When Air Touches the Product: Food Safety and Compressed Air in Agro-Industrial Processing

The Problem You Cannot See

Compressed air is not ambient air. During compression, the concentration of contaminants present multiplies proportionally: particulate matter, moisture, and oil vapor that would be imperceptible under normal conditions become, within a compressed air system, a real food safety hazard.

The three primary contaminants that may be present are:

• Particulate matter: originating from pipework, the compressor, and the air intake. Includes dust, rust, and metallic debris.
• Moisture: promotes microbial growth — bacteria, yeasts, and molds — within production lines.
• Oil carryover: generated by lubricated compressors or inadequate filtration. Can contaminate the flavor, odor, and food safety integrity of the finished product.

The core issue is that these contaminants are not always visible. A production line may operate with out-of-spec compressed air for weeks without detection — until the damage is already done.

What the International Standard Requires

ISO 8573-1:2010, published by the International Organization for Standardization, establishes compressed air purity classes based on the type and concentration of three contaminants: particulate matter, water, and oil. This standard is the primary reference for specifying and verifying air quality in industrial systems, regardless of the measurement point within the system.

For the food and agro-industrial sector, processes involving sensitive operations require a minimum air quality of Class 2:2:1, where Class 1 for oil guarantees no residual contamination affecting the flavor, odor, or food safety of the product.

In applications where air comes into direct contact with food — such as blow-off of fruits and vegetables, cutting, or pneumatic conveying — achieving Class 0 for oil, the most stringent level in the standard, is strongly recommended.

HACCP and Compressed Air as a Critical Control Point

The Hazard Analysis and Critical Control Points (HACCP) system — adopted internationally by the FAO/WHO Codex Alimentarius Commission — is the reference framework for identifying specific hazards in food production and establishing preventive control measures.

This scientifically grounded, systematic approach focuses on prevention rather than relying primarily on end-product testing. Within HACCP, compressed air must be designated a Critical Control Point (CCP) whenever it comes into direct contact with the product or with product-contact surfaces.

In Mexico, these principles are incorporated into NOM-251-SSA1-2009 — Hygiene Practices for the Processing of Food, Beverages, and Dietary Supplements — which establishes as a mandatory requirement for the Mexican food industry the application of Codex Alimentarius hygiene principles, including hazard analysis and critical control point management across all stages of the production process. Compliance is enforced by COFEPRIS (Federal Commission for Protection against Sanitary Risks).International food safety certification schemes such as IFS, BRC, and ISO 22000 explicitly recommend incorporating compressed air into the company’s HACCP plan, establishing verifiable and documented critical quality limits.

The Screw Compressor: The Backbone of a Running Plant

In medium- and large-scale agro-industrial operations, the oil-free rotary screw compressor is the most suitable equipment for meeting these requirements. Its operating principle — two helical rotors compressing air without direct contact between them — eliminates oil contamination at the source.

Compressed air systems used in food processing represent the fourth most widely used energy source in this sector, after electricity, gas, and water. This position reflects the true operational scope of compressed air: it is present at virtually every stage of the process, from raw material intake through finished product sealing.

Rotary screw compressors offer concrete operational advantages for this type of facility:

• Continuous, stable flow delivery: unlike reciprocating piston compressors, they generate no pressure pulsations affecting downstream point-of-use pressure.
• Low-noise, low-vibration operation: compatible with production environments where noise and vibration can impact sensitive equipment.
• Reduced maintenance requirements: fewer moving parts translate into higher reliability and fewer unplanned downtime events.

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System Designed for Your Plant’s Real-World Requirements

Not all production lines share the same specifications. Required flow rate (FAD), simultaneous point-of-use demand, operating pressure, and purity class requirements vary according to product type, process design, and the certifications the company must maintain.

That is why the starting point is always understanding the actual operation before selecting the equipment. Our application specialists can help you identify the right solution for your plant: cbscompresores.com.mx/contacto

Frequently Asked Questions

Why is compressed air a food safety hazard in a processing plant?

Because compressed air is not ambient air: during compression, the concentration of contaminants multiplies proportionally. Particulate matter, moisture and oil vapor that would be imperceptible under normal conditions become a real food safety hazard inside a compressed air system.

What are the main compressed air contaminants in food processing?

Three: particulate matter from pipework, the compressor and the air intake; moisture, which promotes bacteria, yeast and mold growth in production lines; and oil carryover from lubricated compressors or inadequate filtration, which can affect flavor, odor and food safety.

What compressed air quality does the food industry require?

ISO 8573-1:2010 defines the purity classes. Processes involving sensitive operations require a minimum of Class 2:2:1. Where air comes into direct contact with food — blow-off of fruits and vegetables, cutting or pneumatic conveying — Class 0 for oil is strongly recommended.

Should compressed air be part of the HACCP plan?

Yes. Within HACCP, compressed air must be designated a Critical Control Point whenever it comes into direct contact with the product or with product-contact surfaces. Certification schemes such as IFS, BRC and ISO 22000 explicitly recommend it.

Why an oil-free rotary screw compressor for agro-industrial plants?

Because two helical rotors compress the air without direct contact between them, eliminating oil contamination at the source. They also deliver continuous, stable flow with no pressure pulsations, run with low noise and vibration, and need less maintenance thanks to fewer moving parts.