What is a Factory Acceptance Test for industrial equipment?
Why must a FAT be defined in the contract?
A Factory Acceptance Test is not a generic checklist the supplier runs as a courtesy. It is a defined obligation in the purchase contract: an inspection and test plan agreed between buyer and supplier, naming the tests to be performed, the standards they will follow, the measurement criteria, the equipment to be used, and the witnessing arrangement. The FAT exists in the form the contract defines.
That contractual basis is what gives the FAT its weight. In many contracts, FAT acceptance is tied to a payment, shipment, or documentation milestone; failure gives the buyer specific rights (corrective action, re-test, deferred shipment) without renegotiation. A FAT not anchored in the contract has limited control value. A FAT anchored in the contract becomes one of the procurement’s important control points.
What does a FAT actually check?
A complete FAT verifies the equipment against four classes of contract content:
- The technical specification — dimensions, materials, components, configuration, labelling, and visual condition match the agreed specification.
- Performance requirements — measured performance (capacity, efficiency, accuracy, response, whatever the equipment’s output metric is) meets the contracted values under the test conditions defined.
- Certifications and compliance — certificates, type-test reports, and compliance documentation are present, authentic, and apply to the equipment being shipped.
- Documentation package — manuals, drawings, spare-parts lists, calibration certificates, and any project-specific documentation are complete and match the as-built equipment.
What types of tests can be included in a FAT?
The specific tests depend on the equipment and the applicable standard. Some common categories:
- Routine tests — required by the relevant standard for every unit produced (insulation resistance for transformers, hydrostatic test for pressure vessels, polarity and continuity for wiring assemblies).
- Type tests — performed once per design to validate the design itself (short-circuit tests for switchgear, temperature-rise tests for transformers). Often already done by the manufacturer with reports referenced rather than repeated for each contract.
- Performance tests — measured against the contract’s performance values (efficiency curves, throughput, accuracy under load).
- Functional tests — operational sequences, control system behaviour, interlocks, alarms, and emergency stops, run end-to-end.
- Visual and dimensional inspection — final check of fit, finish, labelling, marking, and packing.
Who should attend a FAT, and what are their roles?
A typical attended FAT involves the supplier’s testing team running the tests, the supplier’s QC representative confirming results against the procedure, the buyer or buyer’s representative observing and signing off, and — for lender- or end-client-monitored projects — a third-party inspector with authority to accept or refuse on behalf of the absent party. Each role is named in the inspection and test plan, and each signature on the FAT report carries a specific meaning.
How does FAT differ from the supplier’s internal QC?
Internal QC is the supplier’s own quality control during and after manufacturing. It is independent of the buyer’s presence, follows the supplier’s procedures, and produces internal records. FAT is the buyer-facing acceptance event that draws on the QC results but adds witnessed verification, contract-anchored test scope, and signed buyer acceptance. A supplier with strong internal QC will pass FAT easily; a supplier whose internal QC is weak will struggle.
How does FAT differ from SAT and commissioning?
FAT happens at the manufacturer’s premises before shipment. SAT — Site Acceptance Test — happens at the buyer’s installation site after delivery, verifying that the equipment performs under operating conditions and in its installed configuration. Commissioning is the broader handover phase that brings the equipment into operational service (including SAT, training, calibration of on-site references, and warranty start). FAT is the earliest of the three acceptance points; SAT and commissioning depend on the FAT having been done properly.
How Sinospect handles the FAT step
Sinospect handles FAT coordination in China end-to-end: review of the inspection and test plan against the contract, on-site attendance at the manufacturer’s premises, witnessed sign-off, and delivery of the documented FAT package back to the buyer. The work is embedded in the wider procurement execution rather than run as a one-off transactional service.
See the cluster guide on factory acceptance testing for the broader workflow, or how Sinospect works for the full execution method.
Frequently asked questions
Is the term FAT standardised in international procurement?
FAT is a widely used industry term rather than a single standardised procedure. The principle (witnessed acceptance testing at the manufacturer’s premises) appears in many standards and codes — IEC for electrical equipment, ASME for pressure vessels, API for oil-and-gas equipment, IEEE for some power equipment — each defining the specific tests that apply to its product category. The contract names the standard the FAT will follow.
Can a fully remote FAT be considered equivalent to an attended one?
For lower-stakes equipment with strong supplier track record and a competent third-party witness, a remote FAT (live video, full documentation, recorded testing) can be sufficient. For high-value, custom, or lender-financed equipment, an attended FAT — in person or via a delegated third-party inspector physically present — is typically required.
How long does a FAT take?
From half a day for a small piece of standard equipment to a full week for a large bespoke installation. The duration is driven by the test scope agreed in the inspection and test plan, not by a standard convention. A poorly-planned FAT often runs over its allotted time because non-conformities surface during testing and need on-the-spot resolution.
What happens to the FAT documentation after the test?
The signed FAT report, test records, calibration certificates, photographs, and corrective-action register are incorporated into the equipment’s lifecycle documentation: the as-built dossier handed to the end client, the installation and commissioning reference, the warranty baseline, and — for lender-financed projects — the disbursement support package.