What does a vessel stamped with 'U' indicate?

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Multiple Choice

What does a vessel stamped with 'U' indicate?

Explanation:
The U stamp signals certification under the ASME Boiler and Pressure Vessel Code for unfired pressure vessels, specifically indicating construction in accordance with ASME Section VIII, Division 1. This mark is applied after design, fabrication, inspection, and hydrostatic testing meet the Code’s requirements and are witnessed by an Authorized Inspector. API 620 is a separate standard for large welded low‑pressure tanks and does not provide the U stamping. Similarly, Section IX covers welding qualifications and B31.3 covers piping; neither is a stamp for the finished vessel. So a vessel bearing the U mark denotes compliance with ASME VIII, Division 1.

The U stamp signals certification under the ASME Boiler and Pressure Vessel Code for unfired pressure vessels, specifically indicating construction in accordance with ASME Section VIII, Division 1. This mark is applied after design, fabrication, inspection, and hydrostatic testing meet the Code’s requirements and are witnessed by an Authorized Inspector. API 620 is a separate standard for large welded low‑pressure tanks and does not provide the U stamping. Similarly, Section IX covers welding qualifications and B31.3 covers piping; neither is a stamp for the finished vessel. So a vessel bearing the U mark denotes compliance with ASME VIII, Division 1.

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