NCTPS I SE MI circle Boiler Maintenance Division Annual Overhaul works for the year 24 25 Specification No 106 24 25

Amount

De-coupling / Coupling of FD Fan motor with fan. Including cost of consumables and T&P’s.

Renewal of DE bearing: Loosening the motor bed bolts, shifting a motor for accessibility, arrangement of fixtures and removal of fan coupling, arrangement of fixtures and removal of DE Bearing along with the housing. Checking the bearing mounting area, measuring, rectifying minor defects and polishing. Heating the new bearing to 120 degree and soaking in the oil bath/Induction heater, and mounting. Mounting of coupling by heating, positioning and re-fixing of motor in the original position. Including cost of consumables and T&P’s. (The Required Material will be supplied by TANGEDCO)

Renewal of NDE bearing : Lifting up the shaft arrangement of fixtures, removal of NDE bearing along with the housing, heating up new bearing to 120 degree by soaking it in oil bath/induction heater and mounting of bearing along with the housing and bring down the shaft to its original position. Including cost of consumables and T&P’s. (The Required Material will be supplied by TANGEDCO)

Charges for cleaning of FD fans suction hood inside and silencer inside assembly. Including cost of consumables and T&P’s.

Renewal of DE bearing housing: Drawl of DE bearing housing from stores, transporting to work spot area, cleaning of non corrosion paint and devolution the released housing to stores, including cost of consumables and T&P’s. (The Required Material will be supplied by TANGEDCO)

Renewal of NDE bearing housing: Drawl of NDE bearing housing from stores, transporting to work spot area, cleaning of non corrosion paint and devolution the released housing to stores, including cost of consumables and T&P’s. (The Required Material will be supplied by TANGEDCO)

Renewal of mounted bolts of diffuser delivery flange in FD fan : Work involves gas cutting and removal of existing wornout mounted its, remove the rust & flakes and complete cleaning of flanges, provide new asbestos rope bolting with new HT bolts & nut and torque tightening, including cost of consumables and T&P’s. (The Required Material will be supplied by TANGEDCO)

Overhaul of FD fan IGV includes dismantling of all link rods, cleaning & greasing, dismantling of all guide rollers, cleaning & greasing, checking and renewal of bearings if required and assembling of IGV and calibration of IGV for perfect closing/ opening, including cost of consumables and T&P’s.

Alignment of fan and motor: This work includes taking pre alignment reading, complete dismantling of motor bed bolts and fan housing bolts. Lifting, cleaning of motor foot, base plate, housing base and positioning. Aligning the fan and motor axially and radially within the allowable limits. Box up the fan bearings, checking tightness of all bolts, couple the fan and motor and trial run of the fan, including cost of consumables and T&P’s.

Rectification of damaged portion in FD fan suction chamber, impeller casing diffuser: This work includes complete cleaning of casing patch up by fabrication and fixing of M.S. plate required size at damaged portions in fan casing and welding, including cost of consumables and T&P’s. (The Required Material will be supplied by TANGEDCO)

Grouting of DE bearing/ suction/ impeller/ diffuser pedestal : This work involves arrangement of shutter around the base plates, mixing, pouring of grouting cement, including cost of grouting cement CERAGROUT-40, consumables and T&P’s.

Rectification of wornout shaft cover protection tube assembly in FD Fan: This work includes reconditioning by Cutting, threading of holes and welding in flanges, surface finishing, including cost of consumables and T&P’s.

Static balancing of FD fans shaft & impeller : Work involves rotate the rotor, marking and identify the unbalance point in impeller, adding trial weight, ensuring balance of rotor and finally welding of balance weight in impeller and trial run, including opening & closing of manhole doors, necessary arrangement for approaching the rotor, including cost of consumables and T&P’s.

Renew the weaken FD Fan IGV base : Work involves disconnecting and dismantling of IGV link rod from actuator. Dismantle the actuator base plate and PCC concrete. Making holes in the ground through diamond core cutting machine, fixing and levelling foundation bolts, reconcreting, fixing of base plate with channel, apply two coats of anticorrosive paint and remounting of actuator, reconnecting of links & checking the IGV open/ close operation by manually and normalizing, including cost of consumables and T&P’s.

Leading, lifting and transportation of Iron and steel materials, from stores to site including hire charges for mobile crane.

Strengthening of steel supports for FD fan outlet ducts A & B pass at 'O' mtr elevation work involves Fabrication and Erection of new M.S angles and channels for Strengthening of transition duct supports. Including cost of consumables and T&P's.

Charges for one coat of painting the gear boxes and all inspection door, suction hood, motor hood and platform, thorough cleaning and painting of one coat of red oxide in FD fan suction hood assembly (non insulated area) with enamel paint (including cost of paint). Including cost of consumables and T&P's.

KAARTHIKEYAN ENTERPRISES (BID ID -1080750)