Question 727 Deck Safety

70% to pass

When using the combustible gas indicator, a special filter for filtering the incoming sample must be used if the atmosphere being tested contains vapors of _______________.

A leaded gasoline
B CO2
C sour crude
D chlorine
AI Explanation

The correct answer is A) leaded gasoline. When using a combustible gas indicator, a special filter must be used if the atmosphere being tested contains vapors of leaded gasoline. This is because leaded gasoline contains tetraethyllead, which can damage or interfere with the operation of the combustible gas indicator. The special filter is required to remove these lead-containing vapors from the sample before it enters the instrument, ensuring accurate and reliable readings. The other options (B, C, and D) do not require the use of a special filter when using a combustible gas indicator, as they do not contain substances that can interfere with the instrument's operation.

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Official Resources
46 CFR Lifesaving Equipment USCG Marine Safety Center USCG National Maritime Center
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