dwg. no. aps-fc-000(1) / aps start-up flow chart … su mode selection start hrsg1 hp steam pr. <...
TRANSCRIPT
APS-FC-000(1), Rev. A
Dwg. No. APS-FC-000(1) / APS Start-up Flow Chart Drawing List
APS SU FC Drawing List
APS-FC-000(1), Rev. A :
APS-FC-000(2), Rev. A :
APS-FC-001, Rev. A :
Drawing List
Remakrs
HRSG1 & 2 Start-up Mode Selection
APS-FC-002, Rev. A :
APS-FC-003, Rev. A :
APS-FC-004, Rev. A :
APS-FC-104, Rev. A :
APS-FC-006, Rev. A :
APS-FC-106, Rev. A :
APS-FC-008, Rev. A :
APS-FC-108, Rev. A :
APS-FC-009, Rev. A :
APS-FC-109, Rev. A :
APS-FC-010, Rev. A :
APS-FC-110, Rev. A :
APS-FC-011, Rev. A :
APS-FC-111, Rev. A :
APS-FC-012, Rev. A :
APS-FC-112, Rev. A :
APS-FC-013, Rev. A :
APS-FC-113, Rev. A :
APS-FC-014, Rev. A :
APS-FC-114, Rev. A :
APS-FC-015, Rev. A :
APS-FC-016, Rev. A :
Target Load Input & ST Start-up Mode Selection
GT(+ HRSG) SU Order Selection
HRSG1 Start-up Preparation
HRSG2 Start-up Preparation (Same with HRSG1)
HRSG1 Piping Drain Operation
HRSG2 Piping Drain Operation (Same with HRSG1)
HRSG1 Start-up Preparation, GT1 Start-up and Synchronization
HRSG2 Start-up Preparation, GT2 Start-up and Synchronization (Same with HRSG1 & GT1)
HRSG1 Temp Matching, Bypass Valve Set-up, Isolation Valve Open
HRSG2 Temp Matching, Bypass Valve Set-up, Isolation Valve Open (Same with HRSG1)
ST Piping Drain Operation by LEAD HRSG1
ST Piping Drain Operation by LEAD HRSG2 (Same with HRSG1)
ST Start-up by LEAD HRSG1
ST Start-up by LEAD HRSG2 (Same with HRSG1)
LEAD GT1 Ramp-up to 50% Load(100 MW)
LEAD GT2 Ramp-up to 50% Load(100 MW) (Same with GT1)
LEAD & LAG HRSG1 LP Addition to ST
LEAD & LAG HRSG2 LP Addition to ST (Same with HRSG1)
LAG HRSG1 HP Addition to ST
LAG HRSG2 HP Addition to ST (Same with HRSG1)
Both GT s Ramp-up to Target Load
APS SU Start & End
Dwg. No. Title
ENGS
OFT
APS-FC-000(2), Rev. A
Dwg. No. APS-FC-000(2) / Remarks
1. Abbreviation :
APS : Automatic Plant Start-up and Shut-downST : Steam TurbineGT : Gas TurbineST TCS : Steam Turbine Control SystemGT TCP : Gas Turbine Control PanelHP : High PressureCRH : Cold ReheatHRH : Hot ReheatCMV : Combined Main Valve (at ST HP Inlet)CRV : Combined Reheat Valve (at ST HRH Inlet)CB : Command Button with OK and Cancel ConfirmationSLLoad : Spinning Reserve Load (of GT)
2. Expression in Flow Charts :
Commands are written in capital letters. For example, XV1007 AUTO/OPEN stands for transferring to AUTO mode and then OPEN XV1007, whereas AUTO/(Open) stands for transferring to AUTO mode that results in opening of XV1007.
4. HP/HRH Steam Temperature Settings :
HRSG Attemperator Control(1) : 560 oC GT Runback to Rated Temp : > 578.5 oCGT Runback to FSNL AND ST Trip : > 583 oC
5. HRSG LP Econ Bypass Valve :
HRSG LP steam system has no bypass valve dumping to condenser. Instead, HRSG LP Economizer bypass valve controls LP steam generation in start-up, shut-down and trip cases.
3. CAS/AUTO/MANUAL :
CAS : Operated by loop/logic where set value is given by loop/logic itself.AUTO : Operated by loop/logic, where set value is input by Operator.MANUAL : Operated by opening value that is input by Operator.
6. HRSG Start-up Vent Valve Operation :
In APS-FC-011 and 013, operation of HP and LP start-up vent valves is mentioned. Even though start-up vent valve operation is not mentioned in other flow charts, start-up vent valves are operated principally as below:
When following conditions are satisfied in relevant steam system, the start-up vent valve of relevant steam system opens to its 10% position.- GT is fired, AND- Steam pressure is higher than 0.7 kg/cm2g, AND- Isolation valve is not fully open, AND- Bypass valve is not operating. (in case of LP, LP Econ Bypass Valve)
When following conditions are satisfied in relevant steam system, the start-up vent valve of relevant steam system closes full.- GT is shut down, OR- Steam pressure is lower than 0.7 kg/cm2g.
When relevant drum temperature change rate exceeds limit value, relevant start-up vent valve opens mitigate the change rate. Start-up vent valves shall react later than bypass valve or steam turbine.
When start-up vent valve closes, its set value of open is set at a pressure higher than the maximum pressure set value of relevant bypass valve, but lower than relevant safety valve, so that, when over pressure occurs in relevant steam system, bypass valve opens firstly, then start-up vent valve opens, and lastly safety valve opens.
: Input, Output, Display
: Program Start / End
: Decision
: Input, Switch, Push Button
: Process
: Manual Operation
: Other Module / Process
< Symbol >
ENGS
OFT
HRSG1 SU Mode Selection Start
HRSG1 HP Steam Pr. < 3.51 atg
HRSG1 HP COLD
HRSG1 HP Steam Pr. < 63.8 atg
No
HRSG1 HP WARM
HRSG1 HP HOT
No
HRSG1 SU Mode Selection End
HRSG1 IP Steam Pr. < 0.7 atg
HRSG1 IP COLDYes
HRSG1 IP Steam Pr. < 7.67 atg
No
HRSG1 IP WARM
No
HRSG1 IP HOT
Yes
Yes
Yes
HRSG1 LP Steam Pr. < 0.7 atg
HRSG1 LP COLD
HRSG1 LP Steam Pr. < 3.51 atg
No
HRSG1 LP WARM
HRSG1 LP HOT
No
Yes
Yes
HRSG1 Start-up Mode Selection
IPHPLP
Dwg. No. APS-FC-001, Rev. A
Dwg. No. APS-FC-001 / HRSG1 & 2 Start-up Mode Selection
HRSG2 Start-up Mode Selection (Same with HRSG1)
HRSG2 SU Mode Selection Start
HRSG2 HP Steam Pr. < 3.51 atg
HRSG2 HP COLD
HRSG2 HP Steam Pr. < 63.8 atg
No
HRSG2 HP WARM
HRSG2 HP HOT
No
HRSG2 SU Mode Selection End
HRSG2 IP Steam Pr. < 0.7 atg
HRSG2 IP COLDYes
HRSG2 IP Steam Pr. < 7.67 atg
No
HRSG2 IP WARM
No
HRSG2 IP HOT
Yes
Yes
Yes
HRSG2 LP Steam Pr. < 0.7 atg
HRSG2 LP COLD
HRSG2 LP Steam Pr. < 3.51 atg
No
HRSG2 LP WARM
HRSG2 LP HOT
No
Yes
Yes
IPHPLP ENGS
OFT
Dwg. No. APS-FC-002, Rev. A
Dwg. No. APS-FC-002 / Target Load Input & ST Start-up Mode Selection
ST SU Mode Selection
Start
ST Metal Temp < 250 oC
ST COLD
ST Metal Temp < 370 oCNo
ST WARM
ST VERY HOT
NoST SU Mode
SelectionEnd
YesYes
ST Metal Temp < 520 oC
No
ST HOT
Yes
Note 1ST metal temperature is selected as the lower value of HP turbine first stage inner surface metal temperature and IP turbine bowl inner surface metal temperature.
Note 2ST start-up mode selection shall be performed by ST TCS and informed to DCS.
ST Metal Temp < 150 oC
ST AMBIENT
COLD
Yes
No
Target Load Input Start
BASE LOADTARGET (CB)
CCPP OUTPUTTARGET (CB)
Change AGC Target CCPP OUTPUT to This APS CCPP OUTPUT VALUE
CCPP OUTPUTTARGET VALUEInput by Operator(Input Textbox)
CCPP OUTPUT TARGET
BASE LOAD TARGET
After Both GT’s reach their 50% load(100 MW) by APS, ramp-up to target CCPP output shall be
performed by Automatic Generation Control(AGC).
Target Load Input End
Target Load Input
ST Start-up Mode SelectionENGS
OFT
Dwg. No. APS-FC-003, Rev. A
Dwg. No. APS-FC-003 / GT(+ HRSG) SU Order Selection
Train SU Order Selection Start
GT1 LEAD(CB)
GT1 LEAD
No
GT1 LAG(CB)
GT1 LAG
No
Yes
GT1 IDLE/RUN(CB)
GT1 IDLE/RUN
Yes(N/A)
Yes(N/A)
Train SU Order Selection End
GT2 LEAD GT2 LAG
GT2 LEAD(CB)
GT2 LEAD
No
GT2 LAG(CB)
GT2 LAG
No
Yes
GT2 IDLE/RUN(CB)
GT2 IDLE/RUN
Yes(N/A)
Yes(N/A)
GT1 LEAD GT1 LAG
ENGS
OFT
APS-FC-004, Rev. A
Dwg. No. APS-FC-004 / HRSG1 Start-up Preparation
HRSG1 Start-up Preparation Start
GT1 LEAD
HRSG2 Isolation :
HRSG2 HP Isolation Valve CLOSEHRSG2 HP Isolation Bypass Valve CLOSEHRSG2 HRH Isolation Valve CLOSEHRSG2 CRH Isolation Valve CLOSEHRSG2 CRH Isolation Bypass Valve CLOSEHRSG2 LP Isolation Valve CLOSEHRSG2 LP Isolation Bypass Valve CLOSE
HRSG2 Isolation Completed
Yes
No(Wait)
HRSG1 Isolation :
HRSG1 HP Isolation Valve CLOSEHRSG1 HP Isolation Bypass Valve CLOSEHRSG1 HRH Isolation Valve CLOSEHRSG1 CRH Isolation Valve CLOSEHRSG1 CRH Isolation Bypass Valve CLOSEHRSG1 LP Isolation Valve CLOSEHRSG1 LP Isolation Bypass Valve CLOSE
Yes
HRSG1 Isolation Completed
No(Wait)
No(GT1 LAG or IDLE/RUN)
GT1 IDLE/RUN
Yes
Yes(GT1 IDLE)
HRSG Isolation is required even if GT SU ORDER is LEAD, because HRSG isolation is required for GT
RESET for start-up.If HRSG isolation is not the
condition of GT RESET, this step is not required.
HRSG1 MOV Set-up :
HP/IP/LP Feedwater Isolation Valve OPENHP/IP/LP Feedwater Vent Valve CLOSEHP/IP/LP Drum CBD Valve CLOSEHP/IP/LP Drum IBD Valve CLOSEHP/IP/LP Drum CBD Vent Valve CLOSEHP/IP/LP Drum Vent Valve CLOSEHP/IP/LP Econ Vent Valve CLOSEHP/IP/LP Superheater Vent Valve CLOSEHP/RH DSH Vent Valve CLOSEHP/RH DSH Spray Water Valve CLOSEHP/IP/LP Sparging Steam Valve CLOSEIP Isolation Valve OPENStack Damper OPEN
No(GT1 LEAD or LAG)
HRSG1 MOV Set-up Completed
No(Wait)
HRSG1 Auto Control ON according to Manufacturer’s Loop Logic :
HP/IP Drum IBD Valves AUTOHP/IP/LP Superheater Drain Valves AUTOReheater Drain Valves AUTOHP/RH/IP/LP Start-up Vent Valves AUTOHP/IP/LP Feedwater Control Valves AUTOHP/RH Spray Water Control Valves AUTOHRH Bypass Valve Preheat Valve AUTOLP Econ Recirculation Control AUTOLP Econ Recirculation Pumps AUTO/START
HRSG1 BOP System in SERVICE :
Condensate System in SERVICE by- CEP A or B RUN- CEP Discharge Press > 20.5 atg
CW System in SERVICE by- CWP A or B RUN
HRSG1 BFP System in SERVICE by- BFP RUN
Chemical Dosing System in SERVICE by- Operator Confirmation
HRSG1 BOP System in SERVICE
Yes
Yes
No(Wait)
HRSG1 AUTO Control ON
No(Wait)
HRSG1 Drums in Start-up Level :
HP Drum Level < (-) 250 mmIP Drum Level < (-) 250 mmLP Drum Level < (-) 250 mm
Yes
HRSG1 Start-up Preparation End
HRSG1 Drums Start-up Level OK
No(Wait)
Yes
GT1 LAG
Yes(GT1 LAG)
GT1 Synchronized
No(GT1 IDLE/RUN)
No(GT1 IDLE)
Yes(GT1 RUN)
ENGS
OFT
APS-FC-104, Rev. A
Dwg. No. APS-FC-104 / HRSG2 Start-up Preparation (Same with HRSG1)
HRSG2 Start-up Preparation Start
GT2 LEAD
HRSG1 Isolation :
HRSG1 HP Isolation Valve CLOSEHRSG1 HP Isolation Bypass Valve CLOSEHRSG1 HRH Isolation Valve CLOSEHRSG1 CRH Isolation Valve CLOSEHRSG1 CRH Isolation Bypass Valve CLOSEHRSG1 LP Isolation Valve CLOSEHRSG LP Isolation Bypass Valve CLOSE
HRSG1 Isolation Completed
Yes
No(Wait)
HRSG2 Isolation :
HRSG2 HP Isolation Valve CLOSEHRSG2 HP Isolation Bypass Valve CLOSEHRSG2 HRH Isolation Valve CLOSEHRSG2 CRH Isolation Valve CLOSEHRSG2 CRH Isolation Bypass Valve CLOSEHRSG2 LP Isolation Valve CLOSEHRSG2 LP Isolation Bypass Valve CLOSE
Yes
HRSG2 Isolation Completed
No(Wait)
No(GT2 LAG or IDLE/RUN)
GT2 IDLE/RUN
Yes
Yes(GT2 IDLE)
HRSG2 MOV Set-up :
HP/IP/LP Feedwater Isolation Valve OPENHP/IP/LP Feedwater Vent Valve CLOSEHP/IP/LP Drum CBD Valve CLOSEHP/IP/LP Drum IBD Valve CLOSEHP/IP/LP Drum CBD Vent Valve CLOSEHP/IP/LP Drum Vent Valve CLOSEHP/IP/LP Econ Vent Valve CLOSEHP/IP/LP Superheater Vent Valve CLOSEHP/RH DSH Vent Valve CLOSEHP/RH DSH Spray Water Valve CLOSEHP/IP/LP Sparging Steam Valve CLOSEIP Isolation Valve OPENStack Damper OPEN
No(GT2 LEAD or LAG)
HRSG2 MOV Set-up Completed
No(Wait)
HRSG2 Auto Control ON according to Manufacturer’s Loop Logic :
HP/IP Drum IBD Valves AUTOHP/IP/LP Superheater Drain Valves AUTOReheater Drain Valves AUTOHP/RH/IP/LP Start-up Vent Valves AUTOHP/IP/LP Feedwater Control Valves AUTOHP/RH Spray Water Control Valves AUTOHRH Bypass Valve Preheat Valve AUTOLP Econ Recirculation Control AUTOLP Econ Recirculation Pumps AUTO/START
HRSG2 BOP System in SERVICE :
Condensate System in SERVICE by- CEP A or B RUN- CEP Discharge Press > 20.5 atg
CW System in SERVICE by- CWP A or B RUN
HRSG2 BFP System in SERVICE by- BFP RUN
Chemical Dosing System in SERVICE by- Operator Confirmation
HRSG2 BOP System in SERVICE
Yes
Yes
No(Wait)
HRSG2 AUTO Control ON
No(Wait)
HRSG2 Drums in Start-up Level :
HP Drum Level < (-) 250 mmIP Drum Level < (-) 250 mmLP Drum Level < (-) 250 mm
Yes
HRSG2 Start-up Preparation End
HRSG2 Drums Start-up Level OK
No(Wait)
Yes
GT2 LAG
Yes(GT2 LAG)
GT2 Running
No(GT2 IDLE/RUN)
No(GT2 IDLE)
Yes(GT1 RUN)
HRSG Isolation is required even if GT SU ORDER is LEAD, because HRSG isolation is required for GT
RESET for start-up.If HRSG isolation is not the
condition of GT RESET, this step is not required.
ENGS
OFT
APS-FC-006, Rev. A
Dwg. No. APS-FC-006 / HRSG1 Piping Drain Operation
Block AUTO operation and then open drain valves (See Note 1):
XV1005 MANUAL/OPENXV1006 MANUAL/OPEN
Note 1 :XV1005 : Auto drain valve between HP stop/check valve and HP isolation MOVXV1006 : Auto drain valve just upstream of HP isolation MOV
HRSG1 HPPr > 0.7 atg
No (Wait)
Yes
TI1005 > 427 oC ORHRSG1 HP Iso Vv Full Open
No (Wait)
Put drain valves in AUTO operation :
XV1005 AUTO/(Close)
Yes
Put drain valves in AUTO operation :
XV1006 AUTO/(Close)
HR
SG
1 H
P Is
olat
ion
Val
ve F
ull O
pen
Note 4 :APS logic of HRSG superheater & reheater drain valves shall be same with that of XV1005 / XV1016 / XV1019.
Block AUTO operation and then open drain valves (See Note 2.):
XV1016 MANUAL/OPENXV1017 MANUAL/OPENXV1033 MANUAL/OPEN
HRSG1 HRHPr > 0.7 atg
No (Wait)
Yes
TI1014 > 427 oC ORHRSG1 HRH Iso Vv Full Open
No (Wait)
Put drain valves in AUTO operation :
XV1016 AUTO/(Close)XV1033 AUTO/(Close)
YesHR
SG
1 H
RH
Isol
atio
nV
alve
Ful
l Ope
n
Note 2 :XV1016 : Auto drain valve in HRH bypass valve branch pipingXV1033 : Auto drain valve in CRH piping
(XV1033 is open or lose by drain pot level)XV1017 : Auto drain valve just upstream of HRH isolation MOV
Block AUTO operation and then open drain valves (See Note 3.):
XV1019 MANUAL/OPENXV1020 MANUAL/OPEN
HRSG1 LPPr > 0.7 atg
No (Wait)
Yes
(GT1 Output > 10 MW)
5 min. elapsed ORHRSG1 LP Iso Vv Full Open
No (Wait)
Put drain valves in AUTO operation :
XV1019 AUTO/(Close)
Yes
Put drain valves in AUTO operation :
XV1020 AUTO/(Close)
HR
SG1
LP Is
olat
ion
Val
ve F
ull O
pen
Note 3 :XV1019 : Auto drain valve upstream of LP stop/check valveXV1020 : Auto drain valve between LP stop/check valve and LP isolation MOV
General (See Note 4.)
A(008, B)
C(010, C)
B(010, D)
D(010, E)TI1006 > 427 oC OR
HRSG1 HP Iso Valve Full Open
Yes
No(Wait)
Put drain valves in AUTO operation :
XV1017 AUTO/(Close)
TI1015 > 427 oC ORHRSG1 HRH Iso Vv Full Open
No (Wait)
Yes
HRSG1 LP Iso Vv Full Open
Yes
No (Wait)
Note 5 :427 oC, has been selected for protection of the drain tank made of carbon steel.
ENGS
OFT
APS-FC-106, Rev. A
Dwg. No. APS-FC-106 / HRSG2 Piping Drain Operation (Same with HRSG1)
Block AUTO operation and then open drain valves (See Note 1):
XV2005 MANUAL/OPENXV2006 MANUAL/OPEN
Note 1 :XV2005 : Auto drain valve between HP stop/check valve and HP isolation MOVXV2006 : Auto drain valve just upstream of HP isolation MOV
HRSG2 HPPr > 0.7 atg
No (Wait)
Yes
TI2005 > 427 oC ORHRSG2 HP Iso Vv Full Open
No (Wait)
Put drain valves in AUTO operation :
XV1005 AUTO/(Close)
Yes
Put drain valves in AUTO operation :
XV2006 AUTO/(Close)
HR
SG
2 H
P Is
olat
ion
Val
ve F
ull O
pen
Note 4 :APS logic of HRSG superheater & reheater drain valves shall be same with that of XV2005 / XV2016 / XV2019.
Block AUTO operation and then open drain valves (See Note 2.):
XV2016 MANUAL/OPENXV2017 MANUAL/OPENXV2033 MANUAL/OPEN
HRSG2 HRHPr > 0.7 atg
No (Wait)
Yes
TI2014 > 427 oC ORHRSG2 HRH Iso Vv Full Open
No (Wait)
Put drain valves in AUTO operation :
XV2016 AUTO/(Close)XV2033 AUTO/(Close)
YesHR
SG
2 H
RH
Isol
atio
nV
alve
Ful
l Ope
n
Note 2 :XV2016 : Auto drain valve in HRH bypass valve branch pipingXV2033 : Auto drain valve in CRH piping
(XV2033 is open or lose by drain pot level)XV2017 : Auto drain valve just upstream of HRH isolation MOV
Block AUTO operation and then open drain valves (See Note 3.):
XV2019 MANUAL/OPENXV2020 MANUAL/OPEN
HRSG2 LPPr > 0.7 atg
No (Wait)
Yes
(GT2 Output > 10 MW)
5 min. elapsed ORHRSG2 LP Iso Vv Full Open
No (Wait)
Put drain valves in AUTO operation :
XV2019 AUTO/(Close)
Yes
Put drain valves in AUTO operation :
XV2020 AUTO/(Close)
HR
SG
2 LP
Isol
atio
nV
alve
Ful
l Ope
n
Note 3 :XV2019 : Auto drain valve upstream of LP stop/check valveXV2020 : Auto drain valve between LP stop/check valve and LP isolation MOV
General (See Note 4.)
A(108, B)
C(110, C)
B(110, D)
D(110, E)TI2006 > 427 oC OR
HRSG2 HP Iso Valve Full Open
Yes
No(Wait)
Put drain valves in AUTO operation :
XV2017 AUTO/(Close)
TI2015 > 427 oC ORHRSG2 HRH Iso Vv Full Open
No (Wait)
Yes
HRSG2 LP Iso Vv Full Open
Yes
No (Wait)
Note 5 :427 oC, has been selected for protection of the drain tank made of carbon steel.
ENGS
OFT
APS-FC-008, Rev. A
Dwg. No. APS-FC-008 / HRSG1 Start-up Preparation, GT1 Start-up and Synchronization
HRSG1 Isolation Bypass Valve Open for Piping Warm-up :
HP Isolation Bypass Valve OPENCRH Isolation Bypass Valve OPENLP Isolation Bypass Valve OPEN
GT1 LEAD OR GT1 IDLE/RUN
HRSG1 Start-up Preparation(APS-FC-004)
APS SU Start
Yes
GT2 SynchronizedNo(GT1 LAG)
Yes
No (Wait)
HRSG1 HP/HRH/LP Bypass Valve Preparation :
HP Bypass Valve Quick Close RESETHP Bypass Valve MANUAL/CLOSEHP Bypass Spray Isolation Valve AUTO/(Close)HP Bypass Spray Control Valve MANUAL/CLOSEHRH Bypass Valve Quick Close RESETHRH Bypass Valve MANUAL/CLOSEHRH Bypass Spray Isolation Valve AUTO/(Close)HRH Bypass Spray Control Valve MANUAL/CLOSELP Econ Bypass Valve CAS / (Set at 2.0 atg)
GT1 RESET for Trip and Runback
GT1 RESETCompleted No
Clear GT1 Trip or Runback Conditions
(by Operator)
GT1 Fuel Gas System Preparation :
Fuel Gas Supply Header Valve AUTO/OPENFuel Gas Supply Header Vent Valve AUTO/CLOSEIP Feedwater to FG Heater Vent Valve AUTO/CLOSEIP Feedwater to FG Heater Valves AUTO/OPENIP Feedwater Return Vent Valve AUTO/CLOSEIP Feedwater Return Valves AUTO/OPENFuel Gas Temp Control Valve CAS/(10% Open)
Yes
GT1 START(CB)
Send “CUSTOMER PERMISSIVE TO START” signal to GT1 TCP
GT1 “READY TO START”signal from GT1 TCP
Received
Turn on GT1 “REMOTE” at GT1 TCP
(by Operator)
No (Wait)
Yes
GT1 Ready for Synchronization at GT1
TCP
Send GT1 “START” signal to GT1 TCP
No (Wait)
GT1 Automatic Generation Control MANUAL
GT1 GCB “AUTO SYNCHRO” Selected
No
MANUAL SYNCHRO at GT1 TCP
(by Operator)
Yes
GT1 Synchronized and loaded to SRLoad by GT1 TCP
Yes
A(009, A)Yes
GT1 Output > 10 MW
No (Wait)
B(006, A)Yes
GT1 TCP “REMOTE” Selected
No
Yes
GT1 Start
GT1 Synchronized
GT1 Ready to StartYes
C(016, A)
GT1 IDLE/RUN
No
D(016, G)
Yes(APS SU End)
Early opening of isolation bypass valves is better for
piping warming-up, especially in case of LAG start-up of HRSG2 located
far from ST.
For making APS control GT1
ENGS
OFT
APS-FC-108, Rev. A
Dwg. No. APS-FC-108 / HRSG2 Start-up Preparation, GT2 Start-up and Synchronization (Same with HRSG1 & GT1)
HRSG2 Isolation Bypass Valve Open for Piping Warm-up :
HP Isolation Bypass Valve OPENCRH Isolation Bypass Valve OPENLP Isolation Bypass Valve OPEN
GT2 LEAD OR GT2 IDLE/RUN
HRSG2 Start-up Preparation(APS-FC-104)
APS SU Start
Yes
GT1 SynchronizedNo(GT2 LAG)
Yes
No (Wait)
HRSG2 HP/HRH/LP Bypass Valve Preparation :
HP Bypass Valve Quick Close RESETHP Bypass Valve MANUAL/CLOSEHP Bypass Spray Isolation Valve AUTO/(Close)HP Bypass Spray Control Valve MANUAL/CLOSEHRH Bypass Valve Quick Close RESETHRH Bypass Valve MANUAL/CLOSEHRH Bypass Spray Isolation Valve AUTO/(Close)HRH Bypass Spray Control Valve MANUAL/CLOSELP Econ Bypass Valve CAS / (Set at 2.0 atg)
GT2 RESET for Trip and Runback
GT2 RESETCompleted No
Clear GT2 Trip or Runback Conditions
(by Operator)
GT2 Fuel Gas System Preparation :
Fuel Gas Supply Header Valve AUTO/OPENFuel Gas Supply Header Vent Valve AUTO/CLOSEIP Feedwater to FG Heater Vent Valve AUTO/CLOSEIP Feedwater to FG Heater Valves AUTO/OPENIP Feedwater Return Vent Valve AUTO/CLOSEIP Feedwater Return Valves AUTO/OPENFuel Gas Temp Control Valve CAS/(10% Open)
Yes
GT2 START(CB)
Send “CUSTOMER PERMISSIVE TO START” signal to GT2 TCP
GT2 “READY TO START”signal from GT2 TCP
Received
Turn on GT2 “REMOTE” at GT2 TCP
(by Operator)
No (Wait)
Yes
GT2 Ready for Synchronization at GT2
TCP
Send GT2 “START” signal to GT2 TCP
No (Wait)
GT2 Automatic Generation Control MANUAL
GT2 GCB “AUTO SYNCHRO” Selected
No
MANUAL SYNCHRO at GT2 TCP
(by Operator)
Yes
GT2 Synchronized and loaded to SRLoad by GT2 TCP
Yes
A(009, A)Yes
GT2 Output > 10 MW
No (Wait)
B(006, A)Yes
GT2 TCP “REMOTE” Selected
No
Yes
GT2 Start
GT2 Synchronized
GT2 Ready to StartYes
C(016, B)
GT2 IDLE/RUN
No
D(016, H)
Yes(APS SU End)
Early opening of isolation bypass valves is better for
piping warming-up, especially in case of LAG start-up of HRSG2 located
far from ST.
For making APS control GT1
ENGS
OFT
A(008, A)
APS-FC-009, Rev. A
Dwg. No. APS-FC-009 / HRSG1 Temp Matching, Bypass Valve Set-up, Isolation Valve Open
< Temperature Matching for HRSG1 >Send the following signal to GT1 TCP :
“EXHAUST TEMP MATCH REFERENCE = 400 oC“EXHAUST TEMP MATCH RAMP RATE” = 1.1 oC/min.(Max.)EXHAUST TEMP MATCH CONTROL ON
Gt1 Exhaust Gas Temp < 410 oC ANDCondenser Press < 10 inch Hg abs. ANDHRSG1 HP Drum Press > 0.7 atg
No (Wait)
Yes
Put HRSG1 HP Bypass Valve into CAS Control as follows :
HP Bypass Valve MANUAL/OPEN to 10% Opening
HP Bypass Valve AUTO/SET PRESSURE CHANGE FROM CURRENT PRESSURE TO 50 atg (10% Minimum Opening) not to exceed the following limit
- HP Drum Temp Change Rate < 3.9 oC/min.- (-) 50 mm > HP Drum Level > (-) 350 mm
HP Bypass Valve CAS/(Set at 50 atg)
HRSG1 HP Press > 30 atg ANDHRSG1 HP Bypass Valve Opening > 9%
Put HRSG1 HP Bypass Spray Valve into CAS Control as follows :
HP Bypass Spray Isolation Valve AUTO/OPEN HP Bypass Spray Valve CAS/(Set at 360 oC)(See Note 2.)
Yes
No (Wait)
Gt1 Exhaust Gas Temp < 410 oC ANDCondenser Press < 10 inch Hg abs. ANDHRSG1 HRH Press > 0.7 atg ANDHRSG1 HRH Bypass Valve Body Temp O.K. (> CRH Sat. Temp)
No (Wait)
Yes
Put HRSG1 HRH Bypass Valve into CAS Control as follows :
HRH Bypass Valve MANUAL/OPEN to 10% Opening
HRH Bypass Valve AUTO/SET PRESSURE CHANGE FROM CURRENT PRESSURE TO 6.5 atg (10% Minimum Opening) not to exceed the following limit
- IP Drum Temp Change Rate < 10 oC/min.- (-) 50 mm > IP Drum Level > (-) 350 mm
HRH Bypass Valve CAS/(Set at 6.5 atg)
HRSG1 HRH Press > 6 atg ANDHRSG1 HRH Bypass Valve Opening > 13%
Put HRSG1 HRH Bypass Spray Valve into CAS Control as follows :
HRH Bypass Spray Isolation Valve AUTO/OPEN HRH Bypass Spray Valve CAS/(675 kcal/kg Enthalpy Control) (See Note 3.)
Yes
Yes
No (Wait)
HRSG1 HRH Press> 0.7 atg
GT1 Output > 10 MW
GT1 LEAD
Yes
Open HRSG1 isolation valves in the following order :
HRH Isolation Valve AUTO/OPENCRH Isolation Valve AUTO/OPENHP Isolation Valve AUTO/OPEN
Close HRSG1 isolation bypass valves as follows :
CRH Isolation Bypass Valve AUTO/CLOSE on CRH Isolation Valve CloseHP Isolation Bypass Valve AUTO/CLOSE on HP Isolation Valve Close
Yes
HRSG1 LP Drum Press> 0.7 atg
HRSG1 LP Isolation valve AUTO/OPEN
HRSG1 LP Isolation Bypass Valve AUTO/CLOSE on LP Isolation Valve Close
Yes
Yes
Condition for minimum volume flow of effective
spray, 0.72 m3/hr(See Note 1.)
Condition for minimum volume flow of effective
spray, 2.8 m3/hr(See Note 1.)
No(GT1 LAG)
B(010, A)
ST HP/CRH/HRHPiping Drain
C(010, B)
No (Wait) No (Wait)
Note 1 :The condition has been calculated based on nozzle flow equation.
Note 2 :The higher the cold reheat temperature is, the better the HP steam control is in view of HP steam high temperature problem.
Note 3 :The enthalpy has been selected considering condenser dome spray water flow.
E(011, A)
Reheat FlowEstablishment
F(011, B)
Reheat FlowEstablishment
G(011, C)
ST Start-upPermissive
H(011, D)
Reheat FlowEstablishment
Put HRSG1 LP Econ Bypass Valve CAS/SET at 4.0 kg/cm2g
HRSG1 LP Drum Press> 0.7 atg
Yes
No(Wait)
I(013, A)
J(013, B)
Temp Match for HRSG1
HRSG1 HP Bypass Spray
CAS
HRSG1 HP Bypass CAS
HRSG1 HRH Bypass CAS
HRSG1 HRH Bypass Spray
CAS
HRSG1 LP Econ Bypass
CAS
K(011, G)
Reheat FlowEstablishment
ENGS
OFT
APS-FC-109, Rev. A
Dwg. No. APS-FC-109 / HRSG2 Temp Matching, Bypass Valve Set-up, Isolation Valve Open (Same with HRSG1)
A(108, A)
< Temperature Matching for HRSG2 >Send the following signal to GT2 TCP :
“EXHAUST TEMP MATCH REFERENCE = 400 oC“EXHAUST TEMP MATCH RAMP RATE” = 1.1 oC/min.(Max.)EXHAUST TEMP MATCH CONTROL ON
Gt2 Exhaust Gas Temp < 410 oC ANDCondenser Press < 10 inch Hg abs. ANDHRSG2 HP Drum Press > 0.7 atg
No (Wait)
Yes
Put HRSG2 HP Bypass Valve into CAS Control as follows :
HP Bypass Valve MANUAL/OPEN to 10% Opening
HP Bypass Valve AUTO/SET PRESSURE CHANGE FROM CURRENT PRESSURE TO 50 atg (10% Minimum Opening) not to exceed the following limit
- HP Drum Temp Change Rate < 3.9 oC/min.- (-) 50 mm > HP Drum Level > (-) 350 mm
HP Bypass Valve CAS/(Set at 50 atg)
HRSG2 HP Press > 30 atg ANDHRSG2 HP Bypass Valve Opening > 13%
Put HRSG2 HP Bypass Spray Valve into CAS Control as follows :
HP Bypass Spray Isolation Valve AUTO/OPEN HP Bypass Spray Valve CAS/(Set at 360 oC)(See Note 2.)
Yes
Yes
No (Wait)
Gt2 Exhaust Gas Temp < 410 oC ANDCondenser Press < 10 inch Hg abs. ANDHRSG2 HRH Press > 0.7 atg ANDHRSG2 HRH Bypass Valve Body Temp O.K. (> CRH Sat. Temp)
No (Wait)
Yes
Put HRSG2 HRH Bypass Valve into CAS Control as follows :
HRH Bypass Valve MANUAL/OPEN to 10% Opening
HRH Bypass Valve AUTO/SET PRESSURE CHANGE FROM CURRENT PRESSURE TO 6.5 atg (10% Minimum Opening) not to exceed the following limit
- IP Drum Temp Change Rate < 10 oC/min.- (-) 50 mm > IP Drum Level > (-) 350 mm
HRH Bypass Valve CAS/(Set at 6.5 atg)
HRSG2 HRH Press > 6 atg ANDHRSG2 HRH Bypass Valve Opening > 13%
Put HRSG2 HRH Bypass Spray Valve into CAS Control as follows :
HRH Bypass Spray Isolation Valve AUTO/OPEN HRH Bypass Spray Valve CAS/(675 kcal/kg Enthalpy Control) (See Note 3.)
Yes
Yes
No (Wait)
HRSG2 HRH Press> 0.7 atg
GT2 Output > 10 MW
GT2 LEAD
Yes
Open HRSG2 isolation valves in the following order :
HRH Isolation Valve AUTO/OPENCRH Isolation Valve AUTO/OPENHP Isolation Valve AUTO/OPEN
Close HRSG2 isolation bypass valves as follows :
CRH Isolation Bypass Valve AUTO/CLOSE on CRH Isolation Valve CloseHP Isolation Bypass Valve AUTO/CLOSE on HP Isolation Valve Close
Yes
HRSG2 LP Drum Press> 0.7 atg
HRSG2 LP Isolation valve AUTO/OPEN
HRSG2 LP Isolation Bypass Valve AUTO/CLOSE on LP Isolation Valve Close
Yes
Yes
Condition for minimum volume flow of effective
spray, 0.72 m3/hr(See Note 1.)
Condition for minimum volume flow of effective
spray, 2.8 m3/hr(See Note 1.)
No(GT2 LAG)
B(110, A)
ST HP/CRH/HRHPiping Drain
C(110, B)
No (Wait) No (Wait)
Note 1 :The condition has been calculated based on nozzle flow equation.
Note 2 :The higher the cold reheat temperature is, the better the HP steam control is in view of HP steam high temperature problem.
Note 3 :The enthalpy has been selected considering condenser dome spray water flow.
E(111, A)
Reheat FlowEstablishment
F(111, B)
Reheat FlowEstablishment
G(111, C)
ST Start-upPermissive
H(111, D)
Reheat FlowEstablishment
Put HRSG2 LP Econ Bypass Valve CAS/SET at 4.0 kg/cm2g
HRSG2 LP Drum Press> 0.7 atg
Yes
No(Wait)
I(113, A)
J(113, B)
Temp Match for HRSG2
HRSG2 HP Bypass Spray
CAS
HRSG2 HP Bypass CAS
HRSG1 HRH Bypass CAS
HRSG2 HRH Bypass Spray
CAS
HRSG2 LP Econ Bypass
CAS
K(111, G)
Reheat FlowEstablishment
ENGS
OFT
APS-FC-010, Rev. A
Dwg. No. APS-FC-010 / ST Piping Drain Operation by LEAD HRSG1
A(009, B)
B(009, C)
HRSG1 HRH Isolation Valve Fully Open ANDHRSG1 CRH Isolation Valve Fully Open
HRSG1 HP IsolationValve Fully Open
HRSG1 LP IsolationValve Fully Open
HRSG1 HRH/CRH/HPIsolation Valves OPEN
HRSG1 LPIsolation Valve OPEN
C(006, C)
Yes(Upstream Drain
Valve AUTO)
D(006, B)
Yes(Upstream Drain
Valve AUTO)
E(006, D)
Yes(Upstream Drain
Valve AUTO)
Block AUTO operation and then open ST RH piping drain valves (See Note 2.):
XV1013 MANUAL/OPENXV1018 MANUAL/OPENXV1031 MANUAL/OPENST CRV Seat Drain Valves AUTO/OPEN
Yes
5 min. elapsed ANDCRH Press > 3.5 atg
Put drain valves in AUTO operation :
XV1013 AUTO/(Close)
Put drain valves in AUTO operation :
XV1018 AUTO/(Close)XV1031 AUTO/(Close)
ST IPCControl ON
F(012, C)
Yes
Note 1 :XV1008 : Auto drain valve(A) just upstream of ST CMVXV1009 : Auto drain valve(B) just upstream of ST CMV
Note 2 :XV1013 : Auto drain valve in ST CRH pipingXV1018 : Auto drain valve(A) just upstream of ST CRVXV1031 : Auto drain valve(B) just upstream of ST CRV
* Capacities of XV1018 and XV1031 are very important for satisfying reheat steam temperature for ST start-up within reasonable time. If not sufficient, start-up time will be long.
Note 3 :XV1032 : Auto drain valve just upstream of ST LP-CV
ST Output> 10% MCR
ST CRV Seat Drain Valves AUTO/(Close)by ST TCS
Yes
No (Wait) No (Wait) No (Wait)
No (Wait)
No (Wait)
Block AUTO operation and then open ST HP piping drain valves (See Note 1.):
XV1008 MANUAL/OPENXV1009 MANUAL/OPENST CMV Seat Drain Valves AUTO/OPEN
5 min. elapsed ANDST IPC Control ON
Put drain valves in AUTO operation :
XV1008 AUTO/(Close)XV1009 AUTO/(Close)
Yes
ST Output> 10% MCR
ST CMV Seat Drain Valves AUTO/(Close)by ST TCS
Yes
No (Wait)
No (Wait)
Yes
Block AUTO operation and then open ST LP piping drain valves (See Note 3.):
XV1032 MANUAL/OPEN
5 min. elapsed ANDST LP-CV Control ON
Put drain valves in AUTO operation :
XV1032 AUTO/(Close)
Yes
No (Wait)
G(013, D)
ST LPCVControl ON
Yes
HRSG1 Isolation
Valves Open
Yes
HRSG1 LP Isolation
Valve Open
Yes
ENGS
OFT
APS-FC-110, Rev. A
Dwg. No. APS-FC-110 / ST Piping Drain Operation by LEAD HRSG2 (Same with HRSG1)
A(109, B)
B(109, C)
HRSG2 HRH Isolation Valve Fully Open ANDHRSG2 CRH Isolation Valve Fully Open
HRSG2 HP IsolationValve Fully Open
HRSG2 LP IsolationValve Fully Open
HRSG2 HRH/CRH/HPIsolation Valves OPEN
HRSG2 LPIsolation Valve OPEN
C(106, C)
Yes(Upstream Drain
Valve AUTO)
D(106, B)
Yes(Upstream Drain
Valve AUTO)
E(106, D)
Yes(Upstream Drain
Valve AUTO)
Block AUTO operation and then open ST RH piping drain valves (See Note 2.):
XV1013 MANUAL/OPENXV1018 MANUAL/OPENXV1031 MANUAL/OPENST CRV Seat Drain Valves AUTO/OPEN
Yes
5 min. elapsed ANDCRH Press > 3.5 atg
Put drain valves in AUTO operation :
XV1013 AUTO/(Close)
Put drain valves in AUTO operation :
XV1018 AUTO/(Close)XV1031 AUTO/(Close)
ST IPCControl ON
F(112, C)
Yes
Note 1 :XV1008 : Auto drain valve(A) just upstream of ST CMVXV1009 : Auto drain valve(B) just upstream of ST CMV
Note 2 :XV1013 : Auto drain valve in ST CRH pipingXV1018 : Auto drain valve(A) just upstream of ST CRVXV1031 : Auto drain valve(B) just upstream of ST CRV
* Capacities of XV1018 and XV1031 are very important for satisfying reheat steam temperature for ST start-up within reasonable time. If not sufficient, start-up time will be long.
Note 3 :XV1032 : Auto drain valve just upstream of ST LP-CV
ST Output> 10% MCR
ST CRV Seat Drain Valves AUTO/(Close)by ST TCS
Yes
No (Wait) No (Wait) No (Wait)
No (Wait)
No (Wait)
Block AUTO operation and then open ST HP piping drain valves (See Note 1.):
XV1008 MANUAL/OPENXV1009 MANUAL/OPENST CMV Seat Drain Valves AUTO/OPEN
5 min. elapsed ANDST IPC Control ON
Put drain valves in AUTO operation :
XV1008 AUTO/(Close)XV1009 AUTO/(Close)
Yes
ST Output> 10% MCR
ST CMV Seat Drain Valves AUTO/(Close)by ST TCS
Yes
No (Wait)
No (Wait)
Yes
Block AUTO operation and then open ST LP piping drain valves (See Note 3.):
XV1032 MANUAL/OPEN
5 min. elapsed ANDST LP-CV Control ON
Put drain valves in AUTO operation :
XV1032 AUTO/(Close)
Yes
No (Wait)
G(113, D)
ST LPCVControl ON
Yes
HRSG2 Isolation
Valves Open
Yes
HRSG2 LP Isolation
Valve Open
Yes
ENGS
OFT
APS-FC-011, Rev. A
Dwg. No. APS-FC-011 / ST Start-up by LEAD HRSG1
HRSG1 HP Start-up Vent Valve Close ANDHRSG1 HP Steam Flow > 40 ton/hr ANDHRSG1 HP and HRH Bypass Spray Valve in CAS ANDHRSG1 HP and HRH Bypass Valve in CAS
< Temperature Matching for ST >Send the following signal to GT1 TCP :
“EXHAUST TEMP MATCH REFERENCE” = “GT TEMP MATCHING CONTROL SET POINT” from ST TCS plus 3 oC
Reheat flow is established AND HP bypass temp control ON
AND HRH bypass control ON
Since GT is still in “EXHAUST TEMPERATURE MATCH CNTL
ON” mode, merely change of “EXHAUST TEMP MATCH
REFERENCE” enforces GT to perform temperature matching
Yes
N0(Wait)
A(009, E)
HRSG1 HP BypassSpray Valve in CAS
B(009, F)
HRSG1 HRH BypassValve in CAS
ST RESET for Trip
ST RESETCompleted No
Clear ST Trip Conditions
(by Operator)
ST START(CB)
Send “ST PERMISSIVE CONDITION FROM HRSG BOP SIDE” signal to ST TCS
ST “READY TO START” signal from ST TCS Received
Turn on ST “REMOTE”at ST TCS
(by Operator)
No (Wait)
Yes
ST Ready for Synchronization at ST
TCS
Send ST “START” signal to ST TCS
No (Wait)
ST GCB “AUTO SYNCHRO” Selected
No
MANUAL SYNCHRO at ST TCS
(by Operator)
Yes
ST Synchronized and Loaded to Minimum Loadby ST TCS
Yes
ST Output > 3 MW
No (Wait)
ST Start-up Permissive Conditions Check as below :
HRSG1 HRH HP/CRH/HRH Isolation Valves Open ANDCondenser Pressure < 4 inch Hg abs.
Yes
ST Start-up Permissive Conditions OK
No(Wait)
HRSG1 Steam Quality OK (CB)
Yes
Yes
HRSG HP and HRH steam temperature check is not required, because ST will
check for itself. (See Note 1.)
C(009, G)
HRSG1 HP/CRH/HRHIsolation Valves OPEN
D(009, H)
HRSG1 HP BypassValve in CAS
ST START
ST AUTO SYNCH
Yes
ST TCS “REMOTE”Selected
No
Yes
ST READY TO START
Yes
ST SYNCHR-ONIZED
Yes
E(012, A)
Yes
HRSG1 RH Flow Established Yes
GT1 LEAD
Yes
No(GT1 LAG)
F(012, D)
HRSG1 Steam Quality OK
Temp Match for ST
G(009, K)
HRSG1 HRH BypassSpray Valve in CAS
Note 1 :HRSG HP and HRH steam minimum temperature required by ST should be satisfied for ST start-up, and these minimum temperature should be met by steam evacuation through drain valves just upstream of ST inlet. The drain valve sizing should be large enough to achieve the minimum temperature within guarantee CCPP start-up time.
ENGS
OFT
APS-FC-111, Rev. A
Dwg. No. APS-FC-111 / ST Start-up by LEAD HRSG2 (Same with HRSG1)
HRSG2 HP Start-up Vent Valve Close ANDHRSG2 HP Steam Flow > 40 ton/hr ANDHRSG2 HP and HRH Bypass Spray Valve in CAS ANDHRSG2 HP and HRH Bypass Valve in CAS
< Temperature Matching for ST >Send the following signal to GT2 TCP :
“EXHAUST TEMP MATCH REFERENCE” = “GT TEMP MATCHING CONTROL SET POINT” from ST TCS plus 3 oC
Reheat flow is established AND HP bypass temp control ON
AND HRH bypass control ON
Since GT is still in “EXHAUST TEMPERATURE MATCH CNTL
ON” mode, merely change of “EXHAUST TEMP MATCH
REFERENCE” enforces GT to perform temperature matching
Yes
N0(Wait)
A(109, E)
HRSG2 HP BypassSpray Valve in CAS
B(109, F)
HRSG2 HRH BypassValve in CAS
ST RESET for Trip
ST RESETCompleted No
Clear ST Trip Conditions
(by Operator)
ST START(CB)
Send “ST PERMISSIVE CONDITION FROM HRSG BOP SIDE” signal to ST TCS
ST “READY TO START” signal from ST TCS Received
Turn on ST “REMOTE”at ST TCS
(by Operator)
No (Wait)
Yes
ST Ready for Synchronization at ST
TCS
Send ST “START” signal to ST TCS
No (Wait)
ST GCB “AUTO SYNCHRO” Selected
No
MANUAL SYNCHRO at ST TCS
(by Operator)
Yes
ST Synchronized and Loaded to Minimum Loadby ST TCS
Yes
ST Output > 3 MW
No (Wait)
ST Start-up Permissive Conditions Check as below :
HRSG2 HRH HP/CRH/HRH Isolation Valves Open ANDCondenser Pressure < 4 inch Hg abs.
Yes
ST Start-up Permissive Conditions OK
No(Wait)
HRSG2 Steam Quality OK (CB)
Yes
Yes
HRSG HP and HRH steam temperature check is not required, because ST will
check for itself. (See Note 1.)
C(109, G)
HRSG2 HP/CRH/HRHIsolation Valves OPEN
D(109, H)
HRSG2 HP BypassValve in CAS
ST START
ST AUTO SYNCH
Yes
ST TCS “REMOTE”Selected
No
Yes
ST READY TO START
Yes
ST SYNCHR-ONIZED
Yes
E(112, A)
Yes
HRSG2 RH Flow Established Yes
GT2 LEAD
Yes
No(GT2 LAG)
F(112, D)
HRSG2 Steam Quality OK
Temp Match for ST
G(109, K)
HRSG2 HRH BypassSpray Valve in CAS
Note 1 :HRSG HP and HRH steam minimum temperature required by ST should be satisfied for ST start-up, and these minimum temperature should be met by steam evacuation through drain valves just upstream of ST inlet. The drain valve sizing should be large enough to achieve the minimum temperature within guarantee CCPP start-up time.
ENGS
OFT
APS-FC-012, Rev. A
Dwg. No. APS-FC-012 / LEAD GT1 Ramp-up to 50% Load(100 MW)
A(011, E)
ST TCS performs the following :
Heat Soaking at Minimum LoadICV to CV TransferIPC ON.
ST at Minimum Load
ST “IPC ON” No(Wait)
HRSG1 HRH Bypass Valve CLOSE by Floating Its Set Pressure to Current Pressure plus 2 kg/cm2
Yes
HRSG1 HRH Bypass Valve Full Close
No(Wait)
HRSG1 HP Bypass Valve CLOSE by Floating Its Set Pressure to Current Pressure plus 3 kg/cm2
Yes
ST IPC ON Yes
HRSG1 HRH Bypass
Valve CloseYes
HRSG1 HP Bypass Valve Full Close
HRSG1 HP Bypass
Valve CloseYes
< GT1 Load Ramping-up by Temperature Matching >Send the following signal to GT1 TCP :
“EXHAUST TEMP MATCH RAMP RATE” =Limit Value from ST TCS (2.5 oC/min)“EXHAUST TEMP MATCH REFERENCE” = 575 oC
Yes
Since GT is still in “EXHAUST TEMPERATURE MATCH CNTL
ON” mode, merely change of “EXHAUST TEMP MATCH
REFERENCE” enforces GT to perform temperature matching
HRSG1 HP Steam Temperature > 555 oC
No(Wait)
< GT1 Load Ramping-up by External Load Control >Send the following signal to GT1 TCP :
EXTERNAL LOAD SET = 101 MWEXHAUST TEMP MATCH CONTROL OFFEXTERNAL LOAD CONTROL ON
GT load ramping-up by load control is no good for steam temperature
ramping rate control.Ramping-up by temperature
matching is better.
GT1 Load Up by Temp Match
Yes
GT1 Load Up by Load Control
HRSG1 HP Drum Temp Change Rate < Limit Vale ANDHRSG1 HP Steam Temp < 570 oC ANDHRSG1 HRH Steam Temp < 570 oC ANDST Load NOT Limited
GT1 LOADING RATE SET = Limit Value from ST TCS multiplied by 2.67
Yes
GT1 LOADING RATE SET = 0
No
GT1 Output >= 100 MW
GT1 Output 100MWYes
No(GT1 LAG)
B(013, C) Yes
C(010, F) Yes
In 2-2-1 CCPP, 2.67% output increase of one
GT results in 1% increase of ST output.
“ST Load NOT Limited”condition may not be
required, if ST controls over-loading for itself.
D(011, F) GT1 LAG
GT1 LOADING RATE SET = 8 MW/min.
GT1 LEAD
Yes
No(GT1 LAG)
For HRSGs stable operation, a half of maximum rate is
selected
No(Repeat)
F(014, A)
HRSG1 Steam Quality OK (CB)
HRSG1 Steam Quality OK
GT1 LEAD
Yes
Yes
ST is capable of accepting high flow steam in IPC On mode without any trouble. Therefore, bypass valve closing on ST IPC ON by
floating set pressure is OK.
ENGS
OFT
APS-FC-112, Rev. A
Dwg. No. APS-FC-112 / LEAD GT2 Ramp-up to 50% Load(100 MW) (Same with GT1)
A(111, E)
ST TCS performs the following :
Heat Soaking at Minimum LoadICV to CV TransferIPC ON.
ST at Minimum Load
ST “IPC ON” No(Wait)
HRSG2 HRH Bypass Valve CLOSE by Floating Its Set Pressure to Current Pressure plus 2 kg/cm2
Yes
HRSG2 HRH Bypass Valve Full Close
No(Wait)
HRSG2 HP Bypass Valve CLOSE by Floating Its Set Pressure to Current Pressure plus 3 kg/cm2
Yes
ST IPC ON Yes
HRSG2 HRH Bypass
Valve CloseYes
HRSG1 HP Bypass Valve Full Close
HRSG2 HP Bypass
Valve CloseYes
< GT2 Load Ramping-up by Temperature Matching >Send the following signal to GT2 TCP :
“EXHAUST TEMP MATCH RAMP RATE” =Limit Value from ST TCS (2.5 oC/min)“EXHAUST TEMP MATCH REFERENCE” = 575 oC
Yes
Since GT is still in “EXHAUST TEMPERATURE MATCH CNTL
ON” mode, merely change of “EXHAUST TEMP MATCH
REFERENCE” enforces GT to perform temperature matching
HRSG2 HP Steam Temperature > 555 oC
No(Wait)
< GT2 Load Ramping-up by External Load Control >Send the following signal to GT2 TCP :
EXTERNAL LOAD SET = 101 MWEXHAUST TEMP MATCH CONTROL OFFEXTERNAL LOAD CONTROL ON
GT load ramping-up by load control is no good for steam temperature
ramping rate control.Ramping-up by temperature
matching is better.
GT2 Load Up by Temp Match
Yes
GT2 Load Up by Load Control
HRSG2 HP Drum Temp Change Rate < Limit Vale ANDHRSG2 HP Steam Temp < 570 oC ANDHRSG2 HRH Steam Temp < 570 oC ANDST Load NOT Limited
GT2 LOADING RATE SET = Limit Value from ST TCS multiplied by 2.67
Yes
GT2 LOADING RATE SET = 0
No
GT2 Output >= 100 MW
GT2 Output 100MWYes
No(GT2 LAG)
B(113, C) Yes
C(110, F) Yes
In 2-2-1 CCPP, 2.67% output increase of one
GT results in 1% increase of ST output.
“ST Load NOT Limited”condition may not be
required, if ST controls over-loading for itself.
D(111, F) GT2 LAG
GT2 LOADING RATE SET = 8 MW/min.
GT2 LEAD
Yes
No(GT2 LAG)
For HRSGs stable operation, a half of maximum rate is
selected
No(Repeat)
F(114, A)
HRSG2 Steam Quality OK (CB)
HRSG2 Steam Quality OK
GT2 LEAD
Yes
Yes
ST is capable of accepting high flow steam in IPC On mode without any trouble. Therefore, bypass valve closing on ST IPC ON by
floating set pressure is OK.
ENGS
OFT
APS-FC-013, Rev. A
Dwg. No. APS-FC-013 / LEAD & LAG HRSG1 LP Addition to ST
A(009, I)
HRSG1 LP IsoValve OPEN
Yes
No(Wait)
C(012, B)
ST TCS puts LPCV Control On if the following conditions are satisfied :
ST IPC ONST Output > 35% MCRHRSG1 LP Steam Press > 1.1 kg/cm2gHRSG1 LP Steam Superheat Degree > 28 oC
ST IPC ON
ST LPCV Control ON
No (Wait)
HRSG1 LP Start-up Vent Valve CLOSE not to exceed the following limit
- (-) 50 mm > LP Drum Level > (-) 350 mm
Yes
ST LPCV Control ON Yes
B(009, J)
HRSG1 LP EconBypass CAS
HRSG1 LP Econ Bypass Valve CAS ANDHRSG1 LP Isolation Valve Open
HRSG1 LP Start-up Vent Valve Fully Closed
HRSG1 LP Econ Bypass Valve CAS/SET at 7.6 kg/cm2gHRSG1 LP Start-up Vent Valve CAS/SET at 8 kg/cm2g
Yes
No(Wait)
Note 1 :HRSG LP steam is generated by setting LP Econ Bypass Valve at 7.6 kg/cm2g.By the setting, HRSG LP steam generation is suppressed if LP steam pressure is higher than 7.6 kg/cm2g.
If HRSG LP steam pressure is higher than 8 kg/cm2g, LP start-up vent valve shall be open.
D(010, F) Yes
GT1 LEADYes
LP Steam Temp Difference between HRSG1 and HRSG2 < 50 oC
No(GT1 LAG)
HRSG1 LP Econ Bypass Valve Set Pressure SET at HRSG2 LP Drum Steam Pressure
Yes
No(Wait)
LP Steam Press Difference between HRSG1 and HRSG2 < 1 kg/cm2
Yes
No(Wait)
HRSG1 LP Isolation Valve AUTO/OPEN
HRSG1 LP Isolation Bypass Valve AUTO/CLOSE on LP Isolation Valve Close
ST LPCV Control ON ANDHRSG1 LP Isolation Valve Open
Yes
Yes
No(Wait)
E(016, E) APS SU End
HRSG1 LP Isolation
Valve Open
HRSG1 LP Addition to ST
Complete
ENGS
OFT
APS-FC-113, Rev. A
Dwg. No. APS-FC-113 / LEAD & LAG HRSG2 LP Addition to ST (Same with HRSG1)
A(109, I)
HRSG2 LP IsoValve OPEN
Yes
No(Wait)
C(112, B)
ST TCS puts LPCV Control On if the following conditions are satisfied :
ST IPC ONST Output > 35% MCRHRSG2 LP Steam Press > 1.1 kg/cm2gHRSG2 LP Steam Superheat Degree > 28 oC
ST IPC ON
ST LPCV Control ON
No (Wait)
HRSG2 LP Start-up Vent Valve CLOSE not to exceed the following limit
- (-) 50 mm > LP Drum Level > (-) 350 mm
Yes
ST LPCV Control ON Yes
B(109, J)
HRSG2 LP EconBypass CAS
HRSG2 LP Econ Bypass Valve CAS ANDHRSG2 LP Isolation Valve Open
HRSG2 LP Start-up Vent Valve Fully Closed
HRSG2 LP Econ Bypass Valve CAS/SET at 7.6 kg/cm2gHRSG2 LP Start-up Vent Valve CAS/SET at 8 kg/cm2g
Yes
No(Wait)
Note 1 :HRSG LP steam is generated by setting LP Econ Bypass Valve at 7.6 kg/cm2g.By the setting, HRSG LP steam generation is suppressed if LP steam pressure is higher than 7.6 kg/cm2g.
If HRSG LP steam pressure is higher than 8 kg/cm2g, LP start-up vent valve shall be open.
D(110, F) Yes
GT2 LEADYes
LP Steam Temp Difference between HRSG1 and HRSG2 < 50 oC
No(GT2 LAG)
HRSG2 LP Econ Bypass Valve Set Pressure SET at HRSG1 LP Drum Steam Pressure
Yes
No(Wait)
LP Steam Press Difference between HRSG1 and HRSG2 < 1 kg/cm2
Yes
No(Wait)
HRSG2 LP Isolation Valve AUTO/OPEN
HRSG2 LP Isolation Bypass Valve AUTO/CLOSE on LP Isolation Valve Close
ST LPCV Control ON ANDHRSG2 LP Isolation Valve Open
Yes
Yes
No(Wait)
E(016, K) APS SU End
HRSG2 LP Isolation
Valve Open
HRSG2 LP Addition to ST
Complete
ENGS
OFT
APS-FC-014, Rev. A
Dwg. No. APS-FC-014 / LAG HRSG1 HP Addition to ST
A(012, F)
GT1 100 MW ANDHRSG1 Steam Quality OK
HRSG1 Isolation Valves OPEN in the Following Order :
HRH Isolation Valve OPENCRH Isolation Valve OPENHP Isolation Valve OPEN
HRSG1 Isolation
Valves OpenYes
HRSG1 HP Isolation Valve Open
No(Wait)
HRSG1 HRH Bypass Valve CAS/SET at “HRH BYPASS PRESS CONTROL SET POINT” from STG TCS
This SET makes HRH bypass valve follow ST
natural pressure.Therefore, HRH bypass
valve automatically closes as HP bypass valve is forced to
close.
Yes
30 seconds Elapsed No(Wait)
HRSG1 HP Bypass Valve FORCED TO CLOSE not to exceed the following limit
HRSG1 HP Drum Temp Change Rate < Limit Vale ANDHRSG1 HP Steam Temp < 565 oC ANDHRSG1 HRH Steam Temp < 565 oC ANDHP Steam Pressure Difference between HRSG1 and HRSG2 < 20 kg/cm2 AND (See Note 2.)ST Load NOT Limited
Yes
“ST Load NOT Limited”condition may not be
required, if ST controls over-loading for itself.
HP Bypass Valve Opening < 10%
HRSG1 HP Bypass Valve FORCED TO FULL CLOSE
Yes
No(Wait)
HRH Bypass ValveOpening < 10%
HP Bypass ValveFully Closed
Float HRSG1 HP Bypass Valve Set Pressure at 3 kg/cm2 above HRSG1 HP Steam Pressure
Yes
Maximum set pressure shall be limited above maximum operating pressure, but less than HRSG SH safety valve
set pressure.
No(Wait)
Yes
Yes
HRSG1 HRH Bypass Valve FORCED TO FULL CLOSE
Float HRSG1 HRH Bypass Valve Set Pressure at 2 kg/cm2 above HRSG1 HRH Steam Pressure
No(Wait)
Maximum set pressure shall be limited above maximum operating
pressure, but less than HRSG RH safety valve
set pressure.
HRH Bypass ValveFully Closed
Yes
No(Wait)
Yes
GT1 LEAD
No(GT1 LAG)
Note 1 :When LAG GT arrives at 100 MW, both GT’s shall start ramp-up to target load, and simultaneously LAG HRSG addition, i.e. opening of isolation valves, starts.
This makes start-up time short. If ST loading rate is over its allowable limit, ST throttles its control valves for itself.
GT1 Ready for Ramp-up
B(015, A)
(See Note 1.)
Yes
C(016, C)APS SU End
D(016, D)APS SU End
HRSG1 HP Addition to ST
Complete
Note 2 :When HRSG2 located far from ST starts as LAG, sometimes HRSG2 HP steam pressure is built up much above HRSG1 HP steam pressure due to HRSG2 HP steam check valve not fully open.If HRSG2 HP steam check valve is suddenly open with high differential pressure, ST trips due to high HP steam turbine differential expansion.
Therefore, the HP differential pressure between HRSG1 and HRSG2 should be monitored.
Both GT’s & HRSG’s Condition Match :
Output Difference between GT1 and GT2 < 3 MWHP Steam Pressure Difference between HRSG1 and HRSG2 < 5 kg/cm2HRH Steam Pressure Difference between HRSG1 and HRSG2 < 3.5 kg/cm2 HP and HRH Temperature Difference between HRSG1 and HRSG2 < 17 oC
Both GT’s & HRSG’s Condition Match OK
Yes
No(Wait)
ENGS
OFT
APS-FC-114, Rev. A
Dwg. No. APS-FC-114 / LAG HRSG2 HP Addition to ST (Same with HRSG1)
A(112, F)
GT2 100 MW ANDHRSG2 Steam Quality OK
HRSG2 Isolation Valves OPEN in the Following Order :
HRH Isolation Valve OPENCRH Isolation Valve OPENHP Isolation Valve OPEN
HRSG2 Isolation
Valves OpenYes
HRSG2 HP Isolation Valve Open
No(Wait)
HRSG2 HRH Bypass Valve CAS/SET at “HRH BYPASS PRESS CONTROL SET POINT” from STG TCS
This SET makes HRH bypass valve follow ST
natural pressure.Therefore, HRH bypass
valve automatically closes as HP bypass valve is forced to
close.
Yes
30 seconds Elapsed No(Wait)
HRSG2 HP Bypass Valve FORCED TO CLOSE not to exceed the following limit
HRSG2 HP Drum Temp Change Rate < Limit Vale ANDHRSG2 HP Steam Temp < 565 oC ANDHRSG2 HRH Steam Temp < 565 oC ANDHP Steam Pressure Difference between HRSG1 and HRSG2 < 20 kg/cm2 AND (See Note 2.)ST Load NOT Limited
Yes
“ST Load NOT Limited”condition may not be
required, if ST controls over-loading for itself.
HP Bypass Valve Opening < 10%
HRSG2 HP Bypass Valve FORCED TO FULL CLOSE
Yes
No(Wait)
HRH Bypass ValveOpening < 10%
HP Bypass ValveFully Closed
Float HRSG2 HP Bypass Valve Set Pressure at 3 kg/cm2 above HRSG2 HP Steam Pressure
Yes
Maximum set pressure shall be limited above maximum operating pressure, but less than HRSG SH safety valve
set pressure.
No(Wait)
Yes
Yes
HRSG2 HRH Bypass Valve FORCED TO FULL CLOSE
Float HRSG2 HRH Bypass Valve Set Pressure at 2 kg/cm2 above HRSG2 HRH Steam Pressure
No(Wait)
Maximum set pressure shall be limited above maximum operating
pressure, but less than HRSG RH safety valve
set pressure.
HRH Bypass ValveFully Closed
Yes
No(Wait)
Yes
GT2 LEAD
No(GT2 LAG)
Note 1 :When LAG GT arrives at 100 MW, both GT’s shall start ramp-up to target load, and simultaneously LAG HRSG addition, i.e. opening of isolation valves, starts.
This makes start-up time short. If ST loading rate is over its allowable limit, ST throttles its control valves for itself.
GT2 Ready for Ramp-up
Yes
C(016, I)APS SU End
D(016, J)APS SU End
HRSG2 HP Addition to ST
Complete
Note 2 :When HRSG2 located far from ST starts as LAG, sometimes HRSG2 HP steam pressure is built up much above HRSG1 HP steam pressure due to HRSG2 HP steam check valve not fully open.If HRSG2 HP steam check valve is suddenly open with high differential pressure, ST trips due to high HP steam turbine differential expansion.
Therefore, the HP differential pressure between HRSG1 and HRSG2 should be monitored.
B(015, B)
(See Note 1.)
Both GT’s & HRSG’s Condition Match :
Output Difference between GT1 and GT2 < 3 MWHP Steam Pressure Difference between HRSG1 and HRSG2 < 5 kg/cm2HRH Steam Pressure Difference between HRSG1 and HRSG2 < 3.5 kg/cm2 HP and HRH Temperature Difference between HRSG1 and HRSG2 < 17 oC
Both GT’s & HRSG’s Condition Match OK
Yes
No(Wait)
ENGS
OFT
APS-FC-015, Rev. A
Dwg. No. APS-FC-015 / Both GT s Ramp-up to Target Load
A(014, B)
Both GT’s Ready for Ramp-up
Yes
Both GT’s Ready for Ramp up Yes
B(114, B) GT2 Ready for Ramp-up
Gt1 Ready for Ramp-up
BASE LOAD TARGET
GT1 LOADING RATE SET = 17 MW/min.
GT maximum loading rate is 8.33%/min., but it should be
input by MW/min. unit.Since GT base load output at 15 oC ambient temperature is 170 MW, 17 MW/min. is
always higher than the maximum loading rate.
< Simultaneous GT1 and GT2 Ramping-up to Base Load >Send the following signal simultaneously to GT1 and GT2 TCP :
BASE
Yes
< Simultaneous GT1 and GT2 Ramping-up to Target Load by AGC (Automatic Generation Control) >
Transfer control to AGC, which ramps up GT1 and GT2 load to target load simultaneously.
No(CCPP
OUTPUTTARGET)
AGC ramps up and down CCPP load by using RAISE SPEED/LOAD or LOWER
SPEED/LOAD signal of GT TCP.
Yes(APS SU EndSee Note 1.)
Note 1 :Both GT’s ramp-up to target load need not to be controlled by APS, so that APS SU ends when both GT’s are ready for ramp-up for target load.
However, start-up time should be measured till both GT’s reach their target load.
C(016, F)
ENGS
OFT
APS-FC-016, Rev. A
Dwg. No. APS-FC-016 / APS SU Start & End
APS SUStart
HRSG1 & 2 Start-up Mode Selection(APS-FC-001)
Target Load Input & ST Start-up Mode Selection
(APS-FC-002)
GT(+ HRSG) SU Order Selection(APS-FC-003)
APS SU Start(CB)
A(008, C) GT1 & HRSG1 SU Start
B(108, C) GT2 & HRSG2 SU Start
APS SUEnd
C(014, C)
LAG HRSG1 HP BypassValve Fully Closed
D(014, D)
LAG HRSG1 HRH BypassValve Fully Closed
E(013, E)
LAG HRSG1 LP EconBypass Valve CAS
F(015, C)
Both GT’s Readyfor Ramp-up
APS SU Start
G(008, D)
GT1 IDLE/RUN
I(114, C)
LAG HRSG2 HP BypassValve Fully Closed
H(108, D)
GT2 IDLE/RUN
J(114, D)
LAG HRSG2 HRH BypassValve Fully Closed
K(113, E)
LAG HRSG2 LP EconBypass Valve CAS
ENGS
OFT
APS SD FC Drawing List
APS-FC-200, Rev. A :
APS-FC-201, Rev. A :
APS-FC-202, Rev. A :
Drawing List
GT(+ HRSG) SD Order Selection
APS SD Start & End
APS-FC-203, Rev. A :
APS-FC-303, Rev. A :
APS-FC-204, Rev. A :
APS-FC-304, Rev. A :
APS-FC-205, Rev. A :
APS-FC-305, Rev. A :
GT1 Load down to 100 MW and HRSG1 Bypass Valves Set-up
GT2 Load down to 100 MW and HRSG2 Bypass Valves Set-up (Same with HRSG1)
LEAD HRSG1 Isolation or ST Stop for LAG HRSG1
LEAD HRSG2 Isolation or ST Stop for LAG HRSG2(Same with HRSG1)
GT1 Stop and HRSG1 Bypass Valve Close
GT2 Stop and HRSG2 Bypass Valve Close (Same with HRSG1)
Dwg. No. Title
APS-FC-200, Rev. A
Dwg. No. APS-FC-200 / APS Shut-down Flow Chart Drawing List
ENGS
OFT
APS-FC-201, Rev. A
Dwg. No. APS-FC-201 / GT(+ HRSG) SD Order Selection
Train SD Order Selection Start
GT1 LEAD(CB)
GT1 LEAD
No
GT1 LAG(CB)
GT1 LAG
NoY
es
GT1 IDLE/RUN(CB)
GT1 IDLE/RUN
Yes(N/A)
Yes(N/A)
Train SD Order Selection End
GT2 LEAD GT2 LAG
GT2 LEAD(CB)
GT2 LEAD
No
GT2 LAG(CB)
GT2 LAG
No
Yes
GT2 IDLE/RUN(CB)
GT2 IDLE/RUN
Yes(N/A)
Yes(N/A)
GT1 LEAD GT1 LAGENGS
OFT
페이지 28
Dwg. No. APS-FC-201 / APS SD Start & End
APS SDStart
GT(+ HRSG) SD Order Selection(APS-FC-201)
APS SD Start(CB)
A(203, A)
GT1 & HRSG1SD Start
B(303, A) GT2 & HRSG2 SD Start
APS SDEnd
D(205, C)
HRSG1 HP BypassValve Fully Closed
E(205, D)
HRSG1 HRH BypassValve Fully Closed
APS SD Start
C(203, B)GT1 IDLE/RUN or N/A
G(305, C)
HRSG2 HP BypassValve Fully Closed
F(303, B)GT2 IDLE/RUN or N/A
H(305, D)
HRSG2 HRH BypassValve Fully Closed
ENGS
OFT
APS-FC-203, Rev. A
Dwg. No. APS-FC-203 / GT1 Load down to 100 MW and HRSG1 Bypass Valves Set-up
GT1 Automatic Generation Control MANUALFor making APS control GT1
A(202, A)
GT2 IDLE/RUN
GT1 & HRSG1SD Start
GT1 LAG
Yes(GT2 RUN)
Yes(N/A, APS SD End)
GT2 Synchronized
Yes
GT1 LEAD
No(GT2 IDLE)
Yes(N/A, APS SD End)
No
GT1 IDLE/RUN
No
B(202, C)
Yes(APS SD End)
No(GT1 LEAD
or LAG)
No
GT1 Output > 100 MW
< GT1 Load-down by External Load Control >Send the following signal to GT1 TCP :
EXTERNAL LOAD SET = 99 MWEXTERNAL LOAD CONTROL ON
GT1 Load Down by
Load Control
Yes
HRSG1 HP Drum Temp Change Rate < Limit Vale ANDHRSG1 HP Steam Temp < 570 oC ANDHRSG1 HRH Steam Temp < 570 oC ANDST Load NOT Limited ANDDifference between GT1 and GT2 Ouput < 5 MW
GT1 LOADING RATE SET = Limit Value from ST TCS multiplied by 1.33 (Two GT’s Load-down)
Yes
GT1 LOADING RATE SET = 0
No
GT1 Output <= 100 MW
GT1 Output 100MWYes
“ST Load NOT Limited”condition may not be
required, if ST controls over-loading for itself.
GT2 LEADOR LAG
No(GT2 IDLE/
Run)
No(Repeat)
Yes
GT1 LOADING RATE SET = Limit Value from ST TCS multiplied by 2.67 (One GT Load-down)
Yes
C(204, A)
Make HRSG1 HP and HRH Bypass Valves Ready for Operation as follows :
HP Bypass Spray Isolation Valve AUTO/OPEN HP Bypass Spray Valve CAS/(Set at 320 oC)HRH Bypass Spray Isolation Valve AUTO/OPEN HRH Bypass Spray Valve CAS/(675 kcal/kg Enthalpy Control)
HRH Bypass Valve CAS/SET at “HRH BYPASS PRESS CONTROL SET POINT” from STG TCS
This SET makes HRH bypass valve follow ST
natural pressure.Therefore, HRH bypass
valve automatically opens as HP bypass valve is forced to
open.
Yes
30 seconds elapsed
HRSG1 HRH Bypass Valve Preheat Valve AUTO
HRSG1 HRH Bypass Valve Body Temp O.K. (> CRH Sat. Temp)
No(Wait)
No(Wait)
Yes
No
ENGS
OFT
APS-FC-303, Rev. A
Dwg. No. APS-FC-303 / GT2 Load down to 100 MW and HRSG2 Bypass Valves Set-up(Same with HRSG1)
GT2 Automatic Generation Control MANUALFor making APS control GT2
A(202, B)
GT1 IDLE/RUN
GT2 & HRSG2SD Start
GT2 LAG
Yes(GT1 RUN)
Yes(N/A, APS SD End)
GT1 Synchronized
Yes
GT2 LEAD
No(GT1 IDLE)
Yes(N/A, APS SD End)
No
GT2 IDLE/RUN
No
B(202, F)
Yes(APS SD End)
No(GT2 LEAD
or LAG)
No
GT2 Output > 100 MW
< GT2 Load-down by External Load Control >Send the following signal to GT2 TCP :
EXTERNAL LOAD SET = 99 MWEXTERNAL LOAD CONTROL ON
GT2 Load Down by
Load Control
Yes
HRSG2 HP Drum Temp Change Rate < Limit Vale ANDHRSG2 HP Steam Temp < 570 oC ANDHRSG2 HRH Steam Temp < 570 oC ANDST Load NOT Limited ANDDifference between GT1 and GT2 Ouput < 5 MW
GT2 LOADING RATE SET = Limit Value from ST TCS multiplied by 1.33 (Two GT’s Load-down)
Yes
GT2 LOADING RATE SET = 0
No
GT2 Output <= 100 MW
GT2 Output 100MWYes
“ST Load NOT Limited”condition may not be
required, if ST controls over-loading for itself.
GT1 LEADOR LAG
No(GT1 IDLE/
Run)
No(Repeat)
Yes
GT2 LOADING RATE SET = Limit Value from ST TCS multiplied by 2.67 (One GT Load-down)
Yes
C(304, A)
Make HRSG2 HP and HRH Bypass Valves Ready for Operation as follows :
HP Bypass Spray Isolation Valve AUTO/OPEN HP Bypass Spray Valve CAS/(Set at 320 oC)HRH Bypass Spray Isolation Valve AUTO/OPEN HRH Bypass Spray Valve CAS/(675 kcal/kg Enthalpy Control)
HRH Bypass Valve CAS/SET at “HRH BYPASS PRESS CONTROL SET POINT” from STG TCS
This SET makes HRH bypass valve follow ST
natural pressure.Therefore, HRH bypass
valve automatically opens as HP bypass valve is forced to
open.
Yes
30 seconds elapsed
HRSG2 HRH Bypass Valve Preheat Valve AUTO
HRSG2 HRH Bypass Valve Body Temp O.K. (> CRH Sat. Temp)
No(Wait)
No(Wait)
Yes
No
ENGS
OFT
APS-FC-204, Rev. A
Dwg. No. APS-FC-204 / LEAD HRSG1 Isolation or ST Stop for LAG HRSG1
A(203, C)
GT1 100 MW andBypass Valves Set-up
Complete
HRSG1 HP Bypass Valve FORCED TO OPEN not to exceed the following limit :
HRSG1 HP Bypass Discharge Temp < 365 oC ANDHRSG1 HRH Bypass Discharge Temp < 250 oC ANDST Unload NOT Limited
Yes
“ST Load NOT Limited”condition is required,
because ST can not control over-unloading for itself..
Note 1 :HP bypass flow shall be calculated based on bypass valve opening, inlet pressure, inlet temperature, outlet pressure,and valve constant provided by bypass valve manufacturer.
GT1 LEAD
HRSG1 HP Steam Flow Measured is within HRSG1 HP Bypass Flow Calculated +/- 5%
(See Note 1.)
No(Repeat)
Lock HRSG1 HP Bypass Valve MANUAL / CURRENT OPENLock HRSG1 HRH Bypass Valve MANUAL / CURRENT OPEN
Yes
1 minute elapsed No(Wait)
Yes
HRSG1 Isolation Valves CLOSE in the Following Order :
HP Isolation Valve OPENCRH Isolation Valve OPENHRH Isolation Valve OPEN
Yes
HRSG1 HRH Isolation ValveFully Closed
No(Wait)
Yes
1 minute elapsed No(Wait)
Note 2 :Even though HRSG LP steam is not generated by this CAS SET, there is no reverse flow due to the stop/check valve in HRSG LP steam outlet piping.
HRSG1 LP Isolation Valve CLOSE
Yes
HRSG1 HP Bypass Valve CAS / SET at CURRENT PRESSUREHRSG1 HRH Bypass Valve CAS / SET at CURRENT PRESSURE
HRSG1 LP Econ Bypass Valve CAS / SET at 4.0 kg/cm2g (See Note 2.)
Yes(GT1 Stop)
B(205, A)
HRSG1 HP Bypass Valve CAS / SET at 53 kg/cm2g(See Remarks 8.)
No(GT1 LAG)
HRSG2 HP, CRH and HRH Isolation Valve
Fully Closed
No(Wait)
Yes
2 minutes elapsed(for bypass stabilization at 53
kg/cm2g)
No(Wait)
Sent the following signal to ST TCS for ST Shut-down :
ISOLATION OF NO. 1 TRAINST STOP
Yes
Upon receipt of ST STOP signal from DCS, ST TCS first performs ST LP-CV OFF; closes ST LP inlet pressure control valve: and then send ST LP-CV OFF signal to
DCS.
ST LP-CV OFFsignal received
No(Wait)
HRSG1 LP Econ Bypass Valve CAS / SET at 4.0 kg/cm2g
Yes
After sending ST LP-CV OFF signal to DCS, ST TCS performs the following job :
Decrease STG load to 25% load.Transfer from CV to ICV at 25% STG load.Decrease STG load to 5% load rapidly.Trip STG (GCB open)
Then, ST TCS sends ST NORMAL TRIP to DCS.
HRSG1 LP Isolation ValveFully Closed
No(Wait)
ST NORMAL TRIPsignal received
No(Wait)
C(205, B)
Yes(GT1 Stop)
HRSG1 HRH Bypass Valve CAS / SET at 6.5 kg/cm2g
ST Stop
LEAD HRSG1 Isolated
Yes
ENGS
OFT
APS-FC-304, Rev. A
Dwg. No. APS-FC-304 / LEAD HRSG2 Isolation or ST Stop for LAG HRSG2(Same with HRSG1)
A(303, C)
GT2 100 MW andBypass Valves Set-up
Complete
HRSG2 HP Bypass Valve FORCED TO OPEN not to exceed the following limit :
HRSG2 HP Bypass Discharge Temp < 365 oC ANDHRSG2 HRH Bypass Discharge Temp < 250 oC ANDST Unload NOT Limited
Yes
“ST Load NOT Limited”condition is required,
because ST can not control over-unloading for itself..
Note 1 :HP bypass flow shall be calculated based on bypass valve opening, inlet pressure, inlet temperature, outlet pressure,and valve constant provided by bypass valve manufacturer.
GT2 LEAD
HRSG2 HP Steam Flow Measured is within HRSG2 HP Bypass Flow Calculated +/- 5%
(See Note 1.)
No(Repeat)
Lock HRSG2 HP Bypass Valve MANUAL / CURRENT OPENLock HRSG2 HRH Bypass Valve MANUAL / CURRENT OPEN
Yes
1 minute elapsed No(Wait)
Yes
HRSG2 Isolation Valves CLOSE in the Following Order :
HP Isolation Valve OPENCRH Isolation Valve OPENHRH Isolation Valve OPEN
Yes
HRSG2 HRH Isolation ValveFully Closed
No(Wait)
Yes
1 minute elapsed No(Wait)
Note 2 :Even though HRSG LP steam is not generated by this CAS SET, there is no reverse flow due to the stop/check valve in HRSG LP steam outlet piping.
HRSG2 LP Isolation Valve CLOSE
Yes
HRSG2 HP Bypass Valve CAS / SET at CURRENT PRESSUREHRSG2 HRH Bypass Valve CAS / SET at CURRENT PRESSURE
HRSG2 LP Econ Bypass Valve CAS / SET at 4.0 kg/cm2g (See Note 2.)
Yes(GT2 Stop)
B(305, A)
HRSG2 HP Bypass Valve CAS / SET at 53 kg/cm2g(See Remarks 8.)
No(GT2 LAG)
HRSG1 HP, CRH and HRH Isolation Valve
Fully Closed
No(Wait)
Yes
2 minutes elapsed(for bypass stabilization at 53
kg/cm2g)
No(Wait)
Sent the following signal to ST TCS for ST Shut-down :
ISOLATION OF NO. 1 TRAINST STOP
Yes
Upon receipt of ST STOP signal from DCS, ST TCS first performs ST LP-CV OFF; closes ST LP inlet pressure control valve: and then send ST LP-CV OFF signal to
DCS.
ST LP-CV OFFsignal received
No(Wait)
HRSG2 LP Econ Bypass Valve CAS / SET at 4.0 kg/cm2g
Yes
After sending ST LP-CV OFF signal to DCS, ST TCS performs the following job :
Decrease STG load to 25% load.Transfer from CV to ICV at 25% STG load.Decrease STG load to 5% load rapidly.Trip STG (GCB open)
Then, ST TCS sends ST NORMAL TRIP to DCS.
HRSG2 LP Isolation ValveFully Closed
No(Wait)
ST NORMAL TRIPsignal received
No(Wait)
C(305, B)
Yes(GT2 Stop)
HRSG2 HRH Bypass Valve CAS / SET at 6.5 kg/cm2g
ST Stop
LEAD HRSG2 Isolated
Yes
ENGS
OFT
APS-FC-205, Rev. A
Dwg. No. APS-FC-205 / GT1 Stop and HRSG1 Bypass Valve Close
HRH Bypass ValveOpening < 10%
HP Bypass ValveFully Closed
Float HRSG1 HP Bypass Valve Set Pressure at 3 kg/cm2 above HRSG1 HP Steam Pressure
Yes
Maximum set pressure shall be limited above maximum operating pressure, but less than HRSG SH safety valve
set pressure.
No(Wait)
Yes
HRSG1 HRH Bypass Valve FORCED TO FULL CLOSE
Float HRSG1 HRH Bypass Valve Set Pressure at 2 kg/cm2 above HRSG1 HRH Steam Pressure
No(Wait)
Maximum set pressure shall be limited above maximum operating
pressure, but less than HRSG RH safety valve
set pressure.
HRH Bypass ValveFully Closed
Yes
No(Wait)
C(202, D) APS SD End
D(202, E)APS SD End
GT1 STOP(CB)
Turn on GT1 “REMOTE” at GT1 TCP
(by Operator)
Send GT1 “STOP” signal to GT1 TCP
(During GT1 stops, HRSG1 HP and HRH bypass valves close. HRSG1 HP Econ Bypass Valve also closes.)
GT1 TCP “REMOTE” Selected
No
Yes
GT1 Stop
A(204, B)
LEAD HRSG1Isolated
B(204, C)
ST Stopped forLAG HRSG1
HP Bypass ValveOpening < 10%
Yes
HRSG1 HP Bypass Valve FORCED TO FULL CLOSE
No(Wait)
Note :HRSG LP Econ Bypass Valve has no minimum opening, and thereby there is no need to float its set pressure.
HRSG1 HP Bypass Valve
ClosedYes
HRSG1 HRH Bypass Valve
ClosedYes
ENGS
OFT
APS-FC-305, Rev. A
Dwg. No. APS-FC-305 / GT2 Stop and HRSG2 Bypass Valve Close (Same with HRSG1)
HRH Bypass ValveOpening < 10%
HP Bypass ValveFully Closed
Float HRSG2 HP Bypass Valve Set Pressure at 3 kg/cm2 above HRSG2 HP Steam Pressure
Yes
Maximum set pressure shall be limited above maximum operating pressure, but less than HRSG SH safety valve
set pressure.
No(Wait)
Yes
HRSG2 HRH Bypass Valve FORCED TO FULL CLOSE
Float HRSG2 HRH Bypass Valve Set Pressure at 2 kg/cm2 above HRSG2 HRH Steam Pressure
No(Wait)
Maximum set pressure shall be limited above maximum operating
pressure, but less than HRSG RH safety valve
set pressure.
HRH Bypass ValveFully Closed
Yes
No(Wait)
C(202, G) APS SD End
D(202, H)APS SD End
GT2 STOP(CB)
Turn on GT2 “REMOTE” at GT2 TCP
(by Operator)
Send GT2 “STOP” signal to GT2 TCP
(During GT2 stops, HRSG2 HP and HRH bypass valves close. HRSG2 HP Econ Bypass Valve also closes.)
GT2 TCP “REMOTE” Selected
No
Yes
GT2 Stop
A(304, B)
LEAD HRSG2Isolated
B(304, C)
ST Stopped forLAG HRSG2
HP Bypass ValveOpening < 10%
Yes
HRSG2 HP Bypass Valve FORCED TO FULL CLOSE
No(Wait)
Note :HRSG LP Econ Bypass Valve has no minimum opening, and thereby there is no need to float its set pressure.
HRSG2 HP Bypass Valve
ClosedYes
HRSG2 HRH Bypass Valve
ClosedYes
ENGS
OFT