What is the reason why the chemical filter fails soon after it is replaced?

A chemical filter that is less effective right after replacement may involve target gas mismatch, high inlet load, bypass, moisture, or measurement issues. Quality cannot be judged only by the number of days of use, nor should the same configuration be replaced repeatedly without investigation. It fails quickly after replacement, which usually means that a certain prerequisite is inconsistent with the actual working status of the new filter element.

First confirm whether the test data itself is comparable

If the outlet readings before and after core replacement are not taken under the same caliber, the failure judgment may not be established from the beginning. Changes in sampling location, sampling time, instrument calibration, and detection limits will make old and new data incomparable. Common situations are: measuring at the work station before changing the element, and measuring at the outlet of the filter element after changing the element, or testing in the shutdown state before changing the element, and measuring at full load after changing the element. You should first confirm that the methods, points and working conditions of the two tests are consistent before judging whether the filter element really fails. Regarding how to choose the sampling period, please refer toThere is a peculiar smell only when the machine is turned on. At what time should the gas be measured?。

Bypass and installation problems are more common than media failure

The new filter element is not very effective after being installed quickly. A large part of the reason is not the media, but the airflow does not pass through the filter layer as designed. Sealing gasket curling, insufficient compression, frame deformation, gaps between modules, and air leakage from access doors will all form bypasses, allowing untreated air to bypass the filter element. The characteristics of this type of problem are: the filter element itself may be tested normally, but the system outlet is always substandard. When troubleshooting, you should first check the installation status and sealing continuity before judging the medium. For frequently asked questions involving the installation of seals, please refer toHow to avoid damaging the sealing edge when installing a chemical filter?。

Inlet loads may have exceeded original design assumptions

If the process changes before and after the element is replaced, the gas composition or concentration faced by the new filter element may be different from the original configuration. Adding new cleaning agents, increasing production, adjusting exhaust air, and inputting pollution from adjacent areas will all change the inlet load. The capacity of the medium for the target gas is limited, and components that are not considered in the selection may penetrate quickly. In this case, the same filter element is replaced repeatedly, and the results are usually the same. The material list, production shifts and exhaust status before and after core replacement should be checked to confirm whether the inlet conditions have changed. For ideas on review of requirements after process adjustment, please refer toAfter the production process is adjusted, do the original chemical filtration requirements need to be rechecked?。

Moisture and storage conditions may affect actual performance

If the filter element gets damp before installation or during operation, it may change the state of the medium and reduce the effective capacity. Entrainment of droplets after the surface of the air-conditioning box is cooled, condensation near the humidification section, and the opening of the filter section to contact high-humidity air during shutdown are all common situations. In addition, long storage time, long-term exposure after unpacking, and damaged packaging during transportation may also affect the initial state of the new filter element. When changing the core, the unpacking and installation dates should be recorded, and the filter section should be checked for traces of moisture. Regarding the impact of high humidity environment on filter elements, please refer toDo chemical filter inspection intervals need to be shortened during high-humidity seasons?。

Aili industrial supporting equipment

The filter element will become ineffective soon after the filter element is replaced. We generally do not recommend customers to buy another batch of the same filter element. Instead, we should review the inspection records, installation photos and material changes before and after the filter element is replaced. Common problems are concentrated in three categories: seal bypass, inlet load change and moisture. Problems with the medium itself are not as numerous as expected. Aili Industrial can provide chemical filters and air supply equipment selection packages, covering FFU packages, box type, flat type and V-type products. If the original system involves replacing the imported filter element, the adaptation can be checked according to the interface size and media requirements; the interface issues between the filter section, the fan and the frame can be coordinated in the same package. Products can be viewedChemical filter product series page, box-type matching can be referred toMAU box-type chemical filter , FFU integrated configuration can be referred toChemical Filter FFU page. The specific gas effect, applicable environment and replacement cycle still need to be verified based on the corresponding configuration data and on-site working conditions. The actual results are subject to on-site leak detection and gas detection results.

Related questions and answers

The outlet of the newly replaced filter element exceeds the standard. Is there a problem with the quality of the filter element?
uncertain. First confirm whether the detection caliber is consistent, and then check the installation seal and bypass. Media problems are only one possible cause, bypass and measurement differences are more common.

The same filter element fails quickly after being replaced several times, what should I do?
Indicates that entry conditions or system status may have changed. Materials, air volume, temperature and humidity, and installation status should be reviewed instead of repeated replacements.

Can Aili Industrial help troubleshoot the failure problem after core replacement?
It can be combined with the inspection records before and after core replacement, installation status and inlet conditions to assist in troubleshooting to determine whether the problem lies in the media, sealing or system changes. Specific conclusions need to be confirmed based on on-site data.

Related articles

• After the chemical filter is partially penetrated, how to determine whether to replace the entire set or replace it in layers?

• Will gas handling capacity still be consumed after a chemical filter is shut down?

• Should chemical filters be tested in advance after experiencing a contamination peak?

• How long does it take for a chemical filter to be put into use after being unpacked?

Key points for selection and acceptance inspection