Pressure vessels in industries such as chemical, energy, and pharmaceuticals operate under complex conditions of high temperature, high pressure, or corrosive media for extended periods. Their leakage prevention performance directly affects production safety and environmental protection. Effective leakage prevention design can not only improve equipment reliability but also reduce maintenance costs and operational risks. Therefore, a systematic analysis of factors affecting leakage prevention during the pressure vessel design phase is of great significance. FRHE has extensive engineering experience and technical expertise in this area.

Firstly, material selection is one of the key factors affecting leakage prevention performance. Shell and sealing materials must possess sufficient corrosion resistance, high-temperature resistance, and stress cracking resistance. If the medium is acidic, alkaline, or contains chloride ions, alloy steel or corrosion-resistant stainless steel should be selected to avoid leakage caused by material thinning due to corrosion or intergranular corrosion. Meanwhile, the gasket material must be selected based on the characteristics of the medium. For example, flexible graphite is suitable for high-temperature and high-pressure scenarios, while PTFE is more suitable for corrosive media environments.

Secondly, structural design has a decisive impact on the sealing effect. As the most common sealing interface, the flange structure's design parameters, such as sealing pressure, bolt preload distribution, and flange rigidity, directly affect the reliability of the seal. The design should avoid insufficient rigidity or uneven stress, which could lead to insufficient gasket compression and micro-leakage. Furthermore, for high-pressure vessels, self-tightening sealing structures can be used to increase contact surface pressure and enhance sealing reliability. FRHE often uses finite element analysis to optimize contact stress distribution in practical engineering, effectively reducing the risk of leakage.

Thirdly, manufacturing precision is also a crucial factor affecting leak prevention. The roughness of the sealing surface, flange machining accuracy, and welding quality all significantly affect the final sealing performance. Scratches or excessive surface waviness on the sealing surface will prevent the gasket from fully fitting, creating a leakage path. In addition, internal weld defects such as porosity and slag inclusions can also become potential leakage hazards. Therefore, high-standard welding processes and non-destructive testing are necessary conditions to ensure quality. Finally, changes in operating conditions also have a long-term impact on leak-proof performance. Cyclic changes in temperature and pressure lead to thermal expansion and contraction, causing gaskets to loosen and bolt preload to decrease, thus reducing sealing effectiveness. Therefore, stress compensation structures or highly resilient sealing materials must be considered in the design to ensure long-term stable operation of the equipment.

Overall, the leak-proof performance of pressure vessels depends on a variety of factors, including materials, structural design, manufacturing precision, and matching with operating conditions. Only through comprehensive optimization during the design and manufacturing stages can the safe and reliable operation of the equipment be ensured.