When field assembly of pressure vessels or boilers is required, a copy of the completed U-1 Manufacturer's Data Report must be submitted to the code official.

• A. True
• B. False
• C. Depends on jurisdiction
• D. Not required

Answer: (A)

Documentation required by the authority having jurisdiction for field-assembled pressure vessels or boilers. The U-1 Manufacturer's Data Report is the essential document that records the vessel’s design, materials, fabrication details, welding information, nondestructive examination results, hydrostatic test data, and the maximum allowable working pressure. When field assembly is involved, the AHJ uses this report to verify that the equipment was manufactured in accordance with the ASME Code and that the field installation will meet the same safety and performance standards as a factory-assembled unit. Submitting a copy of the completed U-1 to the code official allows inspectors to check that the vessel is properly documented, labeled, and capable of safe operation before it is installed or put into service. Therefore, this requirement is correct and reflects the need for code compliance documentation in field-erected situations.