Factory Acceptance Test (FAT): why it is a critical step before delivery

A Factory Acceptance Test (FAT) is a mandatory quality control step that verifies, at the manufacturer’s facility, that equipment and systems meet all technical and project requirements before they are shipped. It is the final confirmation that the product is ready for shipment, installation and operation.

What a FAT confirms

Compliance with the technical specifications, the quality of manufacturing and workmanship, and readiness for installation without corrections on site. Non-conformities found before delivery are faster, simpler and cheaper to correct.

Why it matters

A FAT reduces risk before the equipment reaches site. It helps prevent:

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

What a FAT typically includes

For piping assemblies and welded components, every element is checked and approved under controlled factory conditions:

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

FAT as proof of quality

Each step is documented for full traceability. A FAT witnessed by authorised inspectors adds transparency and reliability. At ML Weld Engineering the FAT is a standard part of quality assurance, carried out with a clear focus on compliance, accuracy and readiness.