According to the accuracy of the filtering
The resolution of filtration accuracy may be the most troubling problem, because the range of accuracy is very wide, and if we want to eliminate visible pollution impurities, we need to choose 25 micron equipment; if we want to eliminate the liquid cloud, choose 1-5 micron equipment; then to eliminate smaller bacteria, choose 0.2 micron equipment, so the application environment is different, the filter accuracy is different.
Now the unit of filtering accuracy is divided into two kinds: affirmation accuracy and nominal accuracy. Affirmed accuracy refers to the ability to remove 100% of the indicated precision particles, which is impossible for any kind of filtration equipment, is not a practical specification. While others belong to the nominal accuracy, which is the most important specification for selecting equipment, and is also the place we bother, because the nominal accuracy is not jointly identified by a professional community and fulfill the specification.
According to the filtration temperature and viscosity
Professional filter equipment provider can accurately calculate the professional demand what kind of filtering equipment, such as device how many filter, each filter bearing much velocity, early pressure drop, etc., if you can provide the performance of the filter medium, such as impurity content, temperature, working condition, liquid composition, etc., so about selection is also very useful.
Design of the filtration system
The design includes more different aspects, such as what kind of pressure source we should choose, how much pressure is needed, whether we need two sets of filter equipment in parallel, how to deploy coarse filter and fine filter, whether we need the device check valve or other device, these problems have to be fully considered in the early stage of the design.
The selection of the filter data
When selecting the data, we should first select the corresponding available filter material according to the properties of the filter medium, and then evaluate the operating pressure, temperature, acid and base value one by one, so as to remove the unapplicable filter material. For example, the filter element is folding filter element, wire winding filter element, melt-blown filter element, filter element of PES polyether sulfone raw material for pharmaceutical and food and beverage; and chemical liquid with strong acid and alkali, PTFE PTFE as raw material.
It is necessary to pay attention to the different uses of products is one of the important factors. For example, the materials used in drugs, food, cosmetics and other production must be allowed by FDA, while the production of ultra-pure water requires pure filter material without release; the principle of hydrophobicity, etc.
