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Corrosion 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 Corrosion Assessment flashcards as text

  1. What is the primary driving factor for stress corrosion cracking (SCC) to occur?

    Answer: Tensile stress, susceptible material, and corrosive environment simultaneously

    SCC requires all three conditions to be present: a susceptible material, tensile stress, and a specific corrosive environment.

  2. A vessel shell has a measured thickness of 0.320 inches and a required minimum thickness of 0.285 inches. What is the corrosion allowance remaining?

    Answer: 0.035 inches

    Remaining corrosion allowance = measured thickness minus required minimum = 0.320 minus 0.285 = 0.035 inches.

  3. Hydrogen-induced cracking (HIC) in pressure vessels is most commonly associated with which process environment?

    Answer: Wet hydrogen sulfide (H2S) service

    HIC is strongly associated with wet H2S environments where atomic hydrogen is generated and diffuses into the steel.

  4. When calculating remaining life using API 510, which formula is correct?

    Answer: RL = (t_actual minus t_min) divided by corrosion rate

    Remaining life = (actual thickness minus minimum required thickness) divided by the corrosion rate in thickness per year.

  5. Crevice corrosion is most likely to initiate in which location on a pressure vessel?

    Answer: Tight gaps under gaskets or lap joints

    Crevice corrosion initiates in occluded, low-oxygen areas such as under gaskets, lap joints, or threaded connections where stagnant electrolyte concentrates.

  6. Which inspection technique is MOST effective for detecting and sizing pitting corrosion on a vessel shell?

    Answer: Ultrasonic thickness scanning (C-scan)

    Ultrasonic C-scan mapping provides area coverage to detect, size, and map pitting patterns on vessel shells.

  7. In API 510, what is the typical next inspection interval limit for a pressure vessel in normal service based on remaining life?

    Answer: No more than one-half of the remaining life, not to exceed 10 years

    API 510 limits the next inspection interval to no more than half the calculated remaining life and not to exceed 10 years for internal inspections.