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api 571 for api 510/570 ( Caustic stress corrosion cracking)
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Caustic Embrittlement can cause cracks that normally initiate:
on the surface adjacent to welds
Which alloys are more resistant to Caustic Stress Corrosion Cracking?
A) Chromes
B) Nickels
C) Ferrites
D) Sulfides
B) Nickels
Which of the following is not a factor in the Caustic Stress Corrosion Cracking?
A) Temp
B) Time
C) Stress
D) Caustic strenght
E) Material
B) Time
In a caustic system, which of the following if improperly designed can contribute to Caustic Stress Corrosion Cracking?
A) Reducers
B) Nozzles
C) Heat tracing
D) Flanges
C) Heat tracing
Which of the following is a common way that Operations causes Caustic Stress Corrosion Cracking?
A) Lowering the pH
B) Steam cleaning
C) Increasing flow rate
D) Overpressure
B) Steam cleaning
The likelihood of Caustic Stress Corrosion Cracking can be reduced by:
Stress-relieving
A CS caustic system has a 10% concentration of NaOH(caustic. Above what temp is stress-relieving recommended?
176°F
A CS caustic system has a 30% concentration of NaOH(caustic). Above what temp is stress-relieving recommended?
140°F
A CS caustic system has a 10% concentration of NaOH(caustic). Above what temp is stress relieving no longer effective?
220°F
A caustic system has a 30% concentration of NaOH(caustic). Above what temp are nickel alloys recommended?
205°F
Author
egf4201
ID
303828
Card Set
api 571 for api 510/570 ( Caustic stress corrosion cracking)
Description
api 571 for api 510/570 ( Caustic stress corrosion cracking)
Updated
2015-11-19T16:07:40Z
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