Qualifying temperature-controlled vehicles and shipping containers

EU GDP chapter 9 requires that temperature-controlled vehicles and equipment be qualified and that temperature during transport be monitored. WHO Annex 9 gives model guidance for the qualification of transport: define the requirement, test under worst-case conditions, and demonstrate performance across the expected duration.

Elements of a transport qualification

• Thermal profiles representing summer and winter routes, including door openings and delays.
• Sensor placement throughout the load space — front, rear, top, bottom, near doors and refrigeration units.
• Loaded configuration representative of real shipments.
• Duration at least equal to the longest expected journey.
• Acceptance criteria derived from product storage conditions.

For passive shippers, qualification tests the pack-out against an ambient profile chamber run; for active containers, the control system's ability to hold set point is tested across ambient extremes.

Three kinds of transport equipment, three kinds of qualification

The distinction matters because a passive shipper has no control system to test — its performance is entirely determined by the pack-out, and changing the payload, the coolant quantity, the conditioning time or even the void fill invalidates the qualification. An active unit can be adjusted; a passive one can only be re-qualified.

Ambient profiles, which is where transport differs from storage

A building varies over a season. A vehicle can cross 30 °C of ambient in a day, sit on a loading dock in the sun, then spend a night at −5 °C. Qualification therefore runs against defined ambient profiles rather than a single condition: a summer profile and a winter profile at minimum, each including the dwell periods that actually happen — time on the dock, time waiting for a delivery slot, and the worst realistic delay.

The delay is the parameter people underestimate. A shipper qualified for 48 hours and routinely delivering in 24 has margin; the same shipper on a Friday consignment that sits in a depot over a weekend does not, and that is the shipment that produces the excursion.

Running it

• Sensor placement throughout the load space: front, rear, top, bottom, near the doors and near the refrigeration unit. The area immediately in front of the evaporator is the freezing risk in a chilled vehicle, exactly as in a cold room.
• Worst-case load, and the empty case too if the vehicle runs empty on return legs. An empty refrigerated body behaves very differently from a full one.
• Door openings matching the real delivery pattern, not one opening at the end.
• Loggers calibrated across the full transport range, including the ambient extremes the load space may reach — not just the target band.
• The output is a set of operating limits: maximum transit time, permitted ambient range, required conditioning, maximum door-open time per stop. Those limits then belong in the dispatch procedure, or the qualification has changed nothing.

Every shipment still carries a monitor. Qualification establishes that the equipment can hold the conditions; the logger establishes that it did on this occasion, and only one of those is evidence about the product in front of you.