Stainless steel filter cartridge is the filter element made of stainless steel filter media and hardware, and which is in the shape of tube or cylinder working as cartridge.
Stainless steel material for filter, mostly used
What is the application scenario of stainless steel filter cartridges
Stainless steel filter cartridges are more suitable to high temperature and high pressure working conditions than most of the non-metallic filter cartridges.
And they are applicable for various cleaning methods which are often not acceptable for non-metallic filter, such as high pressure water washing, chemical bath, ultrasonic cleaning, heating and even incineration.
Therefore the stainless steel filter cartridges are the best choice for automatic filter with backwashing or backflushing.
Auto backflushing diagram showing the flow direction, from Hydac
What is the stainless steel filter cartridge designed to replace
The wire mesh and sintered mesh have the surface filtration property. The solids/ impurities are stopped by the mesh and stay/ accumulated on the mesh surface. The solid can be easily removed or collected during the cleaning process.
Sintered metal fiber felt has 3D porous structure as the metal fiber laid layer by layer and diffusion bonded. The porous structure can capture the solids and have high dirty holding capacity. The filtration is in-depth filtration similar as non-woven media.
Filter media for stainless steel pleated and cylindrical filter cartridge
What is the advantage of stainless steel filter cartridge
Comparing to the non-metallic filter elements, the stainless steel filter cartridges have the advantages of:
Working for high temperature
Withstanding high pressure
Washable and reusable
Suitable for automatic backwashing / backflushing
Good heat transfer
The shortage / Cons of stainless steel filter cartridge
Weight. Stainless steel has times of weight than non-metallic materials.
Cost. Stainless steel filter is more expensive than most of the non-metallic counterparts.
Corrosion resistance. Although 316L and higher grade stainless steel have good corrosion resistance, they can not compete with some non-metallic material like PTFE in certain severe corrosion conditions such as HCL hydrochloride acid
Limited filter rating. The micron rating of stainless steel filter is limited to 0.5 micron minimum by now and not possible extended to 0.01 micron or smaller in near future. Therefore, stainless steel filter now is mainly used in filtration of micron and millimeter range.