turbine drains

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NTPC/TSTPS OPERATION DEPARTMENT TS-II/OPN/OI /TG/ / 041

AREA – TG Operating Instruction ForManagement of Turbine Drains

REV 0.00

UNIT - 3/4/5/6 Date : 25/ 02/2009

Sheet 1 Of 7

Prepared By Reviewed By Approved By

A PURPOSE:-

This document is prepared to guide the operating personnel for managing the turbine side drains during a unit startup ,shutdown & normal operating condition in stage- II of NTPC /TSTPS .

B SCOPE: :-

This shall be applicable to all the 4 units of stage - II , TSTPS ( 4 X 500 MW Units ) .

C INTRODUCTION : -

Drains play an important role in any system charged with steam . This is basically provided to drain outthe condensate before charging steam in a pipeline & subsequently allows sufficient flow in the line for initial warmup . Also this allows to drain the condensate during cooling of any pipeline .Normally the big headers like MS

/CRH / HRH are provided with drain pots where the condensate is expected to collect & subsequently they aredrained by operation of these drain valves . To avoid human interventions some of the drains depending on theirlocation & importance severity they are interlocked with certain logics or instruments like level switches & so on .

If the condensate is not properly drained & steam is charged into a line , then it will lead to severehammering in the line causing major damages & sometime forced outage of the units due to failure of thesupport system . Hence due care is to be taken while operating these drains .

Each Motor Operated drain is provided with a manual isolating valve for isolation of the drain valvedepending on requirement . But in case of MAW 11 drain valve no isolation valve is provided . However a bypassline with 6-10 mm orifice is provided for continuous bleeding .Some systems are provided with orifice operatedcontinuous drains for continuous bleeding of steam /condensate .At some places drains are provided with steam draintraps which should always be kept in service .

D TECHNICAL DATA OF THE SYSTEM

The Following drains are provided in the turbine system of stage - II Units .

Sl No Valve Tag Description of ValveManual Isolation

Valve Openprovided

Down Stream TempPoint Provided

• ATMOSPHERIC DRAINS

01. MS LINE Drain at TG “0” Mtr Yes No

02. CRH LINE Drain at TG “0” Mtr Yes No

03. HRH LINE Drain at TG “0” Mtr Yes No

04. CRH Drain Before NRV at TG “0” Mtr Yes No

05. LPBP line 1& 2 Drain at TG “0” Mtr Yes No

06. UFT vent line drain at TG “0” Mtr Yes No

• IBD TANK ( 02 nos )

07. MS 401 MS line L Drain before MSSV ( Left ) Yes No

08. MS402 MS line R Drain before MSSV ( Right ) Yes No

• UNIT FLASH TANK ( 08 nos )

09. BP 101 HPBP Drain ( Left ) Yes No





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10. BP 102 HPBP Drain ( Right ) Yes No

11. MS 419 MS Line Drain Before Strainer Yes No

12. MS 101 MS Strainer Drain ( Left ) Yes Yes

13. MS 102 MS Strainer Drain ( Right ) Yes Yes

14. HRH 101 HRH Strainer Drain ( Left ) Yes Yes

15. HRH 102 HRH Strainer Drain ( Right ) Yes Yes

16. HRH 604 HRH Line Hdr Drain Yes No

• STARTUP DRAIN FLASH TANK ( 12 nos )

17. MS 105 MS Strainer Drain ( Left ) Yes Yes

18. MS 106 MS Strainer Drain ( Right ) Yes Yes

19. MS 417 MS Line Drain Before Strainer Yes Yes

20. CRH 101 CRH NRV Drain Yes NO

21. CRH 501 CRH Line Drain Yes NO

22. HRH 105 HRH Strainer Drain ( Left ) Yes Yes

23. HRH 106 HRH Strainer Drain ( Right ) Yes Yes

24. HRH 606 HRH Line Drain Before Strainer Yes NO

25. LP 625 LPBP Line Drain ( Left ) Yes NO

26. LP 624 LPBP Line Drain ( Right ) Yes NO

27. HRH 109 LPBP Warm up Line Drain ( Left ) Yes Yes

28. HRH 110 LPBP Warm up Line Drain ( Right ) Yes Yes

• HP DRAIN FLASH TANK ( 13 nos )

29. EX 105 Extraction to HPH 5 A / 5 B Line Drain Yes Yes

30. AS 122 Turbine Gland Steam Seal Drain Yes NO

31. AS 104 Aux. Steam to BFPT – A Line Drain Yes NO

32. AS 109 Aux. Steam to BFPT – B Line Drain Yes NO

33. CRH 129 CRH to BFPT – A DS Line Drain Yes NO

34. CRH 141 CRH to BFPT – B DS Line Drain Yes NO

35. CRH 135 Steam to BFPT – A Line Drain Yes NO

36. CRH 147 Steam to BFPT – B Line Drain Yes NO

37. CRH 109 CRH to DEA Pegging Line Drain Yes NO

38. CRH 116 CRH to BFPT – A Line Drain Yes NO

39. CRH 123 CRH to BFPT – B Line Drain Yes NO

40. EX 101 Extraction to HPH – 6 A Line Drain Yes Yes

41. EX 102 Extraction to HPH – 6 B Line Drain Yes Yes

• LP DRAIN FLASH TANK ( 07 nos)

42. CRH 153 CRH to DEA Pegging DS of CV Line Drain Yes NO

43. EX 109 Extraction to BFPT – A & B Line Drain Yes NO

44. EX 115 Extraction to DEA Line Drain Yes NO

45. EX 110 Extraction to LPH – 3 Line Drain Yes NO

46. EX 112 Extraction to LPH – 2 Line Drain Yes NO





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47. AS 113 S SCAPH Line Drain Yes NO

48. AS 114 P SCAPH Line Drain Yes NO

TURBINE DRAIN ( FLASH BOX – 1 Towards SWYD ) 06 nos

49. MAL 11 Drain Before HPCV - 1 Yes Yes

50. MAL 26 Drain Before IV - 1 Yes Yes

51. MAL 65 Drain Before CRH NRV Yes Yes

52. MAL 31 Drain After IV - 1 Yes Yes

53. MAL 32 Drain After IV - 2 Yes Yes

54. MAL 22 HP Casing Drain Yes Yes

TURBINE DRAIN ( FLASH BOX – 2 Towards Boiler ) 08 nos

55. MAL 12 Drain Before HPCV - 2 Yes Yes

56. MAL 27 Drain Before IV - 2 Yes Yes

57. MAL 47 Drain of Extraction Valve A 5 Yes Yes

58. MAL 51 Drain of Extraction Valve A 4.1 Yes Yes

59. MAL 52 Drain of Extraction Valve A 4.2 Yes Yes


61. MAL 81 Gland Steam Header Drain Yes Yes


D OPERATING INSTRUCTIONS :

The following instructions are to be followed during the Unit normal operation , Unit Hot & Cold start-up &Unit shutdown conditions .

D-1 Normal Operation :-

• Always ensure the SLC drain is kept “ ON “.

• Check all the Drain MOV ( Motor Operated Valve) are manually tightened and no passing is observedindicated by high temp at the down stream of the MOV checked either through online measurement orthrough Temp Gun at local .

• If the temp is maintaining very HI (Suspected Passing) then the manual valve for the MOV can be keptclosed with proper record in the Log Book as well as the information to be made available in soft form .

• Necessary WOC to be raised for such drains .

D-2 Unit start-up Operation :-

D-2.1 Hot Start-up

D-2.1.1. The Alternate drains connected to UFT are not to be opened at all such as .( BP 101 ,BP 102,MS 419,MS 101,MS 102,HRH 101,HRH 102,HRH 604 )D-2.1.2. Check the following turbine drains are opened as per SLC logic after the Unit Has tripped out .

MAL 11 Drain Before HPCV - 1 MAL 12 Drain Before HPCV - 2

MAL 26 Drain Before IV - 1 MAL 27 Drain Before IV - 2MAL 65 Drain Before CRH NRV MAL 47 Drain of Extraction Valve A 5

MAL 31 Drain After IV - 1 MAL 51 Drain of Extraction Valve A 4.1





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MAL 32 Drain After IV - 2 MAL 52 Drain of Extraction Valve A 4.2

MAL 54 Drain of Extraction Valve A 3MAL 55 Drain of Extraction Valve A 2

D-2.1.3. Open MS/HRH Strainers drains to SDFT MS 105/106 & HRH 105/106 ( Operated from BHEL CRT ) immediatelyafter turbine tip out . On auto these drains open at SGC Shutdown programme at step 53 .D-2.1.4. Open CRH Hdr Drain CRH 501 to SDFT . This drain actually operates on auto based on the Drain Pot Level

Switch actuation .D-2.1.5. Ensure all the manual valves ( if anyone was closed ) of drains connected to the SDFT /FB-1& FB -2 / LP & HP FT

are opened as per the list attached as soon the unit has tripped .D-2.1.6. Now ensure the temperatures are picking up down stream of the drain as soon as soon as steam flow established

( where ever on line measurement provided)D-2.1.7. Now as the turbine rolling started the MS/HRH Strainers drains MS 105/106 & HRH 105/106 gets closed at step

13 . D-2.1.8. After Unit is synchronisation & Load pick up is > 100 MW ensure all the following drains are closed on auto


MAL 26 Drain Before IV - 1 MAL 27 Drain Before IV - 2MAL 65 Drain Before CRH NRVMAL 31 Drain After IV - 1MAL 32 Drain After IV - 2

D-2.1.9. Ensure the Extraction line drains are closed after the respective Extractions are charged .

MAL 47 Drain of Extraction Valve A 5 MAL 52 Drain of Extraction Valve A 4.2MAL 51 Drain of Extraction Valve A 4.1 MAL 54 Drain of Extraction Valve A 3

MAL 55 Drain of Extraction Valve A 2

D-2.1.10. Check all the TDBFP drains are closed after TDBFP’s are loaded .

D-2.2 Absolute Cold / Warm Start-up .D-2.2.1. While pulling Vacuum keep the drains connected to vacuum system closed for faster pulling of vacuum . Then

slowly open one by one as per requirement .D-2.2.2. Never operate both the main & alternate drain valve simultaneously , this will lead to vacuum drop in the system .D-2.2.3. Ensure the manual valves of following drains connected to the UFT / SDFT /FB-1& FB -2 / LP & HP FT are opened

as per the list attached before charging MS Line .D-2.2.4. The atmospheric drain s provided in MS /CRH / HRH l ine are to be kept open ( Crack ) for initial charging MS line

/ HP & LP Bypass system for release of condensate . They are to be closed after ensuring sufficient steam flow .D-2.2.5. The Alternate drains to UFT are to be kept open initially for better Silica control in the Unit .D-2.2.6. The Header Drains of MS/CRH/HRH Such as MS 417/419 , HRH 606/604 , CRH 501 are to be kept open till 20 %

steam Flow .D-2.2.7. The MS/HRH Strainers drains MS 105/106 & HRH 105/106 are to be kept opened till rolling of TG set .D-2.2.8. Check the following turbine drains are opened as per SLC logic before TG Set Rolling

MAL 11 Drain Before HPCV - 1 MAL 12 Drain Before HPCV - 2MAL 26 Drain Before IV - 1 MAL 27 Drain Before IV - 2MAL 65 Drain Before CRH NRV MAL 47 Drain of Extraction Valve A 5

MAL 31 Drain After IV - 1 MAL 51 Drain of Extraction Valve A 4.1MAL 32 Drain After IV - 2 MAL 52 Drain of Extraction Valve A 4.2MAL-22 HPC drain . MAL 54 Drain of Extraction Valve A 3MAW-11 Seal steam supply drain MAL 55 Drain of Extraction Valve A 2





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D-2.2.9. The temp points provided for the major drains are functioning indicated by the rise in temp when ever steamflows in those drain .

D-2.2.10. For Charging HP/LP Bypass the HPBP Warm up Line Drains

D-2.2.11. Normally the drains are kept closed as soon as sufficient steam flow is established in the system . Such as

• Close MS Line drains to IBD ( MS401/402) once the Main MS SV are full open .

• Close the CRH hdr atmospheric drain after HP/LP bypass is charged & sufficient steam coming .

• Close the MS /HRH Hdr Drains MS 417/419 , HRH 606/604 once HP /LP bypass is chargedD-2.2.12. Check the following turbine drains are opened as per SLC logic after the Unit Has tripped out .

MAL 11 Drain Before HPCV - 1 MAL 12 Drain Before HPCV - 2MAL 26 Drain Before IV - 1 MAL 27 Drain Before IV - 2

MAL 65 Drain Before CRH NRV MAL 47 Drain of Extraction Valve A 5MAL 31 Drain After IV - 1 MAL 51 Drain of Extraction Valve A 4.1MAL 32 Drain After IV - 2 MAL 52 Drain of Extraction Valve A 4.2

MAL 54 Drain of Extraction Valve A 3MAL 55 Drain of Extraction Valve A 2

D-2.2.13. The MS /HRH strainer drains MS 105/106 & HRH 105/106 are automatically closed once TG set Rolling started atstep 13 .

D-2.2.14. After Unit is synchronisation & Load pick up is > 100 MW ensure all the following drains are closed on autoMAL 11 Drain Before HPCV - 1 MAL 12 Drain Before HPCV - 2

MAL 26 Drain Before IV - 1 MAL 27 Drain Before IV - 2MAL 65 Drain Before CRH NRVMAL 31 Drain After IV - 1

MAL 32 Drain After IV - 2

D-2.2.15. Ensure the Extraction line drains are closed after the respective extractions are charged .

MAL 47 Drain of Extraction Valve A 5 MAL 52 Drain of Extraction Valve A 4.2

MAL 51 Drain of Extraction Valve A 4.1 MAL 54 Drain of Extraction Valve A 3

D-2.2.16. Check all the TDBFP drains are closed after TDBFP’s are loaded .

D-2.2.17. Ensure the turbine casing drain MAL22 is closed after HPT casing temp attained > 320 0 C on auto .

D-3 Unit Shutdown Operation :-

When ever the unit goes under shut down , very care full drain operation management is to be followed . Sometimes keeping additional drains open may lead to cooling of the turbine components . The situations will bedifferent with vacuum being maintained or killed .

D-3.1 If Vacuum is maintained .

D-3.1.1. The SLC drain should be kept ON .D-3.1.2. As soon as the turbine is hand tripped or tipped ensure the following drains are opened on auto .


MAL 26 Drain Before IV - 1 MAL 27 Drain Before IV - 2MAL 65 Drain Before CRH NRV MAL 47 Drain of Extraction Valve A 5MAL 31 Drain After IV - 1 MAL 51 Drain of Extraction Valve A 4.1MAL 32 Drain After IV - 2 MAL 52 Drain of Extraction Valve A 4.2





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D-3.1.3. Open MS/HRH Strainers drains to SDFT MS 105/106 & HRH 105/106 ( Operated from BHEL CRT ) immediately

after turbine tip out . On auto these drains open at SGC Shutdown programme at step 53 .D-3.1.4. Open CRH Hdr Drain CRH 501 to SDFT . This drain actually operates on auto based on the Drain Pot LevelSwitch actuation .

D-3.1.5. Ensure all the manual valves ( if anyone was closed ) of drains connected to the SDFT /FB-1& FB -2 / LP & HP FTare opened as per the list attached as soon the unit has tripped .

D-3.1.6. Now ensure the temperatures are picking up down stream of the drain as soon as soon as steam flow established (Where ever on line measurement provided)

D-3.1.7. As Boiler is Boxed up by closing the MS stop Valves Ensure the opening of following drains

MS 105 MS Strainer Drain ( Left ) HRH 606 HRH Line Drain Before StrainerMS 106 MS Strainer Drain ( Right ) LP 625 LPBP Line Drain ( Left )

MS 417 MS Line Drain Before Strainer LP 624 LPBP Line Drain ( Right )CRH 101 CRH NRV Drain HRH 109 LPBP Warm up Line Drain ( Left )CRH 501 CRH Line Drain HRH 110 LPBP Warm up Line Drain ( Right )HRH 105 HRH Strainer Drain ( Left )

HRH 106 HRH Strainer Drain ( Right )

D-3.1.8. Ensure that the HPC drain MAL 22 has opened after HPC temp drops below 300 0 C .D-3.1.9. Ensure TDBFP drains are opened after TDBFP Tripping .

D-3.2 If Vacuum is Killed .

D-3.2.1. Ensure complete isolation of seal steam supply to turbine gland steam system by closing both HT/LT manual isolationvalves from APRDS at APRDS level . Also the manual isolation valve at 8.5 mtr before seal steam control stationmanual valve is closed & the drain to UFT before it is opened .

D-3.2.2. SLC Drain is “ ON “D-3.2.3. Since MS / HRH Lines are depressurised , keep all the atmospheric drains open .D-3.2.4. The Following drains to UFT are open

BP 101 HPBP Drain ( Left ) MS 102 MS Strainer Drain ( Right )BP 102 HPBP Drain ( Right ) HRH 101 HRH Strainer Drain ( Left )

MS 419MS Line Drain BeforeStrainer

HRH 102 HRH Strainer Drain ( Right )

MS 101 MS Strainer Drain ( Left ) HRH 604 HRH Line Hdr DrainD-3.2.5. Ensure the following turbine drains are open on auto .


MAL 26 Drain Before IV - 1 MAL 27 Drain Before IV - 2MAL 65 Drain Before CRH NRV MAL 47 Drain of Extraction Valve A 5

MAL 31 Drain After IV - 1 MAL 51 Drain of Extraction Valve A 4.1MAL 32 Drain After IV - 2 MAL 52 Drain of Extraction Valve A 4.2MAL 81 Seal steam Hdr Drain MAL 54 Drain of Extraction Valve A 3

MAW 11 Seal steam supply drain MAL 55 Drain of Extraction Valve A 2

D-3.2.6. Check HPT casing drain MAL 22 is opened after temp drops < 300 0 C .D-3.2.7. Ensure all the SDFT / LPFT/ HPFT drains are open



NTPC/TSTPP OPERATION DEPARTMENT

AREA – TGOperating Instruction For Management of Turbine Drains

UNIT - 3/4/5/6

!

SL

NO.

DRAIN VALVE

DESCRIPTION

KKS

CODE

LOCATI

ON

MAN

CLOSE

MAN

OPEN

AUTO

CLOSE

AU

OP

1DRAIN HPCASING

MAL22AA011 0 M TG Y Y HP OUTER CASING TOP >320 DEG .CHP OUTER

<300

AND A

HP OUTER CASING BOT >320 DEG .CHP OUTE

BOT<30

OR O

HP OUTER CASING TOP >320 DEG .CHP OUTER

<300D

OR O

HP OUTER CASING BOT >320 DEG .CHP OUTER

<300

AND A

GEN LOAD > 10 % GEN LO

2DRAIN BEFORE

HPCV-1MAL11AA011 0 M TG Y Y SGC TURBINE STEP-3

ORSGC TURBIN

STE

SGC TURBINE STEP-16

OR

SGC TURBINE STEP -19

3DRAIN BEFORE

HPCV-2MAL12AA011 0 M TG Y Y SGC TURBINE STEP-3

ORSGC TURBIN

STE

SGC TURBINE STEP-16

OR

SGC TURBINE STEP -19

4HRH STRAINER

DRAIN -1(L)LCM20AA202 0 M TG Y Y SGC TURBINE STEP -14 SGC TURB

5HRH STRAINER

DRAIN -2( R)LCM20AA203 0 M TG Y Y O

6 MS STRAINER LCM20AA206 0 M TG Y Y SGC TURBIN





UNIT - 3/4/5/6

!

SL

NO.

DRAIN VALVE

DESCRIPTION

KKS

CODE

LOCATI

ON

MAN

CLOSE

MAN

OPEN

AUTO

CLOSE

AU

OP

DRAIN -1(L) STE

7

MS STRAINER

DRAIN -2( R) LCM20AA207 0 M TG Y Y

8DRAIN BEFORE

IV-1MAL26AA011 0 M TG Y Y DT(IV1 -CRH) >50 DEG .K DT(IV1 -CRH

9DRAIN BEFORE

IV-2MAL27AA011 0 M TG Y Y AND A

10DRAIN AFTER IV-

1MAL31AA011 0 M TG Y Y T BEHIND ICV-2 >300 DEG.C T BEHIND ICV

11DRAIN AFTER IV-

2MAL32AA011 0 M TG Y Y OR O

DT(IV1 -CRH) >50 DEG .K DT(IV1 -CRH

OR O

T BEHIND ICV-2 >300 DEG.C T BEHIND ICV

AND A

IPCV-2 NOT CLOSED&

IPCV-1 NOT CLOSED

IPCV-2

IPCV -1

12GLAND STEAM

DRAINMAL81AA011 0 M TG Y Y GLAND STEAM TEM -1 >150 DEG.C

GLAND STEADE

AND O

GLAND STEAM TEM -2 >150 DEG.CGLAND STEA

DE

13DRAIN

EXTRACTION V/VA-5

MAL47AA011 0 M TG Y Y EXTRACTION V/V A-5 > 15% EXTRACTION

AND O

GEN LOAD >10% GEN LO

14DRAIN

EXTRACTION V/VA-4.1

MAL51AA011 0 M TG Y Y EXTRACTION V/V A-4.1 > 15% EXTRACTION

AND O

DP EXTRACTIONV/V A-4.1 >300mmwc DP EXTRACT





UNIT - 3/4/5/6

!

SL

NO.

DRAIN VALVE

DESCRIPTION

KKS

CODE

LOCATI

ON

MAN

CLOSE

MAN

OPEN

AUTO

CLOSE

AU

OP

<100

15DRAIN

EXTRACTION V/VA-4.2

MAL52AA011 0 M TG Y Y EXTRACTION V/V A-4.2 > 15% EXTRACTION

AND O

DP EXTRACTIONV/V A-4.2 >300mmwcDP EXTRACT

<100

16DRAIN

EXTRACTION V/VA-3


AND O


17DRAIN

EXTRACTION V/V

A-2


AND O


18WARMING UP

DRAINMAW11AA011 0 M TG Y Y

GLAND STEAM TEM BEFV/V>270(DEG.C)

GLAND STBEFV/V<2

19DRAIN BEF CRH

NRVMAL65AA011 0 M TG Y Y CRH NRV >100% CRH N

AND O

GEN LOAD >10% CRH NR

O

GEN LO



NTPC/TSTPP OPERATION DEPARTMENT TS-II/OPN/OI /TG/ / 041


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!

Interlocks for valves connected to Flash tanks

Sl

NoValve Tag Description of Valve Auto open Auto close

Protection

open• IBD TANK ( 02 nos )

01. MS 401MS line L Drain before MSSV (Left )

OPEN Command fromGC

CLOSE Command from GC NIL

02. MS402MS line R Drain before MSSV (Right )

OPEN Command fromGC

CLOSE Command from GC NIL

• UNIT FLASH TANK ( 08 nos)

03. BP 101 HPBP Drain ( Left ) NIL BLI>10% NIL

04. BP 102 HPBP Drain ( Right ) NIL BLI>10% NIL

05. MS 419 MS Line Drain Before Strainer NIL NIL NIL

06. MS 101 MS Strainer Drain ( Left )DRAIN TO SDFT

CLOSE DRAIN TO SDFT OPEN NIL

07. MS 102 MS Strainer Drain ( Right )DRAIN TO SDFT

CLOSEDRAIN TO SDFT OPEN NIL

08. HRH 101 HRH Strainer Drain ( Left )DRAIN TO SDFT


09. HRH 102 HRH Strainer Drain ( Right )DRAIN TO SDFT


10. HRH 604 HRH Line Hdr Drain NIL NIL NIL

11. STARTUP DRAIN FLASH TANK( 12 nos )

12. MS 105 MS Strainer Drain ( Left )SGC TG STEP-2 OR

SGC TG S/D STEP-53SGC TG STEP-14 NIL

13. MS 106 MS Strainer Drain ( Right ) SGC TG STEP-2 ORSGC TG S/D STEP-53 SGC TG STEP-14 NIL

14. MS 417 MS Line Drain Before Strainer NIL NIL NIL

15. CRH 101 CRH NRV Drain NIL NIL NIL

16. CRH 501 CRH Line Drain

COMMAND FROM GCOR

CRH DRAIN POT LEVELHIGH

COMMAND FROM GCOR

CRH DRAIN POT LEVELNOT HIGH

CRH DRAINPOT LEVELVERY HIGH

17. HRH 105 HRH Strainer Drain ( Left )SGC TG STEP-2 OR


18. HRH 106 HRH Strainer Drain ( Right )SGC TG STEP-2 OR


19. HRH 606 HRH Line Drain Before Strainer

OPEN COMMAND

FROM GC

CLOSE COMMAND FROM

GC NIL

20. LP 625 LPBP Line Drain ( Left ) NIL NIL NIL

21. LP 624 LPBP Line Drain ( Right ) NIL NIL NIL

22. HRH 109 LPBP Warm up Line Drain ( Left ) NIL BLI>10% NIL





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SlNo

Valve Tag Description of Valve Auto open Auto closeProtection

open

23. HRH 110 LPBP Warm up Line Drain ( Right ) NIL BLI>10% NIL

• HP DRAIN FLASH TANK ( 13nos )

24. EX 105Extraction to HPH 5 A / 5 B LineDrain

OPEN COMMANDFROM SCM-A OR

HPH-5A/5B EXT. VALVECLOSED

OROPEN COMMMMAND

FROM SCM-B

CLOSE COMMAND FROMSCM-A

ORHPH-5A/5B EXT. VALVE

OPENOR

CLOSE COMMMMANDFROM SCM-

HPH-5A/5B/6ALVL VERY

HIGH

25. AS 122 Turbine Gland Steam Seal DrainSEAL STEAM INLETTEMP<250 DEG.C

SEAL STEAM INLETTEMP>270 DEG.C

NIL

26. AS 104Aux. Steam to BFPT – A LineDrain

OPEN COMMANDFROM SCM

ORBFP-A TRIPPED

ORBFP-A WORKING &AUXSTM TEMP<250DEG.C

SUCTION FLOW>30%AND

AUX STM TEMP>280DEG.CNIL

27. AS 109Aux. Steam to BFPT – B LineDrain


ORBFP-B TRIPPED

ORBFP-B WORKING &

AUX STM

TEMP<250DEG.C

SUCTION FLOW>30%AND

AUX STM TEMP>280DEG.CNIL

28. CRH 129 CRH to BFPT – A DS Line Drain


ORBFP-A TRIPPED

OR(ACV<2% AND AUXW/U VALVE OPEN)

SUCT FLOW>30%AND (ACV>2%OR WARMUP

VALVE OPEN)NIL

29. CRH 141 CRH to BFPT – B DS Line Drain


ORBFP-B TRIPPED

OR

(ACV<2% AND AUXW/U VALVE OPEN)

SUCT FLOW>30%AND (ACV>2%OR WARMUP

VALVE OPEN)NIL

30. CRH 135 Steam to BFPT – A Line Drain


ORBFP-A TRIPPED

CLOSE COMMAND FROMSCMAND

SUCT. FLOW>30%

NIL





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!

SlNo


open

31. CRH 147 Steam to BFPT – B Line Drain


ORBFP-B TRIPPED

CLOSE COMMAND FROMSCM

ANDSUCT. FLOW>30%

NIL

32. CRH 109 CRH to DEA Pegging Line Drain NIL NIL NIL

33. CRH 116 CRH to BFPT – A Line Drain


ORBFPT-A TIPPED

ORBFP-A WORKING &CRH

TEM<250 DEG.COR

CRH BLOK VALVECLOSE

CRH TEMP>290 DEG.CAND

AUX STM BLOCK VALVEOPEN

NIL

34. CRH 123 CRH to BFPT – B Line Drain


ORBFPT-B TIPPED

ORBFP-B WORKING &CRH

TEM<250 DEG.COR

CRH BLOK VALVECLOSE

CRH TEMP>290 DEG.CAND

AUX STM BLOCK VALVEOPEN

NIL

35. EX 101 Extraction to HPH – 6 A Line Drain


ORHPH-6A EXT. VALVE

CLOSED

CLOSE COMMAND FROM

SCMANDHPH-6A EXT VALVE OPEN

HPH5A/5B/6ALVL VERY

HIGHOR

TURBINETRIPPED

36. EX 102 Extraction to HPH – 6 B Line Drain


ORHPH-6B EXT. VALVE

CLOSED

CLOSE COMMAND FROMSCMAND

HPH-6B EXT VALVE OPEN

HPH5A/5B/6BLVL VERY

HIGHOR

TURBINETRIPPED

• LP DRAIN FLASH TANK ( 07nos)

37. CRH 153 CRH to DEA Pegging DS of CVLine Drain

NIL NIL NIL





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open

38. EX 109Extraction to BFPT – A & B LineDrain

OPEN COMMANDFROM BFP-A SCM

OROPEN COMMANDFROM BFP-B SCM

ORBFP-A/B NOT

WORKING

BFP-A SUCT FLOW >30%

&STM PRESS>3.5KSCAND

BFP-B SUCT FLOW >30%&STM PRESS>3.5KSC

NIL

39. EX 115 Extraction to DEA Line Drain NIL NIL NIL

40. EX 110 Extraction to LPH – 3 Line Drain


OREX-3 CLOSED

CLOSE COMMAND FROMSCMOR

EX-3 OPENED

LPH-3 LVLVERY HIGH

ORTURBINETRIPPED

41. EX 112 Extraction to LPH – 2 Line Drain


OREX-2 CLOSED

CLOSE COMMAND FROMSCMOR

EX-2 OPENED

LPH-2 LVLVERY HIGHOR

TURBINETRIPPED

42. AS 113 S SCAPH Line Drain NIL NIL NIL

43. AS 114 P SCAPH Line Drain NIL NIL NIL

turbine drains

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