API 570 - Closed Book Combined Exam Set Questions With Revised Correct Detailed Answers
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Course
API 570
Institution
API 570
API 570 - Closed Book Combined
Exam Set Questions With Revised
Correct Detailed Answers
1) Which of the following NDE techniques can be effective in
detecting and sizing Caustic Stress Corrosion Cracks? - API 571
UT angle-beam
2) A carbon steel caustic system has a 10% concentration...
API 570 - Closed Book Combined
Exam Set Questions With Revised
Correct Detailed Answers
1) Which of the following NDE techniques can be effective in
detecting and sizing Caustic Stress Corrosion Cracks? - API 571
ANSWER UT angle-beam
2) A carbon steel caustic system has a 10% concentration of NaOH
(Caustic). Above what temperature is stress-relieving
recommended? - API 571
ANSWER 176 °F
3) A carbon steel caustic system has a 30% concentration of NaOH
(caustic). Above what temperature is stress-relieving
recommended? - API 571
ANSWER 140 °F
4) A carbon steel caustic system has a 10% concentration of NaOH
(caustic). above what temperature is stress-relieving no longer
effective? - API 571
ANSWER 220 °F
, 5) A caustic system has a 30% concentration of NaOH (caustic).
Above what temperature are nickel alloys recommended? - API
571
ANSWER 207 °F
6) Chloride Stress corrosion cracking (Chloride SCC) can cause cracks
that normally initiate: - API 571
ANSWER On the surface of 300 Series SS
7) Which of the following is Not a factor in the chloride SCC? - API
571
ANSWER Pressure
8) Which of the following can contribute to chloride SCC? - API 571
ANSWER Dissolved Oxygen
9) Heat transfer equipment can provide a way for chlorides to: - API
571
ANSWER concentrate
10) Chloride SCC usually occurs at temperatures above: - API
571
ANSWER 140 °F
11) Chloride SCC usually occurs at a pH: - API 571
ANSWER above 2 pH.
12) which of the following components is most likely to crack
from chloride SCC in a chloride environment? - API 571
ANSWER Expansion bellows
,Nickel alloys have the greatest susceptibility to Chloride Stress
Corrosion Cracking when the nickel content is between: - API 571
ANSWER Between 8% to 12%.
Nickel is highly resistant to Chloride SCC when the nickel content in the
alloy is above: - API 571
ANSWER 35%
Which of the following are common places where chloride SCC has
been known to occur? - API 571
ANSWER Crude Tower Overhead Condenser, Boiler Drain Lines
External Chloride SCC has been caused by Chlorides in: - API 571
ANSWER Wet Insulation.
The fracture surfaces from Chloride SCC have a(n): - API 571
ANSWER Brittle appearance.
when insulating 300 SS equipment which of the following steps are
important? - API 571
ANSWER Add a coating to the equipment prior to insulating.
Which of the following NDE methods is the LEAST useful in detecting
Chloride Stress Corrosion Cracking - API 571
ANSWER RT
CUI is caused by: - API 571
Water trapped under insulation or fireproofing.
Concerning CUI which of the following are true? - API 571
ANSWER Corrosion rate increases as temperature increases up to
where water rapidly vaporizes
, CUI is a possibility on insulated Carbon Steel equipment that operates
between: - API 571
ANSWER 10 to 350 °F
CUI is a possibility on insulated Austenitic 300 Series SS equipment that
operates between: - API 571
ANSWER 140 to 350 °F
CUI is a possibility on insulated Duplex SS equipment that operates
between: - API 571
ANSWER 280 to 350 °F
CUI is a possibility on insulated 400 Series SS equipment that operates
between: - API 571
ANSWER 10 to 350 °F
CUI occuring on 300 Series and Duplex SS equipment actually is caused
by what type of corrosion mechanism? - API 571
ANSWER Chloride Stress Corrosion Cracking
CUI is an inspection concern for insulated vessels that operate at 500 °F
and: - API 571
ANSWER is in an intermittent service.
Which of the following insulated equipment is most likely to experience
CUI? - API 571
CS vessel with operating temp at 600 °F but is in an intermittent
service.
CUI can be more aggressive when: - API 571
Chlorides leach out of the insulation
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