API 510 Repair and Alteration Standards 2

Question 1

According to API 510, who must authorize a repair to a pressure vessel before work begins?

Accepted Answer

The vessel owner/user

Answer

API 510 requires the owner/user to authorize repairs before the repair organization begins work.

Question 2

When welding repairs are made to a vessel that was originally post-weld heat treated (PWHT), what is generally required?

Accepted Answer

PWHT of the repaired area

Answer

When the original fabrication required PWHT, repairs involving welding typically require PWHT of the repaired area unless an exemption applies.

Question 3

A 'temper bead' welding technique is primarily used to:

Accepted Answer

Eliminate the need for PWHT by refining the heat-affected zone grain structure

Answer

Temper bead welding uses successive weld beads to refine and temper the HAZ, allowing PWHT to be waived under specific conditions.

Question 4

Under API 510, an alteration to a pressure vessel requires a new calculation or re-rating if:

Accepted Answer

The change affects the vessel's pressure-containing capability or rated capacity

Answer

Alterations that affect the pressure-containing capability require engineering calculations and possible re-rating.

Question 5

Which document must be completed and retained for alterations performed under the National Board Inspection Code (NBIC)?

Accepted Answer

NB-3 form (Alteration Report)

Answer

The NB-3 form (Alteration Report) is required by the NBIC for alterations to pressure vessels.

(API 510) Certified Pressure Vessel Inspector Practice Test