Industrial production processes, equipment and scale-up
Scope
This domain tests scale-up from kitchen batch to industrial line: equipment selection, heat and mass transfer, mixing, hygiene, automation and the changes that appear when a 20 L recipe becomes 2,000 L.
Core rules
- Batch, semi-continuous and continuous processes have different labour, flexibility and changeover costs.
- Heat penetration is diffusion-limited. As batch size rises, surface-to-volume ratio falls, so come-up and cooling times increase non-linearly.
- Equipment must be hygienically designed: stainless steel, smooth welds, drainability, accessible for cleaning, CIP compatible.
- Shear from pumps, homogenisers and fillers can alter sauces, emulsions and foams.
- Scale-up must revalidate critical limits, not just multiply ingredients.
Worked example
A 20 L soup base is heated in a jacketed kettle in 15 minutes. Scale to 2,000 L. Ingredients scale 100×, but heating time does not. The larger vessel has less surface area per litre, so the same steam jacket may need 60–90 minutes and the cold point may be near the centre. Fit a validated temperature probe, establish a new come-up curve, and confirm the hold time at 90 °C before filling.
Traps
- Scaling processing time by the same factor as ingredients.
- Assuming a larger mixer gives the same dispersion.
- Ignoring dead legs and valves in cleaning validation.
- Changing equipment without revalidating CCPs.