Particles to be filtered usually fall into one of two categories:

 

 

1.Non-deformable particles that under normal conditions (temperatures) do not deform. In some instances, non-deformable particles can become deformable with a temperature or chemistry change—an example of this would is a particle of resin, which at ambient temperatures may be solid, but at elevated temperatures turns liquid.

2. Deformable particles (frequently called gels) that deform when put under pressure. The amount of pressure needed to deform gels varies depending on the specific gel/particle. With deformable particles, if enough pressure is applied, the gel will deform, push out through the filter, and frequently re-agglomerate on the downstream side of the filter. Sometimes, when the particle re-agglomerates, it is larger than could be seen on the upstream side due to coalescence that may have occurred in the filter. In some instances, deformable particles can become non-deformable due to changes in temperature, chemistry, or other conditions.

Copyright 2008 Barney Corporation, Inc… www.Filters.com… Info@Filters.com…1.614.274.9069

 

38_year_badge

button

Read More →

 Staged filtration provides the lowest cost per liter filtered

In staged filtration, different micron ratings and types of filters are utilized to filter out progressively smaller particulate matter. Typically, this is done for cost savings with the aim of producing the lowest cost per liter filtered. An example of staging filtration is a chemical plant with a river as its water source. The first filtration step might be to use large iron bars to keep out trees (stage one). Next, a coarse wire cloth might be used to keep out fish (stage two). Stage three might be to direct the water flow through a centrifugal separator to remove sand, followed by (step four) a bag filter to remove fine sediment, etc. In this example, a case could be made that a bag filter could do the entire job. The question that needs to be asked, however, is “What makes the most sense from an economic standpoint?”
Copyright 2008 Barney Corporation, Inc… www.Filters.com… Info@Filters.com…1.614.274.9069

 

38_year_badge

button

Read More →

Staged filtration provides the lowest cost per liter filtered.

In staged filtration, different micron ratings and types of filters are utilized to filter out progressively smaller particulate matter. Typically, this is done for cost savings with the aim of producing the lowest cost per liter filtered. An example of staging filtration is a chemical plant with a river as its water source. The first filtration step might be to use large iron bars to keep out trees (stage one). Next, a coarse wire cloth might be used to keep out fish (stage two). Stage three might be to direct the water flow through a centrifugal separator to remove sand, followed by (step four) a bag filter to remove fine sediment, etc. In this example, a case could be made that a bag filter could do the entire job. The question that needs to be asked, however, is “What makes the most sense from an economic standpoint?”

Copyright 2008 Barney Corporation, Inc… www.Filters.com… Info@Filters.com…1.614.274.9069

 

38_year_badge

button

Read More →

Media migration is the phenomenon in which a portion of the filter (media) itself comes loose from the filter and travels downstream with the liquid or gas being filtered. 

An example of this is a piece of fiber from a string-wound filter being carried downstream in the liquid being filtered. Most commodity-type filters, as well as many more sophisticated membrane or membrane pre-filters, experience media migration of some kind or another. To minimize this migration of media, more sophisticated filters are frequently pre-flushed with filtered, deionized or RO (reverse osmosis) water. Typically, a pre-flushing procedure like this removes most of the loose media present in a filter.

With commodity filters, the detrimental effects of media migration can be minimized by re-circulating the material being filtered for several minutes. By doing this, any media that migrates downstream is redirected on the exterior surface of the filter, which filters the media, which has migrated.

Copyright 2008 Barney Corporation, Inc… www.Filters.com… Info@Filters.com…1.614.274.9069

 

38_year_badge

button

Read More →