Factory Acceptance Test (FAT): Why It Is a Critical Step Before Delivery

About the Factory Acceptance Test

Factory Acceptance Test (FAT) is a mandatory quality control step that verifies whether equipment and systems meet all technical and project requirements before they leave the factory.

FAT is performed at the manufacturer’s facility and serves as a final confirmation that the product is ready for shipment, installation and operation.

What Is Factory Acceptance Test (FAT)?

Factory Acceptance Test (FAT) is a structured inspection process used to confirm:

• compliance with technical specifications
• quality of manufacturing and workmanship
• readiness for installation without on-site corrections

By conducting FAT testing before delivery, potential non-conformities are identified early, when corrective actions are faster, simpler and more cost-efficient.

Why FAT Is Important

The main purpose of Factory Acceptance Test is to reduce risk before equipment reaches the site. FAT helps prevent:

• installation delays
• unexpected modifications on site
• additional costs caused by rework
• quality disputes after delivery

For complex systems such as piping assemblies and welded components, FAT ensures that all elements are checked and approved under controlled factory conditions.

What Does FAT Typically Include?

A standard Factory Acceptance Test usually consists of:

• Visual inspection of materials, welds, markings and overall workmanship
• Dimensional verification of pipe lengths, diameters, wall thicknesses and alignment
• Weld inspection, including verification of WPS and welder qualifications

Each step is documented to provide full traceability and compliance confirmation.

FAT as Proof of Quality

Factory Acceptance Test provides documented evidence that the product meets contractual and technical requirements prior to shipment. When FAT is witnessed by authorized inspectors, it adds an additional level of transparency and reliability.

FAT at ML Weld Engineering

At ML Weld Engineering, Factory Acceptance Test is a standard part of our quality assurance process. Every FAT is conducted with a clear focus on compliance, accuracy and readiness, ensuring that delivered systems meet the highest quality expectations from day one.