Engineering · Auxiliary — Heat Exchangers
Zinc anodes are fitted in seawater-cooled heat exchangers to:
- AImprove heat transfer
- BProvide sacrificial protection against galvanic corrosion✓ Correct
- CFilter the seawater
- DIncrease flow velocity
Explanation
Zinc (sacrificial) anodes corrode preferentially, protecting the more noble cooler tubes and end bells from galvanic attack. They are inspected and renewed on a schedule.
Authority: Auxiliary Machinery (USCG engineering topic)
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