Problems with precision filters
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The neutralizing solution can remove metal shavings through static filtration using a 325-mesh filter in the laboratory, but it cannot be completely filtered by a 500-mesh pipeline filter on the production line. The only difference between the production line and the laboratory is that the tank feeding the filter there is 4 meters high – is it really just due to this difference in pressure? It’s still due to a problem with the filter; please help me solve it, experts
It is related to pressure, but it also depends on the sealing of the interfaces where the filters are installed on site; generally, the equipment used in laboratories is of high quality
I really can’t figure it out. Are there any manufacturers that offer pre-made filters?
If the filter material is a woven mesh, the pore size will increase, resulting in a decrease in filtering precision
No filtering method can block everything 100%; some particles will definitely get through, and this is also related to pressure, with the difference lying in how many particles get through
Are there any good filters? Based on my estimate, filters with a particle size of 5 microns or less would be necessary
Precision filters should be at the micron level. 500 mesh is too coarse.
How much pipe is there after the filter’s location? Have they all been completely purged? The slag at pipe welds needs to be taken into consideration (compared to the way welds are treated in pharmaceutical machinery, it’s different from that used in general chemical industries; I’ve seen pipes in petrochemical plants, and they are extremely rough). The metal fragments that are filtered out can be examined under a microscope, which allows for an approximate determination of their origin. Many years ago, I was working at a pharmaceutical factory. Japanese clients requested the installation of metal detectors, but the factory’s chief engineer dismissed this idea as impossible, believing that there could be no metal shavings at all. In the end, a compromise was reached: a set of high-powered magnets (those capable of attracting stainless steel) was installed at the discharge outlet. As a result, after each batch of material was processed, metal shavings could be detected using those magnets. So the ultimate solution is to add one or several sets of high-energy magnets at the final discharge outlet.
Our quality is not determined by visual inspection; instead, filtration and filter plate testing are carried out using highly precise filter paper. The metal shavings are caused by grinding, and they are not visible to the naked eye
It is related to pressure; the sealing of the interfaces where the filters are installed on site is also very important, and all of these aspects need to be checked