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API API-571 Exam - Corrosion and Materials

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Questions & Answers for API API-571

Showing 1-15 of 454 Questions

Question #1

A 5Cr-1Mo piping system in the hydrogen unit shows significant internal wall loss after 2
years in service due to CO corrosion. Which material would be best suited to use to install
a new pipe system?

A. Titanium

B. 9Cr-1Mo

C. A-106 Gr B

D. 316 SS

Question #2

MIC is often found in _________, bottom water of storage tanks, piping with stagnant or
low flow and piping in contact with some soils.

A. Vessels

B. Heat exchangers

C. Drums

D. All of the above

Question #3

Where is PASCC normally located?

A. Adjacent to welds

B. On impellers

C. At stress risers

D. At flanges

Question #4

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

A. Transition limit.

B. Endurance limit.

C. Hardening limit.

D. Speed limit.

Question #5

300 Series SS can be used for sour water service at temperatures below ____________,
where Chloride SCC is not likely.

A. 120º F

B. 140º F

C. 150º F

D. 175º F

Question #6

Blistering, HIC, SOHIC and SSC damage can occur wherever there is a ____________

A. Wet H²S

B. Hydrogen

C. Sulfur

D. Aqueous

Question #7

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

A. Temperature

B. Pressure

C. Velocity

D. Number of cycles

Question #8

With sour water corrosion, at a given pressure, the HS concentration in the sour water
_________ as temperatures ________.

A. Increases, increases

B. Decreases, decreases

C. Increases, decreases

D. Decreases, increases

Question #9

Thermal fatigue cracks usually initiate on the _________ of the component. They are
generally wide and filled with oxides due to the elevated temperatures.

A. Surface


C. Welds

D. None of the above

Question #10

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

A. Operating pressure

B. Oxygen content

C. Carbon dioxide content

D. Process ph

E. Temperature

Question #11

Surface initiated cracks caused by environmental cracking of 300 Series SS and some
nickel based alloys under the combined action of tensile stress, temperature and an
aqueous chloride environmental is called ________. The presence of dissolved oxygen
___________ the propensity for cracking.

A. Cl SCC, Increases

B. Stress cracking, Increases

C. Cl SCC, Decreases

D. Stress cracking, Decreases

Question #12

_______ is the primary alloying agent that affects resistance to oxidation.

A. Chromium

B. Molybdenum

C. Silicon

D. Aluminum

Question #13

Vessels constructed after December, 1987 are subject to the requirements of ________ of
ASME Section VIII, Division 1.

A. UW-26

B. UG-31

C. UB-54

D. UCS-66

Question #14

Which of these materials are susceptible to brittle fracture?

A. Carbon steels

B. Low alloy steels

C. 400 Series SS

D. All of the above

Question #15

Which of the following are susceptible to thermal fatigue?

A. SA-516-70

B. SA-182 Gr B

C. SA-53 Gr B

D. All of the above

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