API API-571 Dumps

Exam: Corrosion and Materials

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Showing 1-20 of 454 Questions   (Page 1 out of 23)

Question No : 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 No : 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 No : 3

Where is PASCC normally located?

A. Adjacent to welds
B. On impellers
C. At stress risers
D. At flanges

Question No : 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 No : 5

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


Question No : 6

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

B. Hydrogen
C. Sulfur
D. Aqueous

Question No : 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 No : 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 No : 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 No : 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 No : 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 No : 12

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

A. Chromium
B. Molybdenum
C. Silicon
D. Aluminum

Question No : 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 No : 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 No : 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

Question No : 16

Hardness is primarily an issue with SSC. Typical low strength carbon steels should be
controlled to produce weld hardness less than ________.

A. 225 BHN
B. 237 BHN
C. 200 BHN
D. 240 BHN

Question No : 17

Titanium Hydriding damage occurs primarily in sour water strippers and amine units in the
overhead condensers, heat exchanger tubes and other titanium equipment operating
above _________.


Question No : 18

In HF service, carbon steel forms a protective _________ scale in dry concentrated acid.
Loss of the protective scale through high velocities or turbulence will result in greatly
accelerated corrosion rates.

A. Chloride
B. Fluoride
C. Iron sulfide
D. Iron oxide

Question No : 19

________ of a component is the most important factor in determining a components
resistance to mechanical fatigue.

A. Design
B. Temperature
C. Stress
D. Pressure

Question No : 20

_________ acid is most often used as a catalyst in polymerization units.

A. Polythionic
B. Naphthenic
C. Phosphoric
D. Sulfuric

Showing 1-20 of 454 Questions   (Page 1 out of 23)

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