Heat Tracing for Food and Beverage Plants: Hygiene and Temperature

Food and beverage plants need heat tracing for two different reasons: freeze protection of water and utility lines, and temperature maintenance of process lines carrying viscous or temperature-sensitive products. Hygiene and cleanability add constraints that industrial piping does not have.

Where it is used

• Water and utility lines exposed to freezing
• Sugar syrups, glucose, molasses and concentrates (viscosity management)
• Fats, oils and chocolate lines (crystallisation and solidification)
• CIP and cleaning solution lines in cold areas
• Ingredients that separate or crystallise below a certain temperature

Design points

1. Maintain temperature is product-specific

Sugar syrup, chocolate and fats each have their own temperature window. Too cold causes solidification; too hot can change taste, colour or product quality. Confirm the window with the process team.

2. Hygiene and cleanability

Tracing and insulation must allow cleaning and inspection. Avoid designs that trap product or cleaning water; use hygienic insulation finishes and sealed cable entries where required.

3. Avoid local overheating

Overheating can caramelise sugar or scorch product. Use line-temperature control, avoid overlapping cable and check the power density on small lines.

4. CIP compatibility

Cleaning cycles use hot water or chemicals; the tracing system must survive them. Cable jackets, terminations and sensors should be suitable for the cleaning regime and the chemicals used.

5. Condensation and wet areas

Washdown areas are humid; junction boxes and terminations must be moisture-tight and mounted clear of washdown and standing water.

6. Hazardous areas

Flour dust, sugar dust or solvents may create a hazardous area; check the area classification before selecting cable and enclosures.

Common mistakes

• Using a single thermostat set point for products with different windows.
• Standard industrial insulation that cannot be cleaned or replaced hygienically.
• Overheating small lines because power density was sized for a large pipe.
• Terminations inside washdown zones without adequate protection.
• Ignoring dust hazard classification in dry ingredient areas.

What to provide for a quotation

Topic hub: Heat Tracing by Industry (Applications)