what is stainless steel sintered filter
Stainless steel sintered filter element is a multi-layer industrial filter material made of stainless steel fiber sintered felt and woven mesh as the base material through the pleated wave process. It is mainly used for the precision filtration of high temperature, high viscosity liquids and corrosive media in the fields of petrochemical, chemical, environmental protection, etc.
Why does the service life of stainless steel sintered filter element become shorter?
The reasons for a shortened service life of stainless steel sintered filter elements can be summarized as follows:
External Factors
- Water quality issues: Unstable raw water quality or excessive impurities (such as silt, minerals, and microorganisms) can accelerate filter element clogging and corrosion.
- Frequency of use: Frequent use puts constant pressure on the filter element's microporous structure, increasing the risk of wear and clogging.
- Improper pretreatment: Added flocculants and scale inhibitors are incompatible with the raw water, forming sticky substances that adhere to the filter element surface, reducing the effective filtration area.
Internal Factors
- Material and workmanship: Low-quality filter elements have uniform pore sizes inside and outside, with only the outer layer acting as a filter element. High-quality filter elements have pore sizes that gradually decrease from the outside to the inside, resulting in a higher dirt holding capacity.
- Chemical corrosion: Strong acids and alkalines damage the passivation film on the stainless steel surface, causing rust.
Maintenance Issues
- Inadequate cleaning: Failure to regularly clean the filter element allows contaminants to accumulate, impacting filtration efficiency. High-temperature or high-pressure environments: Exceeding the material's tolerance range may cause deformation or performance degradation.
Different materials (such as stainless steel and ceramics) have varying corrosion and high-temperature resistance, which can also affect lifespan.
how to improve the life of the stainless steel sintered filter?
I. Standard Cleaning and Maintenance
1. Promptly Remove Contaminants
- If strong acids or bleach are present, immediately rinse with clean water, then soak in a neutral carbonated soda solution or ammonia solution, and finally rinse with warm water or a neutral detergent to prevent corrosion of the passivation film.
- Dust and grease stains can be gently wiped with a soft cloth dipped in soapy water or a weak detergent. Stubborn oil stains can be briefly scrubbed with an alcohol-based solvent.
2. Utilize Scientific Cleaning Methods
- Regular, step-by-step cleaning: First, use nitrogen backflush (0.3-0.5 MPa pressure) to remove large particles, followed by a 40kHz ultrasonic deep clean. This can extend the lifespan to three years.
- Avoid scratching with hard objects. Gently handle the surface with a soft brush to prevent structural damage.
II. Optimizing the Operating Environment
1. Avoid Chemical Corrosion
- Avoid contact with strong acid solutions such as hydrochloric acid to prevent damage to the stainless steel passivation layer.
- Use specialized filter media for acidic and alkaline solutions to avoid chemical damage.
2. Control Physical Conditions
- Avoid high-temperature environments (such as heat sources and direct sunlight) to prevent filter element deformation.
- Do not place heavy objects on the filter element; use a support frame to distribute the pressure.
III. Systematic Maintenance and Management
1. Strengthen Pretreatment
- Stabilize source water quality and reduce particulate matter load; optimize the compatibility of flocculants and scale inhibitors to prevent sticky materials from clogging the filter pores.
2. Dynamic Monitoring and Replacement
- Regularly inspect filter elements every 3-6 months, using pressure differential changes (initial pressure differential ≤ 0.02 MPa) to determine blockage and replace them promptly.
- High-precision filter elements require shorter inspection cycles.
3. Select Suitable Filter Elements
- Prefer high-quality filter elements with a gradient pore size structure (outer coarse filter, inner fine filter) to improve dirt holding capacity (CSC value ≥ 15 g/m²).