What is a double-pressure seal? How is it used in China? ? ?

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The use of dual-seal systems is increasing steadily. For many years, single-seal systems have been the preferred choice for refineries and petrochemical companies in North America, but the industry is now shifting towards dual-seal systems. Fuchs Corporation found that since 2010, the ratio of dual-sealing used in hydrocarbon applications in North America has increased by 7% to around 50%. Based on current trends, it is estimated that within 15 years, 80% of new and upgraded hydrocarbon applications will adopt dual sealing. However, due to various factors, the adoption rate of dual sealing is expected to increase in the next decade. The dual-seal comes in both non-pressurized and pressurized configurations. Although double non-pressure seals are popular in the United States, refineries in Europe, the Middle East, and Southeast Asia prefer double pressure seals. In fact, in most new buildings in these areas, most double-sealing applications are double-pressure sealing. Why are more and more companies preferring dual-pressure sealing? The main reasons are that they can prevent emissions from leaking into the atmosphere, are usually more reliable (especially during high-temperature processes), provide improved resistance to fluid circulation, and allow for lower operating temperatures compared to unpressurized double seals. Although the installation cost of dual sealing is high, it can result in significant cost savings over its lifetime, mainly for the following reasons: reduced utility costs. Dual-pressure sealing can be paired with separate cooling and pressurization systems, thereby significantly reducing the costs of cooling water and utilities. Compared to the single-seal and pressure-free double-seal types with external flushing on the process side, the operating costs are significantly reduced. Reduce the frequency of inspections. Compared to single-seal and double-pressure-free seals, double-pressure seals can reduce the number of emissions and leakage inspections, thereby lowering inspection costs. Improve compliance. Dual pressure sealing prevents emissions from leaking into the atmosphere, thereby helping factories to better comply with strict **regulations and avoiding fines from the EPA and LDAR. As more American companies realize the advantages of using dual sealing, its adoption rate in the industry will continue to rise. The demand for high-pressure seals is increasing. For decades, in order to optimize the reliability of seals, customers in the refinery and petrochemical industries have sought seals that can meet, but not exceed, the normal operating conditions of the pumps. However, today there is growing interest in high-pressure seals that can operate at the maximum allowable operating pressure of the pump. Refineries and petrochemical plants typically require high-pressure seals to handle situations where the surface velocity reaches 45 meters per second (150 feet per second), and the dynamic pressure in the sealing chamber reaches 103 bar (1500 pounds per square inch). The static pressure reaches 207 bar (3000 psi). By leveraging these properties, it is possible to reduce the risk of seal failure under pressure disturbances, improve reliability in operation with various fluids, and enable refineries and petrochemical plants to meet increasing environmental requirements. Trend: Stricter compliance with API682. An increasing number of refineries and petrochemical plants wish to reduce exposure risks, and therefore adhere strictly to the API682 standards. Today, the vast majority of refineries and petrochemical customers supply equipment that complies with API682 in standard packaging. This growing dependence means that the original equipment manufacturers of rotating equipment must ensure that their product portfolio includes a variety of products that meet the API682 standards. OEMs must also take into account the additional requirements of new products, raise design standards, and provide training to meet customer expectations. Although the API682 standard was developed specifically for refineries and the petrochemical industry, companies in the chemical, piping, and other industries now rely on it to design their facilities.