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API-571 Exam - Topic 1 Question 124 Discussion

In steam-generating equipment, caustic corrosion is best prevented through:
B) use of 300 series stainless steels.
A) keeping temperature below the maximum of 250F (120C).
C) proper design.
D) acid injection to balance pH.

API-571 Exam - Topic 1 Question 124 Discussion

Actual exam question for API's API-571 exam
Question #: 124
Topic #: 1
[All API-571 Questions]

In steam-generating equipment, caustic corrosion is best prevented through:

Show Suggested Answer Hide Answer
Suggested Answer: B

From API RP 571 Section 5.3.3.2 (Caustic Corrosion):

''Caustic corrosion, also known as caustic gouging, occurs in boiler systems when caustic concentrates in under-deposit areas or due to improper steam drum and boiler water design. Good design and water treatment practices are key preventive measures.''

Temperature control or acid injection are not practical or effective mitigation techniques. Design considerations---such as proper water flow, material selection, and minimizing deposits---are essential.

Hence, the correct answer is Option C.


by Jamie at May 02, 2026, 09:31 PM

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Mitsue
I lean towards C as well. Design can prevent many issues.
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Louvenia
5 days ago
Keeping temp below 250F is also important.
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Sueann
10 days ago
True, but design impacts everything.
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Elroy
15 days ago
But what about the materials? 300 series stainless steels are good too.
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Adolph
21 days ago
Agreed, C is the best choice.
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Paulina
26 days ago
I think proper design is key.
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Rory
1 month ago
Not sure about keeping temps below 250F, seems too low for some systems.
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Tu
1 month ago
300 series stainless steels are a solid choice too.
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Elouise
1 month ago
Wait, acid injection? That sounds risky.
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Kimi
2 months ago
Definitely agree with option C!
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Shaun
2 months ago
Proper design is key to preventing caustic corrosion.
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Magdalene
2 months ago
Acid injection sounds familiar, but I thought it was more about balancing pH in general rather than specifically preventing caustic corrosion.
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Jamal
3 months ago
I vaguely remember that keeping temperatures low can help, but I don't know if 250F is the right threshold for this type of corrosion.
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Loise
4 months ago
I feel like we discussed the use of 300 series stainless steels in class, but I can't recall if they were specifically for caustic corrosion or something else.
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Marge
4 months ago
I think I remember something about proper design being crucial for preventing caustic corrosion, but I'm not entirely sure if that's the best option here.
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