At high temperatures, metal components can slowly and continuously deform under load below the yield stress. This time dependent deformation of stressed components is known as __________.
A. Deformation
B. Fatigue
C. Creep
D. Thermal fatigue
Which API RP recommends programs to monitor small-bore piping, flange faces, blistering and HIC/SOHIC in HF alky units?
A. 574
B. 751
C. 571
D. 980
Corrosion under insulation becomes more severe at metal temperatures between ________ and ________, where water is less likely to vaporize and insulation stays wet longer.
A. 100º C, 121º C
B. 92º C, 116º C
C. 114º C, 132º C
D. None of the above
In susceptible materials, the primary factor that affects sigma phase formation is the ________ at elevated temperatures.
A. Time of exposure
B. Pressure
C. Stress
D. Velocity
Nitriding begins above ________ and becomes severe above _______.
A. 500º F, 800º F
B. 600º F, 900º F
C. 800º F, 1000º F
D. 700º F, 1100º F
For furnaces, to prevent PASCC, keep the firebox heated above the dewpoint to keep ________ from forming.
A. Water
B. Acids
C. Moisture
D. Corrosion
300 Series SS can be used for sour water service at temperatures below ____________, where Chloride SCC is not likely.
A. 120º F
B. 140º F
C. 150º F
D. 175º F
In HF service, carbon steel forms a protective _________ scale in dry concentrated acid. Loss of the protective scale through high velocities or turbulence will result in greatly accelerated corrosion rates.
A. Chloride
B. Fluoride
C. Iron sulfide
D. Iron oxide
Alloys with increased amounts of _______ show improved resistance to naphthenic acid corrosion.
A. Chromium
B. Molybdenum
C. Nickel
D. Carbon
With 885?F embrittlement, increasing amounts of ________ increase susceptibility to damage when operating in the high temperature range of concern.
A. Chromium
B. Hardness
C. Ferrite
D. Hydrogen
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