Compressed Air Testing Food Industry
Fast-Moving Consumer Goods (FMCG) companies follow strict regulations on cleanliness and contamination prevention during production.
They must ensure that all equipment, operational facilities, and compressed air systems meet the rigorous safety and hygiene standards set by both local and international regulatory organizations.
Contaminated air, for one, can introduce unwanted moisture, bacteria, and particulates, all of which may compromise valuable machinery and sensitive products.
For food producers, in addition to contamination incidents, unclean air can lead to costly recalls, health risks, and compliance issues.
Understanding the importance of compressed air testing, how it works, which standards to follow, and when to perform them can help protect your business and your consumers’ safety.
What Is Food Grade Compressed Air?
Compressed air used in manufacturing is created by squeezing regular air into a smaller space using a compressor. This increases the air pressure, converting it into a sustainable yet powerful energy source.
However, because compressors draw in ambient air, concentrations of pollutants can be mixed into the compression process.
Using an oil-free compression and a multi-stage filtration setup is necessary to make compressed air food-grade. The treatment process removes excess moisture, microorganisms, oil vapors, and unwanted particulates. It ensures the compressed air meets industry standards mandated by the SQF, FDA, and ISO.
Why Compressed Air Quality Matters in Food Manufacturing
Many businesses rely on compressed air for several manufacturing processes, including powering pneumatic tools, automating material handling, and even for cleaning and maintenance.
Direct and Indirect Product Contact Risks
During food and beverage production, pneumatic systems are used for many critical tasks such as mixing, cutting, sorting, moving, filling, coating, and packaging.
In other words, pneumatic-powered systems can come into direct and indirect contact with the consumable goods in many stages of production.
Due to their proximity, these systems require clean, high-quality compressed air free of impurities to prevent cross-contamination, financial losses, and regulatory concerns.
Ready-to-Eat Food and High-Risk Environments
Ready-to-eat (RTE) goods demand clean environments because consumers can eat them without cooking.
Contamination, in this case, can be particularly dangerous because there will be no opportunity to eliminate bacteria and contaminants after they hit the shelves.
The 1985 and 1999 Listeria outbreaks from contaminated cheese and hot dog products that killed dozens of individuals are a major example of the serious risks associated with pre-prepared goods.
Food safety auditors treat compressed air systems as a possible hazard and must be included in Hazard Analysis and Critical Control Points (HACCP) guidelines.
Oil, Moisture, Microbial, and Particulate Contamination Risks
Various contaminants can degrade compressed air, compromising food and beverage production safety and hygiene. These pollutants include:
- Oil and hydrocarbons
- Moisture and excess vapor
- Bacteria, viruses, fungi, yeasts, and molds
- Dust, dirt, and pollen particles
Oil, a common culprit, can come from lubricants from old compressor systems. It can alter the taste and smell of consumables. Not to mention damage sensitive equipment.
Excess moisture condensing inside distribution pipes can be a breeding ground for microorganisms. Airborne particulates from the surroundings clog filters and impede operations.
Food Safety Standards for Compressed Air
Food safety regulations exist to protect consumers from food-borne illnesses. Because FMCGs make goods for human consumption, few industries face regulatory requirements as demanding as theirs.
ISO 8573 Food Grade Air Standards
The International Organization for Standardization (ISO) is among the leading and most respected bodies that define “clean,” food-grade compressed air in the food production industry.
ISO 8753 1 compressed air measures purity based on particulate, water, and oil content, outlining 9 (0 to 8) classifications.
Food manufacturing facilities are generally expected to maintain an ISO Class 1 or higher for pneumatic systems that directly touch consumables.
SQF, GFSI, FDA, and cGMP Requirements
In addition to ISO, the Safe Quality Food (SQF), the Global Food Safety Initiative (GFSI), and the US Food and Drug Administration (USFDA) also provide frameworks for compressed air quality.
The GSFI and the SQF programs focus on food safety and ongoing monitoring and documentation. Pneumatic systems must not contribute pollutants to the consumable goods.
The USFDA expects food manufacturers to establish and implement preventive controls to lower the risks of contamination. This includes maintaining high-purity air.
Furthermore, businesses must follow Current Good Manufacturing Practices (cGMP) and enforce strict staff hygiene, ensure sanitary facilities, and use clean compressors.
Retail Audit and Documentation Expectations
Retailers and food brands may require food production companies to demonstrate compliance with relevant food safety standards. This usually means partnering with a third-party air tester.
Auditors may ask for recent air testing results, sampling records, risk assessments, corrective action reports, and maintenance logs.
What Food Grade Compressed Air Testing Includes
Compressed air testing not only evaluates purity, but also whether the system is functioning in accordance with existing operational metrics.
Here are some of the testing instruments and methodologies that an accredited laboratory can employ during assessments.
Moisture and Dew Point Testing
Apart from promoting bacteria, excess moisture is especially problematic because it encourages rust and corrosion.
Testing for moisture and dew point helps you determine whether your air dryers and membranes are working as they’re intended.
To measure moisture, technicians typically use detection cubes, ISO 8573-compliant hygrometers, and spectroscopic analysis.
Dew point is the temperature at which vapor turns into liquid water. The ideal temperature for compressed air systems can vary, but you generally want a lower dew point.
Oil Mist and Hydrocarbon Detection
The presence of oil vapor and hydrocarbons degrades internal seals that may result in contamination issues. Even oil-free compressors can still contain trace amounts of these pollutants.
Detecting them is essential in food processing. An air sample is usually analyzed in a laboratory to determine whether or not oil aerosol is present.
Microbial and Toxic Gas Testing
Microbial testing identifies bacteria, viruses, fungi, and other microorganisms in compressed air.
Facilities that manufacture ready-to-eat food and beverages usually prioritize this evaluation, as these living contaminants can spread rapidly.
Gas detection for toxic fumes, such as carbon monoxide and nitrogen oxides, may also be required, depending on the compressor type and air application.
Particulate and Particle Count Analysis
Dust, dirt, and pollen spores can cause significant problems in parts of the system where clean air is critical.
Diagnostic testing for air particulate concentrations can be done using two methods: installing a laser particle counter or setting up microscopic filters to capture pollutants larger than 0.1 microns.
Pressure and Flow Rate Verification
Verifying air pressure (PSI) and flow rate (CFM) is another way to catch issues in pneumatic systems in food production. Technicians use mass flow meters and pressure gauges for these metrics.
Pressure drops and fluctuating CFM can mean clogs in compressor filters or piping, causing the entire system to underperform.
GMP Design Requirements for Compressed Air Systems
Good Manufacturing Practices (GMP) outlines requirements for compressed air systems used in food processing facilities, stressing non-contaminating designs.
Drying Systems and Moisture Control
Setting up sufficient drying systems is a key aspect of GMP-compliant compressors. This helps minimize moisture before air enters the system and achieve optimal dew point.
There are several types of dryers, depending on what the production requires. Desiccant, membrane, and refrigerated dryers are recommended.
Condensate drainages are also crucial to prevent standing water from pooling and becoming a breeding ground for bacteria and viruses.
Point of Use Filtration and Critical Control Points
Point-of-use filtration provides an extra layer of protection by filtering oil, moisture, bacteria, and dust before they reach sensitive consumable products.
These locations are generally considered critical control points because contamination is usually higher at the point of use.
Maintenance and Sanitation Best Practices
Regardless of design quality, compressed air systems used for food processing must be maintained and sanitized frequently. This is in line with GMP and other food safety regulations.
Preventive maintenance can include:
- Examining dryer performance
- Checking for signs of lubrication issues
- Unclogging distribution piping systems
- Looking for and repairing leaks
- Cleaning or replacing filters every 3 to 6 months
- Draining condensate regularly/daily
A multi-point POU filtration system is highly effective in improving sanitation. Establishing a preventive maintenance schedule helps maintain air quality and continued compliance.