Free API API-571 Study Guides Exam Questions and Answer

API-571 Exam Dumps, API-571 Practice Test Questions

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NEW QUESTION # 10
__________ is usually found in aqueous environments or services where water is sometimes or always present, especially where stagnant or low-flow conditions allow the growth of microorganisms.

• A. HIC
• B. SOHIC
• C. MIC
• D. None of the above

Answer: C

NEW QUESTION # 11
Sigma phase occurs in Ferritic, martensitic, austenitic and duplex stainless steels when exposed to temperatures in the range of _____.

• A. 537(o) C - 954(o) C
• B. 584(o) C - 840(o) C
• C. 676(o) C - 760(o) C
• D. 621(o) C - 926(o) C

Answer: A

NEW QUESTION # 12
Different organisms thrive on different nutrients including inorganic substances (Sulfur, H(2)S), and organic substances (Hydrocarbons, Organic acids). In addition, all organisms require a source of carbon, nitrogen and _______ for growth.

• A. Water
• B. Phosphorous
• C. Oxygen
• D. Manganese

Answer: B

NEW QUESTION # 13
A hard, brittle surface layer will develop on some alloys due to exposure to high temperature process streams containing high levels of nitrogen compounds such as ammonia or cyanides, particularly under reducing conditions, is called _______.

• A. Spheroidization
• B. Nitriding
• C. None of the above
• D. Carburization

Answer: B

NEW QUESTION # 14
______ is most likely found in hard welds and heat affected zones and in high strength components.

• A. HIC
• B. SSC
• C. SOHIC
• D. Carburization

Answer: B

Explanation:
Explanation/Reference:

NEW QUESTION # 15
The most common method used for monitoring underground structures is measuring the structure to soil ______ using dedicated reference electrodes near the structure.

• A. Electrolyte
• B. Corrosiveness
• C. Resistivity
• D. Potential

Answer: D

NEW QUESTION # 16
A carbon steel bundle from the overhead condenser in the crude unit operates at 300(o) F and is in hydrochloric acid service. It showed severe pitting type corrosion when pulled for inspection. What type of material would be best suited for this service?

• A. 5Cr-0.5Mo
• B. Titanium
• C. 316 stainless steel
• D. 9Cr-1Mo

Answer: B

NEW QUESTION # 17
With cooling water corrosion, _________ oxygen content tends to ________ carbon steel corrosion rates.

• A. Increasing, increasing
• B. Decreasing, increasing
• C. Increasing, decreasing
• D. Decreasing, decreasing

Answer: A

NEW QUESTION # 18
Naphthenic acid corrosion (NAC) is most severe in what phase of flow?

• A. Water phase
• B. Vapor phase
• C. Hydrocarbon phase
• D. Two phase

Answer: D

Explanation:
API RP 571 on Naphthenic Acid Corrosion (NAC) details:
"NAC is most aggressive in two-phase flow where the shear stress is high, such as in elbows, reducers, and at orifices."
"High velocity and turbulence in two-phase flow strip protective layers and accelerate corrosion." Therefore, option A is the correct and most critical phase.

NEW QUESTION # 19
Amine stress corrosion cracking is a term applied to the cracking of steels under the combined actions of ________ and __________ in aqueous alkanolamine systems used to remove/absorb H(2)S and/or CO(2) and their mixtures from various gas and liquid hydrocarbon streams.

• A. Tensile stress, corrosion
• B. Temperature, pressure
• C. Pressure, stress
• D. Temperature, corrosion

Answer: A

NEW QUESTION # 20
In general, the resistance of carbon steel and other alloys to High temperature corrosion is determined by the ________ content of the material.

• A. Molybdenum
• B. Carbon
• C. All of the above
• D. Chromium

Answer: D

NEW QUESTION # 21
Sulfidation is primarily caused by ________ and other reactive sulfur species as a result of the thermal decomposition of sulfur compounds at high temperatures.

• A. Sulfur trioxide
• B. H(2)S
• C. Sulfates
• D. Sulfur dioxide

Answer: B

NEW QUESTION # 22
At elevated temperature, the carbide phases in certain carbon steels are unstable and may decompose into
_______. This decomposition is known as graphitization.

• A. Silicon
• B. Graphite nodules
• C. Graphite dust
• D. Carbon dust

Answer: B

NEW QUESTION # 23
At high temperatures, metal components can slowly and continuously deform under load below the yield strength. This time dependent deformation of stressed components is known as _______?

• A. Creep
• B. Hardening
• C. Ductility
• D. Softening

Answer: A

NEW QUESTION # 24
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 # 25
_________ 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. HIC
• B. Cl SCC
• C. SSC
• D. SOHIC

Answer: B

NEW QUESTION # 26
Which of these materials is susceptible to 885(o) F embrittlement?

• A. 400 Series SS
• B. Both A and B
• C. 5Cr-1Mo
• D. Duplex SS

Answer: B

NEW QUESTION # 27
With 885º F embrittlement, increasing amounts of ________ increase susceptibility to damage when operating in the high temperature range of concern.

• A. Hardness
• B. Hydrogen
• C. Chromium
• D. Ferrite

Answer: D

NEW QUESTION # 28
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