ISI marked fitted / fixed in position, including taking up / down old valve, including jointing materials gasket, nuts, bolts and washers complete all as specified & directed.

Supplying and fixing as in replacement cast iron non return valve, 200 mm bore, flanged ends, PN-1.6, ISI marked fitted / fixed in position, including taking up / down old valve, including jointing materials gasket, nuts, bolts and washers complete all as specified & directed.

Supplying and fixing as in replacement cast iron non return valve, 250 mm bore, flanged ends, PN-1.6, ISI marked fitted / fixed in position, including taking up / down old valve, including jointing materials gasket, nuts, bolts and washers complete all as specified & directed.

Supplying and fixing as in replacement Ductile iron Foot Valve, PN 10, EPDM seals, SS weld overlay, with Galvanized steel filter, as per IS 4038 of size 150mm, complete all as specified and directed.

Dismantling of existing 16 inch mechanical butterfly valve by gas cutting from exisiting MS pipe, breaking/ cutting of existing PCC flooring dismantling Joint and flange by welding, and shifting of unserviceable mech butterfly valve to civil work shop for repair of gear any type including lath work, greasing, replacement of rubber gasket and refixing the same in its original position with and including necessary PCC work and testing etc., installed at MDPH complete all as specified and directed.

M & L as in repair/replacement of stainless steel spindle threaded rod as per existing for sluice valve size upto 200 mm with nuts,Gutka all as specified and directed by Engr-in-Charge.

M & L for PCC 1:2:4 type B-1 using 20mm graded stone aggregate to support the pipe line etc, with necessary form work including demolition of existing PCC complete all as specified and directed.

M&L Glow sign board of size 20'0" x 2'0" x 0'6'', design, composition, supply & Installation of single sided lit signage made from 3mm acrylic sheet both side and aluminium frame, IP 68 protection, LED modules of samsung or equivalent with appropriate power supply & ISI mark electrical fitting, Inside graphics - 3 M graphics pasted on 3mm acrylic sheet ISO:9001-2008 product with premium grade anodizing as per IS standards with 2 years warranty under normal working conditions complete all as directed.

Supply and fixing as in replacement Multi stranded copper conductor cable PVC insulated unearthed 1100Volts grade of size 1.50 Sqmm 2.00 Core for connection all as specified and directed.

Supply and fixing as in replacement submersible cable 3 core 10 sqmm multi stranded copper conductor complete all as specified and directed by Engr-In-Charge.

S&F soft starter from motor starter panels and supply and fixing soft starter 3 phase, 50 Hz, 415 V, Icl current rating 140A, with heat sink , internal by pass, supply voltage limits from 195V to 484 V, phase failure and thermal protection, suitable for 75 kW motor including taking down, complete all as specified and directed.

Supply and install Retro Reflective Sign Boards for electrical installation of size 4 feet x 5 feet (print area) as per the following specifications:- (a) Post (pillar type) 55 mm dia 2 mm thickness SS 304 grade 9.5 feet long -02 Nos fittted with MS base plate 150 mm x 150 mm x 5 mm thickness at the bottom and 50 mm dia SS half balls on the top (b) Pipe for print area frame using 32 mm dia 1.2 mm thickness SS 304 Grade pipe and 06 Nos connecting pipes of 50 mm length. (c) SS rivetted strip 2 mm thickness and size 30 mm length & 25 mm width- 16 Nos. (d) 3 mm thick ACP sheet (aluminium composite sheet) of size 4 feet x 5 feet along with 1 mm thickness retro reflective material for approved colour and writing work in capital letters and numbers on both sides of ACP sheet all as specified and directed. (e) PCC 1:2:4 type B-1 block of size 300 mm x 300 mm x 450 mm- 02 Nos for grouting of sign board incl earth work complete all as specified and directed.

Taking down CI/ DI/ MS pipe (including all fittings) with spigot and socket / flange ends centrifugally cast 300 mm bore laid in trenches/ floors/ walls etc complete all as specified and directed by Engineer - in - Charge.

Taking down CI/ DI/ MS pipe (including all fittings) with spigot and socket / flange ends centrifugally cast 400 mm bore laid in trenches/ floors/ walls etc complete all as specified and directed by Engineer - in - Charge.

Taking down CI/ DI/ MS pipe (including all fittings) with spigot and socket / flange ends centrifugally cast 500 mm bore laid in trenches/ floors/ walls etc complete all as specified and directed by Engineer - in - Charge.

Supply and fixing vertically/ horizontally on wall/ laid in trenches 300mm bore MS pipe, medium grade, as per IS-1239 (Part-I) and IS marked, joints welded, complete all as specified and directed. Note:- MS fittings & MS Flanges shall be measured and paid separately.

Supply and fixing vertically/ horizontally on wall/ laid in trenches 400mm bore MS pipe, medium grade, as per IS-1239 (Part-I) and IS marked, joints welded, complete all as specified and directed. Note:- MS fittings & MS Flanges shall be measured and paid separately.

Supply and fixing vertically/ horizontally on wall/ laid in trenches 500mm bore MS pipe, medium grade, as per IS-1239 (Part-I) and IS marked, joints welded, complete all as specified and directed. Note:- MS fittings & MS Flanges shall be measured and paid separately.

S & F in repair ductile iron pipe fittings such as bends, tapers, tee pieces single branch, "Y" junction, collars, caps and plugs etc spigot socketed or flanged ends type of size upto 600 mm (K-12) nominal bore conforming to IS-9520/2000 with pressure rating PN-1 (all the fittings shall be coated for rust prevention i.e. external coating zinc rich paint with finishing layer of bituminous as per Annexure - A of IS:9523/2000 and internal lining shall be of cement mortar with seal coat as per Annexure 'B' of IS-9523/2000) including Jointing and jointing material complete all as specified and directed.

M&L for cleaning of wall surface by removing dust, chipped out loose particles, removing of existing plaster & any type of existing treatment etc with suitable technique depending on site conditions and chipping out any visible cracks in "V" groove pattern then filling those cracks with SIKA latex / SBR 100 putty of M/s SIKA or equivalent product of makes M/s Fosroc or M/s Pidlite.

M&L providing and applying 10 mm thick plaster with Sika Monotop-122F mixing with 4.5 - 4.8 ltr water per 30 kg of Sika Monotop. Material should have Compressive strength ≥ 55 MPa after 28 days, Tensile strength in flexure ≥ 9.0 MPa after 28 days, Tensile adhesion strength ≥ 12.0 MPa after 28 days. Product : Sika Monotop -122F of M/s SIKA or equivalent product of makes M/s Fosroc or M/s Pidlite.

M&L for providing and applying solvent free, moisture insenstive epoxy resin based putty to the junction of wall and pipe for dia of pipe 400 to 600 mm penetration joint to concrete . Product : Sikagard -694 F(I), Yield 0.6 ltr/Kg of M/s SIKA or equivalent product of makes M/s Fosroc or M/s Pidlite.

M&L for porcelain mosaic coloured tiles of size 300 x 300 x 8mm thick of premium quality fixed on wall and floor by applying deformable cementitious adhesive with no vertical slip high performance after completing water proofing treatment complete all as specified and directed.

Dismantling floor or wall tiles including cement mortar bedding, removing serviceable tiles to store and rubbish off the premises complete all as specified and directed by Engineer - in – Charge.

M & L for glazed ceramic coloured tiles 7mm thick 350 x 250 mm size in vertical surface set and jointed in neat cement slurry and pointed in white cement paste pigmented to the shade over and including 10mm thick cement sand plaster (1:4) complete all as specified and directed by Engineer - in - Charge.

M/S BALWINDER SINGH (BID ID -3275359)

Bharat Enterprises (BID ID -3274616)