8259 REPAIRS, MAINTENANCE TO CENTRAL AC PLANTS IN VARIOUS BUILDINGS UNDER AGE I RnD, NSTL, VISAKHAPATNAM

Amount

M&L for cleaning/ servicing the cooling coil of AHU of 110 TR AC plant at P-4 Bldg (3 units) by pressure air 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. 1 herein before but for 70 TR capacity plant at Manasi (2 units)/ CNG

All as per Item No. 1 herein before but for 260/ 280 TR (2 units) capacity plant at Talwar / CNC [2 units each]

M&L for cleaning/ servicing of cooling tower, natural/ forced draught type with FRP body of 110 TR AC plant in P-4 Bldg including cleaning of 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 synthetic enamel paint of existing colour on outside of water tank, cleaning of CT fan blades; replacement of corroded nuts and bolts as per existing size including replacement of unserviceable nozzles all as specified and as directed.

All as per Item No. 04 herein before but for 70 TR capacity plant at Manasi/ CNC

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 capacity up to 60 TR capacity/ chiller 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 55 TR capacity by circulating the 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. all as specified and as directed.

All as per Item No. 9 herein before but of 35 TR capacity

All as per Item No. 9 herein before but of 130/ 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, 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 herein before but of 10 to 12.5 HP capacity

All as per Item No. 12 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 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: L&T/ GE/ Minilec/ 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. 21 herein before but of AC1 rating 30 Amps

All as per Item No. 21 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- 22' in manufacturer's sealed cylinder.

Supply only Refrigerant gas 'R- 134a' in manufacturer's sealed cylinder. Note for Sl. item No 26 & 27:- (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.

M&L for draining out compressor oil from the sump and filling new compressor oil SW220 mineral grade up to required level complete all as directed. [Make: Castrol/ Totaline/ Servo/ BP/ Sheetal N-68]

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

M&L for carrying out repairs to PCB boars/cards by replacing the damaged/ worn-out electronic components/ ICs with heat sinks 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/ 40/ 60/ 80/ 120/ 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. 32 herein before but 25mm 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]

S&F in repairs water pressure gauge dial type 4" dia 0 to 7 kg/cm² all as directed. [Make: Fiebig/ Heibig/ H.Guru]

S&F in repairs temperature meter dial type with stop valve 0 to 30° centigrade with complete accessories all as directed. [Make: Dimple/ Tedington/ H-guru/ Danfoss/ Universal]

S&F in repairs HP cutout on compressed/ pressurized gas lines complete all as directed. [Make: Danfoss / Indfos]

S&F in repairs LP cutout on compressed/ pressurized gas lines complete all as directed. [Make: Danfoss / Indfos]

S&F in repairs temperature sensor/ thermostat controller along with necessary control wiring and accessories complete all as directed. [Make: Siemens/ Honey well]

S&F in repairs humidity sensor along with necessary control wiring and accessories complete all as directed. [Make: Siemens/ Honey well]

M&L for overhauling of screw compressor of capacity 63 KW, Voltage range 342-456 Volts, RPM 2900, Refrigerant R-134a, operating pressure 2.0/2.0 (High), 0.45/1.2 (low) including removing all the electrical connections, dismantling the compressor, shifting to authorized OEM work shop open the compressor cabinet after evacuation of refrigerant gas to empty cylinders and checking for fault, rectify the fault by replacing the worn out spare parts such as bearings, 'O' rings, compressor oil filter, driers, rewinding the copper core, reassemble the compressor after making serviceable, shifting to plant premises, refixing and charging the refrigerant gas including topping up and testing including control panel board complete all as directed by Engineer-in-charge. Make: Carrier Model No:06NVV2300S5NA-A00 Note: Spares & oil shall be measured and paid separately under respective items of this BOQ

Supply only bearings set suitable for screw compressor of capacity 60KW described under Sl. Item No.41 herein before

Supply only 'O' ring set suitable for screw compressor of capacity 60KW described under Sl. Item No.41 herein before

Supply only Internal oil filter suitable for screw compressor of capacity 60KW described under Sl. Item No.41 herein before

Supply only External oil filter suitable for screw compressor of capacity 60KW described under Sl. Item No.41 herein before

Supply only Drier cores suitable for screw compressor of capacity 60KW described under Sl. Item No.41 herein before

Supply only HRC fuses suitable for control panel of screw compressor of capacity 60KW described under Sl. Item No.41 herein before

Supply only Control panel PCB board suitable for screw compressor of capacity 60KW described under Sl. Item No.41 herein before

M&L for complete replacement of Internal Oil filter 3 microns [Cat No. 2001972] and External Oil filter 6 microns [Cat No. 2000144] for chiller units of 120/140 TR of Carrier Make chiller plants Model No. 30 MXC 140/ 120 complete with necessary ferrules, connectors and coupling accessories and testing all as specified and as directed.

M/s Chandu Lavanya Engineers Contrctors