Fitness-for-Service Assessment 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 Fitness-for-Service Assessment flashcards as text
In API 579, what type of damage mechanism is addressed in Part 9 of the FFS standard?
Answer: Creep damage
API 579-1/ASME FFS-1 Part 9 covers the assessment of components operating in the creep regime.
When an FFS assessment concludes that a vessel is fit for service but with a reduced MAWP, what action must the inspector ensure is taken?
Answer: Update the nameplate and documentation to reflect the new MAWP
When operating at a reduced MAWP, the vessel documentation, pressure relief device settings, and operating procedures must all be updated to reflect the new limit.
Which of the following best describes 'hydrogen blistering' in pressure vessel FFS assessments?
Answer: Internal delamination caused by hydrogen atoms combining to form H2 gas in voids
Hydrogen blistering occurs when atomic hydrogen diffuses into the steel and combines at internal defects to form molecular hydrogen gas, creating internal pressure that causes blister formation.
What is the role of a 'Remaining Life Assessment' (RLA) in the context of API 510 FFS evaluations?
Answer: Estimate how long the vessel can continue operating safely before requiring repair or retirement
An RLA estimates the time the vessel can safely continue in service based on current condition, damage rates, and minimum acceptable thickness.
Under API 579, when evaluating crack-like flaws, what two material properties are most critical for fracture mechanics assessment?
Answer: Yield strength and fracture toughness (KIC)
Fracture mechanics assessments for crack-like flaws primarily require yield strength and fracture toughness (KIC or equivalent) to determine critical flaw sizes.
A vessel subject to cyclic loading is being evaluated for fatigue damage under API 579 Part 14. What is the primary output of this assessment?
Answer: The cumulative fatigue damage ratio (D)
Fatigue assessment per API 579 Part 14 calculates the cumulative damage ratio D, where D ≥ 1.0 indicates fatigue life exhaustion.
In API 579 FFS assessments, what does the term 'reference stress' (σref) represent?
Answer: A representative stress used to characterize plastic collapse load
Reference stress is a stress parameter used in limit load and fracture mechanics analyses to characterize the proximity to plastic collapse of a flawed component.