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API-571 Exam - Topic 2 Question 126 Discussion

(Cooling water corrosion usually increases with decreasing:)
D) Velocities
A) Microbiological activity
B) Oxygen content
C) Process temperatures

API-571 Exam - Topic 2 Question 126 Discussion

Actual exam question for API's API-571 exam
Question #: 126
Topic #: 2
[All API-571 Questions]

(Cooling water corrosion usually increases with decreasing:)

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Suggested Answer: D

Comprehensive and Detailed Explanation From Exact Extract:

According to API RP 571, corrosion in cooling water systems often increases at low flow velocities due to:

Stagnation

Deposit formation

Increased risk of underdeposit corrosion and MIC

Higher velocities tend to:

Sweep away deposits

Maintain protective films (within erosion limits)

Therefore, decreasing velocity is strongly associated with increased corrosion risk.

Referenced Documents (Study Basis):

API RP 571 -- Section on Cooling Water Corrosion


by Tom at May 28, 2026, 10:20 PM

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Timothy
1 day ago
I’m a bit confused. I thought lower temperatures would generally reduce corrosion, but I can’t remember if that applies here.
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Jaime
6 days ago
I feel like we discussed how increasing velocities can help reduce corrosion, so maybe D) Velocities is the answer?
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Georgene
12 days ago
I think it might be B) Oxygen content, but I’m not entirely sure. I remember something about oxygen being a key factor in corrosion.
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