Difference Between FAT and SAT
FAT and SAT are two types of testing that are frequently utilized in industrial, manufacturing, & engineering projects, notably for equipment & control systems.
Factory Acceptance Test (FAT)
Testing is performed at the manufacturer’s (or) supplier’s facility before the equipment is supplied to the client.
Purpose:
Prior to delivery, ensure that the equipment/system meets design standards and performs properly. Catch faults early to save costly on-site repairs.
Includes:
- Functionality tests.
- Control system logic verification
- Simulated inputs and outputs.
- Documentation review
Performed By:
Vendor/manufacturer, with (or) without the consumer present.
Site Acceptance Test (SAT)
Testing is performed at the final installation site, once the system has been delivered & installed.
Purpose:
Ensure system functionality in real-world operations. Confirm the integration with other systems.
Includes:
- Re-testing of functions examined during FAT.
- Power-up and I/O checks.
- Integration with external systems.
- Environmental performance (temperature, humidity, network)
Performed By:
Customer or end-user, typically with vendor assistance.
If you’re managing a project that includes both, the typical approach is:
FAT Shipment→Installation→SAT →Commissioning