NCTPS I SE MI circle Boiler Maintenance Division Annual Overhaul works for the year 24 25 Specification No 159 24 25

Amount

Charges for De coupling / coupling of PA Fan motor with fan. Including consumables and T&P's.

Charges for cleaning and patch welding in damaged area of PA fans suction hood inside and silencer inside assembly. Including consumables and T&P’s.

Charges for Inspection of PA fan Impeller and shaft at inside the casing, entering through the manhole door, inspection and rectification of impeller radial seals, axial seals and their clearances, conducting Dye Penetrant test (DPT) on impeller blades, rectification of defects in manhole door and door locks, attending minor repair works. Including cost of consumables and T&P's.

Charges for Loosening the motor bed bolts, shifting a motor for accessibility, arrangement of fixtures and removal of fan coupling, arrangement of fixtures, Lock washer lock released and lock nut dismantled and removal of DE bearing along with the cooler and housing, checking and measuring the existing bearing, spacer ring, cooler and bearing seating radial surface of shaft. Reassembling of existing bearing / new bearing by heating upto 120 degree by using hot oil soaking in tub / Induction heater, mounting along with cooler and housing, tightening of locknut with lock washer. Mounting of Drive End coupling by heating and bring down the shaft to its original position. Including consumables and T&P's. (The Required Material will be supplied by TANGEDCO)

Charges for Lifting up the shaft, arrangement of fixtures, lock washer lock released and lock nut dismantled and removal of NDE bearing along with the cooler and housing, checking and measuring the existing bearing, spacer ring, cooler and bearing seating radial surface of shaft. Reassembling of existing bearing / new bearing by heating up to 120 degree by using hot oil soaking in tub / induction heater, mounting of spacer ring, cooler, bearing along with the housing and bring down the shaft to its original position. Including consumables and T&P's. (The Required Material will be supplied by TANGEDCO)

Replacement of existing / new PA fan DE / NDE bearing housing: Work involves checking the bearing mounting area of housing, measuring, rectifying minor defects and polishing, blue matching the housing with pedestal, positioning bring down the shaft to its original position. Including consumables and T&P's. (The Required Material will be supplied by TANGEDCO)

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.

Overhaul of IGV Left and Right side and its gearbox: This work includes loosening of IGV casing bolts and removal of IGV assly from fan casing. Dismantling of connecting rod, guide ring, flaps, angular joints and IGV blades. Cleaning and checking the above internals for any defect and attending repair works and replace the wornout internals. Re assembling, retapping of grease nipple points, providing new grease nipple (grease nipple contractor scope) greasing, aligning and bolting the IGV set and normalizing for smooth operation. Removal of gearbox by chain block from its bed, removal of mounting channel. Repositioning and Fixing the gear box. Opening the actuator gear box, inspection of gears and filling up the lubrication. Including cost of consumables and T&P's.

Renew the weaken PA Fan IGV base: Work involves disconnecting and dismantling of IGV link rod from actuator. Dismantling of actuator base plate and PCC concrete, Making holes in the ground through diamond core cutting machine, fixing and levelling foundation bolts, re concreting, fixing of base plate with channel, apply two coats of anti corrosive 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.

Rectification of damaged portions in PA fan casing: 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.

Charges for cleaning of PA fans lube oil tank and flushing of lube oil lines, including cost of consumables and T&P’s.

Hydralic testing of PA Fan lube Oil Cooler, labour charges for dismantling and cleaning, including cost of consumables and T&P’s.

Labour charges for Hydraulic testing of the PA fan Lube oil cooler @ 15 Kg/Cm² pressure for 30 minutes in the presence of Board Incharge, including cost of special tools for tube cleaning & hydraulic testing, consumables and T&P’s.

Charges for Overhauling of PA fan lube oil pump, including cost of consumables and T&P’s.

Checking the lubricating oil for any contamination, oil draining and renewing the oil for PA fans Bearings, including cost of consumables and T&P’s.

Dismantling of entire tie rod link mechanism from actuator to IGV, reconditioning of worn out link holes by metal filling and machining to required dia, fabrication of new link connecting pin for suitable dia with end washers and cotter pin, retapping of existing grease nipples in links, Providing new grease nipple, provide gun metal bush at actuator drive end link, reassembling. The entire actuator link assembly at intact position without any play, ensuring of actuator end operation and IGV end connecting linked tie rod operation without any sluggishness and commissioning in position. Including consumables and T&P's.

Charges for renewal of damaged shaft and impeller in PA fan: Work involves dismantling of left and right side suction chamber and spiral casing by Gas cutting the mounted bolts of casing & lay birth seal and dismantle the shaft & impeller. Leading, lifting, move the shaft to outside the fan casing by slinging. Through cleaning of new shaft, impeller and take measurements. Leading, lifting and positioning of new impeller to the shaft after through cleaning and inspection & bolting and torque tightening of impeller to the shaft (After mounting of bearing & housing and positioning) and remounting the new shaft with impeller from its original position of fan DE & NDE pedestal, laying the asbestos rope in casing flange, refixing the casing by bolting and torque tightening of casing and providing laybirth seal and tag weld the impeller bolt and normalizing, including drawl, devolution, consumables and T&P’s. (The Required Material will be supplied by TANGEDCO)

Renuga Enterprises (BID ID -1138222)