en.Wedoany.com Reported - The 8,000 Nm³/h hydrogen-rich gas recovery unit constructed under the Huajin Project recently completed its intermediate handover, becoming the first unit to achieve mechanical completion (intermediate handover) during Liaohe Petrochemical's current plant-wide overhaul. Reaching this milestone has secured lead time for the subsequent startup and commissioning of the entire plant's units.

This Liaohe Petrochemical overhaul involves four core units: a 600,000-ton/year catalytic cracking unit, a 160,000-ton/year gas fractionation unit, a 600,000-ton/year continuous reforming unit, and the 8,000 Nm³/h hydrogen-rich gas recovery unit. Faced with a tight schedule, heavy workload, and extensive cross-operation, the hydrogen-rich unit project team has been advancing work according to the overhaul network plan and daily construction schedules since commencing on April 20. The project department focused on the critical path, coordinating manpower, machinery, and material resources to achieve seamless integration across all processes. From heat exchange equipment maintenance to vessel inspection, and from valve repair and replacement to controlled torque tightening, precise measures were implemented at every stage. Over a period of 20 days, this unit was the first among the four to accomplish its set objectives.

This overhaul involved the maintenance of 16 heat exchangers and 44 vessels; the repair of 36 valves and replacement of 80 valves; the completion of 502 controlled torque tightening points; and a total of 11 electrical and instrumentation maintenance tasks. A total of 533 quality acceptance forms were generated throughout the process, with complete documentation and records, ensuring that documentation was perfected in sync with the physical works.

During the overhaul, the project department implemented a "three-tier inspection system" of self-inspection, mutual inspection, and specialized inspection, controlling every procedure through online approval and on-site form submission and verification mechanisms. In terms of safety management, the site entry education and daily pre-shift meeting systems were enforced, strengthening the whole-process control of work at height, hot work, and confined space operations. Through routine hazard identification and closed-loop rectification, the entire overhaul process was conducted safely, smoothly, and under control, with no quality hazards or safety incidents occurring.

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