FAT Checks for a Wet High-Shear Mixer Granulator
Buyers should define measurable pass or fail checks for mixing, granulation, and control functions before signing off a wet high-shear mixer granulator at the factory.
A practical buyer decision is whether to accept the granulator on a witnessed run of a representative powder batch or on documentation alone. For a 100 L total bowl with 60 L working volume, ask the supplier to state the batch size and fill level used for the factory acceptance test, and confirm that the impeller speed range of 140–270 rpm is demonstrated across its span.
Build the acceptance test around observable checks: bowl and lid fit, seal integrity, impeller rotation direction, speed stability at set points, and interlock response when the lid is opened. For mixing, agree in advance how uniformity will be judged, such as sampling points and a visual or physical endpoint, rather than accepting a general statement. Ask whether the test material matches your powders and whether cleaning between runs is included.
Define fail criteria before the visit: any uncontrolled speed deviation, seal leakage, or safety interlock bypass is a fail. Record who witnesses each check and what evidence is retained.
Before requesting a quote, confirm with the supplier which checks they will perform at the factory, the test material and batch size, the instrumentation used, and what documentation and acceptance records will be provided.