××Company’s gas generation unit shutdown and replacement plan

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××Plant shutdown and replacement plan for the company’s gas production unit: As scheduled by the company, a plant-wide shutdown for maintenance is planned for 10:00 on March 9th. This maintenance task is time-sensitive and involves significant workload; therefore, this plan has been prepared to ensure that the maintenance is completed safely and on schedule, with high quality and in full compliance with the requirements. I. Shutdown procedures: Upon receiving the shutdown command from the dispatch, the on-duty shift leader should organize personnel to first shut down the low-pressure steam systems of the second, third, and fourth sets; open the air vent valves of the steam drums. Following the shutdown procedures, ignite furnaces No. 5 through No. 16, and then shut down air blowers No. 3, No. 4, and No. 6, as well as oil pump stations No. 2, No. 3, and No. 4. After shutting down the pumps, close the inlet and outlet valves of the oil pumps, as well as the main coal supply valve. Support the upward-flow valves and chimney valves using angle iron, and install water seals at the inlet and outlet of the gas holder.

II. Purging procedures: Use the fourth set of systems to carry out inerting purging. Set the DCS system to the inerting mode. After sampling at the chimney of a single furnace and confirming that the samples meet the requirements, open the vent valve at the front of the gas holder to release the inert gas into the system. After sampling at the vent valve again and confirming that the samples are satisfactory, use a reverse flow method to drain the water seals of furnaces No. 1 through No. 12, as well as the vent valves of the scrubbers and the main gas pipeline, in order to carry out purging. Slowly close the inlet vent valve of the gas holder. After 10 minutes of purging, follow the shutdown procedures to safely shut down all four sets of systems. Finally, raise the water levels in the water seals of furnaces No. 1 through No. 16 to the overflow level. Inform the desulfurization team and the circulating water team to carry out safe shutdown procedures accordingly. III. Safety precautions: 1. Connect the power supply of the soft water pump to the emergency power supply; ensure that the liquid level in the soft water tank is appropriate, and that the liquid level in the jacketed vessel is within the specified range. 2. Ensure thorough replacement with no dead corners left. 3. Access to towers, tanks, and heights requires a **permit**. 4. A fire work permit must be obtained for any firework-related activity. 5. A safety helmet and work clothes must be worn when entering the maintenance site. 6. The duty personnel must remain at their posts to ensure the safety of the workshop’s property. Preparation (Process Supervisor): Review (Shop Supervisor): Approval (Production Manager): Gas Production Workshop, March 6, 2009