How to define the acceptance scope of ULPA equipment? Filter element, box and process area boundary

Device sideThe acceptance of ULPA filters should separately define the filter element, box installation system and process protection zone. Suppliers and equipment manufacturers need to clarify their respective delivery boundaries, test conditions and responsibility interfaces. The most feared thing about equipment acceptance is that the boundaries are blurred: the filter element is qualified but the box has a bypass, the box is sealed well but the air flow organization in the process area is unreasonable, the filter element manufacturer says I only care about the filter element, and the equipment factory says you have to ensure the overall effect. If the boundaries are not clearly written, it will be easy for everyone to have their own opinions during the acceptance inspection. Aili Industry also provides filter elements andThe acceptance content of the EFU equipment end fan filter unit , filter element, box installation and process protection zone can be divided by layer within the same system, and the test items and judgment basis of each layer are clearly defined during delivery.

1. Draw the boundaries on the equipment diagram: mark the filter element, installation seal, box and protection zone respectively.

Mark the filter surface, installation seal, box connection and protected area, and indicate whether the fan, air duct and exhaust are included in this supply.

The acceptance boundary is not an abstract concept and must be drawn on the equipment diagram. Where does the filter element body end, whether the installation sealing surface belongs to the filter element side or the box side, whether the box connection and the fan are in the same scope of supply, and who is responsible for verifying the process protection zone. These should be clearly marked on the drawings, and there will be evidence to rely on during acceptance. Aili Industry isWhen the EFU equipment end fan filter unit is matched, the supply boundary description can be provided according to the project requirements. The interface positions of the filter element, box and each layer of the complete machine are marked in the structure diagram. The relationship between levels and filtering requirements can be found inISO cleanliness level comparison。

2. Set up corresponding items for each layer: the verification contents of filter element, installation system and process area are different.

The filter element focuses on specified filtration performance, the installation system focuses on integrity and air supply, and the process area also needs to check particles, airflow, and equipment status. Qualifications at different levels cannot be presumed from each other.

The factory inspection of the filter element verifies the performance of the filter element body under standard conditions; the installation system leak test verifies whether the sealing interface is effective after the filter element is installed in the box; the process protection zone verifies whether the particles and airflow in the protection area meet the process requirements under actual operating conditions. The objects and conditions of the three-tier verification are different, and qualification of any one layer cannot replace other layers. Aili Industry isHEPA/ULPA filters provide filter element factory testing data when delivered.The ULPA ultra-high-efficiency filter report corresponds to a single unit according to the serial number, and the box installation leak detection and process area verification are performed on the equipment side according to project requirements. The division of labor at each layer of verification can be referred toHEPA FAQs and Selection Guide。

3. Agree on installation and final confirmation: the relationship between factory testing and on-site testing must be clearly written

Explain the relationship between factory testing and on-site testing, and retain the serial number, equipment location and operating settings to avoid multiple parties testing a part but missing the connection interface.

The factory test is completed under standard conditions, and the on-site test is completed under actual installation conditions. The test conditions of the two are different, and the results cannot be directly converted. The items should be clearly stated in the agreement: which items are covered by factory testing, which items are covered by on-site testing, and who confirms the connection interface. Aili Industry isIn the non-standard ULPA filter project, the division of labor between factory and on-site testing can be agreed upon according to the agreement.The FFU computer group control system records the location and operation settings of the equipment to facilitate comparison with factory data during on-site testing. For the conditions of on-site testing on the equipment side, please refer toEFU FAQ and technical support。

4. When the filter element manufacturer only delivers the filter element, the box bypass will be verified by the complete machine project arrangement

When the filter element manufacturer only delivers the filter element, the bypass of the equipment box must be verified by the complete machine project arrangement, and the inspection cannot be ignored because the responsibilities are not clearly stated. The impact of box bypass is as direct as the impact of leak detection on the filter element body, but the responsibility may be different.

Aili Industry isWhen the EFU equipment end fan filter unit is equipped with a complete machine, the box sealing and installation leak detection are within the scope of delivery of the complete machine and must be confirmed during acceptance. If the project only purchases filter elements, the factory leak detection of the filter elements will cover the filter element body, and the bypass verification on the box side will be arranged by the complete machine party according to the equipment acceptance requirements. The scope of supply is different, and the division of labor for acceptance is also different. This needs to be clarified at the procurement stage. For the inspection method of box bypass, please refer toHEPA FAQs and Selection Guide。

5. Related questions and answers

Can the filter element material be saved if the cleanliness of the whole machine is qualified?
It cannot be automatically omitted, and the delivery materials and verification at each level should be provided in full as agreed.

The filter element manufacturer only delivers the filter element, who is responsible for the sealing of the box?
The complete machine project shall arrange verification according to the equipment acceptance requirements, and the division of labor shall be clearly stated in the agreement during the procurement phase.

What layers of testing are required for device acceptance?
It covers at least three layers: filter element performance, installation system integrity and process protection zone performance. Specific projects are agreed upon in the agreement.

6. Related articles

ULPA ultra-high efficiency filter FAQ and selection guide

EFU equipped with ULPA ultra-high efficiency filter

Non-standard customized ULPA ultra-high efficiency 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 also provides filter elements andThe EFU equipment end fan filter unit complete machine, filter element, box installation and process protection zone acceptance content can be divided by layer within the same system. Supply boundary description can be provided during delivery. The interface locations of each layer of the filter element, box and complete machine are marked in the structure diagram.HEPA/ULPA filter delivery provides filter element factory testing data.The ULPA ultra-high efficiency filter report corresponds to a single unit according to the serial number;The non-standard ULPA filter project can be divided into factory and on-site testing according to the agreement.The FFU computer group control system records equipment location and operating settings for on-site comparison. When the whole machine is assembled, the box sealing and installation leak detection are included in the delivery scope of the whole machine. When only filter elements are purchased, the box side verification is arranged by the whole machine party. There is a clear division of labor in the procurement stage. 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.