Selection and Precautions for Wound Filter Cartridges

Selection Steps

 1. Determine the Filter Medium

Clarify the chemical properties of the liquid to be filtered (acid, alkali, solvent, water, oil, etc.).

Select the appropriate filter cartridgematerial according to the chemical compatibility chart (PP is the general first choice if unsure).

2. Determine the Filtration Rating

Determine based on the cleanliness requirements of downstream equipment or products. For example, 5 μm for protecting precision nozzles, and 25–100 μm for pre-treatment.

Note: The rating of wound filter cartridges is nominal rating, indicating the removal efficiency (e.g., 90%–98%) for particles of a specified size, rather than absolute rating.

3. Determine Operating Conditions

Operating temperature: Ensure the cartridge material can withstand long-term exposure.

Operating pressure: System pressure must be within the bearing range of the cartridge.

4. Determine Flow Requirements

Select cartridges of suitable size (length and quantity) according to the system flow rate, and ensure the initial pressure drop is within a reasonable range.

5. Confirm the Connection Type

Check whether the end cap connection (such as flat end, 222/226 insert, threaded connection) matches the filter housing.

Precautions

1. Chemical compatibility is the primary prerequisite:

Incorrect material selection will cause cartridge dissolution, softening or fluid contamination, resulting in system failure.

2. Pre-flushing is mandatory:

New cartridges may contain a small amount of loose fibers and impurities from production. After installation, flush with clean liquid at low pressure until the effluent is clear.

3. Monitor pressure drop:

As impurities accumulate during use, the pressure drop will gradually rise. Replace the cartridge in time when the pressure drop reaches the manufacturer’s recommended maximum (or when flow drops significantly), to avoid cartridge collapse or bypass.

4. Avoid dry operation:

For cartridges made of certain materials (e.g., cotton yarn), direct high-pressure fluid flow without pre-wetting may damage the fiber structure.

5. Non-reusable & non-backwashable:

Yarn filter cartridges are for single use only. Deeply trapped impurities cannot be completely removed by backwashing; forced backwashing will damage the filter layer structure.