Duplex Basket Strainers

A Duplex Basket Strainer is a pipeline filtration device with two basket housings that allows continuous filtration while one basket is being cleaned or serviced. A changeover valve system diverts flow between the two housings without stopping the process.

Unlike simplex strainers that require process shutdown for cleaning, duplex strainers allow online maintenance. One basket remains in service while the other is cleaned, ensuring continuous operation in critical processes.

Fluid flows through one basket chamber where solid particles are trapped by the perforated or mesh basket. When the basket becomes clogged, the operator switches the flow to the second chamber using a changeover valve and removes the first basket for cleaning.

Common basket types include: • Perforated baskets – for larger debris removal • Wire mesh baskets – for fine particle filtration • Wedge wire baskets – for heavy-duty industrial applications

Common body materials include: • Carbon Steel • Stainless Steel (SS304 / SS316) • Duplex Stainless Steel Basket elements are typically made from stainless steel perforated sheet with wire mesh lining.

Pressure and temperature ratings depend on the design standard: • ANSI Class 150 / 300 / 600 • Temperature range: –20°C to 400°C (depending on gasket and material)

Duplex strainers are widely used in: • Oil & gas processing • Petrochemical plants • Power generation • Water treatment plants • Marine applications • Food & beverage processing • Chemical industries

The clean pressure drop is usually 0.05 – 0.2 bar, depending on: • Flow rate • Mesh size • Strainer size • Fluid viscosity Pressure drop increases as the basket accumulates debris.

Cleaning frequency depends on: • Contamination level in the fluid • Basket mesh size • Operating flow rate Many systems monitor differential pressure across the strainer to determine when cleaning is required.

Most duplex basket strainers are designed for horizontal pipeline installation to allow easy basket removal and maintenance.

Proper sizing depends on: • Pipeline diameter • Flow rate • Maximum allowable pressure drop • Filtration requirement (micron rating) • Fluid properties Engineers usually ensure the basket open area is 4–6 times the pipeline cross'sectional area.

Routine maintenance includes: • Cleaning or replacing baskets • Inspecting gaskets and seals • Checking changeover valve operation • Monitoring differential pressure

Yes. Duplex strainers are ideal for applications with continuous debris load, because operators can clean one basket without interrupting process flow. ? Pro Tip for Buyers: Always choose a Duplex Basket Strainer with at least 4–6 times the pipeline filtration area to reduce pressure drop and extend cleaning intervals.