8405 REPAIRS/REPLACEMENT AND MAINTENANCE TO U/S PARTS OF CENTRAL AC PLANTS OF VARIOUS BUILDINGS IN TECHNICAL AREA UNDER AGE (I) RnD, NSTL, VISAKHAPATNAM

Amount

M&L for cleaning/ servicing the cooling coil of 35 TR (2 x 35 TR) capacity plant at Manasi AHU of by air pressure method using air blower and cleaning the cooling coil with suitable cleaning agent, cleaning the AHU base tray completely and applying one coat of synthetic enamel paint inside the base tray, including greasing to AHU blower shaft bearing for smooth functioning, cleaning the AHU filter, replacement of unserviceable V belts etc. all as directed. Note:- V belts shall be measured and paid separately as 'Supply only' under respective items of this Schedule.

All as per Item No. 01 herein before but for 70 TR (3 x 35TR) capacity plant at C&G

All as per Item No. 01 herein before but for 260 TR / 280 TR capacity plant at Talwar / CNC

M & L for cleaning/ servicing of cooling tower, natural draught type/ FRP type of 35 TR (2x35TR) Capacity AC Plant at Manasi including cleaning of wooden/ PVC/ FRP louvers by scraping inside and outside, cleaning of water tank, cleaning and replacement of damaged/ choked nozzles, replacement of PVC pipe n. exc. 3 mtr in length; arranging, refixing in position of all louvers in correct manner and applying one coat of black bituminous paint inside and outside of water tank, cleaning of CT Fan blades, replacement of corroded nuts and bolts as per existing size including replacement of damaged/ broken louvers and unserviceable nozzles all as specified and as directed.

All as per Item No. 04 herein before but for 70 TR (3 x 35TR) capacity plant at C&G

All as per Item No. 04 herein before but for 260/ 280 TR capacity plant at Talwar/ CNC

M & L for complete leak testing the entire central AC plant of any capcity up to 60TR per unit consisting of compressors, condensers, chillers, AHUs with connected chilled piping, expansion valves and all accessories by flushing out the refrigerant gas present in the system, pumping Nitrogen gas at requisite pressure, locating leak positions, rectifying the leaks, including pressure testing and holding the pressure for 48 Hrs for observation for any pressure drop in the system and flushing out the complete system on rectification of leaks if any, vacuumising & de-hydration the complete system with heavy duty vacuum pump and removal of moisture and other foreign particles from the system complete including checking of all safety controls and parameters, testing & commissioning of the AC plant after charging the refrigerant gas all as directed by the Engineer-in-Charge. [Note: Supply & charging refrigerant gas will be measured and paid separately]

All as per Item No. 7 herein before but for AC Plant of capacity exc. 60 TR but n.exc. 140 TR

M & L for de-scaling the condenser unit, shell and tube type of 35TR capacity by circulating the approved cleaning agent / diluted hydrochloric acid at the appropriate ratio depending up on the scale deposits till removal inside the copper tube by means of circulating the de-scaling chemical through condenser by pressure feeding method after disconnecting condenser water lines, opening the end covers, scraping/cleaning the condenser water tubing, removing the scales and refixing the dismantled part, end cover with 3mm thick rubber gasket set, re-connecting with the system etc. including minor repairs all as specified and as directed.

All as per Item No.9 above herein before but of 130 TR capacity

All as per Item No. 9 above herein before but of 140 TR capacity

M&L for Disconnecting electrically and mechanically mono-block pump set of 15 to 20 HP capacity of any make from the existing position by arranging dummy plates to suction and delivery line, removing from the existing position, opening up, varnishing to stator winding with class I varnish, replacement of burnt stator & rotor with super enamelled copper wire of existing gauge,heating/ baking the same, removal of damaged motor bearing, cleaning the rotor and re assembling the motor, cleaning the impeller of pump, supply & replacement of shaft bearings, gland rope, gland bolts &nuts, greasing the pump bearing, fixing back at original location with proper alignment, connecting and testing complete all as specified.

All as per Item No. 12 above herein before but of 10 to 12.5 HP capacity

All as per Item No. 12 above herein before but of 5/ 7.5 HP capacity

M & L for disconnecting/ Dismantlig (electrically & mechanically) 3 phase, 440 volts, 50 Hz electrical motor from the monoblock pump set of 20 HP capacity and shifting to workshop, opening the motor end cover, taking ou trotor, taking out burnt stator winding, cleaning the stator and rewinding the motor with appropriate gauge, weight and turns of super enamelled copper wire using proper insulating material, varnishing with Class-I varnish, heating/ baking, reassembling the motor completely and brought back to site, fixing back duly coupled with the pump in prope aignment, connecting and testing complete all as specified. Note: Insulation of windng shall be Class 'B' upto 7.5 HP and Class 'F' for 10 HP and above.

All as per Item No. 15 above herein before but of 10 to 12.5 HP capacity

All as per Item No. 15 above herein before but of 5/ 7.5 HP capacity

Supply only Wedge (V) Belts B - 134 for compressor & motor/ AHU & motor. [Make: Fenner/ Yule/ ContiTech]

Supply only Wedge (V) Belts B - 95 for compressor & motor/ AHU & motor. [Make: Fenner/ Yule/ ContiTech]

Supply only Wedge (V) Belts B-2253 LP /B87 for compressor & motor/ AHU & motor. [Make: Fenner/ Yule/ ContiTech]

S&F in repairs Single phase preventer Heavy duty relay for protection against single phasing, phase reversal condition, unbalance condition, with inbuilt timer working on 440V, 50Hz power supply complete all as specified and directed. [Make: Minilec 3NA-30-323 OR techno commercial equivalent in L&T/ GE/ Siemens]

S&F in repairs Starter Push Button switch with 1 NO + 1 NC complete working on DC/ AC supply up to 16 Amps capacity all as specified and as directed [Make: L&T ESBEE/ Siemens]

S&F in repairs 4 pole contactors AC operated rating at 415 Volts, AC1 45 Amps rating with 2NO + 2NC auxiliary contacts with operatabe coil voltage 24 volts to 415 volts AC/DC with front/ side mounted Add On blocks as per site requirement. [Make: ABB/ Siemens/ Schneider/ L&T]

All as per Item No. 24 herein before but of AC1 rating 30 Amps

All as per Item No. 24 herein before but of AC1 rating 60 Amps

S&F in repairs Thermal Overload relay, 18 to 42 Amps, direct mounted on contactors [TA42DU series of make: ABB or equivalent in GE/ L&T]

S&F in repairs Thermal Overload relay, 22 to 80 Amps, direct mounted on contactors [TA75DU series of make: ABB or equivalent in GE/ L&T]

Supply only Refrigerant gas 'R- 134a' in manufacturer's sealed cylinder. Note:- (i) Empty cylinder will be returned to contractor on completion of work (ii) Net weight of refrigerant gas shall be measured and paid under these items.

Supply only filling of compressor oil suitable for compressor of Make: Carrier all as directed by Engr-in-charge.

Supply only filling of compressor oil suitable for compressor of Make: Voltas all as directed by Engr-in-charge.

S&F 25mm bore ball brass valves, high pressure, with polythene float and fly nut complete, screwed for iron pipe or brass ferrule and fixed in repairs. [Make: Leader/ Zoloto/ Lakshmi/ Sakthi]

Supply and fixing of PCB board with flexible cards by replacing the damaged/ worn-out electronic components/ ICs with heat sinks, programming automation complete for Central AC plants of various capacities from 70 TR to 160 TR complete including testing and commissioning all as directed.

S&F in repairs pneumatic safety valve for condensers of central AC plants of capacity 35 / 130 / 140 TR. [Make: Castle/ Brassolite/ Henry]

S&F in repairs gun metal Ball vales 15mm dia with screwed ends fixed complete all as directed. [Make: Leader/ Zoloto/ Lakshmi/ Sakthi]

All as per item No.35 above herein before but 25 mm dia

S&F in repairs flow control limit switch/ sensor as per the existing make/ model complete all as specified and as directed. [Make: Castle/ Rapid controls/ Honeywell]

Supply and fixing of water pressure meter dial type up to 7 Kg/cm2 complete all as specified and directed. Make: Guru/Danfoss

Supply and fixing of temperature meter dail type with stop valve 0 to 30 degree cebntigrade with complete acessories by removing of the old unserviceable meter complete all as specified and directed. Make: H- guru / danfoss/ universal

Removal of the damaged HP cut out, supply and fixing of High Pressure cut out on the compressed / pressurised gas lines complete all as specified and directed.

Removal of the damaged LP cut out, supply and fixing of Low Pressure cut out on the compressed / pressurised gas lines complete all as specified and directed.

Removing of the defective unserviceable temperature sensor and supply and fixing of temprature sensor / thermostat controller along with necessary controll wiring and acessories. Make: Simens/ Honey well

Removing of the defective unserviceable humidity sensor and supply and fixing of humidity sensor/ controller along with necessary controll wiring and acessories. Make: Simens/ Honey well

Supply only HRC fuses suitable for Screw compressor control panel of capacity 130 TR suitable

Disconnection and removing the LT cable connection from the Air Circuit breakers of capacity up to 1600 Amps AC 440 volts from existing LT panel including Complete Servicing of ACB for smooth functioning and operation with repair/replacement of worn out parts such as Switches, Arcing contacts, Main contacts, Jaw contacts, tripping coil, charging motor, relays etc with new spare parts suitable for the existing ACB's make,specifications complete and refixing the same in original position, testing complete all as specified and as directed by Engineer in charge. Make of existing ACB's : C & S / Note:- (i) Spares required for servicing are measued and paid separately under relevant items.

Supply only Isolating Contacts 800/ 1600 A suitable for LT ACBs

Supply only shunt trip coil 230/ 440 Volts suitable for LT ACBs

Supply only UV coil 230/ 440 Volts suitable for LT ACBs

Supply only Rack-in Rack-out mechanism suitable for LT ACBs

Disconnection and removing the unserveciable MCCB & Supply and fix new MCCB with thermal-magnetic release Conforms to IS/IEC 60947-2 & IEC 60947-2 4 pole ,415 V ,400 A , 50 Hz , breaking capacity of 36 KA , complete all as directed by Engineer in charge. Make : scheinder, ABB,Legrand,Siemens

All as per item No.50 above here-in-before but of capacity 250 A , 36 KA

All as per item No.50 above here-in-before but of capacity 200 A , 36 KA

M&L for Preparation of old painted surface of scrapping of existing cooling tower & connected items by applying two coats of synthetic enamel paint over a coat of zinc chrome primer on existing complete all as specified and directed by Engr-in-charge.

M&L for Preparation of old painted surface of scrapping including valves, strainers etc and applying two coats of synthetic enamel paint over a coat of zinc chrome primer on existing pipe line surfaces complete all as specified and directed by Engr-in-charge.

M&L for disconnecting the existing rusted MS pipe line of any size from their existing position including all accessories complete all specified and directed by Engr-in- charge.

M & L for Insulation of M S Pipe with PUF slab 30 mm thick with and including applying bituminuous compound and GI cladding with 26 gauge GI sheet complete of size 50 mm dia complete all as specified.

M & L for Insulation of M S Pipe with PUF slab 40 mm thick with and including applying bituminuous compound and GI cladding with 26 gauge GI sheet complete of size 150 mm dia complete all as specified.

SRI SURYA PROJECTS