Important factors to consider selecting a proper filter bag for water treatment
Nylon filter bags, polypropylene liquid filter bags, polyester filter bags, and stainless steel mesh filter bags, among others, are the most popular liquid filter bags available on the market. In addition to selecting the right material based on the fluid's characteristics, choosing a liquid filter bag also requires taking into account issues, like filtration accuracy and the needs of the filtration system.
Let’s look at the four important factors to consider before selecting the proper filter bag for water treatment.
1. Filter Bag Composition
The most appropriate filter material should be evaluated one at a time, based on its operating temperature, pressure, and operating conditions after first determining the proper filter material, based on the fluid's chemical name and the chemical coordination.
Additionally, the requirements for choosing liquid filter bags vary depending on the industry. For instance, materials used in the pharmaceutical and food industries must be govt.-approved, and materials used to filter ultra-clean water must be pure and free of emissions, which will change the impedance.
2. Filter Bag Accuracy
The capacity to filter out all of the particles identified with accuracy is referred to as filtering accuracy. Relative accuracy denotes the ability to filter out 60–80% of the particles, with the specified accuracy.
Absolute filtration accuracy is defined as the impurity removal efficiency of more than 98%. In this regard, knowledgeable professional filtration product suppliers will aid clients, in creating appropriate liquid filter bags, although, the simplest solution still requires testing, so that the liquid filter bags that were purchased may really catch undesired contaminants.
3. Design of Filtration Systems
In order to choose liquid filter bags, it is also required to take into account the flow needs and pressure requirements of the complete filtration system. For instance, which pressure source should be chosen, how much pressure is necessary to fully utilize the life of the filter bag, whether two sets of filter housing should be installed in parallel to suit a continuous operation system, how to match the coarse filter with a wide particle size distribution, whether check valves or other devices should be installed in the system, etc.
4. Viscosity and temperature of the filtration fluid
The expert supplier of filtration equipment can determine the needed size of the filter housing, the flow rate of the filter bag, and forecast the first pressure drop based on the viscosity at the filtration temperature. The service life of the filter bag might potentially be approximated, if you could provide the impurity content of the fluid.
Types of filter bags
There are many types of filter bags that are manufactured in strict accordance with regulations. The primary filter bag that is offered includes:
1) PE filter bag: This type of filter bag is the most popular type, and it has a strong chemical resistance and a working temperature range of less than 170-190°C.
2) PP filter bag: It is utilized for liquid filtration in the chemical industry, exhibits good acid and alkali resistance, and operates best at temperatures under 100°C.
3) Nylon filter bag: These are effective chemical resisters (except acid resistance) less than 170-190°C when working.
4) Stainless Steel Filter Bag: The stainless steel filter bag is woven into a mesh in accordance with precise standards.
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