STEAM TURBINE STANDARD OPERATING PROCEDURE

Steam Turbine standard operating procedures (SOPs)


Lube oil system operation


Pre-checks


• Ensure lube oil tank level is normal • Ensure lube oil pumps are healthy to operate


• Ensure lube filter & cooler are in service


• Ensure lube oil inlet and outlet valve provided at


filters & coolers are open Ensure cooling water inlet & outlet valves


provided for oil coolers are in closed condition
• Ensure suction & discharge valve of the pumps are in opened condition


Operation


. Start the oil pump (AOP)


• Ensure no abnormal sound & vibrations . Observe the discharge pressure


• Ensure header pressure is normal, if not adjust


with PRV or recirculation valve . Check the oil filter DP, if high change over the


filter


. Check overhead oil tank is getting filling
• Ensure lub oil is supplying to each bearing & adjust the oil pressure to each bearing as per


desired requirement . Maintain the oil temperature by adjusting


cooling water inlet & outlet valves.


Note: Keep open cooling water inlet valve 100% open & adjust the temperature by adjusting outlet valve


• Ensure the over head oil tank is full Keep stand by lube oil pump & EOP ready


Barring gear operation


• Ensure lube oil system is in service and oil is circulating at the bearings at a desired pressure


• Ensure barring gear motor is healthy to start & its all interlocks are in place


Engage the barring gear clutch . Start the barring gear motor


Observe the rotor is rotating at barring speed without increase in bearing vibrations & temperature


• Ensure there is no any abnormal sound
Cooling water system operation Pre-checks


• Ensure the cooling tower level is normal • Ensure cooling water pump is healthy to operate


& their protections & interlocks are in place


• Ensure cooling water pump (MCWP) suction


valve is open & discharge valve is closed


• Ensure all the field instruments are healthy & inline


• Ensure surface condenser inlet & outlet cooling


water line valves are open • Ensure Condenser water box vents are open


• Ensure cooling tower inlet cooling water line


valves are open


Operation


• Start the pump from DCS at 70% RPM


Open the discharge valve slowly • Observe discharge pressure is increasing


gradually


• Ensure the pump's vibration & bearing


temperatures are normal • After venting air from condenser water box


close the vent valves ⚫ Observe cooling water is falling in cooling water


• Increase the pump's speed as per requirement ⚫ Note down cooling water inlet & outlet water


temperature of condenser


. Start cooling tower fans one by one as per


requirement




Condensate system operation


• Ensure the hot well level is adequate. Otherwise make the hot well level with DM water


• Ensure the CEP is healthy & its all interlocks are in place


• Ensure pump's suction & discharge valves are open


• Ensure ejector & gland sealing steam condenser inlet & outlet cooling water line valves are open . Start the pump, ensure the water will flow from


ejector & Gland steam condenser (GSC)


• Ensure gland steam outlet control valve to deaerator is close & cooling water is recirculating through recirculating control valve
• If the hot well level increases, then GSC discharge valve can be opened


. Once the Turbine comes into line,GSC outlet control valve should be kept in auto mode to maintain hot well level


• Vacuum pulling & Vacuum killing


• Pre-checks


• Ensure auxiliary steam is available at desired pressure and temperature . Ensure vacuum breaker valve fitted on steam


condenser is closed • Ensure cooling water is circulating in the condenser and the turbine gland is charged fully


at 0.1 kg/cm2


• Ensure live steam line to ejector steam lines


drain are kept open • Ensure Hogger & main ejectors steam and air


valves are in closed condition


Vacuum pulling through hogger ejector


⚫ Charge the main steam line to ejector steam &


temperature control valve


• Ensure the rated pressure (10 kg/cm2) and temperature (220 deg C) for ejector vacuum pulling


. Once the rated parameters are reached open the steam valve of starting or hogger ejector . Observe the steam is vented to the atmosphere


⚫ Then open the ejector airline valve


• Observe vacuum inside the condenser increasing slowly and will reach 60 to 70% of rated vacuum within 20 minutes


SOP to put main ejector into line


• Ensure CEP is running


• Ensure cooling water inlet and outlet valves of


main ejector which is to be taken into line . Vent out air from water box of the ejector


• Then open the drain valve of inter condenser and after condenser of ejector


. Open the steam valve of after condenser ejector • Open the steam valve of inter condenser ejector


. Observe the condensate is drained out from both the condensers


Slowly open the air valve & observe the vacuum


is increasing


• When vacuum reaches rated, then stop the hogger or starting ejector
Vacuum killing or Taking out of main ejector


. Close the air valve of the ejector


. Close the steam valve of inter condenser


. Close the steam valve of after condenser


. Close the drain valves of after & inter condensers


. Close the cooling water inlet & outlet valve once the ejector is cooled