Stainless steel filter cartridge
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This is a filter element that has stainless steel as the core element.
It can remove physical impurities through physical means by preventing them from passing through the pores.
However, the fluid is allowed to pass through.
The filter cartridge has a housing that gives it physical protection from damage.
Besides the physical dirt, it also possible to remove chemical impurity using the filter element.
From the market, you can get filter elements with different micron ratings. Therefore, you would have a different application of the filter elements.
Due to the very low micron rating, you would be able to filter very small impurities like; yeast and bacteria sediments.
The filter element is made of stainless steel.
Stainless steel material you are likely to use include; SS 304, SS 316, & SS 316 L.
Several wire meshes are sintered together in a vacuum under mechanical pressure through cold isostatic pressing.
This increases its porosity and stability.
The wire meshes are rolled into a cylinder.
Also, the cylindrical filter can either be pleated or plain. This further increases its filtration area.
The two ends are seamed together through welding.
Besides, the shaping into cylindrical form is done to increase the roundness and flatness of the filter element.
Cylindrical shaping also increases its mechanical strength. Additionally, a courser material is added to prevent it from being destroyed.
You could test the integrity of the filter element through a bubble point test.
Through the test, you can verify that the pore sizes are uniform and of the required size, no openings are found at the joint or seems, and no media migration occurs.
It has high mechanical strength enabling it to withstand very high pressure without destruction
Besides, this filter has uniform pore sizes increasing its filtration efficiency
Moreover, it can withstand very high temperatures in comparison to some filter elements
Also, it is easy to clean increasing its service life
You can find it in different sizes.
Therefore, you may find that which suits your application.
The pore structure is firm which prevent the backflow of the impurities into the filtered fluid therefore, you are guaranteed of efficient filtration of the process fluid.
Having been made from stainless steel, it resists corrosion. Therefore, you could use it in corrosive fluids
It allows back flushing of the fluid so that you do not leave any fluid on the filter
There are several factors you might need to consider when designing the filter element. Otherwise, your filter element may not be efficient infiltration.
Some of the design considerations include;
It is dependent on pore sizes. The bigger the pore sizes the lower the filtration rate you will achieve and vice versa.
The specific pore sizes prevent the passing of particles beyond the specific pore sizes.
You could use an absolute or nominal micron rating.
The absolute micron rating is more specific with a filtration rate of 99%.
Nominal micron rating is less efficient at 60%.
Pressure drop is the difference in pressure between the inlet and outlet of the filter element. There is usually a loss of pressure between the two sides of the filter element.
You should have a specification on the maximum pressure drop of the filter element that best suits your application.
Different applications will have different temperature ranges. It may be to the extreme on both ends.
Therefore, your filter element should be applied in the right temperature applications otherwise it may fail.
The application may expose the filter element to forces that may damage it.
Therefore, the filter element of your choice should be strong enough to resist damage.
The design should allow for enough room for filtration.
Smaller filtration are would make the filter element less efficient.
Hence the reason why the filter area is either cylindrical or plain.
The main alloys of steel that are likely to make your filter element include; 304, 304L, 316, 316L, 904L
Each of the alloy has differential characteristics as discussed below;
It has increased resistant to oxidation at high temperatures.
Also, it has high resistance to corrosion
It is malleable into different shapes and sizes through welding, cutting and shaping
Besies, it is also non-magnetic in annealed conditions.
Therefore, you could utilize this alloy in many applications.
It has lesser carbon concentration in comparison to 304SS.
This makes it easier to weld easily. It also has got chromium ≥ 18% and nickel ≥8%.
It is non-magnetic with high resistance to corrosion and oxidation.
It has increased resistance to corrosion on and pitting. This is made possible due to presence of molybdenum.
Though it has similar traits as stainless steel 304, you may not opt for it in some conditions.
However, you would probably opt for it in industrial chemical manufacture of corrosive chemicals.
It is the most second utilized alloy in comparison to stainless steel 304.
This alloy has got reduced concentration level of carbon in comparison to stainless steel 316. However, you would still benefit from a similar trait as with stainless steel.
It also has higher weldability in comparison to stainless steel 316 SS.
Yes, you can use either of the procedures below;
The cleaning steps include;
You should first make sure that the differential pressure is too low to cause an accident.
Put the filter element in a nitrogen furnace and heat it to 380 degrees for 2 hours
After cooling, place the element in a strong liquid and heat it to 80 degrees for 1hr.
In case of corrosion, use a cleaning agent.
You should rinse with much water until all the residues have been removed.
Blow-dry the element to remove all the water for 20 seconds or use a an oven at 50 degrees
You should use a magnifying glass to check how clean the filter element is. The magnifying glass should be 30 times stronger.
If clean, reinstall the filter element.
The sealing configuration is the key determinant of how then sealing will be done.
Therefore, before you decide on how to seal, you need to be aware of the sealing configurations.
You cannot afford to compromise on the seal since it will have a great impact on the integrity of the seal.
Since the sealing process involves a heat process, you should leave enough allowance of the material that will be melted together to form a seal.
Therefore, you need to specify the dimensions of the Stainless Steel Sintered Filter Cartridge having put the seal into consideration.
That is during the making of the filter element.
Otherwise, you risk having a leaking filter element.
The filtration area is the surface area around the filter element where filtration takes place.
Remember, the bigger the filtration area the more the surface area for the filtration of the process fluid.
Also, the more the filtration area the higher the filtration efficiency.
A small filtration area would reduce the efficiency of your filter element.
Among the design chosen for the filter cartridge, a pleated design is the most ideal.
It creates more filtration area giving you an increased efficiency infiltration.
The diameter of the filter element also has an impact on the efficiency of the filter element.
A bigger diameter provides a bigger surface area for filtration and increased efficiency of the filter element.
Therefore, if you have an opportunity to specify the type of filter element you want from your manufacturer, you should be sure to have a high surface area.
The flow rate of the process fluid at a given pressure is also increased by having a high filtration area.
Therefore, if you want a more reliable filter element it should be of high filtration area
In the manufacturing arena, there are different types of filter elements.
You should therefore be able to choose a filter element that best suits your application.
Some of the filter elements that you can choose from include;
Let’s explore these filters:
This filter element is composed of a mesh wire filter.
Also, the mesh wire filter should be of high quality.
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Besides, the wire mesh is formed through high temperature and pressure.
The formed wire mesh is then taken into drawing to provision.
Some of the features characterized by the filter element include;
You will find it is highly utilized by the oil industries, chemical fiber, and electroplating industries.
The oil industry will mostly use it in removing mud, the chemical fiber industry will use it as a strainer whereas the electroplating industry will use it in acid pickling.
The filter element is made of different materials other than stainless steel which include; brass wire and nickel.
Its wire has got two diameters which can either be weft or warp.
This type of filter is weaved using different styles.
Some of the weaving you may find include; twill weave, double wire dutch weave, dutch weave, and plain weave.
Pleated filter cartridge has got stainless steel fiber as the main material.
However, you may also find wire mesh being used.
Stainless steel 304 and 316 are the main materials used.
Some of the benefits you may derive from using this filter element include;
The filter wires are wedge-shaped making them ideal for your use in challenging applications.
Its continuous aperture provides a large surface area guaranteeing you of low-pressure drop or tendencies to clog.
The precise slot makes wedge filter ideal for you to use in starch extraction
Besides, the increased number of its welds and winding wires makes it strong and long-lasting. Therefore, it doesn’t only save you on maintenance cost and replacement but also it is useful in waste management.
These filter element has increased capacity for effective fluid/ solid separation. You could also utilize it in the straining of fluids.
Other applications include; pulp and pare, plastic extraction, adhesive filtration, petrochemical, and chemical extraction.
Other benefits include;
Both filter elements are made through a sintering process with single or multiple layers.
The main difference is on both is on the design one as a disc and the other as a cartridge.
However, you will experience similar benefits on mechanical strength, low-pressure drop, inherent stainless steel qualities, and resistance to high pressure and temperature.
Whether to go for stainless steel filter disc or filter cartridge will depend on your application requirements.
Sintered stainless steel filter disc
Sintered stainless steel filter cartridge
A sintered filter is a type of filter that is made from powder materials, using pressure and heat to make them bond together while keeping a porous structure.
If you want to learn more about sinter filters, this blog has these parts you may like to read:
The sign is used to represent different degrees.
The filtration rating is also called filtration accuracy, which refers to the ability to remove specific particles from the fluid. It can be measured by the size of particles that the sintered porous filter trapped.
The filtration rating can be expressed in terms of microns (µm), which represents the particle sizes. Typically, the general filtration rating of sintered metal filters ranges from 0.5 to 100 microns (µm).
Among those sintered filters mentioned above, those used in special environments could offer filtration ratings of a higher level. For instance, the filtration rating of sintered plastic filters can reach 0.2 micron when used in pharmaceutical, biotech, or microelectronics.
Each sintered material has a specific working temperature range.
Some could be hard to stand at high temperatures like sintered plastic filters could work at 150°C approximately at most, or thermal degradation may occur.
Some have better heat resistance as sintered ceramic elements’ working temperature can be up to °C.
If the operating temperature is too high that filters can’t withstand, the pores gap will change, affecting the filtration efficiency. On the contrary, when the operating temperature goes too low, the whole structure may be brittle, and easy to be damaged.
You may want to know the recommended temperatures of each sintered material:
You need to consider the operating temperature range and the specific requirements of your application. Only in this way can you ensure consistent performance.
Sintered metal filters are primarily produced using powder metallurgy, through powder mixing, powder compaction, sintering, and secondary operations.
Depending on your application, you can choose common types of powder materials such as metal powders or polymer powders.
In addition, you can also mix the powders to achieve specific properties.
With intense pressure, powder materials are compacted in molds that have variable shapes (sintered disc, sintered plate, sintered tube, etc.). However, the whole porous structure remains relatively loose.
The key step of manufacturing is the sintering process in powder metallurgy, which determines the properties of sintered parts.
Filter materials will be heated to a temperature lower than its melting point, bonding the powders together, while keeping physical properties.
After the filter elements cool down to room temperature, check the quality according to your requirements.
If there are some deviations, then reprocess (cutting, polishing, or machining). Finally, clean the sinter filters to remove contaminants.
Why choose sinter filters? Here are some advantages that ensure their reliable filtration performance.
Most of the sintered metals have a natural resistance to corrosive chemicals so they can still maintain a good state under chemical reactions.
Sintered glass and sintered ceramic also have excellent performance in corrosion environments.
You can choose sintered filters of specific filtration accuracy to keep the filtration efficiency at a high level.
In HVAC (Heating, Ventilation, and Air Conditioning) systems, sintered metal filters with filtration ratings ranging from 5 to 20 microns are commonly chosen to protect HVAC equipment from contaminants. These filters can effectively capture various particles in the air.
What’s more, the material that does not react chemically with the fluid can avoid the entry of new substances. In all, the filtered results will be more accurate.
If there are pressure fluctuations during the filtration, the entire system will be affected to some degree.
Due to their mechanical strength, sintered metal filters are good at maintaining fluid pressure to ensure stable system operation.
Sintered filters have better durability and longer service life in extreme temperatures. With proper maintenance, these sintered parts can be used for many years, often ranging from 3 to 10 years or even longer in some cases, which can reduce the number of replacements, thereby saving costs.
Though many advantages are provided, they still have some potential drawbacks that you need to notice:
The choice of materials mainly determined the cost of sinter filters. High-performance materials can be more expensive.
Also, the complexion of the manufacturing process adds to the cost.
In March , the price of stainless steel mixed powder (SS-303L) with a diameter of 100 microns in China is about $590,000 /ton.
As time goes by, small pores may become clogged with particles, reducing the filtration efficiency. In other words, they need regular cleaning and maintenance.
Cleaning may require specialized equipment and procedures. Some sintered elements used in chemical environments can be more challenging to clean thoroughly. This means it costs not only money but also extra time.
Raw materials for making sintered filter elements are not of a wide range.
What’s more, one material cannot be applied to all situations. So for special environments, the choice will always be limited.
Compared to other filters, the manufacturing time of sintered filters is long. For different sintered materials, the production time of some sintered metals may be longer.
For example, if the production time of a batch of sintered bronze filters is 1 day, the same number of sintered stainless steel filters could take a week or more.
So if buyers need a great amount of sintered filters, it’s better to place the order in advance.
Sintered porous filters are widely used in fluid filtration or liquid filtration, allowing fluid (liquid) to pass through the pores.
When flowing through the filter, particles larger than the pore sizes are trapped, thus the fluid is purified.
When the sound waves go into the filter, they will cause the air in the filter to vibrate. This movement creates friction and resistance, which turns the energy of sound into heat, reducing the amplitude of the sound waves.
Due to plenty of distinct advantages, sintered filters have a wide range of applications.
For beverage production, you can use filter layers to filter pulp and suspended solids to ensure the clarity of the liquid.
Meanwhile, purified water for food processing can also be obtained by water treatment.
In chemical processing industries, these sintered filters can be used in corrosive environments, like sintered glass filters used in laboratories.
Some chemical waste may be harmful to the environment, which requires some filtration of these substances.
You can also use sintered filter elements to remove impurities in the operating conditions. It can maintain the normal operation of the machine and extend the service life.
(For instance, sintered bronze filter discs are used in vents of electric motors to prevent the entry of dust, moisture, and other contaminants while allowing air exchange. This helps to maintain the internal environment of the motor.)
Porous metal filters are used to remove contaminants from fuels and lubricants, ensuring smooth operation and prolonging the life of machinery.
(Sintered stainless steel filter tubes are used to remove contaminants from crude oil during production and transportation processes. These metal filters help to keep product quality, protect equipment, and prevent pipeline fouling.)
Visual inspection is to check for signs of damage and decide whether it needs replacement.
Then perform a short filtering action, and test the filtered fluid to see whether the filter layer is clogged.
After a period of use, there may be some residual dirt on the filter layers, which will cause blockage if not cleaned in time.
After a basic introduction, you may still have some of these questions:
The uniform pore size is the key point to the precision, which affects the final filtration efficiency. What’s more, the sintered powder sizes could make a difference.
As said above, the numbers and sizes of pores distributed on the filters directly determine the filtration efficiency. It is the temperature and time of sintering that control these factors, that’s why sintering does matter.
As delineated by Wikipedia, this method is integral to the fabrication processes employed across various substances, including metals, ceramics, plastics, and more.
Yes, of course they can.
Filtration in the pharmaceutical industry usually involves liquid filtration and gas filtration, which stays in line with the scope of the application of sintered metal filters.
(For example, you can use sintered metal filters in the final filtration, removing residual particles or microorganisms before packaging.)
Generally, paper coffee filters have average pore sizes ranging from 10 to 20 microns, which vary depending on the material type and brand of the coffee filter.
If you are referring to the espresso puck screens, especially those made from sintered stainless steel, the filtration rating is around 150 microns.
Yes.
According to your application and requirements, you can customize specific characteristics (pore sizes, powder sizes, sintered materials, shapes, and flow rate) of your porous metal filters.
In addition, the operating environment needs to be considered as well.
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