1. Unreasonable engineering design.
Generally speaking, the phenomenon of unreasonable engineering design rarely occurs. These problems often occur in some small projects with low purification requirements. Now there are many purification manufacturers, and the competition is becoming more and more fierce. Some construction enterprises offer very low prices in order to win the bid. In the later construction, they use the situation that the other customers don't understand to cut corners on work and materials. Of course, this is only one aspect. On the other hand, after the design and construction began, the customers added new requirements and purification areas, The original design can not meet the requirements. These congenital defects are difficult to correct and should be avoided in the engineering design stage.
2. Replace high-end products with low-cost products
In the application of high-efficiency filters in clean rooms, the state stipulates that primary, medium and high-efficiency filters should be used for air purification above 100000 levels. As the continuous large-scale purification projects use sub high efficiency air filter to replace the high efficiency air filter of 10000 level purification, the cleanliness is poor. Finally, the high efficiency filter was replaced to meet the requirements of GMP certification.
3、 The air supply pipe or filter is not tightly sealed.
This phenomenon is caused by rough construction, indicating that some rooms or parts of the same system do not meet the conditions at the time of approval. An improved method is to use the light leakage test method to detect the leakage of the air supply pipe and use the filter. Scan the particle counter test section, sealing adhesive and mounting frame to locate the leak and seal carefully.
4、 Improper design and commissioning of return air duct or air outlet.
When designing, some customers don't have enough space, so there is a shortage in the number of return air or return air outlets on the upper air supply side, which makes the workshop unable to use. Therefore, when designing the GMP clean workshop, we must pay attention to this regardless of the size of the space. Of course, after excluding the design reasons, The commissioning of air return outlet is also a very important link. If there is a problem in commissioning and the resistance of the return air outlet is too large or too small, the return air volume will be less than or greater than the air supply volume, then the cleanliness will certainly not meet the standard.
Today, Xiaobian presents you the relevant knowledge about air purification engineering. If you have any questions and questions about this article, please call us or leave a message below the website: http://www.jnyhrs.com