System shutdown maintenance tasks and schedule table

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Schedule for System Shutdown for Maintenance on *Month*, 2011 – Item Sequence, Department Responsible, Category, Pre-maintenance Conditions, Start Time, Completion Time, Maintenance Duration (hours), Performing Unit, Person in Charge of Performing Unit, Result Confirmation
1. Replacement of gaskets on the flanges before and after EV2001; gasification Unit A – shutdown for venting
2. Replacement of gaskets on the steam seal cap of E2001; gasification Unit B – shutdown for venting
3. Maintenance of valves in the steam pipeline leading to the flare stack at V1502; gasification Unit A – 1.27 MP steam supply stopped
4. Welding to repair leaks in the steam pipeline leading to the flare stack; gasification Unit B – 1.27 MP steam supply stopped or the main valve at Yamashita closed
5. Replacement of elbows in the high-pressure nitrogen pipeline used for pressure equalization in Furnace A; gasification Unit A – furnace shutdown, oxygen pipeline pressure reduced
6. Disassembly and inspection of check valves at the outlets of C1201A/B; gasification Unit A – synthesis compressor shutdown
7. Modification of the reflux pipeline in P1406 to address vibration issues; gasification Unit B – furnace shutdown
8. Inspection and treatment of overheating problems in the front bearing of Mill B; gasification Unit B – furnace shutdown
9. 10. 11. 12. 13.
Note: Category A: Items that must be addressed during maintenance； Category B: Items that must be addressed to the greatest extent possible during maintenance ； Category C: Items that can be handled during operation; it would be better to deal with them during this maintenance period.