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Filters for Compressed Air - Application and Testing

Views: 0     Author: Site Editor     Publish Time: 2023-08-18      Origin: Site

A compressed air filter is a device used to filter impurities and contaminants from compressed air. It is widely used in a variety of industrial fields, including manufacturing, construction, automotive maintenance, etc., and serves to protect equipment and processes.

1.      Application of compressed air filter

The role of compressed air filter is mainly in the following aspects:

1) Filtering impurities

there are a variety of solid particles, moisture and oil and other impurities in compressed air, these impurities will have a negative impact on the equipment and process. Filter can effectively filter out these impurities, to ensure that the supply of clean compressed air required for the process.

2) Separation of moisture

In compressed air, there is often moisture. Moisture can cause equipment corrosion, water logging and other problems, affecting the normal operation of the equipment. Through the separation function of the compressed air filter, the moisture in the air can be effectively separated to ensure that the equipment is affected by moisture to a minimum.

3) Oil removal

In some specific processes, oil in compressed air can seriously affect the quality of the process. Through the oil removal function of the filter, the oil in the compressed air can be removed to ensure the normal process.

2.      Important indicators of compressed air filters

Important indicators of compressed air filters mainly include:

1) Filtration precision

Refers to the filtering effect of the filter for impurities of different particle sizes. Generally speaking, the higher the filtration precision, the better the filtration effect.

2) Pressure drop

Refers to the pressure drop generated when compressed air passes through the filter. The smaller the pressure loss, the lower the energy consumption required by the equipment. 3.

3) Service life

Refers to the time the filter can be used continuously. A filter with a long service life can reduce the frequency and cost of replacement. 4.

4) Applicable environment

Different industrial environments have different requirements for filters, such as high temperature and high humidity. A filter with a good application environment can operate stably in complex environments.

In compressed air filter testing, the above indicators are usually tested and evaluated. Test methods include measuring filtration accuracy with particle counters, measuring pressure drop with differential pressure gauges, and conducting applicable environment tests by simulating actual environments.

3.      Testing standards of compressed air filters

Standards relating to compressed air filters include ISO 12500, ISO 8573, EN 1822, ASTM D6786 and others. Among them, the test methods are ISO 12500 Filters for compressed air - Test methods, ISO 12500-1 Part 1: Oil aerosols, ISO 12500-2 Part 2: Oil vapours, ISO 12500-3 Part 3: Particulates, ISO 12500-4 Part 4: Water. ISO 12500-1 Part 1: Oil aerosols, ISO 12500-2 Part 2: Oil vapours, ISO 12500-3 Part 3: Particulates, ISO 12500-4 Part 4: Water.

4.      Testing of compressed air filters

Through testing, we can verify that the filters are effective in removing airborne contaminants, ensuring the proper operation of equipment and the health and safety of employees.

1)      Airflow test

This test focuses on evaluating the air handling capacity of the filter. The tester needs to use a professional airflow meter to measure the airflow velocity and pressure loss of the filter. By comparing the airflow velocity at the inlet and outlet ends, we can assess the resistance and efficiency of the filter. If the resistance of the filter is high, it may be necessary to consider replacing the filter or adjusting the operating parameters.

2)      Particle filtration efficiency test

By bringing a certain concentration of particulate matter through a filter, testers can measure the efficiency of the filter in capturing the particulate matter. Typically, the test will be conducted using particulate matter with different particle sizes to evaluate how well the filter filters a variety of particulate matter. The results of the test will show the capture efficiency of the filter, which is essential for selecting the appropriate filter.

Fine filter test condition

The aerosol challenge for test shall be produced by the use of an aerosol generator that is capable of generating either solid particles of sodium chloride (NaCl), potassium chloride (KCl) or liquid aerosol of diethylhexylsebacat (DEHS) in accordance with EN 1822-1. In order for the results to be statistically valid, the generation rates of the challenge aerosol shall be in accordance with EN 1822-2. Tests performed to determine the location of the MPPS shall be performed using a monodisperse aerosol distribution.

Coarse filter test condition

The test dust for determining the particle-removal efficiency shall be in accordance with ISO 12103-1, A4 coarse dust.

3)      Oil filtration efficiency test

Oil mist is a common air pollutant, especially in industrial production processes where large amounts of oil mist pollution are generated. Therefore, it is important to evaluate the effectiveness of filters in removing oil mist. Testers can use a specialised oil mist concentration tester to measure the oil mist removal efficiency of a filter.This test will provide an indication of how well the filter is handling oil mist contaminants. Oil removal efficiency includes Oil aerosol and Oil vapours, where Oil aerosol test oil is Mineral oil lubricants, VG 46. concentration 10~40mg/m3, polydispersed oil aerosol, average particle size in 0.15μm~0.4μm, photometer as detector. Test inlet oil concentration, outlet oil concentration. Oil vapours were tested with hexane, and the test indexes were adsorptive capacity (average mass of test agent), adsorbed capacity (average mass of test agent), and adsorption capacity (average mass of test agent). The test specification was adsorptive capacity (average mass of test agent adsorbed), flame-ionisation detector or infra-red analyser was used as the detector.

4)      Lifespan assessment

This test is designed to evaluate filter life and maintenance intervals.The tester can assess the life of the filter by monitoring the change in pressure loss and cleaning/replacement intervals of the filter. This will help to develop a sound maintenance programme to ensure the long-term effectiveness of the filter.

5.      Conclusion

Filters for compressed air are used in a wide range of applications and testing is an important step in ensuring filter performance and effectiveness. Through airflow measurements, particulate capture efficiency tests, oil mist removal efficiency measurements and life assessment, we can fully evaluate the quality and capability of a filter. Through the correct selection and use of compressed air filters, the quality of the process can be improved, the life of the equipment can be extended, maintenance costs can be reduced and more efficient production can be achieved.

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