Question 1
At what Total Acid Number (TAN) does naphthenic acid corrosion typically become a significant concern in crude oil processing?
Correct Answer:
0.5 mg KOH/g
Question 2
What temperature range is associated with the highest naphthenic acid corrosion rates in refinery distillation equipment?
Correct Answer:
450°F–750°F (232°C–399°C)
Question 3
Which alloying element in stainless steel provides the greatest improvement in resistance to naphthenic acid corrosion?
Correct Answer:
Molybdenum
Question 4
What is the primary corrosion mechanism in refinery amine treating units that causes attack on carbon steel equipment?
Correct Answer:
Acidic conditions from absorbed CO2 and H2S at elevated temperatures
Question 5
Carbon steel welds in amine service are susceptible to amine stress corrosion cracking when hardness exceeds which threshold?
Correct Answer:
HRC 22 (235 HB)
Question 1
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About this Exam

Prepare with the API 571 Corrosion and Materials practice quiz. This question bank includes 86 questions covering corrosion, steel, carbon, equipment, and temperature. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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API 571 Corrosion and Materials

This practice set contains 86 questions from the matching question bank and focuses on corrosion, steel, carbon, equipment, and temperature. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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