CHECK LIST-VACUUM PULLING UNIT: DATE: SL NO ITEM DESCRIPTION STATUS
1. Fill Hot well up to normal level.
2. Vacuum pumps are ready for operation.
3. Turbine gland area is clean and loose debrises are removed.
4. One gland seal steam exhauster is kept in service.
5. One CEP is kept in service and condensate flow is established through GSC minimum recirculation.
6. Gland steam pressure control valve and Leak off control valves operation checking is complete. Oil level is OK in hydraulic actuators.
7. Charging of cooling water to condenser water boxes.
8. Control oil is charged.
9. Vacuum breaker valve operation checking is done.
10. TG set is on barring gear with interlocks & protections checked
11. Line up seal steam supply and gland steam cooler.
12. Start both vacuum pumps and observe vacuum.
13. After achieving about 0.2 kg/cm2 vacuum, charge seal steam to turbine glands.
14. Downstream parameters to be maintained are: Pressure: 35mbar and temp > 1600C.
15. Check system for air ingress points if proper vacuum is not achieved and same shall be rectified.
16. Stop one vacuum pump when desired vacuum is achieved and stabilised, However, if with one vacuum pump, vacuum is not holding then check for air ingress and attend the leakages
. 17. After achieving the required vacuum, stop both vacuum, pumps and record the rate of fall of vacuum. The rate of fall of vacuum should be 2 to 3 mm of Hg per minute.
18. Total hogging time taken for achieving full vacuum shall be noted after attending leakages.
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