Filter Selection Guide
Let Schroeder Assist You in Selecting Your Filter
When considering a Schroeder process filter/strainer for your application, you can select from three basic designs:
- Back flush filters/strainers (automatic and manual) – Back flush filters/strainers cover a wide range of flows and filtration ratings. Some are automatic using electronics and pneumatics controlled by a PLC based panel. Others require an operator to manually back flush the filter/ strainer. The elements in each of the back flush filters/strainers are reusable.
- Bag filter/strainer systems – These filter housings come standard sizes 1, 2, 3 and 4. Size 2 multi-bag housings are available for higher flow applications. The filter bags are disposable and available in many types of felt and mesh. They are suitable for coarse and fine filtration.
- Cartridge filter/strainer systems – Cartridge elements utilize depth filtration to increase dirt holding capacity while offering efficient filtration. The elements are well suited for fine filtration. Housings for these elements are available in polypropylene for single cartridges and stainless steel for multiple cartridges, and rolling media filters/strainers for large dirt loads.
There are eight (8) main considerations in choosing the proper filter housing
- Fluid Compatibility – How will the materials of construction and seals for both the housing and element withstand the process medium?
- Materials of Construction
- Housing Construction – Carbon steel, stainless steel, polypropylene, brass and more.
- Seals – Buna, EPDM, Viton, Teflon® (a registered trademark of DuPont Dow Elastomers) and more.
- Filter Elements – see Element Selection Guide and Technical Data section, page 6, for more detailed information.
- Pressure Rating – The maximum sustainable working pressure of the system.
- Pressure Drop (loss) – How important is maintaining pressure rating and heat generation in the system?
- Process Connection Size – The process piping and specific requirements of the system determine these criteria.
- Filter Element Options – What is the desired pore size of the element and the requirements of the system (see Filter Element Selection).
- Overall Efficiency – based on filter element selection.
- Accessories – gauges, system monitoring, control panels.
- Economic Considerations
The model numbering selection chart on each product spread in the catalog will provide an easy method to fully define the product you need for your specific application.
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