FAT and SAT is a big part of project execution and installation. Many projects require a Factory Acceptance Test before going on site. This testing period involves How to the specified design has been properly implemented in the software. Input are simulated to test the operation of the software. also software documents have kept up to date these same documents and that documents can be used to verify the operations of the software.

Factory Acceptance Test (FAT)

The main objective of the FAT is to test the instrumented safety system (logic solver and associated software). The tests are normally carried out during the final part of the design and engineering phase before the final installation in the plant. The FAT is a customized procedure to verify the instrumented safety system and the instrumented safety functions according to the specification of safety requirements.

The FAT includes appropriate general test procedures for the verification of the proper functioning of the safety instrumented system. Since test activities are general methods, the FAT is applied to programmable or non-programmable safety instrumented systems. The most important part of the FAT addresses the specification of test cases, that is, a clear description of test cases, well-structured test procedures and relevant test cases.


It is important to note here that there are different levels of a FAT. They can be done at a very basic level, such as configuring the main parts of the system with temporary wiring and making sure that everything moves as it is supposed to, or a more complete FAT can be carried out where the manufacturer physically constructs the entire system in your store to test it completely. In the last example, the system is dismantled, moved to the client’s site and reassembled

For example if we start pump from field so actually that indication show in the scada. In shorts the software should then behave as per documentation. verification logic for testing that pumps start and stop and pump run status also. through simulation and then not turning them on to verify that the check logic is functioning correctly.

There are changes identified during the FAT. These changes should be done before going commissioning or installation. The contractor will have only small changes to make in the software documentation rather than a time consuming effort at the end of the project

Best advantage of FAT is another milestone in the project as the software has been proven in design. The next step is to place SCADA software or equipment in the field and Verify everything again using the real world inputs and outputs

Benefits of the factory acceptance test

Ø  Clients can “touch
and feel” the equipment while in operational mode before sending it.

Ø  The manufacturer
can provide some initial customer training, which gives operations personnel
more confidence when using the machinery for the first time in real

Ø  The key people of
the project from both sides are together, which makes it the ideal time to
review the list of materials, analyze the necessary and recommended parts (for
the start-up and the first year of operation) and review the procedures for
maintenance and equipment limitations.

Ø  The comprehensive
FAT documentation can be used as a template for the Validated installation /
installation installation qualification part.

Ø  Based on the
results of the FAT, both parties can create a list of additional elements that
must be addressed before shipment


Commissioning and Site Acceptance Testing