CC(BCW) Pump Isolation & Purging
1. ISOLATION OF CC PUMP REMARKS
1.1 Remove from Stand by mode if it is in auto
1.2 Stop CC pump if running
1.3 Isolate it Electrically
1.4 Close both the discharge valve of the CC pump if the boiler is to be drained.
2 If Work is to be carried out in Motor Cooling Water Circuit
2.1 Isolate the inlet & outlet manual valve of LP cooler
2.2 Ensure the water flowmeter reading of LP coolercooler shows
zero value.
3 If Work is to be carried out in Pump or in High Pressure line
3.1 Ensure the Unit is under Shutdown
3.2 Ensure that the Suction Manifold temp. is less than 100 deg C.
3.3 Close both discharge valve of all CC pumps.
3.4 Drain the Boiler
3.5 Open the pump casing vent of all CC pumps.
3.6 After water stops coming from all pump casing vent, then open the pump casing drain.
3.7 Ensure that the cavity is completely drained.
4 CC PUMP FILL PURGE
4.1 Ensure the following :
Electrical Isolation of CC pump
Both Discharge valve closed
Boiler is in drained condition.
4.2 Ensure both manual valves (just before entering pump cavity ) for filling pump cavity are in close condition so that water does not enter pump cavity.
4.3 Ensure DM Make up pump is running.
4.4 Open the basket strainer drain
4.5 Ensure the supply valve from BFP discharge is close and open the supply valve from DM make up pump to basket strainer.
4.6 Flushing is to be carried out from basket strainer drain until clean water starts coming out.
4.7 Open the fine filter drain valve& close the basket strainer drain valve
4.8 Line Flushing to be carried out from fine filter drain valve until clean water starts coming out
4.9 Open the final drain valve just before entering BCW pump cavity& close the fine filter drain valve.
4.10 Line Flushing is to be carried out from drain valve just before entering pump cavity until clean water starts coming out & conductivity is less than 1 μs/cm.
4.11 Inform Chemistry to keep measuring conductivity of water on hourly basis until three consecutive readings of conductivity less than 1 μs/cm is achieved.
4.12 Adjust the flow rate of water coming out of drain to 5 LPM after chemistry clearance. (After three consecutive reading , conductivity less than 1 μs/cm )
4.13 Open the casing vent of all pumps & both the manual valves for cavity filling. Close the drain valve.
4.14 When water starts coming out from pump casing vent, measure the conductivity of water.
4.15 On Achieving three consecutive readings of conductivity less than 1 μs/cm, pump casing vent & cavity filling line manual valves are to be closed.
4.16 Close main supply valve from DM make up pump (For Purge & filling)
4.17 Inform EMD for Motor Meggering.Take Electrical Clearance before starting pump.
4.18 Open Both discharge valves of CC pump after drum filling.
4.19 Normalize cooling water isolation valves & note down the cooling water flow rate of LP & cooler.
4.20 BCW pump can be started & observe its cavity temperature
1. ISOLATION OF CC PUMP REMARKS
1.1 Remove from Stand by mode if it is in auto
1.2 Stop CC pump if running
1.3 Isolate it Electrically
1.4 Close both the discharge valve of the CC pump if the boiler is to be drained.
2 If Work is to be carried out in Motor Cooling Water Circuit
2.1 Isolate the inlet & outlet manual valve of LP cooler
2.2 Ensure the water flowmeter reading of LP coolercooler shows
zero value.
3 If Work is to be carried out in Pump or in High Pressure line
3.1 Ensure the Unit is under Shutdown
3.2 Ensure that the Suction Manifold temp. is less than 100 deg C.
3.3 Close both discharge valve of all CC pumps.
3.4 Drain the Boiler
3.5 Open the pump casing vent of all CC pumps.
3.6 After water stops coming from all pump casing vent, then open the pump casing drain.
3.7 Ensure that the cavity is completely drained.
4 CC PUMP FILL PURGE
4.1 Ensure the following :
Electrical Isolation of CC pump
Both Discharge valve closed
Boiler is in drained condition.
4.2 Ensure both manual valves (just before entering pump cavity ) for filling pump cavity are in close condition so that water does not enter pump cavity.
4.3 Ensure DM Make up pump is running.
4.4 Open the basket strainer drain
4.5 Ensure the supply valve from BFP discharge is close and open the supply valve from DM make up pump to basket strainer.
4.6 Flushing is to be carried out from basket strainer drain until clean water starts coming out.
4.7 Open the fine filter drain valve& close the basket strainer drain valve
4.8 Line Flushing to be carried out from fine filter drain valve until clean water starts coming out
4.9 Open the final drain valve just before entering BCW pump cavity& close the fine filter drain valve.
4.10 Line Flushing is to be carried out from drain valve just before entering pump cavity until clean water starts coming out & conductivity is less than 1 μs/cm.
4.11 Inform Chemistry to keep measuring conductivity of water on hourly basis until three consecutive readings of conductivity less than 1 μs/cm is achieved.
4.12 Adjust the flow rate of water coming out of drain to 5 LPM after chemistry clearance. (After three consecutive reading , conductivity less than 1 μs/cm )
4.13 Open the casing vent of all pumps & both the manual valves for cavity filling. Close the drain valve.
4.14 When water starts coming out from pump casing vent, measure the conductivity of water.
4.15 On Achieving three consecutive readings of conductivity less than 1 μs/cm, pump casing vent & cavity filling line manual valves are to be closed.
4.16 Close main supply valve from DM make up pump (For Purge & filling)
4.17 Inform EMD for Motor Meggering.Take Electrical Clearance before starting pump.
4.18 Open Both discharge valves of CC pump after drum filling.
4.19 Normalize cooling water isolation valves & note down the cooling water flow rate of LP & cooler.
4.20 BCW pump can be started & observe its cavity temperature
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