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
Under API 510, an authorized inspector must be present to witness which activity during a vessel repair?
Answer: Final closure welds on the pressure boundary
The authorized inspector must witness critical repair steps including final closure welds to verify compliance with the approved repair procedure.
A vessel that requires repair due to fire damage must first be evaluated for:
Answer: Metallurgical changes caused by the elevated temperatures before repair welding begins
Fire damage can cause metallurgical degradation, sensitization, or loss of heat treatment in the vessel material, which must be evaluated before any repair welding.
Which of the following best describes an acceptable alternative to a hydrostatic test after a pressure vessel repair?
Answer: A pneumatic test at a reduced pressure with appropriate safety precautions
A pneumatic test can substitute for a hydrostatic test when it is impractical to fill the vessel with water, provided appropriate safety precautions are taken per the applicable code.
When a repair involves replacing a section of vessel shell with new material, the replacement material must be:
Answer: Of equal or superior specification to the original material per the applicable code
Replacement materials must meet or exceed the specification of the original material to ensure equivalent pressure-containing capability.
Under API 510, which of the following conditions would NOT typically classify as an alteration?
Answer: Replacing a corroded nozzle with an identical nozzle of the same size and material
Replacing a nozzle with an identical replacement (same size, material, and rating) is classified as a repair, not an alteration, since no design change is made.
After completing a repair weld on an in-service pressure vessel, which NDE method is most commonly specified to verify full fusion and detect internal defects?
Answer: Radiographic testing (RT) or ultrasonic testing (UT)
RT or UT are volumetric NDE methods capable of detecting internal weld defects such as lack of fusion, porosity, and cracks within the repair weld.
A pressure vessel repair that uses a different material than the original construction requires which additional step beyond standard repair procedures?
Answer: Engineering review to confirm compatibility including weldability and corrosion resistance
Material substitutions require engineering review to confirm that the alternative material is compatible with the original design, service environment, and welding requirements.