TDBFP- ISOLATION & NORMALOSATION

TDBFP Isolation & Normalisation

Isolation Procedure

• TDBFP unloaded and on Barring

Steam side Isolation:

• Close CRH block valve and isolate Power supply
• Close Extraction Manual Valve(coming from IPT Extraction) at 8.5 m
• Close Aux PRDS manual valve at 8.5 m
• Close Exhaust hood spray manual valve at 8.5 m
• Isolate Power supply of Warm up of ACV

Vacuum Side Isolation

• Close TDBFP Exhaust Valve and isolate its Power supply. Ensure from local that exhaust valve is fully closed
• Start standby Vacuum Pump
• Close Drains:CRH-135, CRH-153, CRH-141, CRH-129, DR1, DR2
• Close Gland steam control Valve and its manual valve
• Close Gland steam leak off valve
• Open the Extraction steam motorised vent valve before ESV
• Keep an eye on Vacuum while carrying out isolation

Stop Barring Gear

• Stop Barring Gear after Turbine Casing Metal Temperature is <85 Deg

After Stopping Barring Gear

• Isolate Power Supply of Barring Gear

Feed Water Isolation Procedure:

• Close Discharge & Its IBV and Isolate its Power supply
• Close SH & RH spray manual isolating valves at 8.5 m
• Close Recirculation Control Valve & Recirculation Manual Valve
• Close Booster Pump Suction Valve at 8.5 m
• Open Feed Water side Vents ( SH, RH spray vents, Booster pump/Main Pump suction strainer, Booster P/p and main P/p Casing )
• Open Feed Water side Drains (SH, RH spray, suction strainer, Main p/p Discharge line, Recirculation Control valve drain)
• Check for Complete depressurisation by observing the booster pump suction pressure
• Close Mechanical sealing line and jacket cooling line valves (if required)
• Close Ammonia Dosing valve

 Oil Side Isolation

• TDBDP on standstill condition (Speed Zero)
• Ensure that EOP is running
• Keep EOP in manual and Isolate its power supply and lock the module
• Stop JOP, AOP -A , AOP- B and Isolate Power supplies and Lock the modules

Locking By Chain:

• Extraction steam Manual Valve
• Aux PRDS Manual valve at 8.5 m
• Recirculation Mnaual Valve at D/A floor'
• Booster p/p suction valve at 8.5 m
• SH, RH spray manual valve at 8.5 m

Normalisation Procedure

• Normalise Power Supply of EOP
• Start EOP, Monitor LO Header Pr and Check for any Oil leakage at 0m. 8.5m, 17m
• Normalise Power Supply of JOP
• Normalise Power Supply of AOP-A, AOP-B
• Normalise Power Supply of Barring Gear
• Start one AOP, Monior LO Header Pr, Control Oil Pr, Check for any Oil leakge
• Stop EOP and put in Auto
• Start JOP, Monitor its Dicharge Pr and Check for any oil leakage
• Ensure on eVEF in service
• Ensure Lube oil Cooler is charged from water and oil side
• Keep lube oil temperature control in Auto

Unlocking of Chain

• All the locked as Above

Feed Water Side Normalisation

• Charge Mechanical seal and jacket cooling line for Bp/ MP
• Close Feed Water drains and Crack Open Vents as Above
• Open Recircualtion Manual valve at D/A & Open Rcirculation Control valve
• Crack OPEN Booster Pump Suction valve at 8.5 m( Monitor BP Suction strainer and Temperature)
• Close Vents after air release and sufficient Wter is coming out.
• At 1.5 to 2 ksc Booster Pump suction Pressure , Open Barring Gear
• Put TDBFP on Barrinf, if Required do Hand Barring
• Open suction valve Full. After putting it on Barring
• Open SH and RH spray manual valve at 8.5 m
• Normalise Power Supply of Dicharge Valve & its IBV

Vacuum Side Normalisation

• Open Gland steam Header Drain atmosphere valve
• Open Gland seal steam isolation valve and normalise GS supply nual valves and its By-pass Valve power supply
• Open GS leak-off manual valves and its By-pass Valve power supply
• Charge Gland Seal steam Tempearature and Pressure
• Close the drain valve
• Put gland Seal Steam Pressure Controller in Auto
• Normalise Power Supply of DR1, DR2, upstream drain of ESV, and Keep it OPEN
• Keep Standby Vacuum Pump in service
• Normalise Power Supply of Exhaust steam valve
• Crack Open Exhaust steam valve and Observe Condenser Vacuum
• Wait till TDBFP Exhaust Pr approaches to Condenser Vacuum
• Gradually Open Full Exhaust Steam Valve keeping an eye on condenser Vacuum

Steam Side Normalisation

• Normalise Power Supply of CRH Block valve and warm up of ACV
• Open steam drains: Downstream & UPstream of ACV, Upsteam of CRH block valve
• Open Extraction Manual Valve at 8.5 m( Keep Extraction steam upstream ESV vent valve Open)
• Open Aux PRDS Manual valve at 8.5 m
• Open Exhaust hood spray manual valve at 8.5 m

TDBFP Ready for Rolling

• Open BFP Discharge valve at 60 ksc of Discharge Pressure
• Record all TSI and other parameters before and after Rolling
• FW side vent valves are to be tightly closed before attaining full pressure
• Keep steam vent upstream of ESV OPen while Opening CRH Block valve
• Open CRH Bock valve before loading the TDBFP
• Open Ammonia Dosing Valve
• Ensure following drains closed: Downstream of ACV, Upstream of ESV, Upstream of Aux PRDS, Upstream of CRH BLock valve