5.2 Flow of Food & Equipment Handling

The path that food takes from the time an establishment purchases it until the moment it is served to a customer is known as the Flow of Food. Hazards threaten food safety at every single link in this operational chain. Food handlers must recognize that cross-contamination and time-temperature abuse can occur at any phase if strict monitoring and preventive controls are not enforced.

The Nine Operational Steps in the Flow of Food

To manage safety effectively, food handlers must understand the nine distinct stages comprising the flow of food:

1. Purchasing: Buying ingredients from approved, reputable suppliers that meet federal, state, and local regulatory standards.
2. Receiving: Inspecting shipments promptly upon arrival for correct temperature, packaging integrity, and absence of pest evidence.
3. Storing: Moving items immediately into designated dry, refrigerated, or frozen storage areas adhering to proper spacing and shelf hierarchies.
4. Preparing: Thawing, washing, chopping, and mixing ingredients using clean, sanitized equipment to prevent cross-contamination.
5. Cooking: Heating TCS foods to mandatory minimum internal temperatures for specified holding times to eliminate pathogens.
6. Holding: Maintaining hot TCS foods at ≥135°F (57°C) or cold TCS foods at ≤41°F (5°C) during display or service.
7. Cooling: Safely dropping cooked TCS food temperatures from 135°F to 41°F or lower within two distinct time stages totaling 6 hours.
8. Reheating: Rapidly heating previously cooked and cooled TCS food to an internal temperature of 165°F (74°C) for 15 seconds within 2 hours.
9. Serving: Presenting food to guests using clean utensils, proper bare-hand contact barriers, and hygienic customer-facing procedures.

Purchasing ➔ Receiving ➔ Storing ➔ Preparing ➔ Cooking ➔ Holding ➔ Cooling ➔ Reheating ➔ Serving

Receiving Inspections and Temperature Acceptance Criteria

Receiving is the critical control point where an establishment takes custody of raw ingredients. Delivering drivers must allow kitchen staff to inspect vehicles and measure product temperatures before accepting delivery.

Delivery Vehicle and Container Inspections

Before unloading, check the delivery vehicle's cleanliness and refrigeration setting. Reject shipments if truck interiors are dirty, contain chemical spills, exhibit foul odors, or show signs of pest infestations (such as gnawed boxes or droppings).

Temperature Requirements for Incoming Food

Food handlers must use a clean, calibrated bimetallic stemmed thermometer or thermocouple to check product temperatures during receiving:

• Cold TCS Food: Must arrive at 41°F (5°C) or lower (e.g., fresh meats, poultry, cut melon, leafy greens).
• Exceptions (Air Temp 45°F / 7°C): Milk, shell eggs, and live shellfish (mussels, clams, oysters) may be received at an ambient air temperature of 45°F (7°C) or internal product temperature of 45°F, provided they are cooled to 41°F (5°C) or lower within 4 hours of receipt.
• Hot TCS Food: Must arrive at 135°F (57°C) or higher (e.g., hot catered meals, cooked soup deliveries).
• Frozen Food: Must arrive frozen solid. Reject frozen deliveries if you observe ice crystals, frozen liquids, or water stains on cartons. These signs prove that the food melted or thawed during transit and was subsequently refrozen—a severe time-temperature violation.

Shellstock Identification Tags

Raw bivalve molluscan shellfish (oysters, clams, mussels) carry risks of marine toxins and viral pathogens such as Norovirus. Federal regulations dictate that shellfish deliveries must arrive with official shellstock identification tags attached to the container.

The 90-Day Retention Rule

1. Keep Tag Attached: The shellstock tag must remain physically attached to the container or sack until the very last shellfish is removed and sold or served.
2. Record Date: As soon as the final shellfish is used, write the exact date on the tag.
3. File and Retain for 90 Days: Keep the tag on file in the establishment for 90 calendar days from the date recorded on the tag. This 90-day retention period allows public health officials to trace back outbreaks of shellfish-borne illness to the exact harvest location and water body.

Preventing Cross-Contamination During Food Preparation

Food preparation is the stage where raw ingredients are most frequently handled. Without strict discipline, biological contaminants from raw meat, poultry, or unwashed produce can easily transfer to ready-to-eat foods.

1. Equipment Separation & Color-Coded Systems

Establishments should assign dedicated equipment for specific food categories. Utilizing a color-coded cutting board and utensil system provides a clear visual signal to staff:

• Red: Raw red meat (beef, pork, lamb)
• Yellow: Raw poultry (chicken, turkey)
• Blue: Raw seafood and fish
• Green: Fresh fruits, vegetables, and herbs
• White: Bakery items, cheeses, and ready-to-eat foods
• Brown: Cooked meats and roasted items

2. Cleaning and Sanitizing Between Tasks

If dedicated equipment is unavailable, food handlers must thoroughly wash, rinse, and sanitize all work surfaces, cutting boards, knives, and prep sinks between handling different raw items and before touching ready-to-eat food. For example, after trimming raw chicken breasts on a cutting board, the board cannot simply be wiped with a damp cloth—it must be scrubbed with detergent, rinsed with clean water, and treated with an approved chemical sanitizer (such as chlorine or quaternary ammonium) for the mandatory contact time before slicing tomatoes on it.