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The importance of hygienic design: A process facility case study and checklist 21Phase 2. Project pre-engineering: DesignThe objective of this phase is to have hygienic designprinciples established for location and layout, piping andinstrumentation, and supplier specications.1. Location and layout determination. This involves threehygienic design principles, as followsa. Hygienic design principle 1:Separation. In the case of the cream cheese facility, a newlayout of the facility was needed in order to meet the thehygienic design principles. Determining a new layout, in thisexample, took into account the following considerationsSpace availability within the existing facilities.Physical separation between the raw area andpasteuriser area.Allergens segregation.b. Hygienic design principle 7:Proper ventilation and utility air. In order to ensure theproper ventilation of the different areas of the facility, thefollowing considerations need to be taken into accountAir quality (i.e., ltration requirements according toproduct sensitivity).Proper design of the installation that preventscondensation.Location of the supply and extraction systems areproperly located to avoid product contamination, andventilation system (i.e., fans) are properly located(Figure 5). Entrances for people to the manufacturing lineFigure 5. Ventilation map. Entrances for people to the manufacturing lineFigure 3. Initial layout of the cream cheese manufacturing facility.As a result of the evaluation, a new layout was proposed forthe facility (Figures 3 and 4).c. Hygienic design principle 2:Cleanability. It is essential that the position of the drains inthe processing room is 100% compatible with the layout ofthe processing line. For this specic case, it was possibleto t the layout of the processing line to the drains locationin the room (Figure 6). Entrances for people to the manufacturing lineFigure 4. Final layout of the facility after hygienic designevaluation. Entrances for people to the manufacturing lineFigure 6. Processing line and room layout in alignment with properpositioning of drains in processing room.