What are the tips for choosing a wedge wire filter tube?

Apr 30, 2025

When selecting a wedge wire filter tube, you need to consider the filter media characteristics, working conditions, installation environment, and cost-effectiveness. Here are the key tips and steps:

Clear filtration requirements

Filter accuracy (gap size)

Choose the gap width according to the size of the particles to be intercepted (e.g., 0.1~0.5mm is commonly used for sewage treatment, and 0.1~0.3mm is required for sand control in oil wells).

Note: The smaller the gap, the lower the flux, and the filtration effect and flow rate need to be balanced.

Flow requirements

Calculate the required flow of the system to ensure that the flux (unit area flow) of the wedge wire filter tube matches to avoid excessive pressure difference.

Material selection (corrosion resistance and strength)

Stainless steel series

304 stainless steel: general type, suitable for neutral water quality or weak corrosion environment.

316/316L stainless steel: resistant to chloride ions and acids, and alkalis, used for seawater and chemical wastewater.

Duplex steel: high strength, corrosion resistance, suitable for extreme environments (such as high salt and high temperature).

Special materials

Titanium alloy: resistant to strong acids and alkalis, used in chemical or seawater desalination.

Plastic (PP/PVDF): corrosion-resistant and low-cost, suitable for food or weak acid environments.

Surface treatment

When anti-adhesion (such as grease, sticky particles) is required, polishing or coating (such as epoxy resin) can be selected.

Structural design

Gap shape

V-shaped narrow outside and wide inside: anti-clogging, easy backwashing (recommended for high impurity loads).

Rectangular gap: larger flux, suitable for low-viscosity liquids.

Support structure

Reinforcement ribs or cage frame: High-pressure or deep well applications require enhanced deformation resistance.

Open design: easy to clean and maintain (such as sewage treatment plants).

Connection method

Flange, thread, or clamp connections need to match the pipeline system (such as the API standard thread commonly used in oil wells).

Working condition adaptability

Temperature and pressure

High temperature (>200℃) requires the use of heat-resistant alloys or special welding processes.

High-pressure environment (such as oil wells) requires verification of the pressure-bearing capacity of the pipe body (such as the API 11D1 standard).

Abrasive media

When containing hard particles (such as ore pulp), choose thickened wedge wire or wear-resistant coating (such as tungsten carbide).

Viscous media

For materials that are easy to adhere (such as sludge), it is recommended to choose a large gap + self-cleaning design (such as a rotary filter tube).

Convenience of installation and maintenance

Modular design: Quickly replace damaged units (such as multi-section combined screen tubes).

Flushing interface: Reserve backwashing ports or air blowing interfaces to reduce downtime for cleaning.

Detachability: Consider space limitations and choose split or flexible connection designs.

Cost optimization

Life cycle cost: In highly corrosive environments, expensive but durable materials (such as titanium) can be selected to reduce replacement frequency.

Customization: When purchasing in bulk, it may be more economical to customize non-standard sizes (such as special diameters or gap gradient distribution).