Dissimilar weld metal cracking occurs because the coefficients of thermal expansion between ferritic steels and 300 Series stainless steels differ by ________ or more.
A. 10%
B. 15%
C. 20%
D. 30%
Increasing chromium content in the alloy improves resistance to sulfidation. However, there is little improvement with increasing chromium content until about ________ Cr.
A. 3-5
B. 5-7
C. 7-9
D. 9-12
Amine stress corrosion cracking is most often associated with lean amine services. The pure alkanolamine does not cause cracking. Cracking in rich amine services are most often associated with _______ problems.
A. H²S
B. Stress
C. Wet H²S
D. Temperature
Time to failure by thermal fatigue is primarily affected by:
A. Magnitude of stress and operating temperature.
B. Magnitude of stress and number of cycles.
C. Carbon content in material and operating temperature.
D. Carbon content in material and number of cycles.
Which of the following materials is susceptible to CO?corrosion?
A. Carbon steel
B. Stainless steel
C. Duplex stainless steel
D. Both B and C
_________ of the amine system is the most effective way to prevent amine corrosion.
A. Proper concentration
B. Proper operation
C. Proper design
D. Proper startup
Corrosion from oxygen in boiler feed water usually creates:
A. Uniform corrosion.
B. Isolated pitting.
C. Intergranular cracking.
D. Transgranular cracking.
E. Hard and brittle zones.
In order to minimize and prevent amine SCC, PWHT all carbon steel welds in accordance with API RP _____.
A. 751
B. 912
C. 510
D. 945
Phosphoric acid corrosion is usually found in ________ areas.
A. High velocity
B. Low velocity
C. High temperature
D. Low temperature
Units where graphitization may be suspected are the FCCU and the _____ unit.
A. Hydrotreater
B. Coker
C. Alky
D. None of the above
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