Repair and Alteration Flashcards
7 cards from real API 510 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Repair and Alteration flashcards as text
When performing a weld overlay repair on a corroded vessel shell, the minimum thickness after repair must meet:
Answer: The required minimum thickness per applicable code
Post-repair thickness must meet or exceed the calculated minimum required thickness per the applicable code, not necessarily the original nominal thickness.
Under API 510, a pressure vessel alteration that increases the maximum allowable working pressure (MAWP) must be reviewed by:
Answer: A pressure vessel engineer with expertise in vessel design
Alterations that affect the MAWP require engineering review by a qualified pressure vessel engineer to ensure the vessel can safely handle the new conditions.
Hot tapping on a pressure vessel in service is considered:
Answer: An alteration requiring engineering review and inspector approval
Hot tapping is an alteration that requires engineering review for integrity and must be approved by the authorized inspector before proceeding.
When is a pressure test required after completing a repair on a pressure vessel?
Answer: When the repair involves welding that penetrates the pressure boundary
API 510 requires a pressure test after repairs that penetrate the pressure boundary to verify the integrity of the weld repair.
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?
Answer: 1/2 inch (13 mm)
ASME Section VIII Div. 1 requires PWHT for P-1 carbon steel welds exceeding 1/2 inch (13 mm) thickness under most conditions.
An insert plate repair used to replace a corroded section of a vessel shell must have:
Answer: Full penetration welds on all seams connecting it to the shell
Insert plate repairs must use full penetration welds on all connecting seams to maintain full shell integrity equivalent to original construction.
When a repair is made on a vessel without performing the normally required post-weld heat treatment, which alternative method is acceptable per API 510?
Answer: Using a temper bead welding technique with appropriate documentation
The temper bead welding technique can substitute for PWHT in specific cases when approved by the authorized inspector and engineering review.