Guidelines for Industrial Filtration

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Industrial filtration is the domain of facilities that require capture of dust particles in a production process. For example, manufacturers of over-the-counter (OTC) pharmaceuticals who use encapsulation formulations require bag filters to trap the normal volume of dust produced in capsule and tablet form.

The type of bag filters used in this process is usually composed of special weight fabric with coated membranes. The “cloth-to-particulate” ratio is extremely important to ensure that dust particulate captured doesn’t pass through the cloth fabric. Facility managers study this ratio and determine how fine the particulate is first and then choose bags that will trap as much of the dust as possible.

Bag Filters
In industrial facilities where baghouses are installed, the bag filter size varies according to the throughput of the production rate. For example, the OTC pharmaceutical facility may have a throughput rate of two tons of product per hour. Bag filters must be able to comprehensively trap dust particulate so that bags do not overfill with dust before the end of a production cycle.

A baghouse for an OTC pharmaceutical facility might be the size of a large garage. The ceiling of the baghouse is installed with a grid system and metal “cages” into which these industrial filters are inserted. Bags are secured to the top rim of the cages and the cages are suspended from the grid in the ceiling.

Industrial Filters for Liquid Products
In the case of liquid products, industrial filters provide assurance that product will remain at a 99% purity rate. For example, in the production process for flavors and fragrances, the filtration equipment is “packed” with a porous media into a cylindrical hopper. When liquid passes through the “packing,” it captures particulate that would normally contaminate or destroy product quality.

In some cases, industrial filters are cartridges that are cylindrically shaped or somewhat flat. These remove much of the microscopic particles that reduce product quality and efficiency. The type of industrial filtration depends on the type of materials used in processing, the throughput and also the filtration efficiency rating to be achieved.

Industrial Filtration for Gaseous Products
With gaseous products, an industrial scrubber is the most commonly used equipment to remove particulate and contaminants. This scrubber utilizes gas-to-particulate separators and coalescers. Gas scrubbers are, of themselves, considered a type of filtration due to their operational features. A gas scrubber may also remove fumes as well as particulate. These are sometimes referred to as Venturi Scrubbers. The design of this type filtration has an inlet and outlet and also atomizes gases and/or fumes through the inlet into the throat of the central cylinder where sprays form small droplets that pass through to the outlet.

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