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INSTRUMENTATION

PRESSURE MEASUREMENT:

TWO Nos. PRESSURE TRANSMITTERS PROVIDED IN THE

UPSTREAM OF HP BYPASS PRESSURE CONTROL VALVES, IN

THE MAIN STEAM LINE.

RANGE : 0 TO 200 kgs!."#

TEMPERATURE MEASUREMENT:

TWO Nos. $%TYPE DUPLE& THERMOCOUPLES ARE PROVIDED

IN EACH LINE, LOCATED AT THE DOWNSTREAM OF EACH HPBYPASS PRESSURE CONTROL VALVES.

RANGE : '00 TO ()0*C.

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PROCESS MONITORING

PRESSURE TEMPERATURE MEASUREMENT:

T+ ( -o 20 #A /og s1g/s "134 5o# -+ Pss6

-/s#1--s /4 -+ #V s1g/s "134 5o# T+#o"o67s

41g1-8 7o"ss4 1/ -+ DCS. T+s s1g/s #o/1-o4

-o g/- 1/-/ /4 9-/ 41g1- s1g/s 5o 1/-o"ks

/4 # g/-1o/.

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ALARMS, INTERLOCKS and

PROTECTION

ALARMS:

T+ 5oo1/g -+ #1/ A#s g/-4 1/ -+ s8s-#:• Pss6T#7-6 -/s#1--s 516.• M1/ s-# 7ss6 -oo +1g+.•

 Do/s-# -#7-6 +1g+38 +1g+.• T"k1/g Pss6 s- 7o1/- 516.• Pss6 "o/-o 33s o7/4 #o -+/ 2;.• Pss6 "o/-o 33s "os4 ss -+/ 2;.• H8461" O1 7ss6 -oo o.• A/8 5s- o7/1/g "1-1 o7-4.• A/8 "os1/g "1-1 o7-4.

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ALARMS, INTERLOCKS and

PROTECTION

INTERLOC$S:

T+ 5oo1/g -+ 1#7o-/- 1/-o"ks 7o3144 1/ -+

s8s-#:• W+/ -+ Pss6 "o/-o 33s "os4 ss -+/ 2; /4

  1/ M/6 #o4, 5o"4 "os s1g/ 1s 7o3144 -o 73/--+ 33 5o# 415- o7/.

• W+/ -+ M1/ s-# 7ss6 1s -oo +1g+, -+/ -+ Fs-

o7/1/g 431" 1s "-13-4.• W+/3 -+ 7ss6 "o/-o 33 1s o7/4 #o -+/

2;, -+/ -+ sso"1-4 S78 "o/-o 33 1 s1-"+o3   -o A6-o #o4, 15 1- s 1/ M/6 #o4

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ALARMS, INTERLOCKS and

PROTECTION

PROTECTION:

T+ 5oo1/g -+ 1#7o-/- 1/-o"ks 7o3144 1/ -+

s8s-#:

•

 W+/ -+ 4o/ s-# -#7-6 o5 Pss6 "o/-o 33s1s -oo +1g+ o +/ -+ "o/4/s 3"66# 1s o, -+/ -+

Pss6 "o/-o 33s "os4 o/ 71o1-8.

• W+/ -+ T6

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HP / LP BYPASS SYSTEMHRH

MSL

BOILER 

 BP

HPT MPT LPT

CRH

CRH NRV

LBP LPC CO

N

LBP

E

BFP

BPE

BD

LEGEND

BP : HP BYPASS VALVE BD : HP SPRAY ISOLATION VALVE CON : CONDENSOR 

LBP: LP BYPASS VALVE BPE : HP SPRAY VALVE LBPE : LP SPRAY VALVE

BFP: BOILER FEED PUMP CRH : COLD REHEAT LINE LPC : LP COOLER

HPT: HIGH PRESSURE TURBINE HRH : HOT REHEAT LINE LPT : LOW PR. TURBINE

MSL: MAIN STEAM LINE MPT : MEDIUM PR. TURBINE 

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HP BYPASS CONTROL SCHEME

=

P

T

=

MAIN STEAM LINE

BD

BPEMASTER 

PRESSURE

CONTROLLER 

TEMPERATURE

CONTROLLER 

PRESSURE

SET POINT

STATION

TEMPERATURE

SET POINT

STATION

To CRH

To TURBINE

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Reheater Protection Logic