ISO Scope of Application and Gas Type Specifications of Standard 8573-1:2010
ISO ISO 8573-1:2010 is the core standard published by the International Organization for Standardization concerning the purity classes of compressed gas contaminants. It should be clarified that the standard’s primary scope of application is primarily directed towardCompressed airHowever, in industrial practice, owing to the scientific rigor and meticulousness of its grading system, the purity grade requirements specified in this standard have been widely extended and referenced for application in…Nitrogen…in the quality control of argon and other compressed gases.
The standard’s strict definition of “total oil content”
When addressing the control of oil content in nitrogen, it is essential to accurately understand the standard’s definition of “oil.” ISO The oil content specified in 8573-1:2010 does not refer solely to liquid oil, but rather toTotal oil quantity (Total oil)The total oil volume comprises the sum of the following three forms:
- Oil vapor: Hydrocarbon substances that are gaseous at standard temperature and pressure.
- Liquid oilOil existing in the form of droplets.
- Aerosol (oil mist): Tiny oil droplet particles suspended in a gas.
This means that, when assessing the oil content in nitrogen, it is necessary to comprehensively measure and control all three forms of oil.
Classification of Nitrogen Purity Based on Oil Content
Reference for Industrial Applications ISO When controlling the oil content in nitrogen according to ISO 8573-1:2010, the total oil‑content purity classes specified in the standard are typically used. The specific limit values for each class are as follows:
- Class 0 (Level 0): The standard does not specify a particular numerical value. This grade denotes the purity requirements as defined by the equipment manufacturer or supplier, which must be more stringent than Class 1. Specific indicators shall be determined through consultation between the supplier and the demander.
- Class 1 (Level 1)Total oil content ≤ 0.01 mg/ m³.
- Class 2 (Level 2)Total oil content ≤ 0.1 mg/ m³.
- Class 3 (Level 3): Total oil content ≤ 1 mg/ m³.
- Class 4 (Level 4)Total oil content ≤ 5 mg/ m³.
- Class 5 (Level 5)Total oil content ≤ 25 mg/ m³.
Note: The concentrations listed above all refer to mass concentrations under standard atmospheric pressure and standard temperature conditions.
Recommendations for Controlling Oil Content in Nitrogen Used in Industrial Applications
In practical nitrogen generation and delivery systems, oil content control must be graded according to the end application:
- Food and Pharmaceutical Industry: Extremely high gas purity is typically required, generally needing to reachClass 1Even negotiating to establish stricterClass 0Standards to prevent oil contamination from compromising product safety.
- Electronics and Precision Manufacturing: Sensitive to trace oil contamination, typically required to be controlled withinClass 1ToClass 2Between.
- General industrial purging or power generation: Has relatively lenient requirements for oil content,Class 3ToClass 5This is sufficient to meet standard requirements.
To ensure that the oil content in the nitrogen meets the selected grade, the system must be equipped with oil‑removal filters of the appropriate filtration efficiency, and gas purity should be monitored regularly to keep the total oil content under control at all times.