API API-571 Questions & Answers

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API-571

Corrosion and Materials Professional

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With steam blanketing, failure occurs as a result of in the tube from the internal steam pressure at the elevated temperature.

A . Stress risers B . Velocity

C . Hoop stress

D . Tensile strength

Answer: C

Carbon dioxide corrosion results when CO² dissolves in water to form acid. A . Sulfuric

B . Hydrochloric C . Carbonic

D . None of the above

Answer: C

Protection in a boiler from boiler feed water corrosion is accomplished by: A . Injecting chlorines to kill microbiological bugs.

B . Injecting caustic to lower the ph to < 4.0.

C . Lowering solids content in boiler feed water to less than 50 ppm. D . Maintaining a protective corrosion layer of magnetite (Fe3O4).

Answer: D

Susceptibility to hydrogen stress cracking with hardness. A . Increases, increasing

B . Decreases, increasing C . Decreases, Decreasing D . Both A and C

Answer: D

With sour water corrosion, corrosion increases with NH4HS concentration and velocity. A . Increasing, Decreasing

B . Increasing, Increasing C . Decreasing, Decreasing D . Decreasing, Increasing

Answer: B

is the main concern during start-up, shutdown and/or hydro testing for equipment/piping operating at elevated temperatures. This event can also occur in an auto refrigeration event in units processing light hydrocarbons. A . Stress fracture

B . Carburization C . Spheroidization D . Brittle fracture

Answer: D

With creep, increased stress due to loss in thickness from corrosion will time to failure. A . Increase

D . None of the above

Answer: B

With hydrofluoric acid corrosion, corrosion rates increase with temperatures and HF concentrations. A . Increasing, decreasing

B . Decreasing, increasing C . Increasing, increasing D . Decreasing, decreasing

Answer: A

To prevent hydrogen embrittlement, use lower strength steels and to temper the microstructure, improve

ductility and reduce residual stresses. A . Alloys

B . Preheat C . PWHT

D . All of the above

Answer: C

The level of creep damage is a function of the material and the coincident level at which the creep deformation occurs.

A . Pressure/Temperature B . Pressure/Stress

C . Temperature/Stress D . None of the above

Answer: C

A form of corrosion that can occur at the junction of dissimilar metals when they are joined together in a suitable electrolyte is .

A . Galvanic corrosion B . Anodic corrosion C . Cathodic corrosion D . All of the above

Answer: A

The primary factors affecting high temperature oxidation are metal temperature and . A . Pressure

B . Alloy composition C . Stress

Answer: B

Sulfuric acid promotes general and localized corrosion of carbon steel. Carbon steel heat affected zones may experience severe corrosion. Acid concentration, temperature, alloy content and are critical factors affecting sulfuric acid corrosion.

C . Velocity D . Ductility

Answer: C

Which of the following materials is affected by high temperature corrosion? A . Carbon steel

B . 300 Series SS C . 400 Series SS

D . All of the above

Answer: D

Many thermal fatigue cracks are filled with: A . chlorides.

B . hydroslime. C . oxides.

Answer: C

Ammonium chloride corrosion is the general or localized corrosion, often pitting, normally occurring under ammonium chloride or amine salt deposits. All commonly used materials are susceptible to ammonium chloride corrosion. A small amount of can lead to very aggressive corrosion.

A . Ammonium chloride B . Amine

C . Water D . Salt

Answer: C

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