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Generator Air Tightness Test Period Of Test= 24 Hrs without a Break Air Pressure Drop (Allowed in 24 Hrs) : <=0.15 ksc Air Test Pressure = 3.5 ksc All LLDs Drain Closed. Ensure Seal Oil system in Operation Seal Oil DP >1.5 ksc AS Seal Oil Pr>4.5 ksc, start H2S Seal Oil system H2 Cooler Isolated PW in Winding is in filled condition, Winding Isolated. PW also kept Isolated. PW Tank at Atmospheric Pressure Ensure availability of  Instrument air and Bleed Out moisture from it by keeping it open till  Connect flexible air hose with the gas plant through the coupling and ensure no air leakage is there  The filling is to be done by opening the valves in the normal H2 filling line where as the valve from H2 rack side will remain closed. Once the air filling is commenced the test record data sheet   The air valve is to be opened full. While pressurising the LLD / Seal oil DP / Seal oil parameters are to be recorded as per the enclosed sheet. The...

P re – start checks   ( For air side seal oil PPS ) Turbine lube oil system is in service. Seal oil storage tanks level is normal ( low level alarm not persisting ) Ensure that following valves are open :---- Shut off valve from seal oil storage tank at oil canal. Shut off valves before seal oil Pumps ( air side ) Shut off valves after seal oil Pumps ( air side ) Shut of valves before and after DPR valves Shut of valve before float valve in oil inlet to seal oil tank. Shut off valve after float valve in oil drain line from SOT Shut off valves after flow indicators of air side, H2 side and ring relief seal oil at 8.5 m rack. Air side and H2 side seal oil signal to pr. Equalizing valve at 8.5 m rack. Ensure venting of air side seal oil cooler and filters. Ensure cooling water is available for seal oil coolers. Ensure root valves of all instruments are open at “O” m & 8.5 m Ensure interconnectin...