API api-571 practice test

Question 1

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

Question 2

What treatment is used to prevent boiler feed water corrosion?

• A. Oxide scavengers are added to process
• B. Oxygen scavengers are added to process
• C. Sulfide scavengers are added to process
• D. Sulfur scavengers are added to process

Question 3

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).

Question 4

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.

Question 5

Which of the following is not a major factor associated with boiler water condensate corrosion?

• A. Operating pressure
• B. Oxygen content
• C. Carbon dioxide content
• D. Process ph
• E. Temperature

Question 6

Sulfidation usually creates:

• A. Uniform corrosion.
• B. Isolated pitting.
• C. Intergranular cracking.
• D. Transgranular cracking.
• E. Hard and brittle zones.
• F. Inspection nightmares.

Question 7

Sulfidation is primarily caused by:

• A. Impacting particles.
• B. Sulfur compounds decomposing at higher temperatures.
• C. Sulfur compounds being created in the FCCU (Cat Cracking Unit).
• D. Elemental sulfur collecting in stagnate areas, e.g. dead legs.
• E. Operators failing to adequately control the ph of sulfur streams.

Question 8

Resistance to sulfidation increases as the:

• A. Chromium content in the material increases.
• B. Nickel content in the material increases.
• C. Material’s tensile strength decreases.
• D. Material’s tensile strength increases.

Question 9

Sulfidation of iron-based alloys usually begins at about:

• A. 150 oF.
• B. 250 oF.
• C. 500 oF.
• D. 1100 oF.

Question 10

Which of the following is not a major factor associated with corrosion by sulfidation?
A. Alloy composition
B. Operating pressure
C. Operating temperature
D. Sulfur content

Question 11

Mechanical fatigue can cause cracks that initiate from the surface and often form a:

• A. Clam shell appearance.
• B. Snail shell appearance.
• C. Turtle shell appearance.
• D. Shell Oil shell appearance.
• E. Taco shell appearance.

Question 12

Inspecting for high-cycle fatigue can be difficult since:

• A. The cracks are extremely tight.
• B. Predicting the location of cracking is difficult.
• C. Once the crack begins, only a few cycles are needed for the crack to lead to failure.
• D. Often the equipment is vibrating making non-destructive evaluations difficult.

Question 13

The endurance limit is usually about:

• A. 10-20% of a material’s ultimate tensile strength.
• B. 40-50% of a material’s ultimate tensile strength
• C. 10-20% of a material’s yield strength.
• D. 40-50% of a material’s yield strength.
• E. Half way up the ladder of a 150’ column (tower).

Question 14

Which material does not have an endurance limit?
A. Non-normalized carbon steel
B. Normalized carbon steel
C. Stainless steel
D. Titanium

Question 15

Fatigue will not occur in carbon steel if stresses are below the:

• A. Transition limit.
• B. Endurance limit.
• C. Hardening limit.
• D. Speed limit.