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Question 32/65
What alloy element most improves naphthenic acid corrosion (NAC) resistance?
Correct Answer: A
API RP 571, Naphthenic Acid Corrosion:
"Molybdenum significantly improves resistance to naphthenic acid attack. Alloys such as 317, 316Mo, and 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 A - Molybdenum.
"Molybdenum significantly improves resistance to naphthenic acid attack. Alloys such as 317, 316Mo, and 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 A - Molybdenum.
- Question List (65q)
- Question 1: One way to prevent oxide scale formation on alloy steel is t...
- Question 2: What damage mechanism can occur in wet H#S environments and ...
- Question 3: (Amine stress corrosion cracking is found primarily in the:)...
- Question 4: Cooling water corrosion of exchanger tubes is typically incr...
- Question 5: Naphthenic acid corrosion (NAC) is most severe in what phase...
- Question 6: Besides corrosion, what other damage mechanism in hydrofluor...
- Question 7: Brittle fracture of a component is closely related to:...
- Question 8: Hydrogen permeation or diffusion rates associated with wet H...
- Question 9: Sigma phase embrittlement can occur in which of the followin...
- Question 10: 300 series austenitic stainless steels susceptible to polyth...
- Question 11: Proactive and retroactive positive material identification p...
- Question 12: What is the best way to inspect for brittle fracture?...
- Question 13: (Sulfidation is known to be accelerated by the presence of:)...
- Question 14: The most important alloying element for prevention of high-t...
- Question 15: Metal dusting usually occurs in the operating temperature ra...
- Question 16: What arbitrary value of hydrogen sulfide in water is often u...
- Question 17: Steel hardness and strength are critical factors for what ty...
- Question 18: A nickel-based buttering layer is often used when welding au...
- Question 19: The rate of spheroidization is affected by:...
- Question 20: Which of the following is related to all wet H#S damage mech...
- Question 21: An inspector observes sharp-edged pitting in piping immediat...
- Question 22: Temper embrittlement is a metallurgical change that is:...
- Question 23: Which of the following damage mechanisms is related to steel...
- Question 24: Convection section soot blowers that have steam supplies wit...
- Question 25: The primary cause of ammonium chloride corrosion is the form...
- Question 26: (Prevention of high-temperature hydrogen attack is usually a...
- Question 27: The most effective means of preventing caustic stress corros...
- Question 28: Which of the following is considered resistant to cracking i...
- Question 29: Which of the following will experience the highest oxidation...
- Question 30: Blistering and hydrogen-induced cracking (HIC) damage are mo...
- Question 31: Which of the materials listed are not susceptible to Chlorid...
- Question 32: What alloy element most improves naphthenic acid corrosion (...
- Question 33: (Typically, surface decarburization will have what effect on...
- Question 34: Microbiologically induced corrosion is largely independent o...
- Question 35: In what damage mechanism does hydrogen combine with carbides...
- Question 36: Which damage mechanism will not benefit much from PWHT mitig...
- Question 37: (Graphitization occurs in:)
- Question 38: To avoid cooling water scaling, process side inlet temperatu...
- Question 39: (A metal cracks because of stress relaxation during postweld...
- Question 40: (Concentration Cell Corrosion is best described as corrosion...
- Question 41: What type of damage is affected by higher hydrogen partial p...
- Question 42: Temper embrittlement is defined as:...
- Question 43: (Which of the following can be used to confirm 885 °F (475 °...
- Question 44: Erosion and erosion-corrosion metal loss is characterized by...
- Question 45: (Creep damage can be mitigated by:)...
- Question 46: H#S content, pH, temperature, velocity, and oxygen concentra...
- Question 47: Phosphoric acid corrosion in polymerization units is usually...
- Question 48: The 300 series stainless steels (austenitic stainless steels...
- Question 49: (Increased corrosion rates have been observed in equipment a...
- Question 50: Caustic corrosion is most often associated with:...
- Question 51: (What steel alloy is no longer recommended for services susc...
- Question 52: Why are high-cycle fatigue cracks difficult to detect with n...
- Question 53: Polythionic acid stress corrosion cracking is:...
- Question 54: Corrosion under insulation mitigation is best achieved by:...
- Question 55: Which of the following is a critical factor for chloride str...
- Question 56: The type of organic acids in crude feedstocks that are of mo...
- Question 57: If thermal shock damage may be present, which of the followi...
- Question 58: Short-term stress rupture is a/an:...
- Question 59: The stream from a crude atmospheric overhead goes to the tub...
- Question 60: Which of the following generally manifests itself as a subsu...
- Question 61: Severe internal grooving corrosion is found at the bottom of...
- Question 62: To detect wet insulation that might give rise to corrosion u...
- Question 63: Aggressive ammonium chloride corrosion often occurs:...
- Question 64: Cracks formed by carbonate stress corrosion are best detecte...
- Question 65: Which of the following can increase the corrosion rate of ca...
