TTPS Mech II BM Unit IV Overhauling of FD fans A B of Model AN18e6 and Replacement of Foundation bolts of suction chamber Impeller housing in FD Fan 4B in Unit IV for the year 2024 2025

Charges for overhauling of SAD 3 gear drive damper cleaning air duct up to air pre heaters and attending minor repair works on duct and expansion joints and dampers etc.

Charges for de-coupling and releasing FD fan motor from its bed with motor roof, motor bolts arresting, removal of fan DE bearing pedestal, DE bearing housing, DE bearing, removal of coupling by oil heating, shaft cover, IGV three blades, impeller, bolts, impeller arresting, removal of NDE bearing grease pipe, NDE bearing end cover, NDE bearing housing, NDE bearing, moving of shaft towards NDE side and arresting.

Charges for removal of all the connection bolts in the suction chamber and diffuser inner flange and outer flange casings, providing supports for suction chamber and diffuser casing, Dismantling the impeller housing by removing housing bed bolts and to bring it to the ground level and cleaning the base plate of the impeller housing

Renewal/ Releasing of worn out/Existing shaft and impeller: Work involves loosening of mounted bolts of shaft & impeller, dismantle. Gas cutting of manhole in fan casing for removal of shaft. Leading, lifting, move the shaft to outside the fan casing by slinging and dismantle the screw ring. Removal of impeller to from the fan casing. Thorough cleaning of new/ released existing shaft, impeller and take measurements. Leading, lifting and positioning of new/ released impeller and shaft. Mounting of screw ring in the shaft after thorough cleaning and inspection. Bolting and torque tightening of shaft and impeller (After mounting of bearing & housing and positioning) and remounting the stabiliser top half, shaft cover and welding of manhole in casing after completion of work including drawal, devolution ( if required).

Charges for cleaning of FD fan DE bearing mounting area, NDE bearing mounting area and impeller mounting area, blue matching of NDE bearing housing with pedestal, blue matching of DE bearing housing with pedestal and leveling.

Charges for moving of shaft towards FD fan NDE side, tightening the impeller, moving of shaft towards DE side, mounting of new DE bearing and new NDE bearing on shaft, mounting impeller on shaft, mounting of DE bearing housing, NDE Bearing housing on shaft, positioning, oil heating of coupling and then mounting, mounting of IGV three blades.

Charges for alignment of FD fan DE bearing, checking face out, clearance, alignment of NDE bearing, checking face out, clearance, alignment of impeller, alignment of IGV assembly with shaft, re-mounting of impeller housing, re-mounting of motor, motor roof, greasing DE bearing, NDE bearing, IGV assembly. Coupling of fan with motor, trial run.

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 leveling foundation bolts, reconcreting, fixing of base plate with channel, apply two coats of anticorrossive paint and remounting of actuator, reconnecting of links & checking the IGV open / close operation by manually and normalizing

Charges for transport of new/ existing impeller housing, cleaning the impeller housing completely and lifting the new/existing impeller housing and positioning it on the pedestals fixing the suction chamber side and diffuser casing inner flange and outer flange sides with the connection bolts, then removing the supports fixed to casing.

Renewal of foundation base plates of Suction, impeller, diffuser casings in FD Fan : This work includes loosening of foundation bolts, lift the casing by jack, providing Supports, dismantling of existing grouting cement, removal of packer plates. Cutting and removal of existing wornout foundation base plates. Surface preparation by gauching & grinding the flange edges. Fix the new foundation base plates, providing packer plates to get zero level. Complete welding and normalising. Apply two coat of anticorrossive paint.

Charges for leveling the impeller housing and alignment of the impeller housing with respect to outer bearing housing.

Charges for aligning the diffuser assembly with impeller housing

Charges for cleaning of FD fans suction hood and silencer assembly.

Charges for 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.

Charges for alignment of motor with FD Fan

Charges for lifting the FD Fan motor from the bed after dismantling the power cable, earth and top roof, grinding the bed base plates up to 3 mm after punching, repositioning the motor, reassembling the top roof.

NTN make Bearings 22224EAD1C3

NTN make Bearings 22316EAD1C3

BIRUNTHA ENGINEERING CONSTRUCTION (BID ID -1069801)