Filter manufacturers provide charts showing the pressure differentials as a function of flow rate for a specific filter type and surface area.
This value is selected so that the initial differential pressure created across a new filter at this flow rate is low, typically around 0.07 – 0.15 bar (1–2 psid). In such cases, sizing will be calculated by selecting a flow rate value per unit of filter area. It is the case in most bottled water processes, where 0.22 µm or 0.45 µm membrane final filtration is selected for microorganism removal. 1) Sizing is typically based on flow rate in applications where the fluid has low amounts of particles and colloids, and therefore has low or non-plugging characteristics for the selected filter.
The sizing method depends largely on the nature of the fluid to be filtered, and how plugging it will be for the final filter selected based on the microorganism removal requirements previously discussed. For a place to start see the Quick Sizing Guide below. The two most common parameters involved in filter sizing are throughput (also referred to as capacity, expressed in volume of fluid filtered before filter change-out is required) and flow rate. Before designing a liquid filtration system, select the design basis. Due to many different types of feed solutions and filters, choosing the best filter train offers a unique challenge. Choosing the correct type for each application will lead to an optimized filtration train and reduced overall filtration costs.
#WATERGEMS UV FILTER SERIES#
Refer to the application guide for the selection of the best protective and highest capacity prefilter train.Īdequate prefiltration has been used to allow filtration of the entire batch before regeneration.ĭesigning the Ideal Liquid Filtration Trainįiltration Systems for Normal Flow Filtration (NFF) processing applications generally consist of a series of filter cartridges, with each cartridge in the series protecting and extending the life of the next filter cartridge. Then refer to the application guide for the recommended filter.Ĭlarification and Prefiltration Filter ChoiceĬlarification and prefiltration stages upstream of the final filter greatly decreases overall filtration costs by removing most of the particles that would clog the downstream final filter(s). Pore Size Selection Guide Final Filter ChoiceĬhoose the appropriate pore size of the final filter to retain the smallest microorganism to be removed. In cases of fluids containing deformable particles, the final differential pressure should be lower than the maximum differential pressure stated in the literature. The effective final differential pressure across the cartridge (change-out pressure drop) is a function of the particle/filter interaction.
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