Where is the flow diversion device (FDD) located in an HHST pasteurizing system?

In a High-Temperature Short-Time (HTST) pasteurization system, the flow diversion device (FDD) is strategically placed downstream from the cooling section. This positioning is crucial for ensuring that only pasteurized product continues through the system while unpasteurized product can be redirected. The FDD plays a vital role in maintaining the integrity of the pasteurization process by providing a means of diverting the flow of liquid based on whether the product has reached the required pasteurization temperature.

In this location, the FDD is able to effectively monitor the temperature of the product after it has been subjected to heat treatment and has cooled down. If the product is found to be insufficiently heated, the FDD can divert it back to the heating section, preventing any unpasteurized liquid from reaching the final output. This ensures that safety standards are met and that public health is protected.

The other choices do not correctly represent the operational and safety requirements of the HTST pasteurizing system. For instance, placing the FDD upstream from the heating section or before the initial heat exchanger would not allow for proper monitoring after the pasteurization process and would pose risks of unpasteurized product being sent for distribution. Thus, the correct placement of the