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Category Breakdown Category Number of Questions Aqueous Corrosion 6 Other Damage Mechanisms 1 Environmental-Assisted Cracking 1 High-Temperature Corrosion 2 TOTAL 10 Question #:1 - [Aqueous Corrosion] Severe internal grooving corrosion is found at the bottom of a 4-inch (101.6 mm) carbon steel piping system in steam condensate service. Which of the following is the most likely cause? Carbon dioxide corrosion Carbonate corrosion Ammonium bisulfide corrosion Erosion-corrosion Answer: A Explanation API RP 571 explains under : Condensate Corrosion (CO# Corrosion) “In condensate systems, , which leads to carbon dioxide dissolves in the water forming carbonic acid localized corrosion, including , especially at low points like the bottom of grooving and under-deposit attack horizontal piping.” “This is most commonly observed in , and the damage is steam condensate return lines localized due to .” stratification This matches the scenario described, where is internal grooving at the bottom of steam condensate piping characteristic of . Hence, is correct. CO#-induced corrosion option A Question #:2 - [Other Damage Mechanisms] In a naphthenic acid corrosive (NAC) environment, what is the effect of sulfur? No effect Sulfide cracking Inhibition API - API-571 Certs Exam 2 of 6 Pass with Valid Exam Questions Pool D. A. B. C. D. Corrosion accelerator Answer: C Explanation According to : API RP 571 Section 5.1.3.4 (Naphthenic Acid Corrosion - NAC) “Sulfur can act as an inhibitor to NAC. Where sulfur content in crude is high, a reduction in naphthenic acid corrosion is sometimes observed, especially in certain parts of vacuum and atmospheric units. However, this is not universally reliable, and corrosion can still occur based on local operating conditions and metal temperatures.” Thus, is the correct choice, as sulfur can NAC under some conditions. Option C (Inhibition) reduce Question #:3 - [Environmental-Assisted Cracking] Temper embrittlement is defined as: An increase in ductility and notch toughness caused by postweld heat treatment (PWHT) or high- temperature service above 120°F (49°C). A reduction in ductility and notch toughness caused by postweld heat treatment (PWHT) or low- temperature service below 120°F (49°C). A reduction in fracture toughness caused by long-term exposure in the temperature range of 650°F to 1070°F (345°C to 575°C). An increase in toughness caused by long-term exposure in the temperature range of 650°F to 1100°F (345°C to 595°C). Answer: C Explanation API RP 571 describes as: Temper Embrittlement “A mechanism that leads to a due to metallurgical degradation reduction in fracture toughness long-term in the temperature range of .” exposure 650°F to 1070°F (345°C to 575°C) “It affects Cr-Mo steels and is not easily detected except by impact testing.” Therefore, most accurately defines the condition based on the recognized API description. option C Question #:4 - [Aqueous Corrosion] For exchangers where the cooling water chemistry is poorly maintained, what can be done to improve corrosion resistance? API - API-571 Certs Exam 3 of 6 Pass with Valid Exam Questions Pool A. B. C. D. A. B. C. D. Lower the water velocity Increase the tube diameter Upgrade the metallurgy of the exchanger Increase the process side temperature above 212°F (100°C) Answer: C Explanation From API RP 571, under : Cooling Water Corrosion “If proper water treatment is not feasible or consistently maintained, upgrading the metallurgy of exchanger tubes to more corrosion-resistant materials such as stainless steel or titanium may be necessary.” “This is especially important in seawater or brackish water cooling applications or in once-through systems.” (Reference: API RP 571, Section 4.3.1.1 – Cooling Water Corrosion) Thus, the most effective long-term solution in cases of uncontrolled water quality is to , upgrade metallurgy making correct. option C Question #:5 - [Aqueous Corrosion] The stream from a crude atmospheric overhead goes to the tube side of a shell-and-tube condenser with a temperature of 300°F (149°C) and a pressure of 10 psig (69 kPa). As the stream begins to condense water, its hydrochloric acid content lowers the water pH to about 4.0. Which of the following would be the best alloy selection for the tubes with cooling water on the shell side? 410 Stainless Steel Titanium 9 Cr-1 Mo Steel 316 Stainless Steel Answer: B Explanation API RP 571 notes in the context of in overhead condensers: Hydrochloric Acid Corrosion “Titanium is highly resistant to low pH acidic aqueous phases, including hydrochloric acid formed during condensation in overhead systems.” API - API-571 Certs Exam 4 of 6 Pass with Valid Exam Questions Pool A. B. C. D. A. B. C. D. “Stainless steels like 316 and 410 are in the presence of free chlorides at low pH and elevated not suitable temperatures.” (Reference: API RP 571, Section 4.3.3.3 – Hydrochloric Acid Corrosion) Thus, is the preferred alloy under the described acidic and high-temperature conditions, making Titanium correct. option B Question #:6 - [High-Temperature Corrosion] The 300 series stainless steels (austenitic stainless steels) are generally resistant to oxidation up to what temperature? 1300°F (704°C) 1400°F (760°C) 1500°F (815°C) 1600°F (871°C) Answer: C Explanation According to API RP 571, under Oxidation: “Austenitic stainless steels (300 Series) are generally used for oxidation resistance up to about 1500°F (815° C). At higher temperatures, scaling and loss of protective chromium oxide layers increase.” “Above these temperatures, specialized high-temperature alloys may be required.” (Reference: API RP 571, Section 5.1.1 – Oxidation) Therefore, option C is the correct answer. Question #:7 - [High-Temperature Corrosion] The form of corrosion most often caused by sulfidation is typically described as: General or uniform corrosion High-temperature corrosion Localized erosion-corrosion Sulfide cracking corrosion API - API-571 Certs Exam 5 of 6 Pass with Valid Exam Questions Pool A. B. C. D. A. B. Answer: A Explanation API RP 571 – : Sulfidation “Sulfidation generally results in at temperatures above 500°F (260° uniform thinning of iron-based alloys C).” “It is classified as a form of , although it can be accelerated in turbulent flow areas.” general corrosion So, is correct. option A Question #:8 - [Aqueous Corrosion] Blistering and hydrogen-induced cracking (HIC) damage are most affected by what aspect of steels? Inclusions Hardness Residual Stress Permeability Answer: A Explanation API RP 571 discusses Hydrogen-Induced Cracking (HIC) and Blistering under the section: “HIC and blistering are most strongly influenced by non-metallic inclusions, particularly elongated manganese sulfide (MnS) inclusions, which serve as trap sites for hydrogen atoms.” “These inclusions create local planes of weakness where atomic hydrogen recombines into molecular hydrogen (H#), causing high pressure and cracking.” (Reference: API RP 571, Section 4.2.2.7 – Hydrogen Blistering and HIC) Thus, inclusions are the critical material factor, making option A correct. Question #:9 - [Aqueous Corrosion] Which of the following is the lowest threshold temperature at which creep damage is a concern in carbon steel with tensile strength > 60ksi (414 MPa)? 600°F (316°C) 700°F (371°C) API - API-571 Certs Exam 6 of 6 Pass with Valid Exam Questions Pool C. D. A. B. C. D. 800°F (427°C) 900°F (482°C) Answer: B Explanation API RP 571 states in the section on : Creep Damage “Creep damage in carbon steels generally becomes a concern above 700°F (371°C), especially for steels with higher tensile strength (greater than 60 ksi).” “For prolonged exposure above this temperature, time-dependent deformation can lead to material degradation and cracking, especially at weldments and stress concentrations.” Thus, the lowest threshold for creep in high-strength carbon steels is , making correct. 700°F (371°C) option B Question #:10 - [Aqueous Corrosion] Which of the following can cause hydrogen embrittlement of carbon steel? High-temperature hydrogen attack (HTHA) Cleaning and pickling in caustic solutions Welding with wet electrodes Improper postweld heat treatment (PWHT) Answer: D Explanation API RP 571 defines as: Hydrogen Embrittlement “Improper PWHT can trap hydrogen within the microstructure of carbon steel or fail to relieve residual stresses, both of which increase the risk of .” hydrogen embrittlement “Moisture in electrodes contributes to hydrogen-induced cracking, but embrittlement from atomic hydrogen is more directly tied to heat treatment and microstructure.” Thus, is the most accurate. option D About certsout.com certsout.com was founded in 2007. We provide latest & high quality IT / Business Certification Training Exam Questions, Study Guides, Practice Tests. We help you pass any IT / Business Certification Exams with 100% Pass Guaranteed or Full Refund. Especially Cisco, CompTIA, Citrix, EMC, HP, Oracle, VMware, Juniper, Check Point, LPI, Nortel, EXIN and so on. 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