REPAIR/MAINTENANCE OF CERTAIN CENTRAL AIR CONDITIONING PLANTS INSIDE TECH AREA OF AF STN GWALIOR

Amount

Taking down the existing unserviceable cooling tower 70TR and supply, installation, commissioning and testing of induced draft top discharge counterflow type FRP cooling tower (Rectangular/round bottle shape) of capacity 70TR with FRP body and base, water spray headers, cooling tower fills, fan with motor, MS ladder up to ground level, making suction and discharge pipeline connection including support base frames/foundation work as per manufacturer's standard instructions including electric cable work from cooling tower motor to control panel in light grade GI pipe with 2 Nos GI earth wire extended along with cable clipped of 25mm bore medium grade from panel to motor complete including supply and connected make up water tank with suitable size of GI pipe connection and necessary RCC staging/foundation complete all as specified and directed.

Taking down the old unserviceable M.S Pipe and supply, laying/fixing, testing, and commissioning of 80mm dia. M.S. 'C' class as per IS:1239 for CONDENSER water piping with necessary clamps, vibration isolators and fittings but excluding valves, strainers, gauges, etc. complete all as specified and directed.

Taking down the old unserviceable M.S Pipe and supply, laying/fixing, testing, and commissioning of 65mm dia. M.S. 'C' class as per IS:1239 for CONDENSER water piping inside the building with necessary clamps, vibration isolators and fittings but excluding valves, strainers, gauges etc. complete all as specified and directed.

Taking down the old unserviceable butterfly valve and supplying and installing butterfly valve of size 80mm dia (for condenser pipeline) in the water pipelines by providing flanges, short pieces of mild steel pipes, Gaskets, nut, bolts and washers complete all as specified and directed.

Taking down the old unserviceable butterfly valve and supplying and installing butterfly valve of size 65mm dia (for condenser pipeline) in the water pipelines by providing flanges, short pieces of mild steel pipes, Gaskets, nut, bolts and washers complete all as specified and directed.

Taking down the old unserviceable Non-Return valve and supplying, fixing, testing and commissioning of NON-RETURN VALVE of 80mm dia with dual plates of CI body SS plates vulcanized NBR seal flanged end & PN 1.6 pressure rating in the chilled/hot water plumbing duly insulated to the same specifications as the connected piping and adequately supported as required complete all as specified and directed.

All as per item no. 6.00 here-in-before but 65mm dia

Taking down the old unserviceable Y-Strainer and supplying, fixing testing and commissioning of Y-STRAINER of 80mm dia, ductile CI Body flanged ends with stainless steel strainer in the chilled/hot water plumbing duly insulated to the same specifications as the connected piping and adequately supported as required complete all as specified and directed.

All as per item no. 8.00 here-in-before but 65mm dia

Taking down the old unserviceable Flow Switch and supplying, fixing testing and commissioning of FLOW SWITCH of 25mm dia, brass/polymer construction in the chilled/hot water plumbing duly insulated to the same specifications as the connected piping and adequately supported as required complete all as specified and directed.

Taking down the old unserviceable pressure gauges and Supplying, fixing, testing and commissioning Industrial type pressure gauges with gun metal/brass construction isolating valve complete with all accessories as required duly insulated to the same specifications as the connected piping and adequately supported as required complete all as specified and directed.

Taking down the old unserviceable mercury thermometer and Supplying, fixing, testing and commissioning of Industrial type mercury thermometers with gun metal/brass construction isolating valve complete with all accessories as required duly insulated to the same specifications as the connected piping and adequately supported complete all as specified and directed.

Taking down the old unserviceable Mono-Block Pumpset and supply, Installation, testing and commissioning of 7.5HP end-suction Mono-Block centrifugal Condenser water pump Set capable of delivering of water against Suitable WG head comprising of the following:- (a) Pump with bronze impeller, S.S Shaft, CED Coated CI body, and mechanical seal - 1 No. (b) Suitable HP, TEFC squirrel cage induction motor (IE-2) with class 'F' insulation, 2900 RPM synchronous speed, Head 16 to 30 Mtr, Discharge capacity - 19 to 11.1 Ltr/Sec, Sunction and delivery size 80 x 65mm, operating at 415 ± 10% Volts, 3 phase, 50 Hz A.C. supply; Minimum Efficiency 75% - 1 No. (c) Duly insulated with 19mm thick closed cell nitrile rubber insulation cladded with aluminium sheets of 24G thickness and properly clamped to pump in two semi-circular sections as required. (d) Mounting framework with anti-vibration pads - 1 lot Note :- The taken down mono-block pump set shall be used as standby.

Taking down the old unserviceable Chiller pipe and supplying, laying/ fixing, testing and commissioning of 80mm dia (25mm thick insulation) M.S. 'C' class as per IS:1239 for chilled/hot water piping inside the building (with necessary clamps, vibration isolators, and fittings but excluding valves, strainers, gauges, etc.) duly insulated with closed cell Class 'O' Nitrile Rubber Elastomeric Insulation of density 40-60kg/cum, Thermal Conductivity of 0.035 W/mK at 0 deg. Celsius Mean Temp. and μ≥7000 (without any additional Vapour Barrier) and factory laminated 7 mil Glass Cloth (GC) covering; to be applied on pipes using manufacturer's recommended rubber-based adhesive in a blend of solvents, complete all as specified and directed.

Taking down the old unserviceable Chiller/Hot water pipe Supplying, laying/ fixing, testing and commissioning of 65mm dia (25mm thick insulation) M.S. 'C' class as per IS:1239 for chilled/hot water piping inside the building (with necessary clamps, vibration isolators and fittings but excluding valves, strainers, gauges etc.) duly insulated with closed cell Class 'O' Nitrile Rubber Elastomeric Insulation of density 40-60kg/m3, Thermal Conductivity of 0.035 W/mK at 0 deg. Celsius Mean Temp. and μ≥7000 (without any additional Vapour Barrier) and factory laminated 7 mil Glass Cloth (GC) covering; to be applied on pipes using manufacturer's recommended rubber-based adhesive in a blend of solvents, complete all as specified and directed.

Taking down the old unserviceable butterfly valve and supply and installing butterfly valve of size 40mm dia in the water pipelines by providing flanges, short pieces of mild steel pipes, Gaskets, nut bolts, and washers complete all as specified and directed. (for Hot water pipeline)

Taking down the old unserviceable Control Valve and supply, installation, testing and commissioning of CI 3-way temperature control valve 65mm dia, suitable for operation up?to 10 bar, with electronically operated actuator for AHUs. Water flow through the valve shall be regulated by rotation of the brass slipper between the main and the bypass ports; it shall be possible to manually rotate the brass slipper through 360° and interchange the main and the common ports, to facilitate installation at the site. All internals of the valve shall be rust-proof and the 'O' ring shall be of elastomeric insulation. The valve actuator shall be of the electronic type with a DC motor, the actuator's angle of rotation shall be 90°, it shall be without any limit switches, and shall be overload-proof. It shall have an indicator to indicate the position and a push-button to disengage the gear train for manual operation complete and humidistate & thermostat and control panel all as specified and directed. Note: Necessary humidistate & thermastat and control panel along with necessary cables are deemed to be included in the quoted rate.

Taking down the old unserviceable control valve and supply, installation, testing and commissioning of CI 3-way temperature control valve 40mm dia, suitable for operation up?to 10 bar, with electronically operated actuator for AHUs. Water flow through the valve shall be regulated by rotation of the brass slipper between the main and the bypass ports; it shall be possible to manually rotate the brass slipper through 360° and interchange the main and the common ports, to facilitate installation at the site. All internals of the valve shall be rust-proof and the 'O' ring shall be of elastomeric insulation. The valve actuator shall be of the electronic type with a DC motor, the actuator's angle of rotation shall be 90°, it shall be without any limit switches, and shall be overload-proof. It shall have an indicator to indicate the position and a push-button to disengage the gear train for manual operation complete and humidistate & thermostat and control panel all as specified and directed. Note: Necessary humidistate & thermastat and control panel along with necessary cables are deemed to be included in the quoted rate.

Taking down the old unserviceable elastomeric nitrile and S&F closed cell 19mm thick elastomeric nitrile rubber thermal insulation with aluminum foil laminated on one side, having thermal conductivity not exceeding 0.037 W/mK at a mean temperature of 20° C as per EN 12667, moisture diffusion resistance factor or ‘µ’ value of minimum 7,000 for base insulation material without the foil as per EN 12086, fire performance such that it passes Class 1 as per BS476 Part 7 for surface spread of flame and also fire performance of V0, HB as per UL 94, 1996, density without the foil between 40 to 55 kg/m³. The insulation material shall be FM (Factory Mutual) USA-approved and dust and fiber free. The Aluminium foil shall be 60 microns thick and its weight shall be 193gsm as per EN ISO 2286-2, with tensile strength 90N/15mm as per EN ISO 527-3 with elongation > 10% as per EN ISO 527-3 complete for Ducting all as specified and directed. (For duct insulation)

Taking down the old unserviceable Pan-Type humidifier and supply, installation, testing and commissioning of PAN-TYPE HUMIDIFIER suitable for 10 l/h evaporation rate (FCE LAB), having 6mm MS sheet welded construction with unitized stainless steel reservoir divided into two chambers from inside having 25mm thick fiber glass insulation cladded with aluminum foil, snap-acting humidistat, support legs for free-standing or wall hanging brackets for wall-mounting, factory mounted & wired humidifier control cabinet, steam outlet nozzle, water make-up, drain, over-flow, quick fill connections, immersion heaters made of copper or stainless steel, terminal blocks suitable for field power and control wiring and safety thermostat complete all as specified and directed. Note: The required water pipe lines for fixing of humidifier is deemed to be included in the quoted rate along with necessary electrical connections.

Taking down the old unserviceable expansion Water tank and Supply and fixing new HDPE rotational moulded polyethelene water storage tank with closed top, hoisting and fixing in position, connecting up pipes etc of capacity 500ltr with five layer as per latest IS-12701 or as per latest amendment, complete all as specified and directed.

Supply, installation, testing and commissioning in repair of GI Makeup connection, water piping 25mm dia with GI medium grade pipes and all necessary fittings i.e. bends, tees, reducers, flanges, structural support, etc. complete all as specified and directed.

Supply, installation, testing and commissioning in repair of GI Make up chilled water connection, water piping 20mm dia with GI medium grade pipes and all necessary fittings i.e. bends, tees, reducers, flanges, structural support, etc. complete all as specified and directed.

Supply, installation, testing and commissioning in repair of ball valve (brass insert) 25mm dia, designed and manufactured as per IS: 9890 (1981) and tested as per BS 6755 Part- I, with accessories complete all as specified and directed.

Supply, installation, testing and commissioning in repair of ball valve (brass insert) 20mm dia, designed and manufactured as per IS: 9890 (1981) and tested as per BS 6755 Part- I, with accessories complete all as specified and directed.

Taking down the old unserviceable galvanized steel and design Supply, fabrication installation of air distribution system made out of (PGI sheet) galvanized steel section ducting of thickness as per Indian Standard (IS: 655-1963) including 3mm rubber gasket, nut and bolts for jointing. The supply air duct and return air duct over the ceiling with necessary inbuilt stiffeners to maintain the desired noise level from AHU to the conditioned room, of commercial grade VIII as per IS-655 including the main air chamber completely insulated with TF quality EPS sheet 50mm thick density not less than 36Kg/cum and covered with chicken wire mesh, vapour barrier PVC sheet and 10mm thick cement and plaster (where ever passes through the true wall having height more than 6 meter and same has been finished as per existing) with suitable MS supporting arrangements from floor/RCC roof/ceilings/walls with adjustable dampers, vanes, etc complete as per specification and as per ducting layout marked tentatively on the site plan to meet the required qty of supply air in the conditioned room and to maintain the design parameters, air velocity and uniform distribution of air with all its accessories:-

Taking down the old unserviceable Acoustic Insulation and supply and application of Acoustic Insulation Inside the Duct with Engineered Nitrile Rubber open cell foam with Density 140-180Kg/cum and Class-1 Fire Performance and with antimicrobial as per ASTM E 21 using manufacturer's recommended Rubber-based Adhesive in a blend of solvents complete all as specified and directed. (The thickness of insulation 15 mm)

Supply, fixing and testing in replacement of hermetically sealed scroll compressor with in-built electric motor 3phase 440volt complete with oil suitable for 407/410 a Non CFC refrigerant gas etc of capacity 11/13 TR including disconnecting and reconnecting with inlet and outlet refrigerant copper pipe with brazing/soldering as required to make leak proof connection complete all as specified and directed by the Engineer-in-Charge.

Supply and fixing in repair of Safety valve any type as per direction by Engineer-in-Charge.

Supply and fixing in replacement including testing of thermostatic expansion valve of capacity 11/13TR and other works as requried including welding etc complete all as specified and directed.

Supply and fixing in repair liquid line filter drier of any type for refrigerant gas complete all as specified and directed.

Supply, fixing and testing of water flow switch including disconnecting and taking out existing unserviceable water flow switch any description and in any position complete all as specified & directed

Supply and fixing in replacement including testing of chiller water flow valve with electric control wiring and incl welding as required at site etc complete as specified and directed.

M&L necessary foundation for pump and motor and PCC hard standing on surrounding area, suitable foundation size and making good with and including PCC (1:3:6) type C-2, using 40mm graded stone aggregate complete all as specified and directed by the Engr-In-Charge. Note:- Size of foundation shall be decided by Engr-in-charge.

Note for above Item No.1 to 34 :- 1. Earthwork such as excavation, returning filling and removal shall be included in the quoted rate. 2. For MS/GI Pipes, any valve, nitrile ruber for insulation must be as per latest IS specifications. 3. Cutting, welding, finishing of welded/cutting portion by ruubing files, nut, bolts, washers, painting of one coat of red oxide primer and two coats of synthetic enamel paint including marking of flow direction on all newely connected pipes as directed by Engr-in-charge deemed to be included in quoted rate. 4. After completion of Repair/maintenance of AC plant testing will be done as per required parameter for the satisfaction of user/or as directed by Engr-in-charge and report in this regard will be submitted by contractor under intimation to this HQ. 5. It is ensured by Engr-in-charge the Repair/maintenance will be done as per policy in vogue.

Uma engineers

Radhe Krishn Engineering