Ensuring Safety in Food Processing Plants: A Comprehensive Guide by PMG Engineering

In the dynamic food production industry, maintaining safety standards isn't just a regulatory requirement; it's a commitment to safeguarding employees, preserving product integrity, and ensuring uninterrupted operations. At PMG Engineering, we are committed to providing world-class food factory design and food plant engineering services, including comprehensive safety protocols that prevent accidents and promote safe operations in any food manufacturing environment.

Understanding Typical Incidents

Operational Incidents

• Ammonia release during refrigerating system operation often occurs when a pressure relief valve opens due to system failure, venting ammonia into areas like compressor rooms.
• Condenser pressure increases when overheating protection trips, but if the pressure switch doesn't operate, this can lead to elevated compressor pressure and ammonia releases.

Repair and Maintenance Incidents

• Improperly managed temperature rises during defrosting can exceed valve pressures, leading to ammonia releases into machinery rooms.
• Use of inappropriate tools, like tapping ice with a spanner, can cause coolant pipes to rupture, resulting in ammonia leaks if compressors aren't promptly stopped.

Installation and External Factors

• Over-tightening or improper installation of gaskets and valves can lead to ammonia leaks. Similarly, misinstalled compressor gaskets and external pipe corrosion can cause significant leaks.

Fire and Explosion Hazards

• Fire incidents often damage ammonia piping, causing leaks, even though ammonia itself is non-flammable.
• Inadequate isolation and ventilation can cause ammonia concentrations to rise, exposing employees to hazardous conditions.

Accident Prevention and Safe Operation

Operator Guidance and Training

According to SFS-EN 378 standards, it's imperative that suppliers or installers provide comprehensive training to operating staff. Training covers system equipment, functioning, and emphasizes operation instruction compliance. Staff should be involved in system assembly, evacuation, refrigerant filling, and testing. Properly displayed operating instructions are essential.

Key Operating Instructions

• Contact information for suppliers, installers, and maintenance companies.
• Details on refrigerant names, fill amounts, and system usage.
• Descriptions, part lists, process and instrumentation diagrams.
• Simple instructions for system start/stop, refrigerant handling, and pressure management.

Ensuring System Safety

• Isolation Valves: Proper use and marking of manual/automatic isolation valves per SFS-EN 378 to minimize hazards.
• Gas Sensors: Installation and integration into control systems, especially near relief lines, to detect ammonia leaks promptly.
• Pressure Relief Valves: These are vital for maintaining system pressure and should be positioned away from air intakes.
• Ventilation Systems: Proper room ventilation prevents ammonia from spreading, reducing the risk of flammable gas mixtures.

Emergency Instructions and Preparedness

Internal Emergency Planning

Effective accident prevention involves training personnel in emergency response as part of an internal emergency plan. This includes:

• Understanding ammonia behavior and sensor actions.
• Recognizing gas release signs and making emergency calls.
• Positioning assembly areas and emergency access for fire brigades.
• Conducting personal training and regular emergency exercises.

Checklist for Safety

• Verify proper training for all employees handling hazardous materials.
• Ensure the availability of safety equipment, such as goggles, full-face masks, and self-contained air masks.
• Conduct regular checks on storage tanks, valves, relief systems, and piping quality.
• Confirm the identification and functioning of emergency equipment like fire extinguishers and excess flow checks.

Conclusion

Maintaining safety in food processing plants is paramount for any food industry consultant or engineering consultant aiming to deliver reliable and secure food manufacturing solutions. At PMG Engineering, we provide expert food business consultancy services to design, assess, and enhance the safety of food processing plants through effective engineering and training methodologies.