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API-571 – Corrosion and Materials

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Showing 13–15 of 20 questions

Question 13

NAC may be found in hot hydrocarbon streams downstream of the crude and vacuum units, __________ any hydrogen mix point.

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  • ○

    Upstream of
  • ○

    Downstream of
  • ○

    Adjacent to
  • ○

    Around
Question 14

Cracking can occur at low caustic levels if a concentrating mechanism is present. In such cases, caustic concentrations of ________ ppm are sufficient to cause cracking.

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  • ○

    50-100
  • ○

    100-150
  • ○

    150-200
  • ○

    200-250
Question 15

Hardness levels above ________ are highly susceptible to hydrogen stress cracking (HF).Time-to-failure decreases as the hardness increases.

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  • ○

    225 BHN
  • ○

    237 BHN
  • ○

    241 BHN
  • ○

    247 BHN