For those who need tailor made filter cloths, there numerous parameters which have to be taken into account. When designing a filter press, the fabric design will depend on several factors such as the flow rate require or the pressure that can be tolerat by the filter cloth. To figure out which filter cloth works best in your case, it’s important to understand. What types of fabrics work best under which conditions and why. This article will describe some of the most important parameters to take into account. When deciding what type of filter cloth to use in your case.
Flow Rate
- Characteristics of the contaminant. Size, shape, chemical properties, and reactivity to heat or pressure could all affect your selection. 2. Particle size distribution (PSD) of the contaminant. The PSD indicates how much of the contaminant is in different size ranges. Which will dictate whether to use coarse, medium or fine mesh pores to trap different sizes 3. Pore size you want/need in your filter cloth
- Durability and tensile strength of the filter material 5. Field conditions
Filter Pore Size
The last consideration for which parameter to use for your Automatic filter press is the pore size. The larger the pore size, the more solid material will filter out and the smaller it becomes, the finer particles are removed. The most common range of pore sizes is between 100-5000 microns. Common applications include water treatment and chemical processing.
Filtration Efficiency
A filter cloth provides high levels of filtration efficiency, as it is porous and can capture small particles. Filter media is commonly made from sine metals, such as steel wool. To maximize the effectiveness of the product, various factors need to taken into consideration. For example, the filter media needs to have an appropriate size range for. The desired application to function at optimal levels. Likewise, there needs to be enough material so that. If one piece of material becomes plugged with dust or other particles, other pieces are available for particle capture.
Outlet Pressure Drop (Pressure Drop Across The Filter Media)
Pressure drop across the media will vary depending on the flow rate, density and geometry of the filter fabric. Low-pressure drop filters have a low resistance to flow but require larger areas of media. High-pressure drop filters are more resistant to flow but may require smaller areas of media. Choose an appropriate combination that suits your needs. Select a filter with high outlet pressure drop if you have high flows and/or heavy solids in your water supply.
– Select a filter with a low outlet pressure drop. If you have lower flows or only light solids in your water supply. Consider also the differential pressure across the filter. It is useful to select a differential pressure rating higher than your anticipated maximum differential. If this is not possible, it is recommended that the seal of the nozzle (the point where no water passes) has at least one-millimetre space between it and its sealing surface, otherwise, over time there can leakage from under compression seals due to expansion from increase differential pressures. Another important parameter for filtering out particles are air gap thickness; particles larger. Than 2 microns typically need about 15-20mm for adequate removal, whereas particles below 1 micron do not need an air gap thickness as great.
Operating Temperature
Filters need to remove contaminants from fluids and gases that pass through them. This is why it is critical for the engineer to take into account. The operating temperature of their fluid or gas and choose a material based on its limitations regarding these conditions. Materials like metals, which have an inherent ability to conduct heat as well as dissipate it, will not work very well at lower temperatures but will work perfectly at higher temperatures; whereas materials like glass fibres, while they have good insulating properties, would not work well at all in colder conditions. For example, copper cannot handle less than 30°C but plastic can withstand -5°C easily.
Chemical Resistance
Depending on the type of chemicals used, filters must either resist or break down the chemical. Choose a chemically resistant filter. For example, if the chemical being filter is oil, use activated carbon or ceramic powder to soak up the chemicals from the fluid. Activated carbon filters work well because they can handle more than just oils and organic compounds like crude oils. They are also effective at filtering out heavy metals and some radioactive substances.
Packaging & Transportation Requirements
-The type of liquid being tailor made filter press. For example, liquids with high or low viscosity and materials suspended in the liquid.
-The temperature of the product being filtere. For example, gases, liquids and solids.
-Chemical resistance requirements for the filter material against particular components found in. The filtrate stream; for example calcium salts, sulfuric acid etc.
-Safety factors related to flow velocity stresses from contraction of solid pieces near downstream openings; for example, hose. Clamps, filters at a point where taper diameter changes sharply etc.
-Ability to withstand increased pressure drop during use due to fine particles created by filtration process depositing on mesh during the filtration process
