API 510 Repair, Alteration & Rerating Procedures 5

Question 1

API 510 states that the inspector should review which documents before approving a repair involving welding?

Accepted Answer

Welding procedure specifications (WPS), welder qualifications, and the repair plan

Answer

Before approving welded repairs, the inspector must review and verify the WPS, welder performance qualifications, and the overall repair plan.

Question 2

A steel pressure vessel shell has corroded to a thickness below the minimum required. The owner plans to restore it by welding a full encirclement sleeve. This is considered a:

Accepted Answer

Permanent repair if designed and executed to applicable code requirements

Answer

A properly designed and installed full encirclement sleeve welded per applicable code can be a permanent repair restoring pressure-containing integrity.

Question 3

Under API 510, when does a change in service fluid (e.g., from water to a lethal gas) require the vessel to be treated as an alteration?

Accepted Answer

When the new service results in more severe conditions not covered by the original design or code requirements

Answer

A service change is an alteration when the new conditions (pressure, temperature, corrosivity, or lethal service classification) exceed the original design intent.

Question 4

After completing an alteration, the 'R' stamp holder must update the nameplate to show:

Accepted Answer

The new MAWP, temperature, and the 'R' stamp number with the alteration year

Answer

Following an alteration, the nameplate must be updated to reflect the revised MAWP, temperature rating, and the R-stamp holder's mark with the year of alteration.

Question 5

When calculating the MAWP for rerating a vessel shell, the inspector uses the 'actual measured thickness' rather than the nominal thickness because:

Accepted Answer

Nominal thickness always overstates the actual metal available after corrosion and mill tolerance

Answer

After service, corrosion and mill under-tolerance reduce wall thickness below nominal, so the actual measured value provides a more accurate and conservative MAWP.

(API 510) API 510 Inspector Certification Practice Test

(API 510) API 510 Inspector Certification Practice Test

API 510 Repair, Alteration & Rerating Procedures 5