An auditor stacks three delivery notes side by side and asks a single question: these three shipments went out under three different plates, so whose qualification file am I looking at? The question sounds routine, yet the whole mechanics of the rent-or-buy decision sits behind it, because in temperature-controlled distribution the qualification file belongs to the equipment, and when the equipment changes the file changes with it.
In Turkey the ground for that question is section 4.3.2 of the TİTCK Good Distribution Practice guideline for medicinal products for human use. It asks that the scope and purpose of equipment qualification and process validation be set by a documented risk assessment, that equipment and processes be validated before they are brought into use and after every significant change such as repair or maintenance, and that the resulting report be approved by the responsible manager. The auditor asking about plates is quoting his own guideline.
A vehicle's calendar runs across two seasons. How a vehicle gets qualified is written out in WHO TRS 992, Annex 5, Supplement 11, clause 2.3.4. The clause calls for four tests: maximum load and minimum load in the hottest season of the year, then maximum and minimum load again in the coldest one. The note to that clause adds that once the first two tests are done the vehicle counts as conditionally qualified only, and that a qualification valid all year cannot be closed out before the second season is complete. Whatever distance your calendar puts between the hottest and the coldest period is the length of the exercise, which in practice lands around half a year.
A container's calendar is built on repeats
For a passive container the clock works differently. Clauses 2.1.2 and 2.1.3 of Supplement 13 to the same annex split the work into DQ, OQ and PQ, and ask for OQ and PQ to be run three times each. Clause 2.4 then wants minimum load and maximum load tested separately, with the series repeated in the hottest and the coldest part of the year. For a single container type, the example plan in Table 1 of that supplement reaches at least 12 tests once two loading configurations and two temperature profiles are counted in.
| Stage | What Supplement 13 asks for | Runs |
|---|---|---|
| DQ | design qualified against the specification | - |
| OQ | minimum and maximum load tested separately | 3 |
| PQ | verification under real shipping conditions | 3 |
The triple repeat also explains the part of the plan people skip over: the figure of 12 comes from multiplying one container type by two loading configurations and two temperature profiles. Add one more profile to your product range, or start running the same container with a different internal layout, and the plan grows by exactly that multiplier. What inflates the test count is the number of ways you use the container, while the container itself stays as it was.
With multi-use containers the work does not end with the first series, though it stays predictable. Clause 2.1.4 of the same supplement asks for multi-use containers to be requalified periodically, typically once a year, where a risk assessment points to it, or whenever there is a significant change in transport operations. That is a line you can write into a maintenance plan and budget a year ahead.
The decision sits between the two calendars
From here on we are setting out our own reading. If 4.3.2 wants validation before equipment is brought into use and after every significant change, then a rented reefer that turns up at your dock under a new plate each time is, to an auditor's eye, new equipment each time, and its file opens again. A container you own is qualified once, refreshed yearly under clause 2.1.4, and carries the same file whichever truck body it travels in.
Put that calendar next to the cost sheet and the question of renting or buying a refrigerated vehicle gets answered from a different direction.
Framed that way, a new line appears in the cost sheet: with a rented vehicle, qualification costs you as many times as it repeats over the life of the contract, while with your own containers it is one setup plus an annual repeat. If your growth is short and irregular, accepting the repeated calendar and renting stays a sound call; once the shipment pattern has settled, building the qualification file on equipment you own simplifies both the audit and the planning over the years.
