Monthly Archives: September 2018

Compressed Air Dryers: Refrigerated vs. Desiccant

desiccant air dryerTwo common types of compressed air dryers are refrigerated and desiccant. It is important to learn from a reputable compressor air filter supplier in Richmond how each drying technology works to learn which is best for your application.

Refrigerated dryers
Refrigerated dryers work by cooling the air to low temperatures and condensing much of the water vapor. It is not possible to achieve dew points below freezing with a refrigerated dryer. Refrigerated dryers that are optimally designed can produce air with dew points to approximately 36°F (2°C). Since some water vapor is left in the air, these dryers should not be used in applications that are water sensitive.

Desiccant dryers
On the other hand, desiccant dryers operate by passing the compressed air over a bed of desiccant material which absorbs water vapor molecules. When the bed capacity is nearly saturated, the air flow switches to a second bed of desiccant material. The first bed is then regenerated. Desiccant air dryers can deliver air at consistently low dew points. This technology is an excellent choice when the compressed air is subject to freezing conditions. While heated desiccant dryers use heat to remove water vapor from the desiccant material not in use at that point in the cycle, heatless dryers use the dry air to remove water vapor from the desiccant material.

Three Popular Types of Liquid Filter Bags

variety of standard liquid bag filtersGreenleaf Filtration offers a wide array of liquid bag filters for the unique needs of your facility. With a wide range of micron sizes, our inventory of bag filters can support many industries, such as chemical, food, and paper. Keep reading for some information on three popular types of liquid filter bags from our industrial filter supplier in Richmond.

Felt bag materials meet FDA regulations and can carry a high capacity of dirt. They are typically offered with micron ratings from 1 to 200. With felt bags comes the ability to remove both solid and gelatinous particles at a low cost. A singed or glazed finish over polyester and polypropylene reduced fiber shedding of these liquid bag filters. Steel-ring bags have a galvanized steel ring sewn into the top of the bag, while plastic flange bags have a specially-designed flange. Handles are standard on both types of felt liquid filter bags.

Mesh filtration bags also meet FDA regulations and are offered with a micron rating of up to 1500. These bags allow for economical removal of nondeformable contaminants and are compatible with a wide array of chemicals. Like felt bags, mesh bags have handles and are available with a steel ring or a flange.

Polyester Phenolic Treatment (PEPT)
The design of a PEPT liquid filter bag incorporates single or dual layers of Phenolic Resin Textile. Unlike cartridges, PEPT’s filter bags contain the contaminants securely inside the bag. They are available in micron ratings from 1 to 200 and offer an excellent removal of gel-like particles. Handles are standard on all PEPT bags, along with the choice of steel ring or plastic flange.