Hygienic Design Considerations for Fluid Heaters

Fluid heaters are widely used in the food processing industry to heat water and other fluids, primarily for disinfection and cleaning purposes. Because the final product produced is intended for human consumption, great care must be taken to ensure that the heated fluids are free of any pathogens or microorganisms that could cause illness.

When designing a fluid heater for food processing, there are several important design considerations. The first and most important goal is to eliminate possible locations within the heater where contamination could occur and pathogens could grow. The second goal is to design a heater that is designed for effective clean-in-place (CIP) operations when the heater is used in production.

Preventing contamination in a fluid heater boils down to two simple goals. First, the fluid path through the heater must be designed to eliminate possible locations where contaminants could accumulate. For example, threaded connections between the heater's wetted parts provide ideal locations for possible contamination and pathogen growth. Using non-threaded fittings, such as a tri-clamp design, can eliminate these sources of contamination. Many heaters available on the market claim to use sanitary connections, but most still use threaded or flanged connections from the heater element to the housing. This approach does not produce a truly sanitary design. Instead, tri-clamps should be used at all connection points within the heater.