API-571 Online Practice Questions and Answers

Corrosion in boiler feedwater and condensate return systems is usually the result of dissolved gases, oxygen and _______.

A. Carbon monoxide

B. H²O

C. Temperature

D. Carbon Dioxide

The presence of _________ can destabilize the scale and turn it into a nonprotective scale.

A. H²S

B. O²

C. H²

D. H²O

Geometry, stress level, number of cycles and _________ are the predominate factors in determining the fatigue resistance of a component.

A. Temperature

B. Material properties

C. Pressure

D. Velocity

Sulfidation is primarily caused by ________ and other reactive sulfur species as a result of the thermal decomposition of sulfur compounds at high temperatures.

A. Sulfur dioxide

B. H²S

C. Sulfur trioxide

D. Sulfates

With Cl SCC, ________ levels of chloride ________ the likelihood of cracking.

A. Decreasing, Increases

B. Increasing, Decreases

C. Increasing, Increases

D. Increasing, Eliminates

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

A 6", A106 Gr B, flanged line carrying caustic wash water at 200?F has signs of atmospheric corrosion. Which of the following may have help accelerate the corrosion?

A. Sulfides

B. Fly ash

C. Caustic D. None of the above

Reheat cracking is most frequently observed in _______ grained sections of a heat- affected zone.

A. Course

B. Fine

C. Dense

D. Treated

With thermal fatigue, time to failure is a function of the magnitude of the stress and the number of cycles and decreases with _________ stress and ________ cycles.

A. Increasing, Decreasing

B. Increasing, Increasing

C. Decreasing, Decreasing

D. Decreasing, Increasing

Which of the following is not a method used to prevent brittle fracture?

A. Thorough inspections

B. Strict controls on selecting construction materials

C. Post weld heat treatment

D. Controlling minimum operating temperatures