The Guangdong Institute of Special Equipment Inspection and Research (GD-IET) Zhuhai Branch recently completed the offline calibration and online inspection of nearly 700 safety valves on natural gas processing units at CNOOC's Gaolan Terminal and Hengqin Terminal.

By implementing a precise service model of "continuous operation over weekends without halting enterprise production," the institute has reinforced the "final line of defense" for the safe landing of deepwater natural gas from the South China Sea into the Guangdong-Hong Kong-Macao Greater Bay Area.

Strategic Importance of the Gas Hub

The Gaolan and Hengqin terminals serve as crucial gateways for deepwater natural gas from the South China Sea. They are responsible for receiving, processing, and transporting gas from fields including the "Deep Sea No.1," with the supply covering multiple cities in the Greater Bay Area, holding significant strategic importance for national energy security and regional energy supply.

Equipment within the stations, such as compressor units and dehydration and dehydrocarbonization units, are high-risk pressure vessels. Their supporting safety valves are critical for ensuring the safety and stability of the entire gas supply chain.

Customized Plans for Precise Needs

To ensure the safety of this key energy infrastructure while minimizing the impact of inspections on normal production, the Zhuhai Institute dispatched specialized technical personnel to proactively engage with the enterprise's needs. They tailored a "one enterprise, one policy" calibration plan to meet specific requirements.

Staggered Operations and Online Inspection

Inspection personnel voluntarily worked on weekends, staying on-site to perform overtime tasks. Leveraging advanced online calibration technology, they conducted inspections on in-service safety valves that met the conditions without requiring the equipment to be shut down.

To address the issue of traditional offline calibration for large-diameter safety valves—where the disassembly, reassembly, and transportation of a single unit could take days, leading to production losses—the Zhuhai Institute synchronized its work with production schedules. They utilized the gaps between unit rotations to perform batch disassembly and reassembly for safety valves requiring offline calibration.

Strict Quality Control and Immediate Repair

During the calibration process, technicians verified the set pressure, sealing performance, and opening and closing pressure differential for each valve. For multiple safety valves with minor internal leaks, they performed online grinding and repair, restoring them to sealing standards. This ultimately achieved a 100% pass rate for all safety valves.

Looking ahead, the Zhuhai Institute will continue to uphold its responsibility as a "safety guardian." While protecting the national energy artery, it aims to alleviate burdens and reduce costs for enterprises through professional technology, achieving a win-win outcome for both safety assurance and production efficiency.

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