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Estimating the Total Cost of Cartridge and Bag Filtration

By Frank Buehner, Filtration Technology Corp. |

Bag filters for industrial applications have been in existence longer and are considered by some to be easier and simpler to specify than cartridges for a filtration project. And although cartridge filtration is now one of the mostly widely used filtration technologies in the chemical process industries (CPI), it is not always the first choice. How does one decide which filtration method should be used? Like any other technology choice, this decision is based upon the strengths and weaknesses of the two options. There are many factors an engineer should consider when choosing a filtration system. So when does one specify a cartridge filter instead of a bag filter? What are the basic differences between the two? How does one determine filter life for either type? Often the lack of a logical approach to liquid filtration design leads engineers down a what did we do the last time approach instead of determining critical properties, such as the total dirt-holding capacity, filter life, filter surface area, flowrates, and other factors. Schooling in this unit operation is not a common university practice, and the lack of ASTM standards, for instance, regarding filtration test procedures and specification of filters adds to system under-…
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