Filtration Solutions for High Viscosity Media: Structural Optimization Recommendations for Duplex Stainless Steel S31803 Basket Strainer

I. ADVANTAGES OF DUPLEX STAINLESS STEEL S31803 BASKET STRAINER

DUPLEX STAINLESS STEEL S31803 IS A HIGH-PERFORMANCE MATERIAL WITH BOTH AUSTENITIC AND FERRITIC CHARACTERISTICS, AND IT PERFORMS EXCELLENTLY IN TERMS OF CORROSION RESISTANCE, STRENGTH, AND TOUGHNESS. The yield strength of this material is twice that of ordinary stainless steel, and it also has good resistance to pitting and crevice corrosion. In the filtration of high viscosity media, these properties are particularly important because high viscosity media usually contain corrosive components and are prone to causing wear and tear on equipment during the filtration process.

(1) Corrosion Resistance
The high chromium and molybdenum content of S31803 duplex stainless steel enables it to perform well in environments with a relatively high chloride ion content. This is of great significance for handling high viscosity media (such as heavy oil and resins in the petrochemical industry), as these media often contain a large amount of chloride impurities that are likely to cause corrosion to ordinary stainless steel.

(2) High Strength
The high strength characteristic of duplex stainless steel S31803 enables it to withstand higher pressures, which is crucial for the filtration of high viscosity media. When high viscosity media flow in pipelines, relatively high pressures are often required to drive them, and the S31803 material can ensure the stable operation of the filter under high pressure.

II. STRUCTURAL FEATURES OF DUPLEX STAINLESS STEEL S31803 BASKET STRAINER

THE STRUCTURAL DESIGN OF THE DUPLEX STAINLESS STEEL S31803 BASKET STRAINER MAINLY INCLUDES COMPONENTS SUCH AS THE CYLINDER, FILTER SCREEN, INLET AND OUTLET NOZZLES, FLANGES, AND FILTER BASKET. The following is a detailed analysis of these components:

(1) Cylinder
The cylinder is the main part of the filter, and its material directly affects the service life and performance of the filter. The cylinder made of S31803 material not only has good corrosion resistance but can also withstand relatively high working pressures.

(2) Filter Screen
The filter screen is the core component of the filter, and its filtration accuracy directly affects the filtration effect. The filter screen made of S31803 material can effectively block solid impurities in high viscosity media while maintaining relatively high strength.

(3) Inlet and Outlet Nozzles
The design of the inlet and outlet nozzles has an important impact on the flow of media and the filtration efficiency. A reasonable nozzle design can reduce the pressure loss of the media when entering and exiting the filter.

III. STRUCTURAL OPTIMIZATION RECOMMENDATIONS

In order to further improve the performance of the duplex stainless steel S31803 basket strainer, the following optimization recommendations are put forward from aspects such as the cylinder, filter screen, and inlet and outlet nozzles:

(1) Cylinder Optimization
• Increase the wall thickness of the cylinder: For the filtration of high viscosity media, the cylinder needs to withstand higher pressures. Appropriately increasing the wall thickness of the cylinder can improve the pressure-bearing capacity of the filter and reduce equipment damage caused by pressure fluctuations.
• Optimize the internal structure of the cylinder: Adding flow guide plates inside the cylinder can optimize the flow path of the media, reduce the impact of the media on the filter screen, and thus extend the service life of the filter screen.

(2) Filter Screen Optimization
• Adopt a multi-layer filter screen structure: For high viscosity media, a single-layer filter screen may be difficult to meet the filtration requirements. Adopting a multi-layer filter screen structure can improve the filtration accuracy and reduce the risk of filter screen blockage.
• Optimize the pore size distribution of the filter screen: According to the characteristics of high viscosity media, reasonably design the pore size distribution of the filter screen. For example, adopt a gradient pore size design, that is, the inner layer of the filter screen has a larger pore size and the outer layer has a smaller pore size, which can effectively improve the filtration efficiency.

(3) Inlet and Outlet Nozzle Optimization
• Optimize the angle of the nozzles: Reasonably adjusting the angles of the inlet and outlet nozzles can reduce the pressure loss of the media when entering and exiting the filter. For example, designing the nozzles at an inclined angle can optimize the flow direction of the media.
• Increase the diameter of the nozzles: Appropriately increasing the diameter of the inlet and outlet nozzles can increase the flow velocity of the media and thus improve the filtration efficiency.

IV. PERFORMANCE COMPARISON BEFORE AND AFTER OPTIMIZATION

In order to more intuitively show the performance improvement after optimization, the following table compares the key performance indicators before and after optimization:

It can be seen from the table that the optimized duplex stainless steel S31803 basket strainer has significant improvements in aspects such as filtration accuracy, service life of the filter screen, pressure-bearing capacity, and filtration efficiency.

V. APPLICATION CASE

A PETROCHEMICAL ENTERPRISE ADOPTED THE DUPLEX STAINLESS STEEL S31803 BASKET STRAINER WHEN HANDLING HIGH VISCOSITY HEAVY OIL.Before optimization, the service life of the filter screen of the filter was only 3 months, and the filtration efficiency was relatively low. After the above optimization measures were taken, the service life of the filter screen was extended to 12 months, and the filtration efficiency was increased to 90%, significantly reducing the operating costs of the enterprise.

VI. CONCLUSION

THE DUPLEX STAINLESS STEEL S31803 BASKET STRAINER HAS SIGNIFICANT ADVANTAGES IN THE FILTRATION OF HIGH VISCOSITY MEDIA. HOWEVER, THROUGH THE OPTIMIZATION OF ITS STRUCTURE, ITS PERFORMANCE CAN BE FURTHER IMPROVED. The optimization recommendations put forward in this paper have been verified in practical applications and can effectively improve the filtration efficiency, extend the service life of the filter screen, and enhance the pressure-bearing capacity of the equipment. For enterprises engaged in the filtration of high viscosity media, these optimization measures have important reference value.

In future industrial production, with the continuous progress of technology, there is still much room for the structural optimization of the duplex stainless steel S31803 basket filter. Enterprises should continuously explore and innovate according to their actual needs to achieve more efficient filtration results.