How to select the right industrial filter？Principles and requirements for filter selection

Industrial filters are essential components in fluid systems, designed to remove solid particles from liquids, ensuring the protection and smooth operation of downstream equipment such as pumps, valves, and instrumentation. Selecting the right filter involves understanding both the application requirements and system constraints. In this article, we break down the five key principles for filter selection to help you choose the most suitable product for your process.

1.Filter Inlet and Outlet Size (Connection Diameter)

The filter’s inlet and outlet diameter should generally match the pipe size of the system. Specifically, the inlet size should not be smaller than the inlet of the associated pump, to avoid unnecessary flow restrictions. Matching the pipeline diameter ensures consistent flow and reduces the risk of pressure drops.

2.Pressure Rating

The nominal pressure rating of the filter must meet or exceed the maximum pressure that may occur within the pipeline system. This ensures the filter can withstand pressure surges without deformation or failure. Pressure class should be selected according to the system’s operating pressure and any potential peak loads.

industrial filter

3.Mesh Size Selection (Filtration Degree)

The mesh size determines the filter’s ability to trap particles. This should be chosen based on the smallest particle size that must be removed to meet process requirements. Different applications demand varying levels of filtration precision—e.g., finer mesh for sensitive instrumentation, coarser mesh for general equipment protection.

Example:

A 100 mesh screen can filter particles of approximately 150 microns.

For applications requiring ultrafine filtration, stainless steel woven wire mesh with 300+ mesh count may be used.

4.Filter Material Selection

The material of the filter should match the material of the pipeline or be compatible with the fluid media. Material selection depends on the chemical and temperature resistance required:

Cast iron – suitable for low-pressure water systems

Carbon steel / low alloy steel – commonly used in oil, gas, and steam applications

Stainless steel (e.g., 304, 316) – ideal for corrosive fluids and hygienic environments

Special alloys – required for highly corrosive or high-temperature services

5.Pressure Loss Calculation

Filters introduce minor pressure losses into the system. For water filters operating under standard flow conditions, the pressure drop is typically between 0.52 and 1.2 kPa. Calculating pressure loss helps in ensuring the system maintains adequate pressure levels after installation.

Final Thoughts

By following these five selection principles—matching connection size, ensuring correct pressure rating, choosing appropriate mesh size, selecting the right material, and understanding pressure loss—you can significantly improve the efficiency and reliability of your pipeline system.

At Haihao Group, we offer a wide range of industrial filters, strainers, and pipeline components tailored to your process needs. Whether you require carbon steel Y-type strainers, stainless steel inline filters, or custom filtration solutions, we ensure every product meets international standards and specific customer requirements.

Contact us to learn more about our filter selection or request a quote based on your system specifications. Email:sales@haihaogroup.com

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