In industrial sectors like chemical processing, petroleum refining and food production, tank lid packing serves as a critical sealing component, preventing medium leakage, ensuring production stability and avoiding safety risks and environmental pollution. A key question for industry professionals is the maximum temperature and pressure this packing can withstand, as it directly impacts tank equipment safety, efficiency and service life.
The temperature and pressure resistance of tank lid packing is not fixed, but determined by its material, structure and working environment. Common materials include graphite, PTFE, asbestos (phased out for environmental reasons) and synthetic fibers. Graphite-based packing boasts excellent heat resistance, withstanding -200°C to 600°C; high-purity variants can work stably above 800°C under inert gas, ideal for high-temperature tanks. PTFE packing has a moderate range of -180°C to 260°C, suitable for corrosive medium tanks. Aramid synthetic fiber packing resists -100°C to 300°C, fitting general industrial tanks.
For pressure-bearing capacity, graphite and metal-reinforced packing perform best, enduring 30–50 MPa for high-pressure vessels in petroleum and chemical industries. PTFE packing handles 10–25 MPa, for low-to-medium pressure equipment. Notably, pressure resistance drops by 30%–50% when temperature nears the material's upper limit.
Working medium also affects performance-corrosive substances like strong acids can degrade packing even if it has high temperature and pressure resistance. Experts advise selecting packing based on actual conditions, including temperature and pressure fluctuations, medium type and service life demands, along with proper installation and regular maintenance.
As industrial technology advances, manufacturers develop new materials like composite graphite packing to boost resistance, offering more reliable sealing solutions for harsh working environments. In short, enterprises should choose tank lid packing tailored to their needs to ensure safe and efficient tank operation.
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