Repair and Alteration Standards 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 Standards flashcards as text
According to API 510, a weld overlay repair used to restore wall thickness must have a minimum deposited thickness that meets:
Answer: The minimum required wall thickness per the applicable code
Weld overlay (cladding) must restore the wall to at least the minimum required thickness calculated per the applicable construction code.
When an existing pressure vessel nozzle is being replaced, the replacement nozzle must conform to:
Answer: The original construction code or a later edition approved by the jurisdiction
Replacement nozzles must conform to the original construction code or a later code edition acceptable to the jurisdiction.
Which preheat practice is used to prevent hydrogen cracking in high-strength low-alloy (HSLA) steel repair welds?
Answer: Maintaining elevated preheat and interpass temperatures throughout welding
Maintaining proper preheat and interpass temperatures slows the cooling rate and allows hydrogen to diffuse out before cracking can occur.
In API 510, the term 'fitness-for-service' (FFS) evaluation is used to:
Answer: Assess whether a degraded vessel can continue to operate safely under defined conditions
A fitness-for-service evaluation assesses the structural integrity and remaining life of a vessel with degradation to determine if continued operation is safe.
When a pressure vessel shell is repaired by inserting a full-circumference insert plate, the longitudinal weld seams of the insert must be:
Answer: Offset from the original shell seams by a minimum distance specified in the code
Insert plate longitudinal seams must be offset from the original seams to avoid weld intersections that concentrate stress.
After completing welded repairs, what is the preferred method to verify the repair weld's integrity in a vessel that had active corrosion?
Answer: Hydrostatic test or pneumatic test per the applicable code
A pressure test (hydrostatic or pneumatic) is the preferred verification after welded repairs, confirming the repaired area can sustain the design conditions.
Which of the following welding processes is classified as a 'low-hydrogen' process and is preferred for repairing pressure vessel steels?
Answer: Submerged arc welding (SAW) and gas metal arc welding (GMAW)
SAW and GMAW are inherently low-hydrogen processes; when SMAW is used, low-hydrogen (EXX18) electrodes are required for pressure vessel repairs.