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NEW QUESTION # 97
Stresses acting on the weldments are significantly ________ when austenitic stainless steel filler metal is used. A nickel based filler metal has a coefficient of thermal expansion closer to carbon steel resulting in significantly lower stress at elevated temperatures.
- A. None of the above
- B. Lower
- C. Altered
- D. Higher
Answer: D
NEW QUESTION # 98
The presence of _________ can destabilize the scale and turn it into a nonprotective scale.
- A. H(2)S
- B. H(2)
- C. O(2)
- D. H(2)O
Answer: D
NEW QUESTION # 99
If wet electrodes or high moisture content flux weld electrodes are used to weld carbon steel, hydrogen can be charged into the steel resulting in _________.
- A. Loss of ductility
- B. Reduced tensile strength
- C. All of the above
- D. Delayed cracking
Answer: D
NEW QUESTION # 100
Corrosion due to acidic sour water containing H(2)S at a pH between 4.5 and 7.0 is called sour water corrosion. Carbon dioxide (CO(2)) may also be present. Which of the following materials is susceptible to sour water corrosion?
- A. Carbon steel
- B. 300 Series SS
- C. 400 Series SS
- D. Both B and C
Answer: A
NEW QUESTION # 101
At elevated temperature, the carbide phases in certain carbon steels are unstable and may decompose into
_______. This decomposition is known as graphitization.
- A. Carbon dust
- B. Graphite nodules
- C. Graphite dust
- D. Silicon
Answer: B
NEW QUESTION # 102
Which of the following alkanolamine systems is the most aggressive in causing amine corrosion?
- A. Diethanolamine (DEA)
- B. Diglycolamine (DGA)
- C. Methyldiethanolamine (MDEA)
- D. Monoethanolamine (MEA)
Answer: D
NEW QUESTION # 103
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. 316 stainless steel
- C. 9Cr-1Mo
- D. Titanium
Answer: D
NEW QUESTION # 104
Which of these cast irons are not susceptible to graphitic corrosion?
- A. None of the above
- B. Black Cast iron
- C. Gray cast iron
- D. White cast iron
Answer: D
NEW QUESTION # 105
Refractory lined equipment should be designed for erosion, thermal shock and __________.
- A. Thermal expansion
- B. Thermal fatigue
- C. Thermal contraction
- D. All of the above
Answer: A
Explanation:
Explanation
NEW QUESTION # 106
Hydriding of titanium is a metallurgical phenomenon in which hydrogen diffuses into the titanium and reacts to form an embrittling phase. This can result in a complete loss of _________ with no noticeable sign of corrosion or loss of thickness.
- A. Hardness
- B. Carbides
- C. Ductility
- D. Strength
Answer: C
NEW QUESTION # 107
_________ corrosion rates are found in a gas oil desulfurizers and hydrocrackers than naphtha desulfurizers and hydrocrackers by a factor of almost "2".
- A. Lower
- B. Sulfidation
- C. Hydrogen corrosion
- D. Higher
Answer: D
NEW QUESTION # 108
Which of the following alkanolamine systems is the least aggressive in causing amine corrosion?
- A. Diethanolamine (DEA)
- B. Diglycolamine (DGA)
- C. Monoethanolamine (MEA)
- D. Methyldiethanolamine (MDEA)
Answer: D
NEW QUESTION # 109
A prime location for erosion is:
- A. Any superheated steam piping.
- B. Downstream of a gate valve.
- C. In catalyst piping.
- D. Upstream of a pump.
Answer: C
NEW QUESTION # 110
_________ corrosion rates are found in a gas oil desulfurizers and hydrocrackers than naphtha desulfurizers and hydrocrackers by a factor of almost "2".
- A. Sulfidization
- B. Lower
- C. Hydrogen corrosion
- D. Higher
Answer: D
NEW QUESTION # 111
Vibration-induced fatigue can be eliminated or reduced through _________ and the use of supports and vibration dampening equipment. Material upgrades are not usually a solution.
- A. Dummy legs
- B. None of the above
- C. Hangers
- D. Design
Answer: D
NEW QUESTION # 112
_________ is accelerated high temperature wastage of materials that occurs when contaminants in the fuel form deposits and melt on the metal surfaces.
- A. Spheroidization
- B. None of the above
- C. Fuel ash corrosion
- D. Dealloying
Answer: C
NEW QUESTION # 113
Stainless steels have higher coefficients of thermal expansion than carbon steel or low alloy steel or nickel based alloys and are more likely to see _________.
- A. None of the above
- B. Higher stresses
- C. Higher temperatures
- D. Higher pressure
Answer: B
NEW QUESTION # 114
Cracks that are typically straight, non-branching, and devoid of any associated plastic deformation are likely associated with which type of failure?
- A. Thermal fatigue
- B. Temper embrittlement
- C. Brittle fracture
- D. Stress corrosion cracking
Answer: C
NEW QUESTION # 115
A quick test for embrittlement from _________ is a bend test or crush test. Unaffected material will be crushed in a ductile fashion while embrittled components will crack with no signs of ductility.
- A. Titanium Hydriding
- B. None of the above.
- C. Temper embrittlement
- D. Caustic embrittlement
Answer: A
NEW QUESTION # 116
A form of thermal cracking, __________, can occur when high and nonuniform thermal stresses develop over a relatively short period of time in a piece of equipment due to differential expansion and contraction.
- A. Linear expansion
- B. Thermal shock
- C. Thermal stress
- D. Thermal expansion
Answer: B
NEW QUESTION # 117
__________ testing is the best method to determine the susceptibility of a material to hydrogen stress cracking.
- A. SWUT
- B. Hardness
- C. AUT
- D. Acoustic
Answer: B
NEW QUESTION # 118
Cooling water corrosion can result in many different forms of damage including general corrosion, pitting corrosion, ________, stress corrosion cracking and fouling.
- A. SOHIC
- B. MIC
- C. HIC
- D. All of the above
Answer: B
Explanation:
Explanation/Reference:
NEW QUESTION # 119
Refractory anchor material must be compatible with the _________ of the base metal
- A. Welding
- B. Thermal coefficient
- C. Ductility
- D. Composition
Answer: B
NEW QUESTION # 120
What is the chemical symbol for propane or propylene?
- A. C4
- B. C²
- C. CH4
- D. C3
Answer: D
NEW QUESTION # 121
The level of creep damage is a function of the material and the coincident _________ level at which the creep deformation occurs.
- A. Pressure/Stress
- B. None of the above
- C. Temperature/Stress
- D. Pressure/Temperature
Answer: C
NEW QUESTION # 122
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