What is the suggested minimum number of UT examination points for a small vessel with slight deterioration?

The correct answer indicates that the suggested minimum number of ultrasonic testing (UT) examination points for a small vessel with slight deterioration is one on each head and one on each shell course. This recommendation aligns with the guidelines for ensuring a comprehensive evaluation of the vessel's condition.

In pressure vessel inspections, it is vital to assess critical areas where deterioration might occur, particularly at the heads (the end caps of the vessel) and the shell courses (the cylindrical sections of the vessel). By suggesting one examination point on each head, as well as one on each shell course, this option ensures coverage of both the top and bottom ends, as well as the sides of the vessel, where stress concentrations or flaws are more likely to develop.

This approach recognizes the structural integrity of the vessel and its potential weaknesses, providing a balanced analysis without over-complicating the process or unnecessarily increasing the examination points for a small vessel with only slight deterioration. It serves as a practical guideline that remains manageable while still adhering to safety and regulatory standards.