HP Bypass System and Reheater Protection Logic. Supervisory and Monitoring Instrumentation. 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 kg/sq.cm
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Reheater Protection Logic
TWO Nos. PRESSURE TRANSMITTERS PROVIDED IN THE UPSTREAM OF HP BYPASS PRESSURE CONTROL VALVES, IN THE MAIN STEAM LINE.
RANGE : 0 TO 200 kg/sq.cm
TWO Nos. K-TYPE DUPLEX THERMOCOUPLES ARE PROVIDED IN EACH LINE, LOCATED AT THE DOWNSTREAM OF EACH HP BYPASS PRESSURE CONTROL VALVES.
RANGE : 100 TO 450°C.
PRESSURE / TEMPERATURE MEASUREMENT:
The 4 to 20 mA analog signals received from the Pressure transmitters and the mV signals received from Thermocouples are digitally processed in the DCS. These signals are monitored to generate internal and external digital signals for interlocks and alarm generation.
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
MAIN STEAM LINE