For the clean room in operation, the value of the end high efficiency filter is not high, and the total sum may not be more than the user's two hours production value, but the risk and indirect cost of replacing the filter will be high. This article describes the useful life of HEPA filters. Zhejiang Sujing Purification Equipment Co., Ltd., located in Daoshui Town, Shangyu District, Shaoxing City, Zhejiang Province, is an excellent manufacturer in the purification equipment industry in East China. Can provide professional air purification systems for industries such as microelectronics, biomedicine, hospital operating rooms, fiber optic cables, food and beverages, precision instruments, semiconductors, and new material applications in accordance with the ISO14644-1 standard, GB50073-2001 national standard, and national GMP specifications. Engineering design, construction, testing and technical services. Bimetallic Alloy Screw & Barrel Bimetallic Alloy Screw & Barrel,Injection Molding Screw Barrel,Bimetallic Screws And Barrels,Bimetallic Single Screw & Barrel Zhejiang Jinhai Plastic Machinery Co., Ltd. , https://www.jinhaiextruder.com
When the filter is replaced, the production must be discontinued, and the loss of production can only be calculated by the owner himself. This loss is definitely higher than the spare parts cost of the filter. Replacing the filter is a very careful operation. Anything in the cleanroom cannot afford to toss and break an inconsequential device. Its loss may be higher than the cost of all filters. After replacing the filter, it must be detected by a professional, sometimes the air conditioning system is to be commissioned, and then a trial run is required after a period of time. For testing, commissioning, and commissioning, the three charges added together may be comparable to the price of the filter. Smart owners always want to extend the useful life of high-efficiency filters as much as possible, not to save the filter a few dollars. They want to avoid the hassle of changing filters.
To take an extreme example, the design life of high-efficiency filters at the end of a clean room in a modern chip factory is “a lifetimeâ€, that is, the heart of a high-efficiency filter will never be put into operation. The technology of that kind of factory is changing with each passing day. After a new project is put into production, it will be 5 to 7 years behind. The process must be updated, the factory building must be rebuilt, and the high-efficiency filter must be scrapped. There, the “lifetime†of a high-efficiency filter is seven years. For insurance, the designer has set the design life of the filter to 10 to 20 years.
If the HEPA filters have too much dust, the HEPA filter will be scrapped when it is too large to affect normal air supply. Increasing the filter area of ​​a high-efficiency filter or increasing the number of filters can extend the life of the filter. However, the game space for those practices is not large. You cannot increase the filter area indefinitely. To extend the service life of high-efficiency filters, the most fundamental method is to block the dust in the pre-filter. Replacement of pre-filters generally does not require shutdowns and no commissioning, so experienced owners will spend their attention and money on pre-filters.
For 10000 and 100,000 clean rooms, F8 filters (colorimetry 95%) can be used for pre-filtering. In this way, the end-of-life filters can typically have a lifetime of up to 5 years. In foreign projects and domestic new projects, the F8 filter is the most common prefilter for non-uniform flow cleanrooms.
For a clean plant of class 100, class 10 or higher in a chip factory, the prefilter has a common efficiency class of H10 (MPPS 85%) and many new projects simply use HEPA (≥99.97% for a 0.3mm particle). Designers claim to ensure that the end of high-efficiency filters use "a lifetime", but the way it is.
In the past domestic clean room air conditioning system design, the common configuration of the filter is: rough → medium efficiency → high efficiency. At the time, the end-of-life high-efficiency filter had a service life of only 1 to 3 years, and the worst was a few months.
In some cases, the provisions for the service life of high-efficiency filters are not based on resistance considerations but on other factors. If there is hydrofluoric acid in the plant and the workshop air conditioning is not a fresh air system, the glass fiber filter paper in the high-efficiency filter will be corroded by the return air. For safety, the high efficiency filter must be replaced regularly. Some wealthy pharmaceutical factories have to replace HEPA filters after the rainy season every year in order to prevent any possible contamination of the strains on the filters. Some biological laboratories and laboratories dealing with dangerous goods, in order to carry out a new important topic, in order to be reliable, superiors will require the use of new high-efficiency filters.
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