Seal Oil system Charging

Pre – start checks 

(For air side seal oil PPS)

  1. Turbine lube oil system is in service.
  2. Seal oil storage tanks level is normal ( low level alarm not persisting )
  3. 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.
  1. Ensure venting of air side seal oil cooler and filters.
  2. Ensure cooling water is available for seal oil coolers.
  3. Ensure root valves of all instruments are open at “O” m & 8.5 m
  4. Ensure interconnecting valve to H2 side seal oil system is close.
  5. Gen. Brg. Exhaust fan is in service.
  6. By pass valve of float valve in oil drain line from SOT is close.
Pre – start checks 
(For H2 side seal oil Pumps)
  1. Air side seal oil circuit is in operation.
  2. Air side seal oil pr. > 4.5 Ksc at 8.5 m.
  3. Seal oil Tanks level is adequate.
  4. Ensure that following valves are open
  • H2 side seal oil Pump suction valve.
  • H2 side seal oil Pump discharge value.
  • Manual isolating value after DPR valve
  • Isolating valve before H2 side seal oil cooler.
  1. Ensure proper venting of H2 side seal oil coolers and filters.
  2. Ensure cooling water is available for seal oil coolers.
  3. Ensure that manual isolating valve in H2 side seal oil Pump discharge header for seal oil storage tank is close. 
ROUTINE CHECKS FOR SEAL OIL SYSTEM

  1. Air side and H2 side seal oil pumps discharge pr. is ( 10 1) Ksc
  2. Air side and H2 side seal oil temp in the range of 35 to 40C
  3. Air side and H2 side seal oil filters are not chocked.
  4. SOT level is normal
  5. Inter connecting valve between H2 side and Air side seal oil circuits is close.Inter connecting valve in between DPR valves is close
  6. Stand-by pump is lined up and not rotating in reverse direction.
  7. Seal oil flow and pressure is adequate in air side, H2 side and ring relief supply line at 8.5 m rack.
  8. Air side seal oil / H2 gas differential pr. is 1.3 to 2 Ksc
  9. H2 side and air side seal oil DP at seals is 10-20 mbar.
  10. Gen. Brg. Vapour exhaust fan is running and ensure vapour is coming out to atmosphere.
  11. Ensure no oil in LLD ( Liquid Level Detector)
  12. By-pass valve of float in oil drain line from SOT is close. 

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