Online Access Free API-571 Practice Test

(Deaerators that have not been postweld heat-treated are commonly subject to:)

• A.Corrosion fatigue
• B.Caustic stress corrosion cracking
• C.Vibration-induced fatigue
• D.Steam blanketing

Which of the following is the best description of the surface appearance of metals with chloride stress corrosion cracking?

• A.Highly branched crazed cracking
• B.Concentric ring "beach mark" cracking
• C.Linear cracking along weld heat-affected zones
• D.Linear cracking with few branches extending away from welds

Which of the following damage mechanisms is related to steel hardness?

• A.Hydrogen-induced cracking
• B.Sulfide stress corrosion cracking
• C.Hydrogen blistering
• D.Stress-oriented hydrogen-induced cracking

Blistering and hydrogen-induced cracking (HIC) damage are most affected by what aspect of steels?

• A.Hardness
• B.Inclusions
• C.Residual Stress
• D.Permeability

Severe internal grooving corrosion is found at the bottom of a 4-inch (101.6 mm) carbon steel piping system in steam condensate service. Which of the following is the most likely cause?

• A.Carbon dioxide corrosion
• B.Ammonium bisulfide corrosion
• C.Erosion-corrosion
• D.Carbonate corrosion