U-3,6,8&9 PRESENTATIOPN DT.15.07.2024.pptx

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1. CSTPS OVERHAUL FY 24-25

2. AOH/COH planning for FY 2024-25 (This revised planning is as per HO letter no. 4768 dtd. 10.05.24 ) Sr. No.  Unit  Type of Overhaul  Boiler validity  From date  To date  Period  REMARK 1.  Unit- 3  AOH  22.08.2024  08-08-2024  01-09-2024  25 days  Revision of Schedule submitted vide letter no. 385 dt. 06.06.24 (From 08.08.24 to 01.09.24 for 25 days ) 2.  Unit- 6  COH  15.02.2025  01-08-2024  30-08-2024  30 days  3.  Unit- 9  COH  31.08.2024  01-07-2024  30-07-2024  30 days  Boiler validity extended  upto 31.08.2024- overhaul defered 4.  Unit- 8  SSD  02.10.2024  13-07-2024  01-08-2024  20 days  Revision of Schedule submitted vide letter no. 9643 dt. 04.07.24 (From 13-07-2024 for 20 days )-

3. LAST OVERHAUL CARRIED OUT UNIT-3 COH PERIOD :05.09.21 TO 01.11.21  UNIT-4 AOH PERIOD :27.07. 23 TO 09.09.23   UNIT-5 COH PERIOD :22.05.23 TO 04.10.23  UNIT-6 AOH PERIOD: 17.10.21 TO 28.11.21  UNIT-7 AOH PERIOD :15.06.22 TO 13.08.22  UNIT 8 COH PERIOD : 06.09.22 TO 12.10.22 UNIT 9 AOH PERIOD : 15.07.21 TO 18.08.21

4. Major Works U-3,6,8 & 9

5.                                          MAJOR WORKS Sr. No. Work Description MATERIAL+WORK AVAILABILITY  Status Benefits 1 Cold end Basket replacement PO placed ,Partial  material received, remaining  delivery awaited ( upto July-24) HR improvement & Loadability improvement 2 Coal compartment assembly replacement Material available, work proposal 1100147994  is in Tender Refloated stage HR improvement & Loadability improvement 3 ID fan Impeller replacement Impeller available, work proposal 1100149029, T-2232 is in process at Eligibility stage Improve ID margin 4 Major Duct replacement (APH outlet to ESP inlet) PR  1100156895 is at TEC stage  Improve ID margin 5 HP tube replacement Boiler first Pass and Second Pass Material available, and Work PR 1100148267 at DPO  and   PR 1100153055 is price bid open. Reduce Tube leakage 5 Boiler thickness survey PR 1100156163  is  in draft PO stage. Reduce Tube leakage 6 SADC work PR 1100155555 is in draft PO stage. Provision for isolation and regulation of Hot air to Coal mill 7 TG overhaul work Turbine spares proposal at CPA (Order placed material awaited), work proposal  1100153739 is in draft PO stage. To improve loadability and Efficiency. 8 CVSM –governing element overhaul Turbine spares proposal at CPA (Order placed material awaited) ,work proposal 1100153739  is in draft PO stage. Reliability of Governing system UNIT-3

6. OVERHAUL PREPAREDNESS INDEX FOR UNIT-3 PROPOSED AOH  FY 2024-25 SECTION % of availability % of availability MATERIAL Work Contract  BM-I 86% 80% TM-I 84% 80% EM-I 89% 87% TIC-I 88% 94% TOTAL  PREPAREDNESS  87% 85% Total Prepardness Index of Unit-3 86%

7. UNIT-6 MAJOR WORKS Sr.No . Major Works Material Availability  & Work Contract availability Benefit 1 HPT Replacement Work, IPT, LPT- Overhauling Work    For HPT refurbishment,  CAPITAL PO DISPATCHED , Clamping piece supply PO under despatch. Reduction in CRH Temp & thereby improvement in HPT Efficiency, HR & TG Efficiency. 2 Generator Capital Overhaul    1100157411 : PO Dispatched Reliability improvement 3 Exciter Vibration Rectification Work    1100157411 :  PO Dispatched Turbine Brg . Vibration High Problem shall be resolved  4 Condenser Tube Cleaning by High pressure jetting & bulleting Work   PO available  4550021546 Improvement in Condenser vacuum & thereby HR  5 HP Valves Servicing Work    PO available  4550021573 To reduce downtime, extend life expectancy and reduce long-term operational costs  6 DCS upgradation Material received (95%) , consent   is also received from M/s BHEL.Pre shut down activity going on Smooth and trouble-free Operation. Reliability improvement 7 GTR replacement  Material New GTR delivered at site on dtd. 24.05.2024 and Repaired 2 nos. Of GTR received at site on dtd. 18.06.2024 Reliability improvement

8. UNIT-6 MAJOR WORKS Sr. No. Major Works Material Availability  & Work Contract availability Benefit 8 Coal compartment assembly replacement Work   Supply PO placed, Work proposal is in process  1100151001 Tender comm eligibility Maximum availability of coal cycle & further to improve effectiveness  9 Work of Complete replacement of Unit-6 bottom ash hopper during U-6 COH, CSTPS , Chandrapur .   PR is in process 1100158965- Draft Tender . Bottom Ash hopper buldged , Main supporting I beam tilted bend on chimney side, which may leads to imbalance of hopper. Also its working life is completed more than 30yrs , hence replacement is essential to avoid major failure. ID fan margin increased clinkering tendency at ash feed gates U-6 side will be reduced.  10 LTSH Replacement (Capex Scheme), Replacement of Reheater Outlet Header Nipple Bends   Material available. Work PO placed  4500130311 For Reduction in BTL  11 PA Fan 6A Foundation Work     Proposal in process -  1100150207- Draft PO in process To improve availability at sustainable basis & further reduction in generation loss.  12 ID Fan 6A / 6D Impeller Replacement Work   Proposal in process – 1100149527  - PO Despatch To improve availability at sustainable basis & further reduction in generation loss.   13 Flue Gas / Hot Air Duct Repairing Work   Proposal in process -  1100146434  Eligibility To improve ID margin & further improvement in combustion efficiency. 

9. UNIT-6 MAJOR WORKS Sr. No. Major Works Material Availability  & Work Contract availability Benefit 14 ESP Internal Replacement Work   Capex 'D' Pass Proposal in process. Works PR  1100150275 PO despatched. Supply PR 1100155244- Tender  Refloat works PR 1100144876- Eligibility Project to execute 'D' Pass work during O/H To improve collection efficiency  15 FBTS - A,B,C & D: Retrofitting, Testing Trials and Commissioning.  1100145999 (T-213) - Draft PO To have a Fast, safe and reliable Bus transfer operation in an intelligent manner between UAT I/C and STN Tie I/C at all times so as to prevent any generation loss on account of mal-functioning or spurious operation of existing old relay based Bus Transfer System. 16 220V and  24V DC Battery Charger : Retrofitting, Testing Trials and Commissioning.  1100146078  (T-212)  Refloat Battery Chargers are benificial for pre-requisite for healthiness and optimal performance of Battery Banks also healthiness and reliability of operation of Battery chargers and the corresponding 220V/24V DC Power system at all times.  17 1X75 KVA UPS SYSTEM : Retrofitting, Testing Trials and Commissioning. 1100145405 (E-1439) PO Despatched   For healthiness and reliability of  operation of UPS System, Advanced-technology IGBT based 1X75 KVA UPS system is required, which is compatible and adequate to our existing system  for smooth operation of running plant and future load requirements in DCS upgradation.

10. UNIT-6 OVERHAUL SCHEDULE 01.08.2024 TO 30.08.2024  COH-30 DAYS OVERHAUL PREPAREDNESS INDEX FOR UNIT-6 PROPOSED COH FY 2024-25 SECTION % of availability % of availability MATERIAL Work Contract  BM-II 90% 74% TM-II 88% 99% EM-II 81% 81% TEST-II 94% 99% I&C-II 88% 93% ODP-II 93% 80% TOTAL  PREPAREDNESS  89% 88% Total Prepardness Index of Unit-6 89.29%

11. UNIT-8  IMPORTANT WORKS Section​ Major Works​ Material Works​ Contract Availability Benefits BM-III Duct patching Material-AVAILABLE Works-p roposal is in process 1100155995 - PO DISPATCHED. APC reduction. ID/FD/PA Fan loading lower A/H washing & seal replacement Material PR-1100154055 PO dispatch.  Works PR-1100155698 PO dispatch APH performance improvement and APC reduction (minimize ID fan loading) Fans Servicing Material available Regular AMC for works Reliability of Fans will increase. Critical valve servicing Through AMC  Steam loss minimsing . Specific steam consumption minimise   Boiler tube thickness survey Major anticipated tubes available for other PR will be initiated. Material Available. Works  PR No. 1100155195  IS PO DISPATCH. PR-1100155406 IS  PO DISPATCH. Minimise forced outage. BTL reduction. B. T. & S. A. D.C. work Material  available1100157595 PO dispatched Boiler combustion improvement. Unburnt reduction

12. UNIT-8  IMPORTANT WORKS Section​ Major Works​ Material Works​ Contract Availability Benefits TM-III HPT Module replacement Material  available. Loadability will increase by 16% Critical valve servicing PO available(unit-9) Specific steam consumption minimize  Condenser Cleaning PO available Improvement In vacuum C&I-III Replacement of Main Turbine Speed sensor. Material available. For online measurement of Turbine speed. Replacement of Main Turbine HP rotor expansion sensor. Material available. To ensure online measurement of HP rotor expansion value. HMI Upgradation PO- 4370003303 placed on BHEL on 31.03.2024.Material received. Capex scheme – DCS HMI software & Hardware upgradation to latest versions. CMC not in service C&I-III:- Material available. To take benefits in ROE (1%)

13. OVERHAUL PREPAREDNESS INDEX FOR UNIT-8 PROPOSED Short SD FY 2024-25 SECTION % of availability % of availability MATERIAL Work Contract  BM-III 100.0% 96.9% AHP-III 100.0% 94.0% TM-III 83.8% 95.6% EM-III 100.0% 90.9% TEST-III 92.1% 100.0% C&I-III 97.9% 94.8% TOTAL  PREPAREDNESS  95.6% 95.4% Total Prepardness Index of Unit-8 95.5%

14. UNIT- 9 MAJOR WORKS Sr.No .​ Section​ Major Works​ Material/  Work Contract  Availability​ Benefits​ 1​ BM-III ​ Boiler Tubes - Routine Works - Replacement of eroded tubes in first pass water wall & Furnace ​ Material available/ Work PR 1100144547 is  PO Dispatch. To avoid BTL  ​ To improve availability  of unit ​ To improve heat rate ​ Replacement of Coal compartment assembly  ​ Material available/ Work PR 1100143514 in process at  Eligibility stage  To reduce unburnt ​ Heat rate improvement ​ Coal mill performance improvement ​ Air Pre-Heater Servicing (Cold end basket replacement and replacement of seal )  Cold end basket PO 4500130996 placed on M/s BHEL. Work PR 1100144179 at Draft PO stage  Seal- material available Reduce Dry flue gas losses thereby improvement in Heat rate 2 TM-III ​ TG Spares/ Modules- COH - Routine Works Overhaul of  HPT  IPT overhaul , LPT Overhaul and placement of  new LPT rotor  Work of Go verning system & Barring Jam, TDBFP, Condenser Cleaning ​ Material  partially available, PR  at eligibility for remaining material/ TG OH Work PR 1100148842 - PO  despatch LPT rotor available To reduce auxiliary power consumption  ​ To improve vacuum  ​ To improve heat rate ​

15. OVERHAUL PREPAREDNESS INDEX FOR UNIT-9 PROPOSED COH  FY 2024-25 SECTION % of availability % of availability MATERIAL Work Contract  BM-III 94.9% 99.1% AHP-III 96.1% 100.0% TM-III 94.8% 100.0% EM-III 98.5% 97.1% TEST-III 99.0% 98.7% C&I-III 97.6% 100.0% TOTAL  PREPAREDNESS  96.8% 99.2% Total Prepardness Index of Unit-9 98.0%

16. Thank You Budget requirement ​