5/22/2021 API 571 Study Guide-Practice Questions for API 570 Exam- Corrosion Under Insulation - CUI (4.3.
ation - CUI (4.3.3) Flashcards | Quizlet
API 571 Study Guide-Practice Questions for API 570
Exam- Corrosion Under Insulation - CUI (4.3.3)
Terms in this set (12)
CUI is an inspection B
concern for insulated
carbon steel equipment
that operates between:
A. 0 to 100 degree F
B. 10 to 350 degree F
C. 25 to 250 degree F
D. 50 to 125 degree F
E. 140 to 400 degree F
CUI is an inspection D
concern for insulated
austenitic stainless steel
equipment that
operates between:
A. 10 to 350 degree F
B. 25 to 250 degree F
C. 50 to 125 degree F
D. 140 to 400 degree F
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5/22/2021 API 571 Study Guide-Practice Questions for API 570 Exam- Corrosion Under Insulation - CUI (4.3.3) Flashcards | Quizlet
CUI is an inspection A
concern for insulated
vessel that operates at
500 degree F and :
A. Is in intermittent
service.
B. Is made of stainless
steel.
C. Is made of low
chromes.
D. Have poorly
maintained insulation.
Which of the following A
insulated equipment is
most likely to
experience CUI?
A. CS vessel with
operating temperature
of 600 degree F but is in
an intermittent service.
B. CS vessel that
operates continuously
at 375 degree F
C. CS vessel that
operates continuously
at -20 degree F
D. CS vessel that
operates at cyclic
temperature ranging
between 375-600
degree F
E. SS Vessel that
operated continuously
at 100571
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5/22/2021 API 571 Study Guide-Practice Questions for API 570 Exam- Corrosion Under Insulation - CUI (4.3.3) Flashcards | Quizlet
CUI is most severe C
when metal
temperatures are
between:
A. 10 to 350 degree F
B. 25 to 250 degree F
C. 212 to 350 degree F
D. 140 to 400 degree F
If the metal temperature B
increases, while still in
the CUI temperature
range, the corrosion
rate:
A. Will decrease.
B. Will increase.
C. Will remain constant.
D. May increase or
decrease depending on
the operation process.
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5/22/2021 API 571 Study Guide-Practice Questions for API 570 Exam- Corrosion Under Insulation - CUI (4.3.3) Flashcards | Quizlet
Which of the following D
is not a common
location of CUI on
piping?
A. Bolted on pipe
shoes.
B. First few feet of
horizontal pipe
attached to a bottom of
a vertical pipe run.
C. Insulation
terminations.
D. Piping spec breaks.
E. Steam tracing tubing
penetrations.
CUI on carbon steel or D
low alloy materials
appears as:
A. Cracking
B. General wall loss.
C. Localized wall loss.
D. Localized pitted or
localized wall loss.
CUI on 300 Series E
stainless steel materials
appears as:
A. Cracking
B. General wall loss.
C. Localized pitting.
D. Cracking or localized
pitting or localized wall
loss.
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5/22/2021 API 571 Study Guide-Practice Questions for API 570 Exam- Corrosion Under Insulation - CUI (4.3.3) Flashcards | Quizlet
What causes the CUI A
cracking on 300 series
stainless steel
materials?
A. Chlorides
B. Hydrogen
C. Nitrates
D. Sulfates
E. Kryptonite
Which of the following D
is not a method to
prevent CUI?
A. Flame sprayed
alumimum coatings.
B. Non-metallic
coatings.
C. Use of closed-cell
foam glass insulations.
D. Wishful thinking.
Which of the following C
is not a method to
inspect for CUI?
A. De-insulate and
Visual Inspection
B. Guided wave UT
C. MFL
D. Neutron backscatter
E. Real-time profile RT
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