Prepared by: Syafiq Rabbani Mohd Hashim

Assistant Engineer,

Department of Food Technology,

Faculty of Food Science and Technology, UPM

In the modern food technology landscape, the steam boiler stands as a critical, yet often unseen, component. It is far more than a simple heating machine; it is the "heart" that supplies clean, efficient thermal energy to ensure food products are safe, high-quality, and shelf-stable. From sterilizing canned goods to perfecting the texture of snacks, the use of steam is universal.

This article explores the vital role of steam, the specialized equipment that relies on it, specific requirements for laboratory settings, and the legal necessity of hiring qualified personnel to manage these systems.

1. What is a Steam Boiler and Its Role in Food Tech?

A steam boiler is a closed vessel where water is heated under high pressure to produce steam. This steam carries a massive amount of thermal energy and can transfer it rapidly and evenly to food products. This makes it the most popular heat transfer medium, surpassing hot air or oil in efficiency.

In the food industry, steam quality is categorized into two main types:

• Plant Steam (Industrial Steam): Used for indirect heating via tank jackets or heat exchangers. It never comes into direct contact with the food.
• Culinary Steam: Steam that has been filtered to remove rust, scale, or boiler chemicals, allowing it to come into direct contact with food (e.g., direct steam injection).

 

2. Key Equipment Powered by Steam Boilers

Many food processing machines depend entirely on a steady steam supply. Some of the most vital include:

• Retort Machine (Industrial Autoclave): Acting like a giant pressure cooker, it sterilizes food in cans or pouches at high temperatures to kill pathogens and extend shelf life without preservatives.
• Vacuum Evaporator: Concentrates liquid products (like milk or juice) by removing water at lower temperatures under vacuum pressure using steam heat to preserve flavor and nutrients.
• Steam Oven: Unlike standard ovens, these use steam injection to ensure baked goods like bread or meats remain moist, achieve a perfect crust, and reduce product shrinkage.
• Drum Dryer: A rotating heated cylinder that converts food slurries (like mashed potatoes) into dry flakes or powder in a matter of seconds.

 

Process Chart Overview: The cycle begins with water treatment, enters the boiler to be turned into steam, is distributed to the equipment mentioned above, and finally, the resulting condensate is returned to the system for maximum energy efficiency.

 

 

3. Specific Requirements for Food Technology Labs

For laboratory use—whether in universities or R&D centers—boiler selection focuses on convenience, speed, and footprint:

• Electric Steam Boiler: The top choice for labs because it is clean (no combustion/fumes), quiet, and "Plug & Play," requiring no chimneys or complex gas piping.
• Steam Generator (Instant Boiler): Produces steam in less than 5 minutes. It is highly favored for research environments due to its high safety profile and low water volume.

 

4. Why Qualified Personnel are Mandatory

In many regions, including Malaysia (under DOSH/JKKP regulations), operating a steam boiler is strictly governed by law. Failure to comply can lead to heavy fines or, in worst-case scenarios, catastrophic industrial accidents.

Key roles include:

1. Competent Person (Boilerman / Steam Engineer): A certified professional (Grade 1 or 2) is required to monitor water levels, pressure, and safety valves at all times.
2. Responsible Person (OYB): An officer assigned to maintain service logs and ensure the boiler undergoes its mandatory statutory inspections.
3. Certificate of Fitness (PMT/PMA): Every boiler must be inspected by government authorities typically every 15 months to renew its legal operating license.

 

Conclusion

The steam boiler is the invisible backbone ensuring our food supply is safe and consistent. Understanding the entire process—from water source to the final processing machine—is the key for any food technology professional to ensure a safe, productive, and legally compliant operation.

References

1. Legal & Safety References (Malaysia)

Crucial for the "Qualified Personnel" and licensing sections:

• Factories and Machinery Act 1967 (Act 139): Specifically the Steam Boiler and Unfired Pressure Vessel Regulations.
• Occupational Safety and Health Act (OSHA) 1994: Regulations regarding the management of workplace safety.
• DOSH (JKKP) Guidelines: Official guidelines from the Department of Occupational Safety and Health Malaysia regarding the inspection and maintenance of steam boilers.

 

2. Food Quality & Sanitary Standards

For the "Culinary Steam" and food safety sections:

• FDA (U.S. Food and Drug Administration): Specifically 21 CFR 173.310, which regulates secondary direct food additives permitted in steam used in contact with food.
• 3-A Sanitary Standards: International standards for the design of food equipment (including boilers and heat exchangers).
• ISO 22000 / HACCP: Standard operating procedures to ensure steam does not become a source of contamination (hazard) in food

Date of Input: 07/05/2026 | Updated: 07/05/2026 | nurulizzah