The maximum allowable oxygen content within the ship's cargo tanks, inert gas piping and the vapor recovery system is __________.
Official USCG Answer & Rule Citation
Correct Answer: Option C — 8%
Under 46 CFR 32.53 and SOLAS Chapter II-2, the maximum allowable oxygen content in the inert gas main and cargo tanks must not exceed 8% by volume. This limit provides a safe margin below the minimum oxygen concentration required to support combustion.
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