Download - Boiler Commissioning Presentation
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BOILERCOMMISSIONING
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COMMISSIONING :It is the later stage of
erection and starting stage of operation.It includes 14 days of continuous
operation with 72 hrs of full load operation.
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Commissioning Activities before taking over aplant.
Purpose
To check that plant is supplied as per design
Quality of erection and commissioning
Plant operates reliably, safety & design
performance. Finding out reason for any failure to achieve the
design performance.
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Organization
Steering committee Policy and priorites.Ensures adequate resource. Approval ofdocuments. Headed by G.M.
Commissioning panel
Control & progress ofday to day activities. Coordination betweenTest teams and Working groups. Erection &O&M dept.
Working groups
Looks after requirement ofTest team.
Test Team Conducting testing &commissioning.
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Documentation
1. Papers of principle Prepared jointly byErection and corporate O.S.
To set out principles & objectives
Established design data to compareplant.
Define documentation requirement
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Documentation
2.Testing & commissioning Schedule
To meet the requirement of the paper ofprinciple
Plant under cover
Detail test method & programme
Safety
Emergencies
Individual responsibility
Results
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Documentation
3.Standard checklist
Ensuring completion of erection
Limited extent operation Test conductance in consistent
manner
Instrument providing Schedule withrange & resolution and calibrationvalidation.
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Documentation
4.Design change notification5. Test reports
Recording of resultOmission reportAnalysis
6. Safety procedure7. Plant certification
Safety clearance certificateRecord of initial operationClearance for station operation certificate
Initial taking over certificateFinal internal contract clearance completion of guarantee
period8. Plant completion report. PG test evaluation and acceptance
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INSTRUMENTS: PRESSURE GUAGE
TP REF: 1.5.1.
No. Activity
Remarks
DEFECTS & OMISSIONS CONTINUATION OVERLEAF
REMARKS
NTPC SIGNATURE
CONTRACTORS SIGNATURE DATE
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Steps Pre-commissioning checks
Trial run of equipments
e.g. Fans and APH commissioning
Hydraulic Test
Chemical cleaning Gas Tightness Test
ESP commng.
Fuel Oil System
Preparation for first light-up
Steam blowing Safety v/v settings
Other boiler Aux. commissioning
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Pre commissioning checks
Physical inspection
Ensuring tightness
Lubrication check
Setting of relief v/v
Operation test on v/vs and fittings
Insulation test on cable/ motor
Rotation checks
Flushing out the oil system
Trial run of motor with all protection for 8 hrs
Coupling of fan with motor
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Trial run of equipments
Commissioning checks
Checking of IGV/ pitch control mechanism
Operation of lub oil pump system Operation of Discharge damper
Starting the fan as recommended by mfd.
8 hrs trial run conductance
Logging parameters.
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Pre commissioning checks for boiler
Hydraulic test
For both drainable and non drainable portions
Filled with DM water. Add 10 ppm ammonia and 200 ppm
hydrazine
All drainable and non drainable parts to be filled through theirbottom drains.
High pressure positive displacement pump is used.
Test pressure as per IBR recommendation.
Pressure should be raised gradually.
After pressurization hold and inspect.
Wet preservation done after draining
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BOILER HYDRAULIC TEST
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CHEMICALS REQUIREMENT
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Pre commissioning checks for boiler
Gas tightness check
Through smoke generator. 24 MKS,40 IBS wt.from defance store.
Run FD and ID.
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AIR AND GAS TIGHTNESS TEST OF
FURNACE AND DUCTS
STAGE 1 : FD fan to air inlet damper of APH
300
mmWC
STAGE II : APH inlet damper to wind box. - 300
mmWC
STAGE III : Wind box to APH gas O/L damper. - 75
mmWC
STAGE IV : APH O/L damper to ESP I/L gate. - 300
mmWC
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AIR AND GAS TIGHTNESS TEST OF
FURNACE AND DUCTS
STAGE V : ESP O/L damper to ID fan I/L damper - 300
mmWC
STAGE VI : ID fan I/L damper to stack.kerosene test.
STAGE VII : PA fan to PAPH I/L damper. (SCAPH bypass,
cold air duct and seal air pipes. - 500 mmWC
STAGE VIII : PAPH air I./L to hot air gates500 mmWC
ESP is tested by air in leak test.
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PROTOCOL ON SMOKE GENERATOR TEST
OF THE BOILER
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ESP commissioning
Physical inspection.
Electrical inspection
Gas distribution test Air load test
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Fuel oil system
Physical inspection.
Flushing of lines.
Trial of pumps. Ignitor and burner housing check.
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Alkali boil-out
Purpose: Chemical cleaning of boiler water & steamsystem to remove loose foreign material, oil, grease etc.
Water Washing
Temporary water filled arrangement. Itcontinues till conductivity of inlet/ outlet water equals.
Process continued nos. of time till conductivity ofwashing water matches with fresh filtered water.
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Alkali boil-out
Alkali boil out Fill water with DM water. Add Trisodium phosphate(1000 PPM 0.1%), Do Decca Hydrate & Hydrazine Hydrate (200PPM 0.02 %)
Filling upto 180 mm. Boiler light up with AB elevation
Pressure raised to 40 Kg/ Cm2.
Hourly blow down given to remove impurities and feeding maintain tokeep drum level.
Oil gun to cut out during blowing
Boiler expansion noted
At the end boiler will be boxed up and hot draining done when pr.is1.5 Kg./Cm2.
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COMMISSIONING PROTOCOL FOR ALKALI BOIL OUT
TRISODIUM PHOSPHATE Kgs ppm
REMARKS:
Manufacturer Customer Engineer
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Acid cleaning
Covering steam and water ckt., economiser,waterwall, Boiler Drum excluding super heaters,reheater & associated piping.
Stage I Acid washingII DM water rinsing
III Citric acid water rinsing
IV DM water rising
V Neutralising with sodium carbonate.VI Passivation 1st stage.
VII Inspection
VIII Passivation 2nd stage.
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Acid cleaning
HCL 4-6 % conc.
Ammonia Bifluoride 1%
Rodine 213 special 0.1 % inhibitor.
Lime
Nitrogen Gas capping arrangement.
Removal of Drum internals
Down comer fitted with orifice. Sup heater steamopening at drum to be plugged by rubber stamp.
S/H to be kept pressurised at 5 Kg/Cm2 withhydrazine.
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Acid cleaning procedure
Fill boiler with water and a circulation flow of 400t/Hr is maintained.
Heat water to 65 deg cen. With steam.
Inhibitor charged and half quantity of ammonia
bifluoride. When the above mixture get dissolved, start acid
dosing.
Concentration should not exceed 6 %.
Temp. is maintained below 70 Deg.
HCL and Iron Conc. Intially goes high then comesdown and became steady.
Constant value of HCL and iron conc. Denotecompletion of acid washing.
Cleaning soln. drained through neutralising pit.
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Rinsing with water.
System filled with water
Temp. raised to 65 Deg.
Water circulation continue.
Water is dump under nitrogen capping.
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Citric acid rinsing.
System filled with water
Temp. raised to 65 Deg.
Citric acid 0.2 % by weight.
Water is recirculated
When inlet outlet sample matches then
declare overWater is dump under nitrogen capping.
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Neutralisation.
System filled with water
Temp. raised to 80 Deg.
Sodium Carbonate 1 %..
Water is recirculated
When inlet outlet sample matches then
declare overWater is dump under nitrogen capping.
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Passivation 1st stage.
Purpose building uniform layer of Magnetite onbare surface obtained after acid cleaning.
System filled with water
Temp. raised to 85 Deg.
300 ppm Hydrazine (9.6 pH)
Water is recirculated
Maintain hydrazine concentration to 150 ppm.
When inlet outlet sample matches then declareover
Water is dump under atmospheric capping.
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Passivation 2nd stage.
Purpose building uniform layer of Magnetite onbare surface obtained after acid cleaning.
System filled with water
Temp. raised to 85 Deg.
300 ppm Hydrazine (9.6 pH)
Boiler lighted up. 40 Kg pr. Raised. Maintain for 20
Hrs. Maintain hydrazine concentration to 150 ppm.
Hot drain at 90 deg.
Water is dump under atmospheric capping.
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STEAM BLOWING
OF
BOILER AND
ASSOCIATED STEAM LINE
INCLUDING
AUXILIARY STEAM LINES
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CLICK ON THE STAGE TO SEE THE ANIMATION
THEORY OF STEAM BLOWING
SCHEME OF STEAM BLOWING
STAGE-1 STEAM BLOWING (SH,M.S LINE UP TO ESV)
STAGE-2A STEAM BLOWING (SH,M.S, CRH LINE)
STAGE-2B STEAN BLOWING (SH,MS,HRH&CRH UP TO DESH)
STAGE-3A STEAM BLOWING (SH, MS, CRH, RH, HRH, UP TO IV)
STAGE-3B STEAM BLOWING (SH, MS, CRH, RH, HRH & LPBP )
STAGE-4A STEAM BLOWING (EXTRN TO BFPDT-A, FROM CRH)
STAGE-4B STEAM BLOWING (EXTRN TO BFPDT-B, FROM CRH)
CLICK / ENTER, AFTER EVERY EVENT IN THE SCHEME TO SEE THESEQUENCE OF EVENTS
STEAM BLOWINGBACK TO
INDEX
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STEAM BLOWING
OBJECTIVE: PURPOSE OF STEAM BLOWING IS TO REMOVESCALES, LOOSE MATERIAL, IRON CUTTINGS etc. THAT MIGHT HAVEBEEN ENTRAPPED IN S.H, STEAM PIPING, REHEATERS DURINGMANUFACTURE.
TECHNIQUE: STEAM BLOWING IS CARRIED OUT BY PUFFINGMETHOD.THIS TECHNIQUE WILL GIVE A THERMAL SHOCK TO THECONTOUR BEING PURGED TO DISLODGE THE SCALES etc. WHICH WILLSUBSEQUENTLY BE REMOVED BY EXPANDING STEAM.
PROCEDURE: FOR BLOWING THE STEAM, RAISE THE BOILER DRUMPRESSURE UPTO 40 TO 50 Ksc; SHUT OFF BOILER FIRING AND OPENTHE ELECTRICALLY OPERATED TEMPORARY VALVES (EOTVs) / BOILERM.S. STOP VALVES AS SHOWN IN THE FOLLOWING SCHEMES.
DRUM LEVEL SHOULD BE MAINTAINED AT LOWEST PORT (VISIBLE
LIMIT) BEFORE THE START OF EACH BLOW TO AVOID WATERDROPLETS CARRYOVER TO THE SATURATED STEAM PIPING.
NUMBER OF BLOWS PER DAY ARE LIMITED TO 8 WITH AN INTERVALOF 1 Hrs.FOR COOLING IN ADDITION TO OVER NIGHT COOLING
SCHEME: STEAM BLOWING IS DONE IN SEVEN STAGES AS
DESCRIBED IN THE FOLLOWING SLIDES.
INDEX
EOTV ASTEAM BLOWING SCHEME BACK TOINDEX
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LPBP V/V
LPBP V/V
TO CONDENSER
HRH LINE
RHI
HDR
RHOHDR
SH
IH
SH
OH
MS STOP V/V
M
SL
ESV
ESVCR
H
NR
V
CRH LINE
HPBP SPOOLPIECE 450
THRO / BLANKFLANGE
DE
SH
EOTV
AB B
C
C
D
D
E
E
--THRO / BLANK FLANGE
--TARGET PLATE-- OPEN INDICATION
-- CLOSE INDICATION
-- R.H & HRH LINE
-- LPBP LINE
-- S.H & MS LINE
-- CRH & HPBP
-- TEMPORARY PIPING
-- PERMANENT PIPING
--UN TREATED PIPE
HPBP LINE
EOTV
ELECTRICALLY OPERATEDTEMPORARY VALVE
HOTVs
HOTV-HAND OPERATEDTEMPORARY VALVE
INDEX
ASTAGE-I EOTVBACK TO
INDEX
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LPBP V/V
LPBP V/V
TO CONDENSE
HRH LINE
RH
IHDR
RHOHDR
S
HIH
S
HOH
MS STOP V/V
MSL
ESV
ESV
C
RH
N
RV
CRH LINE
HPBP SPOOLPIECE 450
THRO / BLANKFLANGE
D
ESH
EOTV
--THRO / BLANK FLANGE
A
C
BB
D
D
E
E
--TARGET PLATE
STAGE I
-- OPEN
-- CLOSE
-- R.H & HRH
-- LPBP
-- S.H & MS LINE
-- CRH & HPBP
-- TEMPORARY PIPING
-- PERMANENT PIPING
--UN TREATED PIPE
MS STOP VALVES IN
OPEN CONDITION
FLANGES "B,"C,"D&"E
ARE BLANKED, "A ISOPENED
STEAM BLOWING IS TO BE
CARRIED OUT USING EOTVS
C
BLOW OFF V/V OPENED AT 50
Ksc & CLOSED AT 25 KscDRUM PRESSURE
STAGE-1 COVERS SUPER
HEATERS & MS LINE UP TOESV
HPBP LINE
HOTVs
INDEX
STAGE-IIA EOTVBACK TO
INDEX
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LPBP V/V
LPBP V/V
TO CONDENSER
HRH LINE
R
HIHDR
RHOHDR
SHIH
SHOH
MS STOP V/V
MSL
ESV
ESVCRH
NRV
CRH LINE
HPBP SPOOLPIECE 450
THRO / BLANKFLANGE
DESH
EOTV
A
A
C
C
BB
D
D
E
E
STAGE IIA
--THRO / BLANK FLANGE
--TARGET PLATE
-- OPEN
-- CLOSE
-- R.H & HRH
-- LPBP
-- S.H & MS LINE
-- CRH & HPBP
-- TEMPORARY PIPING
-- PERMANENT PIPING
--UN TREATED PIPE
MS STOP VALVES IN
OPEN CONDITION
FLANGES A,B,"D&"E
ARE BLANKED, C ISOPENED
STEAM BLOWING IS TO BE
CARRIED OUT USING EOTVS
SUGGESTED BLOWING
PRESSURE IS FROM 50KscTO25 Ksc
STAGE-2 COVERS S.H, MS
LINE,JUMPER CONNECTINGESV & CRH LINE
DESH IN CRH LINE IS NOT TO
BE ERECTED
JUMPER LINE CONN. TO CRH IS
TO BE TAKEN AFTER EOTVsINSTALLED FOR STAGE-1
EOTV
HPBP LINE
HOTVs
INDEX
STAGE-IIB EOTVBACK TO
INDEX
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LPBP V/V
LPBP V/V
TO CONDENSER
HRH LINE
R
HIHDR
RHOHDR
SHIH
SHOH
MS STOP V/V
MSL
ESV
ESVCRH
NRV
CRH LINE
HPBP SPOOLPIECE 450
THRO / BLANKFLANGE
DESH
EOTV
A
A
C
C
BB
D
D
E
E
STAGE IIB
--THRO / BLANK FLANGE
--TARGET PLATE
-- OPEN
-- CLOSE
-- R.H & HRH
-- LPBP
-- S.H & MS LINE
-- CRH & HPBP
-- TEMPORARY PIPING
-- PERMANENT PIPING
--UN TREATED PIPE
EOTVs ARE IN CLOSED
CONDITION
FLANGES A,"D&"E ARE
BLANKED, B&C AREOPENED
STEAM BLOWING IS TO BE
CARRIED OUT USING MSSTOP VALVES
STAGE-2B COVERS S.H, MS
LINE,H.P BYPASS LINE& CRHLINE
DESH IN CRH LINE IS NOT TO
BE ERECTED
EOTV
HPBP LINE
HOTVs
INDEX
ASTAGE-IIIA EOTV
BACK TOINDEX
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LPBP V/V
LPBP V/V
TO CONDENSER
HRH LINE
R
HIHDR
RHOHDR
SHIH
SHOH
MS STOP V/V
MSL
ESV
ESVCRH
NRV
CRH LINE
HPBP SPOOLPIECE 450
THRO / BLANKFLANGE
DESH
EOTV
A
A
C
C
BB
D
D
E
E
STAGE IIIA
--THRO / BLANK FLANGE
--TARGET PLATE
-- OPEN
-- CLOSE
-- R.H & HRH
-- LPBP
-- S.H & MS LINE
-- CRH & HPBP
-- TEMPORARY PIPING
-- PERMANENT PIPING
--UN TREATED PIPE
MS STOP VALVES ARE
IN OPEN CONDITION
FLANGES A,B&"E ARE
BLANKED, C&D AREOPENED
STEAM BLOWING IS TO BE
CARRIED OUT USING EOTVs
STAGE-3A COVERS S.H, MS
LINE,JUMPER CONNG. ESV&CRH LINE CRHLINE R.H HRH
DESH IN CRH LINE CAN BE
ERECTED
SUGGESTED BLOWING
PRESSURE IS 50 KscTO 25Ksc
EOTV
HPBP LINE
HOTVs
INDEX
ASTAGE-IIIB EOTVBACK TO
INDEX
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LPBP V/V
LPBP V/V
TO CONDENSER
HRH LINE
RH
IHDR
RH
OHDR
S
HIH
S
HOH
MS STOP V/V
MSL
ESV
ESVCRH
NRV
CRH LINE
HPBP SPOOLPIECE 450
THRO / BLANKFLANGE
DESH
EOTV
A
A
C
C
BB
D
D
E
E
STAGE IIIB
--THRO / BLANK FLANGE
--TARGET PLATE
-- OPEN
-- CLOSE
-- R.H & HRH
-- LPBP
-- S.H & MS LINE
-- CRH & HPBP
-- TEMPORARY PIPING
-- PERMANENT PIPING
--UN TREATED PIPE
MS STOP VALVES IN
OPEN CONDITION
FLANGES A,B&"D ARE
BLANKED, C,"E AREOPENED
STEAM BLOWING IS TO BE
CARRIED OUT USING EOTVS
STAGE-3B COVERS S.H, MS
LINE,JUMPER CONNG.ESV &CRH CRH LINE R.H HRH LPBP
DESH IN CRH LINE CAN BE
ERECTED
HPBP LINE
HOTVs
INDEX
STAGE-IV A BACK TOINDEX
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FROM CRH
NEAR DEAERATORFROM IP / LP CROSSAROUND TO DEAERATORFROM CROSS
AROUND PIPES
FROM IP / LP CROSSAROUND PIPE
FROM APRDSHEADER TDBFP-A TDBFP-B
CRH-1 CRH-3
CRH-2 CRH-4
INDEX
STAGE-IV B BACK TOINDEX
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NEAR DEAERATOR
FROM CRHFROM IP / LP CROSSAROUND TO DEAERATORFROM CROSS
AROUND PIPES
FROM IP / LP CROSSAROUND PIPE
FROM APRDSHEADER TDBFP-A TDBFP-B
CRH-1CRH-3
CRH-2CRH-4
INDEX
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HYDROTEST OF LUB OIL LINES.
HYDROTEST OF COOLERS.
ACID CLEANING OF LUB OIL LINES.
TRIAL RUN LUB OIL MOTORS.
OIL FILLING
LUB OIL FLUSHING.
CONNECTION OF LUB OIL LINES.
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1.DM WATER FLUSHING FOR 10min.
2.SOAKING WITH 5%HCL SOLUTION AND INHIBITOR0.2% RHODINE 213 SPL.SOAKING TIME-4 HRS.
3.DRAINIG OF ACID SOLUTION AND FLUSHING WITHDM WATER FOR 10MIN.
4.SOAKING WITH SODIUM NITITRITE(2%) AND LIQUORAMMONIA 5% FOR 30MIN.
5. FLUSHING WITH DM WATER FOR 10MIN.
6.CLEANING OF ALL PIPES BY BLOWING WITHCOMPRESSED AIR FOR DRYING PURPOSE.
7. FILLING OF OIL PIPELINE AND ENSURING UNIFORMCOATING OF OIL FILM OVER ENTIRE INNERPERIPHERY.
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LUB OIL FLUSHING WITH BYPASSING BRGSAND SERVOMOTOR.
LUB OIL FLUSHING WITH BRGS. AND
SERVOMOTOR IN CIRCUIT. COOLING WATER GOING TO LUB OIL
COOLERS FLUSHING.
RELIEF VALVE PRESSURE ADJUSTMENT.
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CHECK FOR THE FREENESS OF FAN ROTOR.
CHECK FOR THE INDICATION OF RTD ANDVIBRATION PICKUPS.
CHECK THE OPERATION BLADE PITCH INCONTROL ROOM AS WELL AS IN LOCAL.
CHECK FOR THE OPERATION OF DISCHARGE
DAMPER/GATE.
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CHECK WHETHER ALL PROTECTIONS ANDPERMISSIVES ARE IN SERVICE.
CHECK FOR THE CLEANLINESS OF
DISCHARGE DUCT AND ALL OTHERINTERCONNECTION OF DUCTS.
CHECK FOR THE CLEANLINESS OF SUCTIONCHAMBER.
CHECK FOR BLADE CLEARANCES FROM THEFAN CASING.
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CHECK FOR THE AVAILABLITY OF COOLINGWATER.
CHECK WHETHER LUB OIL COOLERS ARE
CHARGED FROM WATER SIDE. TAKE THE TRIAL RUN OF FAN AFTER GETTING
CLEARANCES FROM VERIOUR CONCERNEDDEPARTMENTS.
BRG TEMP,VIBRATION READINGS TO BERECORDED ON HOURLY BASIS.
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CHECK FOR THE CABLING OF MOTOR.
CHECK FOR PROPER EARTHING OF MOTOR.
CHECK FOR ROTOR FREENESS.
CHECK FOR CONTROL ROOM INDICATIONS OFBRG TEMP AND VIBRATIONS.
CHECK FOR THE LOCATION OF EPB.
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CHECK FOR THE AVAILABILITY OF MOTORCOOLING WATER.
CHECK FOR OIL LEVEL IN BRGS.
CHECK FOR THE HEALTYNESS OF COOLINGWATER FLOW SWITCH.
ENSURE THE FLUSHING COOLING WATER
LINES TO MOTOR.
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CHECK FOR THE FREENESS OF FAN ROTOR.
CHECK FOR THE INDICATION OF RTD ANDVIBRATION PICKUPS.
CHECK THE OPERATION OF IGV IN CONTROLROOM AS WELL AS IN LOCAL.
CHECK FOR THE OPERATION OF DISCHARGE
GATE/INLET AND OUTLET GATES.
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CHECK WHETHER ALL PROTECTIONS ANDPERMISSIVES ARE IN SERVICE.
CHECK FOR THE CLEANLINESS OF
DISCHARGE DUCT AND ALL OTHERINTERCONNECTION OF DUCTS.
CHECK FOR THE CLEANLINESS OF SUCTIONCHAMBER.
CHECK FOR BLADE CLEARANCES FROM THEFAN CASING.
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ENSURE THE FLUSHING OF JACKET COOLINGWATER DONE BEFORE.
ENSURE LUB OIL LINE VALVES GOING TO
INDIVIDUAL BRGS ARE IN OPEN CONDITION. FAN TO BE STARTED AND TRIAL RUN TO BE
TAKEN FOR 8HRS.
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CHECK FOR RADIAL CLEARANCE OF RADIALSEALS AS PER DESIGN.
CHECK FOR AXIAL CLEARANCE OF AXIAL
SEALS AS PER DESIGN. CHECK FOR PROPER CLEARANCE OF
CIRCUMFERENTIAL SEALS.
CHEACK FOR THE CLEANLINESS OF AIRPREHEATER BASKETS.
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ENSURE THE CLEANING OF PROTECTIVECOATING OF AIRPREHEATER.
CHECK FOR TRAVEL PATH OF AIRPREHEATER
SOOTBLOWING.
ENSURE THAT NO LOOSE PARTS ARE HANGING.
BEFORE STARTING AIRPREHEATER ALL MANUAL
DOORS ARE PROPERLY TIGHTENED.
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ENSURE THE COMPLETION OF MOTOR NOLOAD TRIAL RUN FOR 8HRS.
ENSURE THE COMPLETION OF LUB OIL
FLUSHING OF SUPPORT/GUIDE BRGS. FLUSH THE COOLING WATER LINES.
CHECK FOR THE CLEANLINESS OF AIR
RECEIVER TANK. FLUSH THE SERVICE AIR LINES GOING TO AIR
RECEIVER TANK.
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FLUSH THE OIL CARRYOVER PROBE COOLINGLINES.
FLUSH AIRPREHEATER WATER WASH LINES.
ENSURE THE CLEANLINESS OF WATER WASHLINE NOZZLES.
ENSURE THAT FIRE FIGHTING LINES ARE
CONNECTED AS PER DRAWING.
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ENSURE FLUSHING OF FIRE WATER LINES.
ENSURE THE CLEANLINESS OF FIRE FIGHTINGNOZZLES.
CHECK FOR THE PROPER PLACING FIRESENSING PROBES.
FLUSH AIR LINE COMING FROM AIR RECEIVER
TANK.
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CHECK FOR HEALTHINESS OF SUPPORTBRG/GUIDE BRG RTDS.
ROTATE FREELY WITH HAND AND OBSERVE
ANY ABNORMAL SOUND. START AIR PREHEATER WITH AIRMOTOR AND
ROTATE IT FOR SOMETIME.
START MAIN DRIVE OF AIRPREHEATER.
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CHECK THE AIRPREHEATER MAIN DRIVE TOAIRMOTOR CHANGEOVER INTERLOCKHEALTINESS.
CHECK FOR VIBRATIONS OF MAIN DRIVE. CHECK FOR THE HEALTHYNESS OF
AIRMOTOR PRESSURE SWITCHES.
READINESS FOR FIRST BOILER LIGHT UP
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SAFETY VALVE FLOATING OF MAIN BOILER
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Test all the safety valves one by one by actually raising the pressure of
the boiler to set values of the valves and also to set the blowdown of
the valve within 3% - 5% of the set value.
Safety valve with higher set pressure will be floated first followed by
other valves in descending order of set valves. If set pressures are samefor few valves, then any valve can be taken for floating.
When the pressure reaches around 180-190 KSC, the safety
valves is warmed up by manual popping and for this, the popping
arrangement provided is made use off through rope. Once or
twice the manual popping done to clear the safety valves path and
also to warm up the valve.
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