Standard Specification for Compressed Air Class

Description of technical specifications concerning the quality classification of compressed air

in the field of compressed air applications, the industry has developed air quality classification standards to ensure the reliability of gas use in different scenarios. The standard provides a basis for equipment selection and system design by quantifying key indicators, and the specific specifications are as follows:

1. core quality indicators

1. solid impurity control
   is required to filter small solids such as dust and metal debris in the air, and different filtration accuracy is set according to the application scenario. For example, ordinary industrial gases allow a small amount of micron-sized particles, while precision electronics manufacturing needs to be filtered to the sub-micron level.

2. humidity management
   controls the water vapor content in the air through drying equipment to prevent condensed water from corroding equipment or affecting product quality. The humidity control level is divided into different levels such as basic drying (dew point -20 ℃) and deep drying (dew point -40 ℃).

3. oil purification
   sets the oil content limit for the residual problem of lubricating oil. Ordinary scenes allow trace oil content (such as 0.1 mg/m & sup3;), while medical and food industries need to achieve nearly oil-free state (below 0.01 mg/m & sup3;).

2. Application Scenario Classification

1. basic industrial
   is suitable for tire inflation, general pneumatic tools and other scenarios, the air quality requirements are low, allowing a small amount of impurities and oil.

2. precision manufacturing
   covers scenarios such as electronic component assembly and precision instrument purging, requiring control of submicron particles and low humidity environments.

3. special industry categories
   , including medical gas supply, food packaging, pharmaceutical processes, etc., require near oil-free, dust-free and deeply dry air quality.

3. Device Configuration Recommendations

1. the filtration system
   is equipped with multi-stage filters according to the impurity control requirements: primary filter large particles, intermediate filter fine impurities, and final filter micron particles.

2. the basic scene of the drying device
   can use a freeze dryer, and the precision scene needs to be matched with an adsorption dryer to achieve deep dehumidification.

3. oil treatment
   In scenarios with strict oil control requirements, a catalytic oil removal device or an activated carbon filter should be installed at the rear end of the air compressor.

4. quality verification method

1. regular sampling and detection
   . Solid impurities are detected by laser particle counter, humidity is measured by dew point meter, and oil content is analyzed by infrared spectrophotometer.

2. the online monitoring system
   installs sensors at key gas supply nodes to monitor parameters such as pressure, humidity and oil content in real time to ensure continuous compliance with standards.

5. Management Maintenance Requirements

1. the replacement cycle
   of the filter element is set according to the gas load, usually every 2000-4000 hours, and the cycle needs to be shortened when the dust is large.

2. the desiccant regeneration
   dryer needs to be heated and regenerated regularly to restore its moisture absorption performance, and the regeneration cycle is generally 8 hours.

3. the system leak check
   shall use the ultrasonic leak detector to detect the pipeline connection every month, and repair the leak point in time to maintain the system pressure stability.

this specification is applicable to the quality control of conventional compressed air system. Special scenarios (such as high-purity gas supply) shall be implemented according to special standards.