Having a definition of a “clean” part and a means to quickly and effectively determine if the the criteria for cleanliness has been met is very critical to the success of any cleaning process. The problem, however, is that there are so many ways to define and detect cleanliness that the task can be a …
In this series on filtration I have not mentioned much about filter ratings other than to say that most filters are rated based on the minimum size of particles they will capture. It is important to know that a filter rated at 5 microns, for example, may not prevent the passage of all particles with a …
The most challenging applications for filtration often involve either very small particles or huge volumes of particles – sometimes both. The filtration of buffing and lapping compound residues from solution is a good example of such an application. There are a number of “specialty” filters available which may answer the needs of the more challenging applications. …
For any filter to be effective, the liquid being filtered must circulate or re-circulate through the filter in an efficient way. In a spray system, the cleaning or rinsing liquid usually returns from the filter directly to the spray head(s). This means that the liquid spray used to clean or rinse is as good as …
At first glance, plumbing a filter into a system doesn’t sound like a big deal. In fact, it really isn’t, but there are right ways and wrong ways to do it. Here are a few ideas. First, liquids should always be PUSHED, not PULLED through a filter. Most pumps used in industrial and precision cleaning …
Filters do not last forever. In the course of doing its job, a filter becomes progressively more resistant to the flow of liquid. As this happens, flow is reduced and, as we’ve mentioned before, this process may even be accelerated by the fact that the partially blocked filter retains smaller and smaller particles. The price of …
If a filter is doing its job, its life will be limited. Eventually it will have filtered out and collected enough particles to be severely restricted or totally block liquid flow. When this happens, the filter or filtration media must be replaced. A clogged filter will, at minimum, have process consequences as particle accumulations build up …
The useful life of most media filters is determined by the size and quantity of particles they capture. Each filter has only a limited number of sites to trap particles. Once a site traps a particle, flow through that site’s passage is either reduced or stops completely. When a sufficient number of sites are blocked, flow through …
One important step on the path to solving any problem is understanding the enemy and the risk it poses. The enemy, in this case particles, come in a wide variety of sizes and shapes. A particle’s effect on the ultimate use of the part it contaminates may depend not only on its size, but on …
Many topics can’t be covered in a single, one page blog entry. For this reason, some of the more involved topics will be discussed in several sequential blogs with a common theme. This is the start of one such series about filters and filtration. In parts cleaning, filtration is applied to liquids used to clean …
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