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API API-571 Exam Syllabus Topics:

SectionObjectives
Metallurgical Damage Mechanisms- Embrittlement phenomena
  • 1. Sigma phase embrittlement
    • 2. Temper embrittlement
      - High-temperature degradation
      • 1. Thermal fatigue
        • 2. Graphitization
          • 3. Creep damage
            Environmentally Assisted Cracking- Stress corrosion cracking
            • 1. Caustic cracking
              • 2. Chloride stress corrosion cracking
                - Hydrogen-related damage
                • 1. Hydrogen embrittlement
                  • 2. Hydrogen induced cracking (HIC)
                    • 3. Hydrogen blistering
                      Refining Process-Specific Damage- FCC and sulfur recovery units
                      • 1. High-temperature sulfidic corrosion
                        • 2. Erosion-corrosion interactions
                          - Hydroprocessing units
                          • 1. Hydrogen attack mechanisms
                            • 2. High-pressure hydrogen service degradation
                              General Knowledge of Damage Mechanisms- Overview of degradation in refining environments
                              • 1. Materials performance fundamentals
                                • 2. Damage mechanism classification
                                  Corrosion Mechanisms- Aqueous corrosion
                                  • 1. Crevice corrosion
                                    • 2. Microbiologically influenced corrosion (MIC)
                                      • 3. Galvanic corrosion
                                        • 4. Pitting corrosion
                                          • 5. Uniform corrosion
                                            - High-temperature corrosion
                                            • 1. Carburization
                                              • 2. Oxidation
                                                • 3. Sulfidation
                                                  Materials Selection and Mitigation- Corrosion control strategies
                                                  • 1. Coatings and linings
                                                    • 2. Corrosion inhibitors
                                                      • 3. Material selection principles

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                                                        API Corrosion and Materials Professional Sample Questions (Q126-Q131):

                                                        NEW QUESTION # 126
                                                        Amine cracking has been reported down to ambient temperatures with some amines. __________ temperatures and stress levels _______ the likelihood and severity of cracking.

                                                        Answer: B


                                                        NEW QUESTION # 127
                                                        (Deaerators that have not been postweld heat-treated are commonly subject to:)

                                                        Answer: B

                                                        Explanation:
                                                        Comprehensive and Detailed Explanation From Exact Extract:
                                                        Per API RP 571, deaerators often operate in environments where concentrated caustic solutions can form locally due to oxygen scavengers and water chemistry control additives.
                                                        When postweld heat treatment (PWHT) is not performed:
                                                        * High residual welding stresses remain
                                                        * Conditions are ideal for caustic stress corrosion cracking (Caustic SCC) API RP 571 identifies deaerators as classic examples of equipment that has experienced caustic SCC when PWHT was omitted.
                                                        Referenced Documents (Study Basis):
                                                        * API RP 571 - Section on Caustic Stress Corrosion Cracking


                                                        NEW QUESTION # 128
                                                        There is currently no known metal alloy that is immune to _________ under all conditions.

                                                        Answer: A


                                                        NEW QUESTION # 129
                                                        High temperature hydrogen attack results from exposure to hydrogen at elevated temperatures and pressures. The hydrogen reacts with __________ in steel to produce _________, which cannot diffuse through the steel. The loss of carbides causes an overall loss in strength.

                                                        Answer: B


                                                        NEW QUESTION # 130
                                                        Naphthenic acid corrosion (NAC) is most severe in what phase of flow?

                                                        Answer: B

                                                        Explanation:
                                                        API RP 571 on Naphthenic Acid Corrosion (NAC) details:
                                                        "NAC is most aggressive in two-phase flow where the shear stress is high, such as in elbows, reducers, and at orifices."
                                                        "High velocity and turbulence in two-phase flow strip protective layers and accelerate corrosion." Therefore, option A is the correct and most critical phase.


                                                        NEW QUESTION # 131
                                                        ......

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