NIT No. 51/EE(BM-I)/2026-27

Dismantling, shifting and replacement of existing 25,000 CFM TFA (Treated Fresh Air) unit installed at the Underground Shopping Complex, Palika Bazaar, during night hours, including disconnection of existing electrical, control, chilled water, drain and ducting connections; dismantling of the existing TFA and heavy labour for shifting, loading/unloading, lowering/lifting and transportation of the unit through the underground shopping complex, including use of suitable tools, tackles, chain pulley, trolley and other handling equipment as required. Supply, installation, testing and commissioning of a new 25,000 CFM capacity TFA unit comprising double-skin insulated GI casing with adequate thermal and acoustic insulation, 4-row chilled water cooling coil made of copper tubes with aluminium fins, minimum 12 FPI, suitable headers, drain pan and SS/GI construction, properly sized for the required cooling capacity; centrifugal fan suitable for 25,000 CFM air quantity with 10 HP, 415V, 3-phase, 50Hz motor, complete with suitable starter/VFD arrangement, vibration isolators, flexible connections, air filters, filter section, access doors, inspection provisions, drain tray, necessary safety guards and all standard accessories. The work shall also include reconnection/modification of existing chilled water piping, drain piping, ducting and electrical/control connections, providing necessary supports, insulation and consumables, alignment, testing, air balancing and commissioning of the complete TFA system, including all labour, supervision, tools, tackles, transportation, heavy shifting arrangements and night-hour working charges, complete in all respects and as directed by the Engineer-in-Charge. Palika Bazaar near gate no. 2 & gate no.7

Supplying, fixing, testing and commissioning of following valves, strainers, gauges in the chilled water plumbing duly insulated to the same specifications as the connected piping and adequately supported as per specifications. BUTTERFLY VALVE (MANUAL) with C I body SS Disc, Nitrile Rubber Seal & O- Ring PN 16 pressure rating for chilled water/hot eater circulation as specified. 100 mm dia.

Supplying, fixing, testing and commissioning of following valves, strainers, gauges in the chilled water plumbing duly insulated to the same specifications as the connected piping and adequately supported as per specifications. Y - STRAINER of Ductile CI Body flanged ends with stainless steel strainer for chilled / hot water circulation including insulation as specified. 100 mm dia.

Supplying, fixing, testing and commissioning of following valves, strainers, gauges in the chilled water plumbing duly insulated to the same specifications as the connected piping and adequately supported as per specifications. BALANCING VALVE WITH BUILT IN MEASURING FACILITY with C I body flanged construction with EPDM coated disc with long pitch with protected out pipe insulation & PN 16 pressure rating for chilled / hot water circulation as specified. 100 mm dia.

Dismantling the existing ducts as in where required with the help of Ladder/scaffolding and SITC of new fabricated at site GSS sheet metal rectangular ducting complete with neoprene rubber gaskets, elbows vanes, hangers, supports etc. complete with 0.8 mm sheet thickness complete as Required at site.

Dismantling of existing damaged 300 mm dia vibration rubber bellows provided in the chilled water/condenser water piping of Main Chiller Plant No. 3, 600 TR, including isolation, draining of the concerned pipeline, removal of bolts/flanges, shifting of dismantled material and heavy labour as required; thereafter supply, installation, testing and commissioning of new 300 mm dia vibration-resistant rubber expansion bellows, suitable for chilled/condenser water application, with EPDM/neoprene rubber body, suitable working pressure and temperature rating, with MS/galvanized steel flanges, tie rods and all necessary hardware, complete with proper alignment and installation between existing flanges, including replacement of required gaskets, nuts, bolts, supports/fasteners, minor pipeline adjustments, tools & tackles, dewatering, refilling, air venting, testing for leakage and pressure, and restoration of the system, complete in all respects as directed by the Engineer-in-Charge.

Supply, dismantling and replacement of existing 300 mm dia gear-operated butterfly valves installed on the inlet and outlet lines of 3 Nos. chillers at Palika Bazaar, including isolation and draining of the concerned chilled water lines, removal of existing defective valves, cutting/dismantling of connected flanges and shifting of old valves, supply and installation of new 300 mm dia wafer/flanged type gear-operated butterfly valves suitable for chilled water service, with cast iron/ductile iron body, stainless steel stem, EPDM seat, suitable pressure rating and hand-operated gearbox, complete with matching flanges, gaskets, nuts, bolts, washers and other required accessories. The work shall include necessary minor pipe modifications, alignment, welding/fabrication wherever required, installation and tightening of valves, operation checking, pressure/leakage testing, refilling and venting of chilled water lines, and commissioning of all valves, including labour, tools & tackles, lifting/handling and consumables, complete in all respects as directed by the Engineer-in-Charge.

Credit for retaining the old buy back material received from S.No.1-7