Corrosion and Materials Professional Version: Demo [ Total Questions: 10] Web: www.dumpscafe.com Email: support@dumpscafe.com API API-571 IMPORTANT NOTICE Feedback We have developed quality product and state-of-art service to ensure our customers interest. If you have any suggestions, please feel free to contact us at feedback@dumpscafe.com Support If you have any questions about our product, please provide the following items: exam code screenshot of the question login id/email please contact us at and our technical experts will provide support within 24 hours. support@dumpscafe.com Copyright The product of each order has its own encryption code, so you should use it independently. Any unauthorized changes will inflict legal punishment. We reserve the right of final explanation for this statement. API - API-571 Pass Exam 1 of 6 Verified Solution - 100% Result A. B. C. D. A. B. C. D. Category Breakdown Category Number of Questions Aqueous Corrosion 7 Material Degradation and Embrittlement 1 High-Temperature Corrosion 1 Other Damage Mechanisms 1 TOTAL 10 Question #:1 - [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 #:2 - [Material Degradation and Embrittlement] (Repeated) The best method for finding damage from sigma phase embrittlement is: Hardness testing Ductility testing Magnetic particle testing Metallographic testing API - API-571 Pass Exam 2 of 6 Verified Solution - 100% Result A. B. C. D. A. B. C. D. Answer: D Explanation Same as above. Sigma phase formation is a and not typically detected by NDE microstructural phenomenon methods like magnetic particle or surface hardness testing. Therefore, remains the definitive detection method, confirming again as the metallographic testing option D correct answer. Question #:3 - [Aqueous Corrosion] What arbitrary value of hydrogen sulfide in water is often used as the defining concentration where cracking damage becomes a problem in carbon steel pipe? 0.05% 0.5% 1 ppmw 50 ppmw Answer: D Explanation As per and further clarified in : API RP 571 API RP 939-C “An arbitrary threshold of in the aqueous phase is often used to define when carbon and low 50 ppmw H#S alloy steels become susceptible to cracking damage in wet H#S environments.” “Below this level, the risk of SSC, HIC, and SOHIC is considered lower, although damage has still occurred at lower concentrations depending on stress and metallurgical conditions.” Therefore, the correct answer is (50 ppmw). option D Question #:4 - [Aqueous Corrosion] The potential for galvanic corrosion will increase when: insulating dissimilar metals with different electro-chemical potentials. using a relatively large volume of anodic material. applying a coating to both metals. different metals are in contact with presence of electrolyte. API - API-571 Pass Exam 3 of 6 Verified Solution - 100% Result A. B. C. D. A. Answer: D Explanation From : API RP 571 Section 4.2.3 (Galvanic Corrosion) “Galvanic corrosion occurs when two dissimilar metals are in electrical contact in the presence of an electrolyte. The more anodic metal corrodes preferentially.” Contact and (like water or brine) is key to galvanic without insulation in presence of an electrolyte action. Insulating or coating prevents electrical connection or electrolyte contact, reducing corrosion risk. Hence, correctly describes the condition that increases galvanic corrosion potential. Option D Question #:5 - [Aqueous Corrosion] Cracks formed by carbonate stress corrosion are best detected: with a penetrant testing technique used after abrasive or high pressure water blasting of the surface. with an Acoustic Emission Testing technique. ultrasonic shear wave examination because cracks develop internally. with a wet fluorescent magnetic-particle testing technique. Answer: D Explanation According to : API RP 571 Section 5.1.2.6 (Carbonate Stress Corrosion Cracking - CSCC) “The cracking is usually intergranular and is most commonly detected using wet fluorescent magnetic-particle testing (WFMT) after surface cleaning. PT may not be sensitive enough to detect fine cracks formed by this mechanism.” Because CSCC cracks are typically surface-connected and very fine, offers the best visibility, WFMT especially after proper surface prep. Therefore, is correct. Option D Question #:6 - [Aqueous Corrosion] Internal galvanic corrosion in piping near the joint of two dissimilar metals is best detected by external: Liquid-penetrant testing API - API-571 Pass Exam 4 of 6 Verified Solution - 100% Result B. C. D. A. B. C. D. Metallographic examination Eddy-current testing Ultrasonic thickness testing Answer: D Explanation API RP 571 states under : Galvanic Corrosion “Because galvanic corrosion usually manifests as , thinning of the more anodic metal ultrasonic thickness taken near dissimilar metal joints are an effective way to detect this type of internal corrosion.” measurements “Surface NDE techniques like liquid penetrant or magnetic particle testing are not effective for detecting wall loss.” Thus, is correct. option D (ultrasonic thickness testing) Question #:7 - [High-Temperature Corrosion] Nitriding of steels becomes most severe at temperatures above: 200°F (95°C) 500°F (260°C) 600°F (315°C) 900°F (480°C) Answer: D Explanation API RP 571 under (Section 4.2.16): Nitriding “Nitriding occurs at elevated temperatures and is most severe at temperatures above .” 900°F (480°C) “This mechanism is associated with the reaction of ammonia or other nitrogen-containing compounds with the steel surface, leading to brittle nitride formation.” Therefore, the correct answer is D Question #:8 - [Other Damage Mechanisms] What alloy element most improves naphthenic acid corrosion (NAC) resistance? API - API-571 Pass Exam 5 of 6 Verified Solution - 100% Result A. B. C. D. A. B. C. D. Molybdenum Chromium Niobium Nickel Answer: A Explanation API RP 571, : Naphthenic Acid Corrosion “ significantly improves resistance to naphthenic acid attack. Alloys such as 317, 316Mo, and Molybdenum Alloy 20 are used in severe NAC environments due to higher Mo content.” “Chromium and nickel play secondary roles; molybdenum is the key element.” Answer is – Molybdenum. A Question #:9 - [Aqueous Corrosion] Which of the following damage mechanisms is related to steel hardness? Stress-oriented hydrogen-induced cracking Sulfide stress corrosion cracking Hydrogen-induced cracking Hydrogen blistering Answer: B Explanation API RP 571 details that: “Sulfide Stress Cracking (SSC) susceptibility increases significantly with increased hardness of the steel.” “NACE MR0175/ISO 15156 provides hardness limits for carbon and low-alloy steels to avoid SSC in sour environments. These are typically limited to 22 HRC or 248 Brinell.” “High hardness promotes crack initiation under tensile stress in sour environments (i.e., containing H#S).” (Reference: API RP 571, Section 4.2.2.1 – Sulfide Stress Corrosion Cracking) API - API-571 Pass Exam 6 of 6 Verified Solution - 100% Result A. B. C. D. While hydrogen-induced cracking (HIC) and blistering are related to hydrogen charging, SSC is the only , making correct. mechanism directly and critically impacted by hardness option B Question #:10 - [Aqueous Corrosion] The primary cause of ammonium chloride corrosion is the formation of salts: That may precipitate from high-temperature streams as they are cooled During water washing operations in streams containing traces of chlorides That may deposit when water evaporates to dry-out conditions as streams are heated When steam is injected into streams containing traces of chlorides Answer: A Explanation API RP 571 under details: Ammonium Chloride Corrosion “The corrosion results from the deposition of ammonium chloride salts from high-temperature process streams as they cool.” “This typically occurs in crude unit overheads or other systems where salts condense out as the stream temperature drops below their dew point.” “Corrosion becomes especially aggressive when the salts are wetted by condensation.” (Reference: API RP 571, Section 4.3.3.1 – Ammonium Chloride Corrosion) Therefore, is technically accurate and supported. option A About dumpscafe.com dumpscafe.com was founded in 2007. 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