API 510 Repair, Alteration & Rerating Procedures 4

Question 1

According to API 510, weld overlay (cladding restoration) on a corroded vessel shell is classified as a:

Accepted Answer

Repair requiring WPS qualification and authorized inspector involvement

Answer

Weld overlay to restore corroded pressure-containing areas is a repair that requires qualified welding procedures and authorized inspector oversight.

Question 2

A pressure vessel owner wants to lower the MAWP of a vessel (rerate downward). Under API 510, this:

Accepted Answer

Is generally straightforward and requires updating the nameplate and records

Answer

Rerating to a lower MAWP is generally a simpler process but still requires updated documentation, nameplate changes, and notification to the inspector.

Question 3

When a repair is made by welding on a vessel in hydrogen service, which additional concern must be addressed?

Accepted Answer

Hydrogen embrittlement risk and the need for bake-out procedures before welding

Answer

Vessels in hydrogen service risk hydrogen-induced cracking; bake-out (degassing) before welding and careful preheat/PWHT practices are essential.

Question 4

Under API 510, which document establishes the minimum requirements for repair organizations performing welded repairs on pressure vessels?

Accepted Answer

The National Board Inspection Code (NBIC)

Answer

The NBIC (National Board Inspection Code) establishes the minimum requirements for repair organizations, including those holding the National Board 'R' stamp.

Question 5

After a repair, the inspector records the work on which form when using the National Board program?

Accepted Answer

NB Form R-1 (Report of Repair)

Answer

National Board Form R-1 is the official repair report that must be completed and filed for pressure vessel repairs under the R-stamp program.

(API 510) API 510 Inspector Certification Practice Test

(API 510) API 510 Inspector Certification Practice Test

API 510 Repair, Alteration & Rerating Procedures 4