Mitigation of CUI is best achieved by _________.
A. A properly documented inspection program
B. A properly installed insulation system
C. A properly applied coating system
D. A properly documented NDE program
The signature mark of a fatigue failure is a _______ type fingerprint that has concentric rings.
A. Eyebrow
B. Half-Moon
C. Radii
D. Clam Shell
Corrosion due to acidic sour water containing H²S at a pH between 4.5 and 7.0 is called sour water corrosion. Carbon dioxide (CO²) 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
__________ is a change in the microstructure of certain carbon steels and 0.5 Mo steels after long term operation in the 800º F to 1100º F range.
A. Graphitization
B. Softening
C. Temper Embrittlement
D. Creep
Reheat cracking is most frequently observed in _______ grained sections of a heat- affected zone.
A. Course
B. Fine
C. Dense
D. Treated
Which of the following materials are the least susceptible to caustic embrittlement?
A. Carbon steel
B. Stainless steel
C. 9Cr-0.5 Mo
D. Nickel base alloys
Cracking can occur at low caustic levels if a concentrating mechanism is present. In such cases, caustic concentrations of ________ ppm are sufficient to cause cracking.
A. 50-100
B. 100-150
C. 150-200
D. 200-250
A form of corrosion caused by living organisms such as bacteria, algae or fungi is _______ .
A. HIC
B. SOHIC
C. MIC
D. None of the above
Ammonium chloride corrosion is the general or localized corrosion, often pitting, normally occurring under ammonium chloride or amine salt deposits. All commonly used materials are susceptible to ammonium chloride corrosion. A small amount of _________ can lead to very aggressive corrosion.
A. Ammonium chloride
B. Amine
C. Water
D. Salt
SSC is a form of ________ stress corrosion cracking.
A. Hydrogen
B. Caustic
C. Polythionic
D. Alkaline
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