API-571 Online Practice Questions and Answers
Corrosion of the anode may be significantly higher ________ to the connection to the cathode, depending on solution conductivity.
A. Parallel
B. Adjacent
C. Diagonally
D. Perpendicular
Temperature, ________ and stress are critical factors of stress rupture. This is usually found in furnaces with coking tendencies and fired heater tubes.
A. Pressure
B. Ductility
C. Time
D. Tensile strength
Which of the following materials are susceptible to polythionic acid SCC?
A. 300 Series SS
B. Alloy 600
C. Alloy 800
D. All of the above
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 H²S and/or CO² and their mixtures from various gas and liquid hydrocarbon streams.
A. Temperature, pressure
B. Pressure, stress
C. Temperature, corrosion
D. Tensile stress, corrosion
Sulfidation of iron-based alloys usually begins at about:
A. 150º F.
B. 250º F.
C. 500º F.
D. 1100º F.
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 regenerator reboiler and the regenerator are areas where the temperature and __________ of the amine stream are the highest and can cause significant corrosion problems.
A. Pressure
B. Stress
C. Turbulence
D. Concentration
Refractory anchors must be resistant to __________ in high temperature services.
A. Thermal fatigue
B. Thermal cracking
C. Stress cracking
D. Oxidation
Alloys with nickel content above _________ are highly resistant to Cl SCC. The greatest susceptibility is 8% to 12% nickel.
A. 15%
B. 20%
C. 30%
D. 35%
What method is most used to assure boiler feed water corrosion is not occurring?
A. Spot UT readings at turbulent areas
B. Profile RT at turbulent areas
C. Profile RT at stagnant areas
D. Laboratory analysis of boiler feedwater