API 510 Repair and Alteration 3

Question 1

When performing a weld overlay repair on a corroded vessel shell, the minimum thickness after repair must meet:

Accepted Answer

The required minimum thickness per applicable code

Answer

Post-repair thickness must meet or exceed the calculated minimum required thickness per the applicable code, not necessarily the original nominal thickness.

Question 2

Under API 510, a pressure vessel alteration that increases the maximum allowable working pressure (MAWP) must be reviewed by:

Accepted Answer

A pressure vessel engineer with expertise in vessel design

Answer

Alterations that affect the MAWP require engineering review by a qualified pressure vessel engineer to ensure the vessel can safely handle the new conditions.

Question 3

Hot tapping on a pressure vessel in service is considered:

Accepted Answer

An alteration requiring engineering review and inspector approval

Answer

Hot tapping is an alteration that requires engineering review for integrity and must be approved by the authorized inspector before proceeding.

Question 4

When is a pressure test required after completing a repair on a pressure vessel?

Accepted Answer

When the repair involves welding that penetrates the pressure boundary

Answer

API 510 requires a pressure test after repairs that penetrate the pressure boundary to verify the integrity of the weld repair.

Question 5

A vessel with a P-1 carbon steel shell requires PWHT after repair welding when the repair weld exceeds which thickness threshold per ASME Section VIII Div. 1?

Accepted Answer

1/2 inch (13 mm)

Answer

ASME Section VIII Div. 1 requires PWHT for P-1 carbon steel welds exceeding 1/2 inch (13 mm) thickness under most conditions.

(API 510) API 510 Inspector Certification Practice Test

(API 510) API 510 Inspector Certification Practice Test

API 510 Repair and Alteration 3