Why compressed air quality matters

Compressed air is used in a wide range of industries – from food and beverage to pharmaceuticals, electronics, and automotive manufacturing. Contaminants such as water vapor, oil, and particulates can compromise product quality, damage equipment, and even pose safety risks. Poor air quality can lead to unplanned downtime, increased maintenance costs, and product recalls in regulated industries.

For example, in a food processing plant, oil or moisture in the air line can contaminate packaging or ingredients, leading to health risks and regulatory violations. This example highlights the importance of tailoring air preparation to the specific needs of each application.

Additional Considerations:

• Energy Efficiency: Contaminated compressed air systems often require more energy to operate due to pressure drops and equipment wear. Maintaining clean, dry air reduces energy consumption and operational costs.
• Environmental Impact: Proper condensate management and oil removal prevent environmental contamination, helping companies meet sustainability goals.
• Safety: Contaminated air can cause malfunction of pneumatic tools or actuators, potentially leading to hazardous situations.

Understanding ISO 8573 and purity classes

The international standard ISO 8573 provides a comprehensive framework for measuring and classifying compressed air contaminants. It breaks down air quality into three main categories:

• Particulate – Solid particles like dust, rust, and scale.
• Water – Present as vapor, liquid, or aerosol.
• Oil – Including liquid oil, oil aerosols, and oil vapor.

Each category is assigned a class rating, with Class 1 being the highest quality. For example, ISO 8573-1:2010 is the most commonly referenced part of the standard, specifying the purity classes for compressed air. A typical classification might look like ISO 8573-1:2010 [1:2:1], meaning

• Class 1 for particles,
• Class 2 for water, and
• Class 1 for oil.