How to check if the ULPA frame is scratched or bumped? Injury risk and re-examination

Scratches or bumps on the ULPA filter frame should be judged based on the location, depth, deformation and sealing impact. Surface appearance problems and damage affecting glue joints, load-bearing or air tightness should be treated separately. The trouble with frame damage is that appearance and function are not necessarily proportional: a shallow scratch on a non-sealed surface may only affect the appearance; and an inconspicuous corner bump may have changed the squareness of the outer frame and the state of the glue seam. To determine whether and to what extent the damage needs to be treated, you cannot just look at 'whether it looks serious or not.' Aili Industry has factory inspection records for the flatness, squareness and glue seam status of the outer frame during the filter frame processing. When the frame is found to be damaged during the arrival inspection, it can be compared with the factory data to determine whether it was introduced during transportation or existed originally, so that the acceptance judgment can be based on data.

1. First mark the location of the damage: is it near the sealing surface, tank body and glue joint?

Photograph the whole and part of it, check whether it is located near the sealing surface, tank, corner or glue seam, and check the squareness of the outer frame and adjacent media.

Location determines impact. Scratches on the sealing surface may destroy the continuity of the fit. Bumps on the liquid tank body may change the depth of the groove and the fit of the knife edge. Bumps at corners are most likely to affect the squareness of the outer frame. For impacts near the glue seam, check whether the glue seam is cracked. Aili Industry isDuring the factory inspection of HEPA/ULPA filters , the status of the sealing surface, the integrity of the tank body, and the appearance of the glue joints are recorded. During acceptance, the scope of influence can be determined based on the location. The relationship between levels and filtering requirements can be found inISO cleanliness level comparison。

2. Judgment of functional impact: Seal surface depression, groove wall deformation and frame distortion should be treated differently

Seal surface dents, groove wall deformation and frame distortion may affect installation; minor scratches on ordinary non-functional surfaces should also be judged according to the agreed appearance requirements.

The depression of the sealing surface will affect the consistency of the compression of the seal. Even if the depression is very shallow, it may form a local non-fitting area; the deformation of the groove wall will change the matching relationship between the knife edge and the tank body, and the sealing effect of the liquid tank will be affected; the distortion of the frame will cause the entire filter element to be unevenly stressed when installed. Slight scratches on non-functional surfaces do not affect sealing and load-bearing, and can be judged according to appearance requirements. Aili Industry isDuring the factory inspection of liquid tank sealed ULPA filters , there is a special inspection on the cooperation between the tank body and the knife edge. Abnormalities in the tank wall found during acceptance can be judged by comparison. The relationship between sealing surface and structure can be referred toHEPA FAQs and Selection Guide。

3. The verification basis should be retained during processing: no flattening, polishing or touch-up paint without authorization

Do not knock, sand or touch up paint yourself without permission. After approving the rectification, review the size, sealing and required leak detection, and retain the acceptance conclusion.

The way frame damage is handled directly affects the subsequent state. Knocking flat may cause new stress deformation in the profile, grinding may change the height of the sealing surface, and touch-up paint may cover up cracks. Aili Industry isWhen a frame abnormality is encountered in a non-standard ULPA filter project, the treatment method will be judged from the profile structure and sealing surface status. If rectification is required, the approved plan will be implemented and the size and sealing will be reviewed. The original status of the damage, treatment method and re-inspection results will be retained in the acceptance record to form a complete basis. For the relationship between structural rectification and leak detection, please refer toULPA ultra-high efficiency filter FAQ and selection guide。

4. Even if the filter surface is intact after the corner is hit, check the glue seam and diagonal line.

When the corners of the frame are impacted, even if the filter surface is intact, the glue seams and diagonals should be checked. It is not advisable to just wipe the appearance. The impact energy will be transmitted along the profile. The corners are where the profile connections and glue seams are concentrated, and the squareness of the outer frame may also change as a result.

Aili Industry isULPA ultra-high-efficiency filters . During acceptance, the diagonal is measured after the corner is hit, and the diagonal can be compared with the factory data to determine whether deformation has occurred;There are measurement records for the diagonal or squareness during the factory inspection of The installation interface of the filter element matching the FFU fan filter unit is sensitive to alignment, and may cause local interference when it is installed after deformation. The relationship between squareness and installation cooperation can be referred toHEPA FAQs and Selection Guide。

5. Related questions and answers

Do I need to replace the filter element due to scratches?
Not necessarily, it should be judged based on the scope of damage, functional impact and acceptance rules, rather than just whether there are scratches.

The corner of the frame is hit, but the filter surface is intact. What else needs to be checked?
Glue seams and diagonals should be checked. Impact may affect profile joints and squareness, which may not necessarily be apparent externally.

Can damaged parts be installed first and then observed?
Damage involving sealing surface and structural deformation should be evaluated and treated before installation to avoid problems that require rework after installation.

6. Related articles

ULPA ultra-high efficiency filter FAQ and selection guide

Liquid tank seal ULPA ultra high efficiency filter

ULPA ultra high efficiency air filter

HEPA FAQs and Selection Guide

7. Key points for selection and acceptance inspection

8. Product matching and technical support from Aili Industrial

Aili Industry has factory inspection records for the flatness, squareness, sealing surface condition and glue seam appearance of the outer frame during the filter frame processing process.the HEPA/ULPA filter is found to be damaged when it arrives, it can be compared with the factory data to determine whether it was introduced during transportation or originally existed;When the frame of The liquid tank sealed ULPA filter has special inspections on the cooperation between the tank body and the knife edge before leaving the factory.ULPA ultra-high efficiency filters have measurement records of diagonal or squareness when leaving the factory.When a non-standard ULPA filter project encounters frame abnormalities, the processing method will be judged from the profile structure and sealing surface status. The acceptance record retains the original status, processing content and re-inspection results.The installation interface of the matching filter element of the FFU fan filter unit is sensitive to alignment and can be checked during acceptance. Provide process objectives, installation drawings, operating conditions and acceptance requirements, and can further communicate ULPA standard specifications, non-standard interfaces, samples and batch matching. The specific parameters and test range are based on the confirmed model and technical documents.