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API API-571 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Terms, Definitions, and Acronyms: This domain covers the key terminology, standard definitions, and commonly used acronyms related to corrosion and materials. It ensures a clear understanding of technical language used throughout the API-571 body of knowledge.
Topic 2
  • Damage Mechanisms: This domain explains various corrosion and damage mechanisms, including their characteristics, affected materials, causes, and visual appearance. It also covers where damage occurs, along with methods for prevention, mitigation, inspection, and monitoring.

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API Corrosion and Materials Professional Sample Questions (Q108-Q113):

NEW QUESTION # 108
Hydrogen permeation or diffusion rates associated with wet H#S damage of carbon steel and low-alloy steels have been found to be minimal at a pH of:

Answer: B

Explanation:
API RP 571 discusses this under Wet H#S Damage - Hydrogen Blistering, HIC, SOHIC:
"Hydrogen generation is reduced as pH increases. At pH 9 and above, the corrosion potential is less favorable for hydrogen charging and thus permeation into the steel is minimal."
"Most wet H#S cracking damage mechanisms are accelerated under acidic conditions (pH < 7)." Hence, high pH (around 9) environments offer the most protection against hydrogen damage, making option D the correct choice.


NEW QUESTION # 109
________ is a form of carbon that may promote carburization, particularly during decoke cycles where temperatures exceed the normal operating temperatures.

Answer: D


NEW QUESTION # 110
The rate of creep deformation is a function of the material, load and temperature. The rate of damage is sensitive to both load and temperature. Generally, an increase of about _______ or an increase of ________ on stress can cut the remaining life in half.

Answer: C


NEW QUESTION # 111
Which of the following is a critical factor for chloride stress corrosion cracking?

Answer: B

Explanation:
According to API RP 571, in the section on "Chloride Stress Corrosion Cracking (Cl-SCC)", several critical factors are outlined that contribute to the initiation and propagation of this mechanism. The document states:
"Critical factors include the presence of chlorides (even at ppm levels), oxygen, elevated temperatures, tensile stress, and susceptible materials such as austenitic stainless steels and some nickel alloys."
"Oxygen is an accelerant and promotes pitting that can lead to SCC initiation." (Reference: API RP 571, 3rd Edition, Section 4.2.2.2) Therefore, the presence of oxygen is a well-documented critical factor in Cl-SCC. It acts in conjunction with chlorides to initiate localized pitting, which then progresses into cracking. Hence, option B is the correct choice.


NEW QUESTION # 112
The presence of ________ in H²S streams increases the severity of high temperature sulfide corrosion at temperatures above about 500º F

Answer: A


NEW QUESTION # 113
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