Cartridge Filters & Filter Bags for Dust Collectors

A cartridge filter is a pleated filter element used to capture dust and fine particulate from an industrial air stream. Its pleated construction provides a large filtration area within a compact housing, making cartridge collectors useful where fine dust capture and limited installation space are important.

A dust collector filter bag is a fabric filter element used inside a baghouse to separate dust particles from an industrial air stream. Filter bags are available in different materials and constructions to suit dust type, temperature, chemical exposure and operating conditions.

Cartridge filters can be a strong choice for fine and submicron particulate because their pleated media provides a high filtration area in a compact design. However, modern bag media can also provide excellent fine-particle filtration, so the final selection should consider dust loading, media construction and operating conditions.

Start with the airflow, dust type, particle size, dust concentration, operating temperature, moisture level and required emission limit. The cartridge’s filter media, dimensions, filtration area and cleaning compatibility should then be matched to the dust collector and application.

Common causes include:

• Excessive dust loading
• Incorrect filter sizing
• Dust blinding or poor dust release
• Moisture or sticky particles
• Inadequate pulse-jet cleaning
• Damaged or blocked filters
• Excessive air-to-cloth ratio
• Poor airflow distribution

A rising differential pressure should be investigated rather than simply increasing cleaning frequency.

 Filter bags should be replaced based on differential pressure, physical condition, emissions performance, cleaning performance and evidence of media deterioration. Operating conditions and correct filter selection have a major effect on service life.

Cartridge replacement depends on dust loading, operating hours, filter media, cleaning performance and differential pressure. Frequent replacement is often a sign that the system should be investigated for incorrect sizing, excessive dust loading, poor pulse cleaning or unsuitable media.

In some dust-collection systems, cartridges can be considered as a retrofit or replacement technology. However, the collector housing, available space, airflow, cleaning arrangement, filter area and dust characteristics must be evaluated before making the change. Cartridge filtration is particularly attractive where a higher filtration area is needed within a limited footprint.

Filter life can often be improved by:

• Correctly sizing the filtration area
• Maintaining the recommended air-to-cloth ratio
• Selecting media suited to the dust
• Maintaining adequate pulse-cleaning pressure
• Preventing moisture ingress
• Monitoring differential pressure
• Inspecting for leaks and damaged filters
• Maintaining proper airflow and dust discharge

The objective should be to correct the operating conditions.

Filter selection for high-temperature service depends heavily on the gas temperature and filter-media temperature rating. Specialized filter media may be required, and the temperature must be evaluated under both normal and upset conditions.