When procuring new machinery—whether refrigeration compressors, heat exchangers, or complete production lines—factory acceptance testing (FAT) serves as the critical quality gate before equipment leaves the manufacturer's facility. FAT is a systematic verification process that confirms equipment meets all specified requirements, functions correctly, and complies with relevant codes and standards [1].
The traditional FAT process follows three core phases: planning (defining test protocols and acceptance criteria), documentation (recording all test results and deviations), and testing (executing visual inspections and functional performance tests). For B2B buyers on Alibaba.com, understanding this framework helps structure meaningful video inspection requests and evaluate supplier responses professionally.
FAT vs. SAT: Understanding the Difference
| Aspect | Factory Acceptance Test (FAT) | Site Acceptance Test (SAT) |
|---|---|---|
| Location | At manufacturer's facility before shipment | At buyer's facility after installation |
| Timing | Before equipment leaves factory | After equipment is installed on-site |
| Purpose | Verify construction, specifications, and basic functionality | Verify proper installation and integration with existing systems |
| Responsibility | Manufacturer leads, buyer witnesses (remotely or in-person) | Buyer leads, manufacturer supports |
| Cost | Typically included in equipment price | May incur additional travel and support costs |
| Risk Mitigation | Catches defects before shipping costs incurred | Catches installation or transit damage issues |

