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NEW QUESTION # 19
_________ is surface initiated cracks caused by environmental cracking of 300 Series SS and some nickel based alloys under the combined action of tensile stress, temperature and an aqueous chloride environment.
The presence of dissolved oxygen increases the propensity for cracking.
- A. SOHIC
- B. Cl SCC
- C. HIC
- D. SSC
Answer: B
NEW QUESTION # 20
Hardness levels above ________ are highly susceptible to hydrogen stress cracking (HF).Time-to-failure decreases as the hardness increases.
- A. 241 BHN
- B. 237 BHN
- C. 247 BHN
- D. 225 BHN
Answer: B
NEW QUESTION # 21
What standard refers to Risk-Based-Inspection?
- A. RP 568
- B. RP 588
- C. RP 581
- D. RP 579
Answer: C
NEW QUESTION # 22
In order for PASCC to occur the material must be ______.
- A. PWHT
- B. Non-PWHT
- C. Sensitized
- D. Austenitic
Answer: C
NEW QUESTION # 23
With sulfidation, the presence of oxygen ________ corrosion
- A. Decreases
- B. Stops
- C. Has no effect on
- D. Increases
Answer: D
NEW QUESTION # 24
Which type of corrosion is most likely to occur in hydroprocess reactor effluent streams in units producing alkaline sour water?
- A. Caustic
- B. Ammonium chloride
- C. Amine
- 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 # 25
Which of the following is considered resistant to cracking in hydrofluoric acid service?
- A. ASTM A-325
- B. ASTM A-193 B5
- C. ASTM A-193 B7M
- D. ASTM A-193 B7
Answer: B
Explanation:
API RP 751 (referenced in RP 571) lists materials appropriate for HF acid alkylation service. It specifies:
"Chrome-moly steels such as ASTM A-193 B5 (5% Cr) bolts are preferred for their resistance to HF acid- induced cracking."
"Standard low alloy steels (e.g., B7) are not considered adequately resistant." (Reference: API RP 571 summary & API RP 751, Section 5.6.3 - Bolting Materials) Therefore, the correct and industry-approved answer is option A.
NEW QUESTION # 26
Hydrogen blisters may form as surface bulges on the ID, the OD on within the wall thickness of a pipe or pressure vessel. Blistering occurs from hydrogen generated by ______, not hydrogen gas from the process stream.
- A. Corrosion
- B. H²S
- C. Hydriding
- D. Sulfur
Answer: A
NEW QUESTION # 27
Reheat cracking is most frequently observed in _______ grained sections of a heat-affected zone.
- A. Treated
- B. Course
- C. Fine
- D. Dense
Answer: B
NEW QUESTION # 28
Thermal fatigue becomes of concern if the temperature swings exceed:
- A. 200 oF.
- B. 100 oF.
- C. 400 oF.
- D. 50 oF.
Answer: A
NEW QUESTION # 29
Susceptibility to temper embrittlement is largely determined by the presence of the alloying elements manganese and _______.
- A. Silicon
- B. Moly
- C. Chromium
- D. None of the above
Answer: A
NEW QUESTION # 30
PWHT is ___________ in preventing caustic SCC.
- A. Effective
- B. Not effective
- C. Not practical
- D. None of the above
Answer: A
NEW QUESTION # 31
Which of the following materials is affected by high temperature corrosion?
- A. Carbon steel
- B. 300 Series SS
- C. 400 Series SS
- D. All of the above
Answer: D
NEW QUESTION # 32
Naphthenic acid corrosion is most severe in _________ flow; in areas of high velocity or turbulence and in distillation towers where hot vapors condense to form liquid phase droplets.
- A. Three phase
- B. Single phase
- C. Two phase
- D. Negative phase
Answer: C
NEW QUESTION # 33
Components that have been carburized may have a change in the level of ________.
- A. Ferromagnetism
- B. Carbon
- C. Stress
- D. Chromium
Answer: A
NEW QUESTION # 34
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