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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:

Akeeping temperature below the maximum of 250F (120C).

Buse of 300 series stainless steels.

Cproper design.

Dacid injection to balance pH.

Show Suggested 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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Kimi

1 day ago

Definitely agree with option C!

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Shaun

6 days ago

Proper design is key to preventing caustic corrosion.

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Magdalene

12 days 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

2 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

2 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

2 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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