The ASME code symbol stamp 'U' indicates which of the following?

The ASME code symbol stamp 'U' indicates which of the following?

• A. Pressure vessel constructed per ASME VIII Div. 1
• B. Piping system compatibility with temperature
• C. Weld quality assurance requirements
• D. Nondestructive testing methods

Answer: (A)

The U stamp on a pressure vessel signals that it was manufactured under the ASME Boiler and Pressure Vessel Code for unfired pressure vessels, specifically conforming to Section VIII, Division 1. It shows that the vessel’s design, materials, fabrication, testing, and inspection meet the code’s requirements, and that an Authorized Inspector has reviewed and approved the vessel’s compliance through the code-mandated quality controls and documentation. This stamp is not about piping system temperature compatibility, nor is it a direct indication of any particular nondestructive testing method or weld QA in isolation. Those aspects are part of the overall code compliance evaluated for the U stamp, but the stamp itself identifies that the vessel as a whole meets the code for unfired pressure vessels.

The U stamp on a pressure vessel signals that it was manufactured under the ASME Boiler and Pressure Vessel Code for unfired pressure vessels, specifically conforming to Section VIII, Division 1. It shows that the vessel’s design, materials, fabrication, testing, and inspection meet the code’s requirements, and that an Authorized Inspector has reviewed and approved the vessel’s compliance through the code-mandated quality controls and documentation.

This stamp is not about piping system temperature compatibility, nor is it a direct indication of any particular nondestructive testing method or weld QA in isolation. Those aspects are part of the overall code compliance evaluated for the U stamp, but the stamp itself identifies that the vessel as a whole meets the code for unfired pressure vessels.