Industrial compressor air cleanliness about how much

Official statement on air cleanliness of industrial compressors

in the industrial compressed air system, air cleanliness is the core index to measure the performance of the system, and its numerical characterization is directly related to the stability of the production process and the reliability of product quality. After systematically combing the industry norms and technical characteristics, the relevant standards are now as follows:

quantification system of 1. cleanliness
industrial compressed air cleanliness using three-dimensional evaluation system:

1. particulate matter concentration: based on the number of particles in the 0.1-5 micron particle size segment, the clean room level application requires ≤ 1000 particles/m3.
2. Oil content: The total oil content is determined by infrared spectroscopy, and the precision manufacturing field needs to be controlled below 0.01 mg/m3.
3. Water content: the pressure dew point temperature characterization, electronic packaging process requirements dew point ≤-40 ℃, equivalent to the absolute water content ≤ 0.05g/cubic meter.

2. typical application cleanliness class
according to the characteristics of the production process, a three-level cleanliness guarantee system is formed:

1. basic level application: suitable for ordinary power transmission, equipment purging and other scenarios, air cleanliness:
   • particulate matter concentration ≤ 1 million/m3 (corresponding to ISO 8573-1 Class 6)
   • total oil content ≤ 5 mg/m3
   • pressure dew point ≤ 10 ℃
2. industrial applications: in the field of machining, surface treatment, etc., to meet:
   • particulate matter concentration ≤ 100000/m3 (Class 5)
   • total oil content ≤ 1 mg/m3
   • pressure dew point ≤-20 ℃
3. precision applications: For high-tech industries such as medicine and electronics, the requirements are:
   • particulate matter concentration ≤ 1000/m3 (Class 1)
   • total oil content ≤ 0.01 mg/m3
   • pressure dew point ≤-70 ℃

3. cleanliness guarantee technology path
gradient technical solutions are required to achieve different levels of cleanliness:

1. basic treatment: the configuration of the main pipeline filter, the use of centrifugal separation + coarse filtration technology, can remove more than 90% of the particles above 5 microns.
2. Deep purification: In precision applications, precision filters, activated carbon adsorption devices and freeze dryers are used in series to form a multi-stage barrier.
3. Special process: For ultra-pure gas requirements, a membrane separation device or a catalytic oxidation device is required to achieve nanoscale particle control.

4. Operation Monitoring and Management
it is recommended to establish a three-level monitoring system:

1. on-line monitoring: installation of particle counter, dew point meter and other equipment, real-time display of key parameters and set the limit alarm.
2. Regular testing: Compressed air quality testing commissioned quarterly professional institutions, issued with CNAS certification test report.
3. Trend analysis: Establish cleanliness data files, and identify equipment performance attenuation trends through SPC statistical process control technology.

Enterprise selection should be based on specific process requirements to determine the cleanliness level, to avoid excessive configuration or insufficient protection. For new projects, it is recommended to carry out CFD simulation of compressed air system, optimize pipeline layout and filter configuration, and maximize system energy efficiency while ensuring cleanliness. During operation, a preventive maintenance system shall be established, the filter element shall be replaced regularly, and the monitoring instrument shall be calibrated to ensure that the compressed air quality always meets the process requirements.