API 571 Practice Exam #2 Questions And Correct Answers, 100% Verified
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Course
API 571
Institution
API 571
API 571 Practice Exam #2 Questions And Correct Answers, 100% Verified
Ammonium bisulfide corrosion is an aggressive corrosion occurring in hydroprocessing reactor effluent streams and in units handling alkaline sour water. Several major failures have occurred in hydroprocessing reactor effluent ...
API 571 Practice Exam #2 Questions And Correct
Answers, 100% Verified
Ammonium bisulfide corrosion is an aggressive corrosion occurring in hydroprocessing reactor effluent streams and in units handling alkaline sour water. Several major failures have occurred in hydroprocessing reactor effluent systems due to localized corrosion. The least resistant material to this type of corrosion is:
a) aluminum alloys
b) carbon steel
c) 300 Series SS
d) duplex SS
B
5.1.1.2.2 a)
For materials susceptible to sigma phase embrittlement, care should be taken to avoid:
a) Applying high stresses to sigmatized materials during shutdown, as a brittle
fracture could result
b) Solution annealing at 1950°F (1066°C) for four hours followed by a water quench
c) Ferrite grain growth in the range of 5% to 9% for Type 34 7 and somewhat less ferrite for Type 304
d) The exposure time to PWHT temperatures for stainless steel explosion cladded
CrMo steels
A
4.2.6.6 b)
Effective methods of inspection for thermal fatigue cracking are:
a) visual examination
b) MT
c) PT
d) all of the above
D
4.2.9.7 a)
What are the following 3 factors related to?
i) The materials' fracture toughness as measured in a Charpy impact test;
ii) The size, shape and stress concentration effect of a flaw;
iii) The amount of residual and applied stresses on the flaw.
a) Fatigue failure mechanism
b) High temperature creep
c) Low-cycle, high stress fatigue
d) Brittle fracture
D
4.2.7.3 a) Hydrogen stress cracking is a form of environmental cracking that can initiate on the surface of high strength low alloy steels and carbon steels with highly localized zones of high hardness in the weld metal and HAZ as a result of exposure to aqueous HF acid environments.
Prevent ion is best done by:
a) PWHT of carbon steel welds
b) low-strength carbon steels used in refinery applications should be controlled to produce weld hardness < 200 HB
c) using carbon steels with carbon equivalents (CE) less than 0.43 using the appropriate
equation
d) all of the above
D
5.1.2.4.6
The existence of 885°F embrit tlement can be identified by:
a) A decrease in h ardness in affected areas
b) Failure during bend testing or impact testing of samples removed from service
c) In-situ metallographic examination
d) Both a and b
B
4.2.5.5
In general, th e sulfidation resistance of iron and nickel base alloys is determined by which
alloying element?
a ) chromium
b) nickel
c) titanium
d) molybdenum
A
4.4.2.3 e)
Short term overheating can cause permanent deformation occurring at relatively low stress levels as a result oflocalized overheating. This usually results in:
a) bulging and eventually failure by stress rupture
b) bulging and eventually failure by brittle fracture
c) thermal fatigue
d) thermal craze cracking
A
4.2.10.1
Which materials exhibit an endurance limit below which fatigue cracking will not occur,
regardless of the number of cycles.
a) carbon steel
b) titanium
c) carbon steel and titanium
d) carbon steel, titanium and aluminum a lloys
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