u#2 oh report 2003
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Unit # 2 Overhauling Report
1.0 INTRODUCTION
Unit # II was shut down at 13:27 hrs on 03/03/2003 for Unit # 2
overhaul for 36 days upto 08/03/2003. The Recommissioning activities
were coordinated from the operation Deptt. by the following
Recommissioning team, under the direct supervision of Sri T. K.
Chaudhuri, Sr. Supdt. (Oprn) and overall guidance of Sri G. Vijayakumar,
DGM (O&C) & Sri D. Sarkar, DGM (O-I).
The Recommissioning Team :
01. Sh. A. Mukherjee, Supdt. (O), Team Leader
02. Sh. P. R. Jena, Supdt. (O)
03. Sh. A. K. Paswan, Dy.Supdt. (O)
04. Sh. R. N. Behera, Sr. Engr. (O)
05. Sh. Rahul Kashyap, Engr. (O)
06. Sh. S. R. Sahana, Controller (O)
07. Sh. R. R. Nayak, Controller (O)
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Unit # 2 Overhauling Report
The following are the broad activities, coordinated/carried out by the
Recommissioning Team.
Issue of PTWs on various equipments/auxiliaries/systems after safe
isolation of the same.
Isolation of various HT/LT switchgears.
Inspection of various areas of Boiler & Turbine and generating detailed
defect reports.
Carrying out different tests in coordination with Maintenance deptt.
Waling as a link between the activities of different maintenance units
during overhauling process.
Monitoring & following up of daily progress of overhauling activities
with Maintenance departments for timely completion of overhauling
activities.
Normalization of equipments after cancellation of PTWs and proper
clearance from the concerned departments.
No load/load trial run of equipments are taken.
Checking of Protection & Interlocks for unit & unit Auxiliaries.
Synchronisation of the unit after safety valve floating & electrical
testing.
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Unit # 2 Overhauling Report
2.0 MAJOR JOBS TAKEN UP DURING THE OVERHAUL :
TURBINE SIDE
Condenser HP jet cleaning.
Condenser water box cleaning & Inspection of both Inlet Butterfly
valves.
D/A cleaning/Inspection/ and Repair work.
TDBFP A/B exhaust valve, Gear Box Inspection & Repair.
TDBFP A/B Mechanical seal Inspection & Repair.
CEP # A Motor Replacement.
Recommissioning of various MOVs/POVs.
Overhaul of various HT/LT Swgrs.
Generation Aux. panel maintenance.
GT R/Y/B & UT – A/B PM jobs.
GCB Testing.
P&I Checks.
Gen./Turbine.
BFP A/B/C, CEP-A / B / C, DMCW Pump – A/B/C
HP bypass valves & OSU.
EHC characteristic checks of HP/IP control valves.
EHC characteristic checks of CVs of TDBFP # A & B.
EHC characteristic of LPBP u/s.
HPH 5A/5B / 6A/6B panting plane leakages attended.
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Unit # 2 Overhauling Report
BOILER SIDE
HFO/LDO passing checking was done through corner valves.
APH water washing.
A/B/C/D/E Mills overhauling.
Furnace internal water washing.
ESP transformer boards annual maintenance work done.
Alll ESP passes annual maintenance work done.
All APHs seal Inspection of defective basket replacement.
All LRSBs / servicing done.
Flue gas duct Inspection from APH to ESP & ID fan to Chimney done.
OFFSITES :
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Unit # 2 Overhauling Report
3.0 ISOLATION & ISSUE OF PTWS
All PTWs as per PTW plan and utmost care was taken to ensure human & equipment safety through locking of Breakers/Modules use of lock out boxes for all HT equipments and next of the LT equipments. It was ensured that Mechanical Isolations are proper and fault free.
Separate PTW Books for each Maintenance deptt.
(BMD/EMD/TMD/C&I etc.) were used.
PTW Registers were used area wise (i.e. Boiler/ Turbine/Generator/ Elecrical systems) and entries in the registers were made equipment wise. Separate SFTs were also issued in trial operation against pending PTW cases.
The total no. of PTWs issued during the overhaul are as mentioned
below.
Department No. of PTWs Issued
BMD
EMD
TMD
C&I
4.0 OVERHAUL OF HT/LT SWGRS :
Overhauling of 40 HT/LT swgrs, 12 HT/LT Xfors, 8 HT Motors, 40 LT motors were taken up. This invoked amount of planning & coordination an the part of Recommissioning team.
Load trial run of D4 set – 2 for 5 hr & DG set # 3 for 2 hrs was done to facilitate overhaul of USS # 4 & EMCC tie Breaker respectively. DG set was loaded upto 255 amps / 410 volts.
Hot changeover of EMCC supply was successfully camed out through synchronisation.
5.0 PROTECTION & INTERLOCK CHECKING
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Unit # 2 Overhauling Report
Details checks of various protection & interlocks camed out for Boiler, Turbine and generator. Also P&Is camed out for fly ash handling system and CW system. As per as possible checks were been carried out in actual conditions rather than simulations. The details of P&I checks and protocols are closed in Annexure.
6.0 CHANCE FOR LOAD/NO LOAD TRIAL RUN OF EQUIPMENTS/ NORMALISATION OF SYSTEM :-
This time printed formats of unit Recommissioning procedures have been followed extensively. All the clearances for various drives and of various departments have been brought under same annexure which helped while load/No load trial run and final clearances were given. Even all the vibration readings of equipments recommissioned have been put under identical formats which have been made in a book structure for further safe keeping.
7.0 INSPECTIONS
Extensive Inspection carried out before repair work of various parts of Boiler and Turbine auxiliaries. Flue ducts, exhaust valves, Dead Bus checking were carried out and problems identified. After problem attending again extensive inspections made to check that the defects have been fully liquidated. Jail's protocols have been signed and enclosed in the annexures.
TURBINE SIDE
TDBFP A/B exhaust butterfly valves seals inspection.
Hot well inspection.
FST / Deaerator inspection.
Under CW in/out water box inspection before and after tube cleaning. Lot of dirt / foreign material/ ball found.
AA – AN valves checked for passing. No passing observed during Boiler hydrotest.
CW in/out butterfly valves internal inspection. Valves checked for full closure/passing & found OK.
PAH separator checked and found OK.
Visual Inspection of last stage blades of LP turbine. No damage / abnormality observed.
BOILER SIDE
Inspection of flue gas ducts for Boiler to ID fan discharge including chimney inlet duct, heavy of duct and puncture of several places observed. Attended.
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Unit # 2 Overhauling Report
Inspection of SADC system before overhauling and after attending the defects. Mismatch between load/Remote pressure feed backs observed and attended. Also SADCs which were damaged were attended.
Inspection of Burners of all corners carried out. Burners at various places were damaged and were replaced.
Burner tilt Mechanism checked from local and remote and play adjusted.
Inspection of all ESP hoppers/boiler hoppers for cleanliness.
Inspection of Boiler Ash hopper internals. May places refractories was seen damaged. Refractories of both hoppers were changed.
All Mill purge and dampes/CADS/were checked. Clarifier Inspections were done. Through MillPA ducts and Bypass ducts were inspected and problems of and welding failure identified and defects got attended.
Mill CO2 & fire fighting system checked.
Mill # D lub oil tank inspection was carried out. Total oil of Tank was changed. Fresh oil was put in the Tank. This was done as before O/H. Mill # D lub oil filters were frequently getting choked.
Inspection of ECW Bypass dampers done. Damper full close checked, for both left/right sides.
Dry run of LRSBs & WBs done and checked with both BMD/EMD.
8.0 RECOMMISSIONING OF MOVS /MODS/POVS/PODS :
The following is the list of MOVs / MODs / POVs /PODs
recommissioned during the overhaul
BOILER SIDE
DESCRIPTION VALVE NO. DESCRIPTION VALVE NO.SB Stm Main MOV UV 001 A ECO Vent UV 603 A/BSB MOV Bypass UV 001B ECO Vent UV 604 A/B
HTSH Spray MOV UV 114 B ESP O/L Gates UV 8016 A/B/C/D
HTSH Spray MOV UV 115 B ESP O/L Gates UV 8026 A/B/C/D
HTSH Spray MOV UV 119 B ESP I/L Gates UV 8015 C/DHTSH Spray MOV UV 115 A ECO Bypass UV 8011 A/BITSH Spray MOV UV 115 E ECO Bypass UV 8011 A/BITSH Spray MOV UV 118 E ECO Bypass UV 802 1A/BMS Stop valve (L) UV 102 B SAPH – B FG I/L UV 8013
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Unit # 2 Overhauling Report
Bypass valve- 1MS stop valve (L)Bypass valve – 2
UV 102 C SAPH – A FG I/L UV 8023
IBV (RHS MSV) UV 101 B PAPH – A Air O/L UV 7625IBV (RHS MSV) UV 101 C PAPH – B Air O/L UV 7615
HRH Vent valve - 1
UV 201 A PA Fan – B disch. damper
UV 7613
HRH Vent valve – 2
UV 201 B PA fan – A disch. damper
UV 7623
Drain bef. ITSH UV 1001 A FD Fan –B disch damper
UV 7713
Drain bef. ITSH UV 1001 B FD Fan – B disch. damper
UV 7713
Drain bef. ITSH UV 1001 B FD Fan – A disch. damper
UV 7723
Drain bef. MSV (R) UV 1003 A MS ERV WSE – 12/13Drain bef. MSV (L) UV 1004 A MS ERV WSE – 14/15
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Unit # 2 Overhauling Report
TURBINE SIDE
DESCRIPTION VALVE NO. DESCRIPTION VALVE NO. MS drains MS – 15/16 LPBP drain valve MAN 12AA 212MS drains MS – 18/19 LPBP drain valve MAN 11AA 211MS drains MS – 20/21 HP bypass drain HPBP – 13/14Combined drain after stop valve bef. control valve
MAL 11 AA 211 HP bypass drain HPBP – 17/19
MS hdr drain before strainer
LBA 20 AA 211 HP seat drain MV 104 A
CRH to D/A drain before control valve
LBG 10 AA 211 HPH – 5A alt drip isolation valve
HDH – 14
Drain bef. Gland seal stm blk valve
LBG 10 AA 213 HRH hdr main drain valve
HR-13
Combined main drain bef. CRH isolation valve
LBR 20 AA 211 Aux. Steam to D/A PCV Bypass valve
ASL – 24
TDBFP – 1A Aux. Steam isolation valve.
ASL - 31
9.0 Modifications carried out
TG Side
Low load control valve cage replaced.
Control fluid and also discharge the hangers put to arrest vibration.
Boiler Side
Purification of filter c/o handle of HCOP filter of ID fan both A/B so that filter can be charged over smoothly.
Extension of SAPH # A/B several tube to ensure full steam coverage of the baskets.
10.0 Tests carried out
Sl. No.
Description Date Remarks
1. Main Turbine over speed test 03/03/2003Elec. O/S : Mech. O/S :
2. TDBFP # A actual over speed 06/03/2003 Elec. O/S : Page 9 of 59
Unit # 2 Overhauling Report
test Mech. O/S :
3.TDBFP # B actual over speed test
06/03/2003Elec. O/S : Mech. O/S :
4. Condenser flood test 08/03/2003Hot well filled upto 6.5 Mt. Elevation
5. Load run of DG set 2 6. Load run of DG set 2
7.Boiler hydraulic test (Internal – 1)
31/03/2003Pressurised upto 216 ksc
8.Boiler hydraulic test (Internal)
02/04/2003Pressurised upto 215 ksc
9.Boiler hydraulic test (Internal 2)
06/04/2003Pressurised upto 140 ksc
10.Boiler hydraulic test (Internal 3)
06/04/2003Pressurised upto 35 ksc
11.Boiler pressurisation Air leak test
07/04/2003
ID fan # A / FD Fan # A kept i/s. Furnace pressurised upto + 45 mm wc.
12.ATT for main turbine safety devices
07/04/2003All devices and checked
13. Gen Electrical Testing 07/04/2003Tests conducted at 3000 rpm.
14. Boiler safety valve floating 07/04/20033 RH safety valves & 8 MS safety valves.
15. TDBFP # A oil injection test 07/04/2003
16. TDBFP # B oil injection test. 07/04/2003
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Unit # 2 Overhauling Report
11.0 SEQUENCE OF ACTIVITIES
03/03/2003 Unit S/D taken for Annual O/H and at 13:27 Hrs unit was desynchronized.
Turbine Actual over speed test done (Both chanels checked)
HFO/LDO passing of corner valves checked. APHs water washing started
04/03/2003 Turbine side HPCVs EHC characteristics checking started.
ABCDE mills PTWs issued to BMD for O/H. Station service swgr Sec. # A & B O/H being done by
EHD. Boiler external water washing started. DMCW/CLCW C/O from Unit # 2 to Unit # 1 for Air
compressors. TMD is decoupling the turbine for speed test. Furnace internal water washing started. All APHs water washing completed. APHs drying started.
05/03/2003 SB PTW issued to EMD. Coal Mill MCC Sec. # A & B PTW issued to
EMD/cancelled/normalised. ESP Xformer & Boards PTWs issued to EMD after hand
tripping. Boiler Internal / External water washing completed. HP/IP EHC characteristic checks completed. LPBP CV EHC characteristic check is in progress. Both ID # A/B Turbine decoupled by TMD for over
speed test. SSS Sec. # A/B O/H completed. Sections normalised. PTW issued on CLCW P/P # 2A for pump inspection. Start up to SB I/C charged. PTW on MDBFP # C for suction strainer replacement &
Booster pump coupling inspection. EHC characteristics of LPBP completed. Control fluid pump discharge header hoppers being
reinforced by TMD. O/H of valves MS-15, 17, 18, 19, 20 HR-13, HPBP 13,
14, 17, 19. APHs drying coupled. APHs PTW issued.
06/03/2003 TDBFP # A/B overspeed test carried out. D/A over flowed and hi & hi hi switches checked. Boiler MCC/Boiler ACDB Annual O/H done. SADC jointly checked with C&I / BMD.
07/03/2003 USS section # B PTW issued. UB Bus PTW issued.
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Unit # 2 Overhauling Report
SAPH A/B, PAPH A/B APH Baskets removed. Scaffolding of Boiler is in progress. CEP # A PTW issued (Both TMD/EMD). Mill A/B/C Main PA/Bypass PA duct inspection
completed. Condenser water box draining started. All APHs GB maintenance work is in progress. PTW issued to TMD on TD # A/B for Inspection/Repair. USS Xfor # B PTW cancelled. PTW on CRH to APRDs main iso. valve and Bypass iso.
valve for valve servicing. 08/03/2003 H2 purging out with CO2 started. (22 cylinders CO2
consumed) Then CO2 purge at with air started. Condenser flood test carried out. 2 UB Bus PTW, cancelled. Normalised. USS Sec # B charged. Flue gas duct APH to ESP Internal Inspection done.
09/03/2003 Hotwell draining started. Hi Hi and hi alarm resetting checked with C&I. PTW issued to TMD for CEP # 2A after P/cable
disconnection. PTW issued to CLCW # 2B for strainer cleaning / NRV
servicing. PTW issued to CEP # 2B for strainer cleaning.
10/03/2003 Chemistry sample of O2 in CO2 taken. CO2 purge at continuing.
BDDC W/PTW. EMCC PTW issued. PTW issued on + 24 V charger # 2 for Annual
maintenance. PTW issued ID Fan # 2A for Motor PM works. Hot well is drained condition. PTW issued on HPH # 5A/5B/6A/6B for attending
panting plane leakages. DMCW # 2B pump decoupled done & NRV being
serviced. Station water level Xmitter cleaning done. Both Risers of CT # 2A/2B opened at CT end and Duct
draining started. Turbine Barring stopped. EMCC PTW cancelled charged. Seal oil system shopped.
11/03/2003 Duct draining is in progress. DNCW Pump # A motor no load trial run taken
vibration readings OK. PTW issued a TVDC & TMCC. PTW a TMCC cancelled, Stator water pump alignment being done by TMD.
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Unit # 2 Overhauling Report
TDBFP # A/B work being done by TMD. 12/03/2003 2UA PTW issued.
Duct draining is in progress. DCSV distribution Board PTW issued. ESP # A pss water washing done. FAHP # 2A no load trial run completed. Mill # A/B PTW issued to EMD a main motor. Duct drained.
13/03/2003 PTW issued a USSS Sec. # A and B/C also. 2UA PTW is pending. Mill classifier inspection done. CW I/L & O/L butterfly valve operation checked. Secondly air duct inspection done. CLCW # 2A/2C – Alignment is in progress. DMCW # 2A/2B – Alignment completed. 2A D/couple
trial run taken. TG Brg. # 6 – Oil leakage attended. LBF # 30 – Jet cage replacement is in progress.
14/03/2003 2 UA PTW cancelled. 2UA Bus charged. 2 UAA 3.3 KV section # A (AC section) O/H done.
Charged. 20 AA 3.3 KV section # B (BC section) PTW issued. Section ACDB PTW cancelled. Normalised. CT Xfor # A DM Xfor # B / FOPH Xfor # B PTW
cancelled. C&I drained. Stator water tank make up taken. Mill #2A / SAP # B no load trial run taken. Water box cleaning by HP Jet started. PRAPH A/B FG I/L duct inspected. SRAPH A/B FG I/L duct inspected. MDBFP # C Rapid start up device commissioned.
Jointly cleaned with C&I.15/03/2003 ESP Pass # A checking done.
2UA all down stream Xfors except CT 2A, UST # A, USB # A are charged.
UAA Sec # B PTW pending. CST inspection done.
16/03/2003 TD # 2A charged from water side for alignment work by TMD.
Stator water flow to alarm checked. TDBFP # 2A FW line charged & Booster pump filled up.
17/03/2003 ANB oil pump pressure setting is being done. AA/AN oil pump pressure setting is being done. DMW Pump # 2B D/couple no load motor trial run
taken. PTW issued for Turbine area CVs for cleaning &
calibration to C&I. 2UA & 2UB Bus charged from 5A & 5B respectively
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Unit # 2 Overhauling Report
through start up and UT # 2A/2B incomer was made off & Breaker racked out.
PTW issued to EMD on Annual O/H of GT # 2 & UT # 2A/2B.
PTW issued an excitation system for O/H. CW water box (RHS) jet cleaning is in progress. ESP A pass rapping motors RW and Internal Inspection
done with BMD/EMD. 18/03/2003 Hot well Inspection done.
MDBFP # C Interlocks & Protections checking completed.
PTW issued on UPS to C&I. Tube cleaning (LHS) is in progress. D/A to condenser control valve is having passing. TMD
is attending. ANB & HPBP oil pumps protections & interlocks
checked. Both SAPH Basket cleaning going on. Sector plates
being checked. Both PAPH sector plates checked. Mills O/L duct checked. Both Bypass & through Mill. DMCW Pump # B coupling done after no load trial run. CEP # 2A/2B/2C strainers cleaned by TMD. CT 2A/2B both Basins inspected. PTW issued to TMD on AOP 1 & 2, CEP 1 & 2.
20/03/2003 Mill # A & E lub oil system Protections & Interlocks checked.
DMCW Pump # A & B Protections & Interlocks checked. DMCW Pump # C No load trial run taken. DMCW Pump # A & B load trial run taken. TDBFP # A exhaust valve checked. A/C MCC PTW issued. A/C MCC PTW cancelled. PTW issued to TMD for valve modification of condenser
water line & chiller water line. 21/03/2003 TDBFP # B exhaust valve checking done.
CST 2B filled up. All equalising valves lined up. Normalised.
TACDB PTW issued. Fly ash MCC section # A PTW issued to TMD. TP # 5 BC not closing problem attended by EMD. A/C valve modification done. PTW cancelled. FD Fan # A/B, PA Fan A/B P&I checks done. Load trial run of DMCW pump 2A/2B taken. Vibration
readings taken. Hot well filling started. Lo Lo & Lo alarm reset values noted. Mill # D lub oil P&I checked. Generator relays checked by EMD jointly with
Page 14 of 59
Unit # 2 Overhauling Report
commissioning. Control fluid pump no load trial run taken. 3.3 KV fly ash sec # A PTW cancelled. Charged.
22/03/2003 CEP # B/C P&I checked. PTW issued on CEP B&C for electrical lug replacement. Stator water Regeneration unit Resin Replacement
done by TMD and kept under flushing for 8 hrs. PTW issued on Ex 5-19, HAL 11 AA 213,LBR 10AA 212,
LBC 11AA 211, CO-86 for valve servicing. Gen. Aux. panel PTW issued. Cancelled. Normalised. Mill # A & E feeders trial run taken for 8 hrs. Then
stopped. 23/03/2003 Mill # B lub oil P&I checks completed.
FD Fan A/B, PA fan A/B, CEP # 2C, Mill # 2C PTW issued to EMD.
US section # A I/C Breaker not closing problem attended by EMD.
ESP # B Internal Inspection done with BMD.
24/03/2003 PTW issued an Air ventilation MCC to EMD. Cancelled. Normalised.
PTW issued an TP # 8 to EMD. PTW issued a Ash Extraction Xfmer # A & B to EMD. TG AOP # 1 & 2 No trial run taken. Mill # 2A No load trial run taken. TDBFP # A oil system taken i/s. PTW issued on Boiler ACDB Sec # A to EMD for MCC
O/H. Cancelled. Normalised. USS Sec # A charged. Section kept individually
charged. ID Fan # A & B P&I checks done. Both condenser passes tube cleaning completed. ESP # C pass Internal Inspection jointly done with
BMD. SRAPH A/B FG I/L dampers operation charged. Corner # 2 clearance given by BMD for putting
Ignitors/Scanners.25/03/2003 TP # 8 under PTW. PTW cancelled. Normalised.
Mill # 2B no load motor trial run taken. CEP # 2A No load motor trial run taken. DMCW # A Decoupled to check vibration problem. Low load control valve being checked by TMD. Mills B/C/D feeder O/L gates actuators replaced. Values UV 1001A, B, 1002 A,B 1003 A, B 1004 A, B
actuators serviced. CW O/L scanners of LHS/RHS done. Joint Inspection
also done. Joint checking of CW duct & CW I/L butterfly valve
done.
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Unit # 2 Overhauling Report
FST drained. Joint checked of DA & FST done. All vac. Pumps & FAHP # 2B motor PTW issued for
EMD. MS & RH ERVs checked after BMD clearance.
26/03/2003 Mill # 2C lub oil P&I checks done. Corner # 2 Ignitor/Scanners checked. Mill # 2A/2B Mill Motor coupling done. ESP # D pass Inspection done. FST # D pass Inspection done. Air I/l PRAPH/SRAPH / dampers checked. Operation. Air O/L PRAPH.
27/03/2003 CW duct filling started. DMCW Pump A & B load trial run taken. Mill # A / SAF # B no load trial run taken. Air O/L dampers of all APHs operated at local. D/A, FST repair work in progress. PTW issued a BVDC. Cancelled. Normalised.
28/03/2003 CW Duct filling in progress. DMCW pump # C taken i/s after coupling. DMCW pump # B taken i/s. CLCW pump # A & C taken i/s. Boiler side DMCW charged. ESP I/L & O/L dampers operation checked. All actuators/ valves who permit cancelled operation
checked. FST filled up after repair.
29/03/2003 AOP # 1 & AOP # 2 load run taken. Mill # 2D no load trial run taken. Mill # 2E P&I checks completed. LP Turbine last stage slade Inspection done. TDBFP # A P&I checks completed. CEP # A clearance given for running. CEP # B & C run.
30/03/2003 Mill # A P&I checks completed. Corner 1 & 4 scanners & Ignitors checked. CEP # A taken i/s. MDBFP # C started in R/C for Trial run.
31/03/2003 Boiler filling & flushing done (c lines). Boiler hydrotest (Internal) done at 216 ksc. PAPH # 2A & SAPH # 2A SB & GB lub oil system
clearance given. Lub oil pumps taken i/s. Joint Inspection of APH to ESP and ID to cleaning duct
done. WBs and LRSB trial operation cleaning by BMD/EMD.
01/04/2003 MFT I/l protection checked. Mill # C protection checked. PAPH # A & SAPH # B trial run started. PA fan # A Motor trial run taken. All DC oil pumps vibration & speed Measurement done
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Unit # 2 Overhauling Report
by MTP. Main Turbine I/L protection checked. PTW on AOP # 1 issued to EMD. PA Fan # A/B, FD Fan A/B discharge damper
open/close cleared by local.02/04/2003 SAPH A & B / PAPH A&B Internal Inspection done.
P&I of fail safe protections checked. Aux. TG checked. Found OK. AOP # 1 taken i/s. LPBP protections completed. CO # 86 limit switch adjustment done by EMD. JOP 3.3 high vibration problem attended. Boiler hydrotest (External) for Boiler Regulating
Authenties permit raised upto 215 ksc. 03/04/2003 Cold end soot blowers operated with BMD.
TDBFP # B oil system taken i/s. TDBFP # B water charging done. TDBFP # B P&I checks completed. Fly ash system (P&I) checks done. Mill CO2 system checked for all mills with C&I/BMD. Turbine put a barring. AN value seat adjustment done.
04/04/2003 Generator mechanical P&I checks done. Generator electrical P&I checks done. TDBFP # B P&I checks completed. Corner # 3 scanners/ignitors checked. AA/AN/ANB valve operation checked. Speed switches put an all APHs by C&I. TD # B put on BG. Control fluid pump # 2A load trial run taken. CLCW pump # 2b / JOP 3.3 taken i/s.
05/04/2003 CW Pump # 5 started. PTW on excitation system cancelled. UT # 2A/2B emulsifier checked. Mill # 2C motor no load trial run taken. AC scanner air for started. Flushing done.
06/04/2003 Boiler Hydrotest – III (Internal) done at 140 ksc. APRDS charged. RH leakage test doe by Vac. Putting. Seal trough filling done. CW Pump # 4 started. H2 filling started. 27 CO2 cylinders consumed. 132 H2 cylinders consumed.
07/04/2003 Boiler lighted up. Air pressuriszation test done. Hot draining done. Safety valve floating done.
Page 17 of 59
Unit # 2 Overhauling Report
ANNEXURES
(I TO V)
Page 18 of 59
Unit # 2 Overhauling Report
UNIT # 2 OVERHAUL
ANNEXURE – I
The following is the list of SWGRs (HT/LT) overhauled during the overhaul.
a) HT SWGR (11 KV) :
Sl. No.
DescriptionDate of Isolation
Date of Normalisatio
n1. 1 UB2. SA
b) HT SWGR (3.3 KV)
Sl. No.
DescriptionDate of Isolation
Date of Normalisatio
n1. 1 UAA (SEC – A)2. 1 UAA (SEC – C)3. 1 UAA (SEC – B)4. FLY ASH MCC(SEC – B)
c) LT SWGR (415 V)
Sl. No.
DescriptionDate of Isolation
Date of Normalisatio
n1. SSS – A2. SSS – B3. USS – A4. USS – B5. TMCC – A6. TMCC – B7. BMCC – A8. BMCC – B9. COAL MILL MCC – A10. COAL MILL MCC - B
Sl. No.
DescriptionDate of Isolation
Date of Normalisatio
n
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Unit # 2 Overhauling Report
11. STATION ACDB – A12. STATION ACDB – B13. TURBINE ACDB – A14. TURBINE ACDB – B15. BOILER ACDB – A16. BOILER ACDB – B 17. ESP BOARD – C SEC – 118. ESP BOARD – C SEC – 219. ESP BOARD – D SEC – 120. ESP BOARD – D SEC – 221. ESP BOARD – A SEC – 122. ESP BOARD – A SEC – 223. ESP BOARD – B SEC – 124. ESP BOARD – B SEC – 225. EMCC26. TVDC27. BVDC28. BDDC29. SOOT BLOWER MCC30. ASH EXTRACTION MCC SEC – A31. ASH EXTRACTION MCC SEC – B32. CT MCC – A33. UCR A/C MCC
d) MISCELLANEOUS :
Sl. No.
DescriptionDate of Isolation
Date of Normalisatio
n1. 220 V CHARGER – 12. 220 V CHARGER - 23. + 24 V ABB CHARGER – 1& 24. UPS BATTERY SET (CAPACITY
TEST)
Sl. No.
DescriptionDate of Isolation
Date of Normalisatio
n5. UPS BATTERY SET
(REPLACEMENT OF BYPASS CELLS)
6. 24 V/48 C/100 V CHARGER –1)7. 24 V / 48 V / 100 V CHARGER –
28. GEN AUX. PANEL 9. CSSAEP 10. MAIN TG DC STARTER PANEL
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Unit # 2 Overhauling Report
e) HT/LT TRANSFORMERS :
Sl. No.
DescriptionDate of Isolation
Date of Normalisatio
n1. GT # 1 (R/Y/B)2. GT # 1 (R/Y/B) MB & Common
Kiosk 3. CW SERV. XMER – A4. ESP XMER – 1A5. FOPH SERV XMER – A6. ASH EXTRACTION MXER – A
(TP – 5)7. ASH EXTRACTION XMER-B
(TP-8)8. UNIT SERVICE XMER – 1B (for
painting)9. UNIT SERVICE XMER – 1A (for
painting)10. STN SERVICE XMER –1B (for
painting)11. STN SERVICE XMER – 1A (for
painting)
Page 21 of 59
Unit # 2 Overhauling Report
UNIT # 2 OVERHAUL
ANNEXURE – II
The following P&I checks were carried out during the overhaul (Details given under Protoclos) A) BOILER & AUXILIARIES :
SL. NO.
DESCRIPTION DURATION
1.
MAIN BOILER P&I Purge permissive MFT Conditions Boiler alarms LDO – HFO System Fail Safe Checking
2. ID FANS – A/B
3. FD FANS – A/B
4. PA FANS – A/B
5. MILL – A LUB OIL SYSTEM
6. MILL – B LUB OIL SYSTEM
7. MILL – C LUB OIL SYSTEM
8. MILL – D LUB OIL SYSTEM
9. MILL – E LUB OIL SYSTEM
10. MILL – A MAIN MOTOR PROTECTIONS
11. MILL – B MAIN MOTOR PROTECTIONS
12. MILL – C MAIN MOTOR PROTECTIONS
13. MILL – D MAIN MOTOR PROTECTIONS
14. MILL – E MAIN MOTOR PROTECTIONS
15. OSU OF AA – AN V/Vs
16. OSU OF ANB V/V
17. BOTTOM ASHING SYSTEM
18. FLY ASHING SYSTEM
B) TG & AUXILIARIES :
SL. NO.
DESCRIPTION DURATION
1. MAIN TURBINE PROTECTIONs
2. SGC LUB OIL SYSTEM
3. SGC TURNING GEAR
4. SGC HYDRAULIC FLUID SYSTEM
5. SGC SEAL OIL SYSTEM
Page 22 of 59
Unit # 2 Overhauling Report
6. SGC STATOR WATER SYSTEM
7. OSU HPBP SYSTEM
8. HPBP V/Vs & SPRAY V/Vs
9. DMCW PUMP - A/B
10. DMCW PUMP – C
11. CEP – A
12. CEP – B/C
13. DMBFP
14. TDBFP – A
15. TDBFP - B
C) ELECTRICAL SYSTEM :
SL. NO.
DESCRIPTION DURATION
1. MAIN GENERATOR PROTECTIONS
2. GCB AUXILIARIES
3. GCB INTERLOCKS
Page 23 of 59
Unit # 2 Overhauling Report
UNIT # 2 OVERHAUL
ANNEXURE – III
BOILER # II SAFETY VALVE SETTINGBY HYDRAULIC PRESS METHOD
Sl. No. Safety Valve No.
Design Press (ksc)
Actual Available
Press (ksc)
Hydroset Oil Press
(ksc)
Actual Lifting
press (ksc)1. WSE 001 215.0 131.5 67 215.0
2. WSE 002 217.0 134.0 67 216.0
3. WSE 003 214.0 135.5 54 214.0
4. WSE 004 212.5 135.0 54 214.0
5. WSE 005 215.5 140.0 60 213.4
6. WSE 006 217.0 140.0 64 218.0
7. WSE 007 201.5 124.0 62 200.5
8. WSE 008 201.5 122.0 65 201.5
Operation BMD Date of TestSignature :Name :Designation
Page 24 of 59
Unit # 2 Overhauling Report
The following dampers have been operated at local on
26/03/2003.
SRAPH # A FG I/L damper - Operated OK.
SRAPH # B FG I/l damper - Operated OK.
PRAPH Air I/L damper - Operated OK.
SRAPH # A Air I/L damper - Operated OK.
PRAPH # B Air I/L damper - Operated OK.
SRAPH # B Air I/L damper - Operated OK.
PRAPH # A Air O/L damper UV 7625 - Not taking command.Total not closing.
SRAPH # A Air O/L damper UV 7725B - Not taking commandUV 7725 C 70 % doing, then mechanical
jamming.
SRAPH # B Air O/L damper UV 7715B - Not taking commandUV 7715 C 60 % closing, jamming.
PRAPH # b Air O/L damper UV 7615 - Closing but remaining around 5 %
Open.SRAPH # A/B FG I/L dampers bottom seal in damaged condition and flap to flap seal not present.
Checked By Sign. :Name : Desig. :Deptt. : Operation
Checked By Sign. :Name : Desig. :Deptt. : B M D
Page 25 of 59
Unit # 2 Overhauling Report
RECORD OF FST/DEAERATOR CHECKING
Checked on 25/03/2003 along with TMD personnel.
FST PROBLEMS
TDBFP # A suction inlet net in FST has hot displaced.
TDBFP # B suction inlet net and parting plate has got displaced.
Parting plate has to be rewelded.
MDBFP # C parting plate of suction line welding is in cracked condition.
Parting plate has to be rewelded.
DEAERATOR PROBLEMS
01 no. of nozzle bolt is in loose condition.
Aerator plates has got displaced from it's original position.
Checked By Sign. :Name : Desig. :Deptt. : Operation
Checked By Sign. :Name : Desig. :Deptt. : T M D
Page 26 of 59
Unit # 2 Overhauling Report
INSPECTION REPORT OF 'C' PASS OF ESP
Following numbers of plates were not having adequate distance
between emitting and collecting plate.
01. 1C2 - 03 Nos.
02. 2C2 - 04 Nos.
03. 3C2 - 02 Nos.
04. 3C1 - 01 No.
05. 4C2 - 02 Nos.
06. 5C2 - 03 Nos.
07. 5 CL - 02 Nos.
08. 6C2 - 02 Nos.
09. 7C2 - 01 No.
The following number of plates were not having free movement.
01. 2C2 - 01 Plate
02. 5C1 - 01 Plate
03. 7C1 - 01 Place
The above problems were shown to AHD.
Checked By Sign. :Name : Desig. :Deptt. : Operation
Checked By Sign. :Name : Desig. :Deptt. : A H D
RECORD OF CHECKING OF CW DUCT (BOTH LHS/RHS)
LHS CW duct inlet inspected on 25/03/2003.
Mud, Leaves, Taprogee balls, Wooden blocks found in the CW duct inlet
portion.
Page 27 of 59
Unit # 2 Overhauling Report
CW I/L butterfly valve LHS operation checked. Opened & closed.
Found OK.
RHS CW duct inlet inspected on 26/03/2003.
Mud, leaves, taprogge balls, Wooden blocks found in the CW duct inlet
portion.
CW I/l butterfly valve RHS operation checked. Opened & closed. Found
OK.
I/L Butterfly valve seal is damaged in four nos. places.
Checked By Sign. :Name : Desig. :Deptt. : Operation
Checked By Sign. :Name : Desig. :Deptt. : T M D
Page 28 of 59
Unit # 2 Overhauling Report
INSPECTION REPORT OF 'D' PASS OF ESP
Following plates (nos.) were found to have inadequate distance
between them.
01. 2D1 - 02 Nos.
02. 2D2 - 02 Nos.
03. 6D1 - 03 Nos.
04. 6D2 - 03 Nos.
05. 7D1 - 07 Nos.
06. 7D2 - 01 Nos.
07. 5D1 - 03 Nos.
08. 5D2 - 03 Nos.
09. 3D2 - 10 Nos.
10. 3D2 - 04 Nos.
02 plates in pass 1D1 were found to have loose clamps.
01 plate in pass 3D1 was not having free movement.
In following passes hammers were found to strike the flame before
hitting the shock pad.
01. 1D1 - 01 hammer
02. 1D2 - 01 hammer
03. 5D1 - 01 hammer
04. 6D1 - 01 hammer
Checked By Sign. :Name : Desig. :Deptt. : Operation
Checked By Sign. :Name : Desig. :Deptt. : A H D
Page 29 of 59
Unit # 2 Overhauling Report
INSPECTION REPORT OF 'B' PASS ESP
Following numbers of plates were found to have more gap as compared
to allowable limit.
01. Pass no. – 2B1 - 01 plate
02. Pass no. – 3B1 (NDE) - 01 plate
03. Pass no. – 4B2 - 01 plate
04. Pass no. 5B1 - 03 plates (problems was attended)
05. Pass no. – 7B2 - 02 plates
Pass no. 4B1 – 02 plates were not having free movement. '
Pass no. 1B1 – 01 plate was not having free movement.
Above problems were shown to A.H.D.
Checked By Sign. :Name : Desig. :Deptt. : Operation
Checked By Sign. :Name : Desig. :Deptt. : A H D
Page 30 of 59
Unit # 2 Overhauling Report
DEFECTS / PENDING
Corner – 1
Level – 2 Oil both flaps in Operative (K) (BMD work line to be put).
Corner – 3
Level – 2 oil damper lower flap not operating (K) (BMD work) Line to be
put.
Level – 2 lower aux. air damper not operating fully (J) (80 % open)
Corner – 4
Level – 1 oil damper mech. – Jamming (N)
Level – 2 oil damper lower flap inoperative (K)
Checked By Sign. :Name : Desig. :Deptt. : Operation
Checked By Sign. :Name : Desig. :Deptt. : B M D
Page 31 of 59
Unit # 2 Overhauling Report
TDBFP # A EXHAUST VALVE INSPECTION DATE: 20/03/2003
Seat of the valve was slightly roughed up.
Water present inside the duct.
Valve was closed manually and valve seat checked.
TDBFP # B EXHAUST VALVE INSPECTION DATE: 21/03/2003
Valve seal damaged in 02 nos. places.
Water present inside the duct.
Valve was closed manually and valve seat checked.
Checked By Sign. :Name : Desig. :Deptt. : Operation
Checked By Sign. :Name : Desig. :Deptt. : T M D
Page 32 of 59
Unit # 2 Overhauling Report
PROBLEMS IDENTIFIED DURING INSPECTION OF ESP – A PASS
Date : 15/03/2003
A) Problems found during inspection of gap between emitting
and collecting electrodes.
The gap between electrodes were either more or less and this was
shown to BMD.
Pass 1A1 – 03 Nos.
Pass 4A2 – 10 Nos.
Pass 5A2 - 04 Nos.
Pass 3A2 - 04 Nos.
Pass 6A2 - 05 Nos.
Rapping motor shaft at some places were also eroded and same
was shown to BMD.
B. Problems identified when rapping motors were taken I/S.
2A2 - One of the hammers of C.E. was striking the beam before
striking the striker plate thereby leading to loss of momentum. This was
shown to BMD.
6A2 - Same of the hammers were offset from their position. This was shown to BMD.
Checked By Sign. :Name : Desig. :Deptt. : Operation
Checked By Sign. :Name : Desig. :Deptt. : A H D
Page 33 of 59
Unit # 2 Overhauling Report
INSPECTION OF C.S.T. – B IN DRAINED CONDITION
Date : 15th March'2003
Checkings done :-
01. Epoxy painting found intact.
02. C.S.T. is fully cleaned and no debris were found.
03. Mechanical float was inoperative. T.M.D. replaced the tape and now is in working condition.
04. TMD was informed for box up.
Checked By Sign. :Name : Desig. :Deptt. : Operation
Checked By Sign. :Name : Desig. :Deptt. : T M D
Page 34 of 59
Unit # 2 Overhauling Report
Checked By Sign. :Name : Desig. :Deptt. : Operation
Checked By Sign. :Name : Desig. :Deptt. : B M D
Page 35 of 59
UNIT # 1 UNIT # 2
CST B
Drain
RecirculationCST A
Drain
U # 1U # 2
U # 1 sideU # 2 side closed
closed
spill
From DM
CT 2 CT 1
Unit # 2 Overhauling Report
INSPECTION OF MILLS A, B, C MAIN PA & BYPASS PA DAMPERS
Main PA/Bypass PA damper seal eroded of Mills ABC.
Main PA welding joint after main PA dampers damaged Mills ABC.
Mill # A DE Bypass duct first expansion joint before bypass PA damper
disturbed.
Mills C/D/E main PA duct welding hole in left side wall.
Mill B / NDe side bypass PA screen to mixing chamber welding
damaged.
Mill # A / DE & NDE side bypass PA screen to mixing chamber welding
damaged.
Mill # B DE side bypass PA duct after damper welding change.
Checked By Sign. :Name : Desig. :Deptt. : Operation
Checked By Sign. :Name : Desig. :Deptt. : B M D
SADC CHECKING Date : 06/03/2003Corner - 2 Corner - 3
LVL-1A
0 - OK O LVL-1 A 0 - OK O50 - OK 50 - OK
100 - OK 100 - OKC 0 - OK C 0 - OK
Page 36 of 59
Unit # 2 Overhauling Report
50 - OK 50 - OK100 - OK 100 - OK
O0 - OK
N O0 – 10 % open
N50 - OK 50 - OK100 - OK 100 - OK
C0 - OK
M
C0 - OK
M
50 - OK 50 - OK100 - OK 100 - OK
A0 - OK
A0 - OK
50 - OK 50 - OK100 - OK 100 - OK
LVL-2A
0 - OK
L
LVL-2
A 0 - OK
L
50 - OK 50 - OK100 - OK 100 - OK
C0 - OK
C0 - OK
50 - OK 50 - OK100 - OK 100 - OK
O0-10% open
K O0 – upper flap lower flap
K50 - OK 50 - OK100 - OK 100 - OK
C0 - OK
J
C0 - OK
J
50 - OK 50 - OK100 - OK 100 - OK
A
0 - OK
A
0 - OK50 - OK 50 - OK
100 - OK 100 – 80 % opening
LVL-3A
0 - OK
I
LVL-3
A0 - OK
I
50 - OK 50 - OK100–80 % opening 100 - OK
C0 - OK
C0 - OK
50 - OK 50 - OK100 - OK 100 - OK
O0 - OK
H O0 - OK
H50 - OK 50 - OK100 - OK 100 - OK
C0 - OK
G
C0 - OK
G
50 - OK 50 - OK100 - OK 100 - OK
A0 - OK
A0 - OK
50 - OK 50 - OK100 - OK 100 - OK
Checked By Sign. :Name : Desig. :Deptt. : Operation
Checked By Sign. :Name : Desig. :Deptt. : B M D
Checked By Sign. :Name : Desig. :Deptt. : C&I
Page 37 of 59
Unit # 2 Overhauling Report
SADC CHECKING Date : 06/03/2003Corner - 2 Corner - 3
LVL-4A
0 - OK
F
LVL-4
A 0 - OK
F
50 - OK 50 - OK100 - OK 100 - OK
C0 - OK
C0 - OK
50 - OK 50 - OK100 - OK 100 - OK
O0 - OK
E O0 – 10 % open
E50 - OK 50 - OK100 - OK 100 - OK
C0 - OK
D
C0 - OK
D
50 - OK 50 - OK100 - OK 100 - OK
A0 - OK
A0 - OK
50 - OK 50 - OK100 - OK 100 - OK
LVL-5A
0 - OK
C
LVL-5
A 0 - OK
C
50 - OK 50 - OK100 - OK 100 - OK
C0 - OK
C0 - OK
50 - OK 50 - OK100 - OK 100 - OK
O0 - OK
B O0 - OK
B50 - OK 50 - OK100 - OK 100 - OK
C0 - OK
A
C0 - OK
A
50 - OK 50 - OK100 - OK 100 - OK
A0 - OK
A0 - OK
50 - OK 50 - OK100 - OK 100 – OK
Checked By Sign. :Name : Desig. :Deptt. : Operation
Checked By Sign. :Name : Desig. :Deptt. : B M D
Checked By Sign. :Name : Desig. :Deptt. : C&I
SADC CHECKINGCorner - 1 Corner - 4
LVL-1A
0 - OK
O
LVL-1 A 0 - OK
O
50 - OK 50 - OK100 - OK 100 - OK
C0 - OK
C0 - OK
50 - OK 50 - OK100 - OK 100 - OK
O 0 - OK N O 0 – OK NMech. Jam.50 - OK 50 - OK
100 - OK 100 - OK
Page 38 of 59
Damper plate eroded
Both damper disconnected
Unit # 2 Overhauling Report
C0 - OK
M
C0 - OK
M
50 - OK 50 - OK100 - OK 100 - OK
A0 - OK
A0 - OK
50 - OK 50 - OK100 - OK 100 - OK
LVL-2A
0 - OK
L
LVL-2
A0 - OK
L
50 - OK 50 - OK100 - OK 100 - OK
C0 - OK
C0 - OK
50 - OK 50 - OK100 - OK 100 - OK
O0- OK upper flap lower flap in
operative
KO
0- OK upper flap lower flap in operative
K50 - OK 50 - OK
100 - OK 100 - OK
C0 - OK
J
C0 - OK Upper
portion slightly
corroded
J
50 - OK 50 - OK100 - OK 100 - OK
A0 - OK
A0 - OK
50 - OK 50 - OK100 - OK 100 - OK
LVL-3A
0 - OK
I
LVL-3
A0 - OK
I
50 - OK 50 - OK100 - OK 100–80 % open
C0 - OK
C0 - OK
50 - OK 50 - OK100 - OK 100 - OK
O0 - OK
H O0 – OK (Mech. Jam)
H50 - OK 50 - OK100 - OK 100 - OK
C0 - OK
G
C0 - OK
G
50 - OK 50 - OK100 - OK 100 - OK
A0 - OK
A0 - OK
50 - OK 50 - OK100 - OK 100 - OK
Checked By Sign. :Name : Desig. :Deptt. : Operation
Checked By Sign. :Name : Desig. :Deptt. : B M D
Checked By Sign. :Name : Desig. :Deptt. : C&I
SADC CHECKINGCorner - 1 Corner - 2
LVL-4A
0 - OK
F
LVL-4
A 0 - OK
F
50 - OK 50 - OK100 - OK 100 - OK
C0 - OK
C0 - OK
50 - OK 50 - OK100 - OK 100 - OK
O0 - OK
E O0 - OK
E50 - OK 50 - OK100 - OK 100 - OK
C0 - OK
D
C0 - OK Mech.
Jamming
D50 - OK 50 - OK
100 - OK 100 - OK
A0 - OK
A0 - OK
50 - OK 50 - OK100 - OK 100 - OK
Page 39 of 59
Unit # 2 Overhauling Report
LVL-5A
0 - OK
C
LVL-5
A 0 - OK
C
50 - OK 50 - OK100 - OK 100 - OK
C0 - OK
C0 - OK
50 - OK 50 - OK100 - OK 100 - OK
O0 - OK Mech.
jamming
BO
0 - OKB50 - OK 50 - OK
100 - OK 100 - OK
C0 - OK
A
C0 – 10 % open
A
50 - OK 50 - OK100 - OK 100 - OK
A0 - OK
A0 – 10 % open
50 - OK 50 - OK100 - OK 100 – OK
Checked By Sign. :Name : Desig. :Deptt. : Operation
Checked By Sign. :Name : Desig. :Deptt. : B M D
Checked By Sign. :Name : Desig. :Deptt. : C&I
Page 40 of 59
Unit # 2 Overhauling Report
HPT EHC 2MAX 26 AU01 (PRE OVERHAULING)
Command
EHC F/bCoil
CurrentOil Pr.
HPT (Left) HPT (Right)Left Hdr.
1 MAA 11 AA 011
Left Vent1 MAA 11 AA 012
Left Hdr. 1 MAA 12 AA
011
Left Vent1 MAA 12 AA 012
0 % 6.54 4.5 105.7 / 0.55 101.7 / 1.85 107.1/-0.3 % 105.4/1 %10 % 7.71 5.8 4.7/21.7 101.7/1.85 107.1/-0.3 % 94.4/22.6 %20 % 8.89 7.3 9.8/32.30 101.7/1.85 107.1/-0.3 % 89.6/32.2 %30 % 10.15 8.9 85.4/41.4 % - - 85.1/40.9 %40 % 11.32 250 mA 10.5 81.3/49.6 % - - 81.3/48.6 %50 % 12.50 12.0 72.2/58.1 % - - 77.1/57.8 %60 % 13.67 13.6 59.7/100 % 92.6 %/19.8 % 107.1/-0.3 % 61.8/87.3 %70 % 14.94 15.20 55.10/100 % 80.90/43.0 % 107.1/-0.3 % 52.90/99.90 %75 % 15.52 16.00 55.10/100 % 74.80/55.13 % 107.1/-0.3 % 52.90/100 %80 % 16.11 16.90 55.10/100 % 65.60/71.73 % 107.1/-0.3 % 52.90/100 %85 % 16.70 17.60 55.10/100 % 48.70/100 % 92.7/32.3 % 52.90/100 %90 % 17.38 18.50 55.10/100 % 48.70/100 % 80.4/58.1 % 52.90/100 %95 % 17.97 19.40 55.10/100 % 48.70/100 % 66.0/91.1 % 52.90/100 %100 % 18.55 20.20 55.10/100 % 48.70/100 % 57.1/100 % 52.90/100 %105 % 19.14 21.00 57.1/100 %
Checked By Sign. :Name : Desig. :Deptt. : Operation
Checked By Sign. :Name : Desig. :Deptt. : C&I
Page 41 of 59
Unit # 2 Overhauling Report
IPT EHC 2MAX 28 AU 004 (PRE OVERHAULING)
Command
EHC F/bCoil
CurrentOil Pr.
IPT (Left) IPT (Right)Stroke CER/Fb Stroke CER/Fb
0 % 8.00 4.7 264.2 0.732 263.9 0.3 %10 % 9.08 6.0 230.5 19.97 230.6 19.92 %20 % 10.15 7.4 225.0 23.15 224.9 23.1930 % 11.33 8.8 219.5 26.4 219.3 26.340 % 12.40 10.2 213.7 29.78 213.7 29.5450 % 13.57 11.7 207.3 32.9 198.1 32.760 % 14.65 13.2 203.0 36.0 202.8 35.970 % 15.82 14.7 197.8 39.0 197.4 39.080 % 16.89 16.2 192.2 42.3 191.4 42.790 % 17.97 17.8 179.8 49.7 179.4 53.995 % 18.55 18.5 124.9 83 108.5 93100 % 19.14 19.3 89.7 99.9 91.2 99.9105 % 19.72 20.1 89.7 91.2
Checked By Sign. :Name : Desig. :Deptt. : Operation
Checked By Sign. :Name : Desig. :Deptt. : C&I
Page 42 of 59
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