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NEW QUESTION # 59
In pressure containing equipment, SOHIC and SCC damage is most often associated with __________.
- A. None of the above
- B. Internals
- C. Weldments
- D. Branches
Answer: C
NEW QUESTION # 60
Heat treatment can have a significant effect on the toughness and hence fatigue resistance of a metal. In general, ________ grained microstructures tend to perform better than _________ grained.
- A. Austenetic, martensitic
- B. Course, Fine
- C. Fine, Course
- D. Martensitic, austenetic
Answer: C
NEW QUESTION # 61
Metallic components form a surface __________ when exposed to sulfur compounds. This may react with air (oxygen) and moisture to form sulfur acids (polythionic acid).
- A. Caustic scale
- B. Oxide
- C. Sulfate scale
- D. Sulfide scale
Answer: D
NEW QUESTION # 62
For 5Cr-0.5Mo, what is the threshold temperature for creep?
- A. 500º F
- B. 800º F
- C. 600º F
- D. 700º F
Answer: B
NEW QUESTION # 63
Cracking of dissimilar weld metals occurs in the __________ side of a weld joining 300 Series SS and carbon steel.
- A. None of the above
- B. Ferritic
- C. Both of the above
- D. Austenitic
Answer: B
NEW QUESTION # 64
Which API RP recommends programs to monitor small-bore piping, flange faces, blistering and HIC/SOHIC in HF alky units?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
NEW QUESTION # 65
________ injection downstream of the desalter is another common method used to reduce the amount of HCl going overhead.
- A. Caustic
- B. Water
- C. Hydrogen
- D. Nitrogen
Answer: A
NEW QUESTION # 66
What structure is 410 stainless steel?
- A. Ferritic
- B. Duplex
- C. Martensitic
- D. Austenitic
Answer: C
NEW QUESTION # 67
Heat treatment can have a significant effect on the toughness and hence fatigue resistance of a metal. In general, ________ grained microstructures tend to perform better than _________ grained.
- A. Course, Fine
- B. Fine, Course
- C. Austenitic, martensitic
- D. Martensitic, austenitic
Answer: B
NEW QUESTION # 68
Which of the following is not a primary factor contributing to erosion?
- A. Impact angle (angle that impacting particles strike metal)
- B. Corrosiveness of the environment
- C. Size of impacting particles
- D. Velocity of impacting particles
- E. Density of impacting particles
Answer: B
NEW QUESTION # 69
Cracks formed by carbonate stress corrosion are best detected:
- A. with a wet fluorescent magnetic-particle testing technique.
- B. ultrasonic shear wave examination because cracks develop internally.
- C. with an Acoustic Emission Testing technique.
- D. with a penetrant testing technique used after abrasive or high pressure water blasting of the surface.
Answer: A
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, WFMT offers the best visibility, especially after proper surface prep.
Therefore, Option D is correct.
NEW QUESTION # 70
Sulfidation is primarily caused by:
- A. Impacting particles.
- B. Sulfur compounds being created in the FCCU (Cat Cracking Unit).
- C. Elemental sulfur collecting in stagnate areas, e.g. dead legs.
- D. Sulfur compounds decomposing at higher temperatures.
- E. Operators failing to adequately control the ph of sulfur streams.
Answer: D
NEW QUESTION # 71
Which of the following is the most significant result of spheroidization in steels?
- A. Loss of strength
- B. Increased potential for stress corrosion cracking
- C. Increased hardness
- D. Loss of ductility
Answer: A
Explanation:
As per API RP 571 Section 5.3.2.3 (Spheroidization):
"Spheroidization is the transformation of the microstructure of steels into spherical carbides, leading to reduced strength and hardness, especially after extended high-temperature exposure. It's commonly seen in carbon and low alloy steels in refining heaters and reactors."
* It reduces strength and sometimes hardness.
* It increases ductility, not reduces.
* SCC potential is not directly tied to this change.
Therefore, Option D (Loss of strength) is correct.
NEW QUESTION # 72
Which type of corrosion is most likely to occur in hydroprocess reactor effluent streams in units producing alkaline sour water?
- A. Ammonium chloride
- B. Amine
- C. Caustic
- D. Ammonium bisulfide
Answer: D
Explanation:
From API RP 571 and RP 932-B:
"In hydroprocessing reactor effluent systems, the most common corrosion mechanism is ammonium bisulfide (NH#HS) corrosion, which forms in the presence of hydrogen sulfide and ammonia."
"NH#HS attacks carbon steel aggressively under turbulent flow and at low pH." Correct answer is B - ammonium bisulfide corrosion.
NEW QUESTION # 73
Which of the following materials are generally not suitable for HF service?
- A. 300 Series SS
- B. Carbon steel
- C. 400 Series SS
- D. Both A and C
Answer: D
NEW QUESTION # 74
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